Oregon Corporate Activity Tax (CAT)

Description

Oregon Corporate Activity Tax is a gross receipts tax (not an income tax) imposed under ORS Chapter 317A on persons with Oregon commercial activity. The tax equals $250 plus 0.57% of taxable commercial activity above $1 million, after a subtraction of 35% of the greater of Oregon-apportioned cost of goods sold or Oregon-apportioned labor costs. Market-based sourcing applies. Registration is required at $750,000 of Oregon commercial activity. Quarterly estimated payments are due; annual return (Form OR-CAT) is due April 15. Grocery sales are excluded. Tax year 2025.

1. Scope and statutory authority

1.1 Statutory citation

The Oregon Corporate Activity Tax is codified at ORS Chapter 317A, enacted by House Bill 3427 in the 2019 regular session of the Oregon Legislative Assembly and amended materially by House Bill 2164 (2019) and Senate Bill 164 (2021). The tax took effect January 1, 2020. Implementing administrative rules are issued by the Oregon Department of Revenue and codified at OAR Chapter 150, Division 317.

The tax is sometimes referred to by the Department of Revenue as the "Commercial Activity Tax" or simply "CAT," and the colloquial usage tracks the statutory short title in ORS 317A.100(1).

1.2 What CAT is — and is not

CAT is a privilege tax for the privilege of doing business in Oregon, measured by Oregon commercial activity. Three points must be held in mind throughout this skill:

1. CAT is a gross receipts tax, not an income tax. The taxpayer pays whether or not the business is profitable.
2. CAT is in addition to Oregon corporate excise tax (ORS Chapter 317) and Oregon corporate income tax (ORS Chapter 318) — a C-corporation doing business in Oregon may pay both CAT and the corporate excise tax on the same revenue stream, because they have different bases.
3. CAT is not a sales tax. The tax is imposed on the seller. Sellers may include the tax in their pricing but Oregon law does not require or prohibit pass-through; there is no separately stated "CAT charge" mechanism in statute analogous to a sales tax line item.

1.3 Scope of this skill

This skill covers CAT for all standard taxpayer types (sole proprietors, single-member LLCs, partnerships, S-corporations, C-corporations, LLCs taxed as partnerships, and unitary groups) operating in or selling into Oregon for tax year 2025. The following items are explicitly out of scope and routed to the refusal catalogue at section 13:

• CAT for financial institutions subject to the special apportionment rules under ORS 317A.106
• CAT for insurance companies under ORS 731.804 (insurance gross-premium tax interaction)
• CAT for agricultural cooperatives under ORS 317A.100(4)(c)
• CAT for hospitals, long-term care facilities, and other healthcare entities with statutory exclusions
• Pre-2020 transition issues
• Refund claims older than the statute of limitations
• Audits in progress (deferred to credentialed Oregon CPA or attorney)

1.4 Who must read this skill

Read this skill before doing any of the following:

• Determining whether an Oregon registration is required
• Computing a CAT estimated payment
• Preparing Form OR-CAT
• Advising on whether to elect unitary group filing
• Evaluating the CAT impact of a multi-state structure where Oregon is one of several sourcing states

2. Tax base — Oregon commercial activity

2.1 Definition of commercial activity

"Commercial activity" is defined at ORS 317A.100(1)(a) as the total amount realized by a person, arising from transactions and activity in the regular course of the person's trade or business, without deduction for expenses incurred by the trade or business.

The statute uses "total amount realized" — not "gross income" and not "gross receipts as reported on federal Schedule C line 1." The "total amount realized" concept tracks the §1001 realization concept under federal law but is applied without the federal deductions for cost basis or expenses. As a result, the Oregon commercial activity base can be larger than the corresponding federal Schedule C gross receipts figure for the same business — particularly where the federal return reports net of returns, allowances, or COGS at the top.

2.2 Items included in commercial activity

Commercial activity generally includes:

• Gross receipts from sales of goods (without reduction for returns or allowances at the top line — those are addressed via the §317A.100(1)(b) exclusions, not at the base)
• Gross receipts from services rendered (without reduction for refunds)
• Royalties from licensing intellectual property used in Oregon
• Rents from real property situated in Oregon (subject to specific carve-outs for residential rentals — see 2.3)
• Receipts from the sale or licensing of digital products delivered to Oregon
• Receipts from subscriptions and recurring SaaS revenue allocable to Oregon under the market-based sourcing rules in section 7
• Receipts from contract manufacturing performed in Oregon

2.3 Items excluded from commercial activity

ORS 317A.100(1)(b) lists more than 40 specific exclusions from commercial activity. The most commonly applicable ones for the typical Accora client base are:

1. Receipts from sales of groceries — both wholesale and retail. Added by Senate Bill 164 (2021), effective for tax years beginning on or after January 1, 2021. "Grocery" is defined by cross-reference to the federal SNAP-eligible food definition under 7 U.S.C. §2012(k), excluding prepared hot foods, alcohol, tobacco, and pet food. This is the single most consequential exclusion for Oregon retailers and is the source of significant classification work.

2. Receipts from the sale of motor vehicle fuel subject to the motor vehicle fuel tax under ORS Chapter 319. Diesel, gasoline, aviation fuel, and other motor fuels separately taxed at the pump are excluded from the CAT base to avoid pyramiding.

3. Receipts from the sale of fixed assets used in the trade or business — this captures equipment dispositions, real estate sales by an operating business (the sale of an office building used by the business), and similar non-recurring receipts. Note that this exclusion is for receipts from the sale of business assets, not inventory.

4. Dividends, interest, and capital contributions received by the taxpayer. This treats CAT consistently with its character as a tax on trading activity rather than passive investment.

5. Receipts from intercompany transactions within a unitary group that has elected combined filing under section 8.

6. Receipts from the wholesale or retail sale of liquid fuel for use in a motor vehicle, as referenced in item 2.

7. Receipts that the U.S. Constitution or federal statute prohibits Oregon from taxing. This includes receipts protected by P.L. 86-272 to the extent that statute applies, certain federally-preempted transactions (interstate commerce in articles preempted by federal regulation), and similar items.

8. Receipts from the sale of agricultural commodities by an agricultural cooperative under ORS 317A.100(4)(c).

9. Damages received from a lawsuit (compensatory, not punitive, where punitive damages are commercial in character).

10. Insurance proceeds unless they represent business interruption coverage for lost gross receipts (which is treated as ordinary commercial activity).

11. Receipts of the federal government, the State of Oregon, any political subdivision, and certain federally tax-exempt organizations in their non-commercial activity. A 501(c)(3) running an unrelated trade or business is treated like any other taxpayer with respect to the UBI receipts.

12. Receipts from the sale of a vehicle, vessel, or aircraft by a person not in the business of selling them — but a dealer's normal-course sales are commercial activity.

The full statutory exclusion list runs to 40+ items. Practitioners must check the current statutory text and the Department of Revenue's Form OR-CAT instructions for the complete list when a borderline receipt is at issue.

2.4 The grocery exclusion in practice

The grocery exclusion under SB 164 is operationally complex because most retailers do not sell exclusively groceries. A convenience store, for example, may sell SNAP-eligible food, prepared hot food (not excluded), alcohol (not excluded), tobacco (not excluded), and motor fuel (separately excluded). The taxpayer must separately track each line and exclude only the grocery-qualifying portion.

For a wholesale grocery distributor whose entire business consists of SNAP-eligible food, the exclusion may zero out the CAT base entirely, leaving only the $250 minimum tax — and even that is owed only if the taxpayer remains over the $1 million threshold after applying the exclusion. If the post-exclusion base is below $1 million, no CAT is due (subject to the registration question in section 4).

2.5 Returns and allowances

Returns and allowances are not separately listed in the statutory exclusions, but the "total amount realized" formulation effectively reduces the base by genuine returns because the taxpayer never realized the receipt in the first place — the sale was undone. Refunds of services, however, must be examined carefully because the original receipt was realized when paid and a later refund is treated as a reduction in commercial activity in the year of refund, not retroactively.

The Department of Revenue's position is that bona fide returns processed within the same reporting period reduce commercial activity. Returns processed in a later period are deducted in that later period.

3. Rate structure and the $1 million threshold

3.1 The two-part rate

The CAT computation has two components:

1. A flat $250 minimum tax owed by any taxpayer whose Oregon commercial activity exceeds $1,000,000 in the calendar year, and
2. A 0.57% (57 basis points) variable component applied to Oregon commercial activity in excess of $1,000,000, after the subtraction in section 5.

The formula is:

CAT = $250 + 0.57% × max(0, (Oregon commercial activity − $1,000,000 − 35%-subtraction))

The $250 is not a credit against the variable component; it is an additional flat amount owed once the threshold is crossed.

3.2 The exclusion threshold

If Oregon commercial activity does not exceed $1,000,000 in the calendar year, no CAT is due. ORS 317A.116. The $1 million figure is a true exclusion (not a deduction): it removes the first $1 million from the base of the variable component, and the $250 flat is owed only when the threshold is exceeded.

3.3 The $750,000 registration threshold

Oregon imposes a separate registration obligation under ORS 317A.131 for any person whose Oregon commercial activity exceeds $750,000 in the calendar year, even if no tax is ultimately due. Registration must be completed within 30 days of crossing the threshold.

The interaction of the two thresholds creates three regimes:

Oregon commercial activity	Registration	Return	Tax owed
Under $750,000	Not required	Not required	$0
$750,000 to $1,000,000	Required	Required if registered	$0
Over $1,000,000	Required	Required	$250 + 0.57% of base

A taxpayer in the middle band — between $750k and $1M — must register, must file the annual return, and will owe $0 in tax. Failure to register in this band is the most common error and triggers a separate registration penalty under ORS 317A.161.

3.4 What "Oregon commercial activity" means for the threshold

For purposes of both thresholds, "Oregon commercial activity" means commercial activity sourced to Oregon under the market-based sourcing rules in section 7. A California-headquartered SaaS company with $5 million of total commercial activity but only $400,000 sourced to Oregon does not need to register and owes no CAT.

For unitary groups that have elected combined filing, the threshold is applied at the group level, not the entity level. See section 8.

4. Bright-line nexus

4.1 Statutory nexus standard

ORS 317A.116 establishes a bright-line nexus standard for CAT that mirrors the multistate Tax Commission's factor-presence nexus framework. A person has substantial nexus with Oregon — and is therefore a "taxpayer" subject to CAT — if any of the following is satisfied during the calendar year:

1. The person has more than $750,000 of Oregon commercial activity (the same threshold that triggers the registration obligation under section 3.3),
2. The person has more than $50,000 of Oregon property,
3. The person has more than $50,000 of Oregon payroll, or
4. More than 25% of total property, payroll, or sales is in Oregon, or
5. The person is organized or commercially domiciled in Oregon (regardless of any factor threshold).

Any single factor being satisfied creates nexus. The bright-line approach means that out-of-state taxpayers cannot avoid CAT by arguing that they have no physical presence in Oregon — the economic-presence standard upheld by South Dakota v. Wayfair, Inc., 138 S.Ct. 2080 (2018) for sales tax applies a fortiori to CAT.

4.2 Property factor

Oregon property under the nexus test includes owned and rented real and tangible personal property situated in Oregon during the year. Rented property is valued at 8 times the net annual rental rate, consistent with the standard Uniform Division of Income for Tax Purposes Act ("UDITPA") convention.

4.3 Payroll factor

Oregon payroll includes wages, salaries, commissions, and other compensation paid to employees with Oregon as their place of work. The $50,000 threshold is exceeded quickly even by businesses with only one Oregon-resident remote worker earning more than $50,000 annually.

4.4 Sales factor

The "25% of sales" prong references sales of any kind, sourced under the market-based sourcing rules of section 7. A small business with most of its customers in Oregon — even if total commercial activity is below $750,000 — can establish nexus this way, but in practice the $750,000 commercial-activity prong is the binding constraint for almost all taxpayers.

4.5 Constitutional nexus

The Oregon Supreme Court considered a constitutional challenge to CAT in Santa Fe Natural Tobacco Co. v. Department of Revenue, 313 P.3d 1106 (Or. 2013) — an opinion that pre-dates CAT but is foundational for Oregon's tax-nexus doctrine — and the CAT statute itself withstood early constitutional challenges in administrative-rule litigation. The bright-line thresholds were designed to be conservative with respect to the Commerce Clause's substantial-nexus requirement post-Wayfair, and no successful constitutional challenge to CAT has been sustained as of this writing.

5. The 35% subtraction

5.1 Structure of the subtraction

ORS 317A.119 provides a subtraction from commercial activity equal to 35% of the greater of:

(a) the taxpayer's cost inputs, defined as cost of goods sold (COGS) computed in accordance with IRC §471 and the consolidated regulations thereunder, apportioned to Oregon, or

(b) the taxpayer's labor costs, defined as total compensation paid (capped at $500,000 per employee), apportioned to Oregon.

The taxpayer chooses (a) or (b), and the choice is made annually on the return — the taxpayer takes the higher of the two computed amounts, so the formula is:

Subtraction = 35% × max(Oregon-apportioned COGS, Oregon-apportioned labor)

5.2 Cost of goods sold prong

COGS for CAT purposes is computed under IRC §471 — the federal inventory rules — and is therefore the same figure the taxpayer reports on the federal return at line 8 of Form 1125-A (or equivalent line on a Schedule C). The COGS figure is then apportioned to Oregon using the same single-sales-factor apportionment formula that applies to the corporate excise tax under ORS 314.665.

For a single-state Oregon retailer with 100% of its sales sourced to Oregon, the apportionment factor is 1.0 and the entire COGS figure flows into the subtraction calculation. For a multi-state seller, only the Oregon-sourced portion of COGS — computed as total COGS times the Oregon sales factor — feeds into the subtraction.

5.3 Labor cost prong

Labor cost is defined as the total compensation paid by the taxpayer to its employees, capped at $500,000 per employee per year. The $500,000 cap is intended to prevent the labor subtraction from giving a disproportionate benefit to firms with a small number of very highly-compensated employees (think investment-banking partnerships or specialized professional firms).

Labor cost includes:

• W-2 wages
• The taxpayer's share of payroll taxes paid (Social Security, Medicare, federal and state unemployment)
• Employer contributions to retirement plans
• Employer-paid health insurance premiums
• Other fringe benefits that are deductible as compensation expense for federal income tax purposes

Labor cost does not include:

• Payments to independent contractors (the contractor reports its own commercial activity)
• Officer salaries to the extent treated as distributions for federal purposes
• Compensation in excess of $500,000 per employee

Labor cost is apportioned to Oregon under the same sales factor used for COGS — not under a payroll-factor allocation. This is a quirk of the statute: even though the labor subtraction is rooted in payroll expense, the apportionment to Oregon is done by the sales factor.

5.4 The choice between COGS and labor

Service businesses and SaaS companies typically have very low COGS and very high labor cost — for them, the labor prong is materially larger. Retailers, distributors, and manufacturers typically have very high COGS — for them, the COGS prong dominates.

A reasonable practitioner runs both calculations for each client and elects the larger. The election is made annually on the return; there is no carryover or cross-year binding effect.

5.5 Limitation: subtraction cannot exceed 95% of commercial activity

ORS 317A.119(3) limits the subtraction to 95% of Oregon commercial activity. This is a backstop to prevent the subtraction from completely eliminating the tax base for a taxpayer with abnormally high COGS or labor relative to revenue (a startup operating at a loss, for example, where labor exceeds revenue).

In practice, this limit binds only for taxpayers with deeply negative operating margins. For most clients, the subtraction is well below the 95% cap.

5.6 Subtraction formula putting it together

The full CAT calculation is:

Step 1: Determine Oregon commercial activity (OCA)
Step 2: Compute Oregon-apportioned COGS or labor, take the larger
Step 3: Multiply by 35% — this is the subtraction (capped at 95% × OCA)
Step 4: Tax base = max(0, OCA − $1,000,000 − Subtraction)
Step 5: CAT = $250 + 0.57% × Tax base   (only if OCA > $1,000,000)

6. Reporting period and filing mechanics

6.1 Calendar year

All CAT taxpayers report on a calendar-year basis under ORS 317A.137, regardless of the taxpayer's federal fiscal year. A C-corporation with a March 31 federal fiscal year-end still files Form OR-CAT for the calendar year ending December 31. This is one of the most common procedural surprises for out-of-state taxpayers.

6.2 Annual return

The annual return is Form OR-CAT, due April 15 following the close of the calendar year. The return is filed with the Oregon Department of Revenue, either electronically through Revenue Online or by paper for taxpayers who qualify for paper filing.

A six-month extension is available by filing Form OR-CAT-EXT by April 15 (the same date as the unextended return). The extension is for filing only — the tax must still be paid by April 15 to avoid penalty.

6.3 Quarterly estimated payments

Taxpayers with an annual CAT liability of $5,000 or more (other than the flat $250 minimum) must make quarterly estimated payments under ORS 317A.140. The four quarterly due dates are:

Quarter	Period	Estimated payment due
Q1	January 1 – March 31	April 30
Q2	April 1 – June 30	July 31
Q3	July 1 – September 30	October 31
Q4	October 1 – December 31	January 31 of following year

Each quarterly payment must equal 25% of the projected annual CAT liability. Underpayment is penalized under section 10.

6.4 Safe harbor for first-year filers

A first-year CAT taxpayer (one not subject to CAT in the prior year) is not subject to the underpayment penalty for the first year, provided the full annual liability is paid by April 15 with the return. This is a one-time grace; in year two, the standard quarterly estimated-payment regime applies.

6.5 Recordkeeping

CAT records must be retained for at least six years from the date the return is filed or the date the return is due, whichever is later. ORS 317A.158. This is longer than the typical federal three-year recordkeeping period and reflects the longer audit window for CAT.

7. Sourcing — market-based

7.1 General rule

Oregon applies market-based sourcing under ORS 317A.128 for purposes of determining whether commercial activity is "Oregon commercial activity." The general rule is:

• Tangible personal property is sourced to the location where the property is delivered to the purchaser (ship-to address).
• Services are sourced to the location where the customer receives the benefit of the service.
• Intangibles are sourced to the location where the intangible is used.
• Real property receipts (rents, gains) are sourced to the location of the property.

7.2 Tangible personal property — ship-to rule

For sales of goods, sourcing follows the destination of delivery. A widget shipped from a California warehouse to a customer in Portland, Oregon, is Oregon commercial activity regardless of where the seller is headquartered, where title transferred, or where the order was placed.

Drop-ship transactions are sourced to the ultimate Oregon destination — the location of the actual customer, not the intermediate party. This is consistent with the underlying economic-substance principle of CAT.

7.3 Services — benefit-of-the-service rule

For services, Oregon applies the "where the benefit is received" rule. This is operationally identical to the rule in many other market-based-sourcing states (California, Massachusetts, Texas franchise tax) and the practitioner literature is consistent: the test asks where the customer ultimately enjoys the result of the service.

For professional services to a business customer (B2B), the benefit is generally received at the customer's place of business — typically the office where the engagement is administered, not the customer's place of incorporation.

For consumer services (B2C), the benefit is generally received where the consumer is located — usually their state of residence.

For SaaS and cloud services, the practitioner consensus and Department of Revenue practice is that the benefit is received where the end users access the software. For business customers, that means Oregon-based users count toward Oregon commercial activity, prorated by user count if necessary.

7.4 Intangibles

Royalties and licensing receipts from intellectual property are sourced to where the licensee uses the IP. A Delaware-based licensor of a trademark used by a Portland retailer has Oregon commercial activity equal to the royalty paid by the Portland retailer.

7.5 The "reasonable approximation" fallback

ORS 317A.128(2) provides that if the sourcing rules cannot be applied with reasonable accuracy — for example, where a SaaS company cannot determine the actual location of end users — the taxpayer must use a "reasonable approximation" based on a method that fairly represents the location of the customer's benefit. Common approximations:

• For B2B SaaS: proration by billing address, then by user count if billing address is HQ
• For digital advertising: proration by IP-address geolocation of viewers
• For cloud storage: proration by the location of the primary administrator account

The reasonable-approximation method must be applied consistently year-over-year and documented in the taxpayer's workpapers.

8. Combined and consolidated group filing

8.1 Statutory framework

ORS 317A.106 permits and in some cases requires combined filing for unitary groups. A "unitary group" is defined by reference to the federal consolidated-return rules under IRC §1504 with modifications, but the unitary determination under Oregon law is broader than the federal affiliated-group test:

• For a unitary group with 50% or more common ownership (under the Oregon unitary test, which examines centralized management, flow of value, and economic interdependence), the group must file as a combined group for CAT.
• For affiliated entities that are not unitary, the group may elect to file as a combined group, with the election made on the return for the year of first eligibility and binding for subsequent years (subject to permission to revoke).

8.2 Effect of combined filing

When a combined group files, the following consequences attach:

• Intercompany transactions among group members are eliminated from commercial activity (see exclusion item 5 in section 2.3).
• The $1 million exclusion is applied once at the group level, not per entity. A combined group with three members each generating $700,000 of Oregon commercial activity has $2,100,000 of group commercial activity and pays CAT on $1,100,000 (less subtraction), not zero per entity.
• The $750,000 registration threshold is applied once at the group level.
• The 35% subtraction is computed on a combined basis — COGS and labor of all group members are aggregated.
• Tax liability is joint and several among group members.

8.3 Strategic considerations

Combined filing generally increases total CAT liability for a group of separately small entities (because the $1M exclusion is consolidated) but decreases it for a group with substantial intercompany sales (because those sales drop out). The decision should be modeled annually.

The unitary determination is fact-intensive. A holding company with truly arm's-length subsidiaries operating in different industries may not be unitary. A retail chain with separately incorporated locations sharing a common brand, common purchasing, and centralized back office is almost always unitary.

8.4 Designated reporter

A combined group must designate one member as the "designated reporter" — typically the corporate parent. The designated reporter files the single Form OR-CAT for the group, signs the return, and is the primary point of contact with the Department of Revenue. Other members are jointly and severally liable but do not file separate returns.

9. Interaction with Oregon corporate excise tax and other Oregon taxes

9.1 Corporate excise tax (ORS Chapter 317)

Oregon imposes a corporate excise tax on C-corporations doing business in Oregon under ORS Chapter 317, with a graduated rate of 6.6% on the first $1 million of Oregon taxable income and 7.6% on income above $1 million. The minimum tax is the larger of $150 or a graduated schedule based on Oregon sales (ranging from $150 for under $500k to $100,000 for $100M+ of Oregon sales).

CAT is in addition to the corporate excise tax. A C-corporation with Oregon operations may pay both:

• The corporate excise tax on net Oregon income at 6.6%/7.6%, AND
• CAT on Oregon commercial activity at 0.57% (after subtraction and threshold)

There is no credit between the two taxes. They have different bases (net income vs. gross receipts after subtraction) and different rate structures. CAT is deductible as a state tax for federal purposes; the corporate excise tax is also separately deductible.

9.2 Corporate income tax (ORS Chapter 318)

The corporate income tax under Chapter 318 applies to corporations not "doing business" in Oregon but with Oregon-source income (passive Oregon income for an out-of-state corporation that does not establish nexus under Chapter 317). The Chapter 318 rate is the same as the excise tax rate. The interaction with CAT mirrors section 9.1.

9.3 Personal income tax

Sole proprietors and pass-through entity owners report Oregon-source business income on their personal Oregon Form OR-40 (resident) or OR-40-N/OR-40-P (nonresident/part-year). CAT paid by the business reduces the federal Schedule C net income (CAT is deductible as a business tax under §164) and therefore indirectly reduces Oregon personal income tax. There is no direct credit.

9.4 Oregon Transit Self-Employment Tax

The Tri-Met and Lane Transit District self-employment taxes are separate from CAT and apply independently to self-employed individuals operating in those transit districts. No interaction with CAT — both are owed if applicable.

9.5 Multnomah County and Portland Metro business taxes

Multnomah County imposes a business income tax and Portland has a license fee, both administered jointly through the Portland Revenue Division. These are separate from CAT and from state corporate excise tax. A Portland-based business may have four separate Oregon-related state and local business tax filings: CAT, state corporate excise, Multnomah business income tax, and Portland license fee.

10. Penalties and interest

10.1 Late registration penalty

Failure to register within 30 days of crossing the $750,000 threshold is subject to a penalty of $100 per month, up to $1,000. ORS 317A.161. The penalty applies even when no CAT is ultimately due (i.e., even for a taxpayer in the $750k–$1M registration band).

10.2 Late filing penalty

A taxpayer who fails to file the annual Form OR-CAT by the due date (or extended due date) is subject to a penalty of 5% of the unpaid tax. ORS 317A.161.

10.3 Late payment penalty

The late payment penalty is 5% of the unpaid tax, plus an additional 20% if the return is filed more than 90 days late, for a combined late-payment-plus-late-filing maximum of 25% of the unpaid tax. This is layered on top of any underpayment-of-estimated-tax penalty under section 10.4.

10.4 Underpayment of estimated tax

If a taxpayer's quarterly estimated payments cumulatively cover less than 80% of the actual annual CAT liability, an underpayment penalty applies. The penalty is 5% of the underpaid amount per quarter.

10.5 Interest

Interest on unpaid CAT accrues from the date the tax was originally due at the rate set by the Department of Revenue annually under ORS 305.220. The rate is recalibrated each year and is typically 4–6 percentage points above the federal short-term rate. For 2025, the Department's rate is 8% per annum.

10.6 Fraud and substantial understatement

For fraudulent filings, the penalty is 100% of the unpaid tax. For substantial understatements (defined as the greater of 10% of correct tax or $10,000), the penalty is 20% of the understatement. These penalties are layered with interest but do not stack with the basic late-filing and late-payment penalties — the larger of the two applies.

11. Worked examples

11.1 Example 1 — Small Oregon retailer at $1.5 million with COGS

Facts. Cascade Hardware LLC is a single-member LLC owned by an Oregon resident. The LLC operates a brick-and-mortar hardware store in Bend, Oregon. For calendar year 2025, the LLC has:

• Oregon commercial activity (all sales to Oregon customers): $1,500,000
• Federal Form 1125-A cost of goods sold: $900,000
• Labor (W-2 wages plus employer payroll taxes plus health insurance): $200,000
• 100% of sales sourced to Oregon

Step 1 — Registration. Oregon commercial activity exceeds $750,000, so the LLC must be registered with the Oregon Department of Revenue. The LLC was already registered from prior years.

Step 2 — Determine the subtraction. Oregon-apportioned COGS is $900,000 (apportionment factor = 1.0). Oregon-apportioned labor is $200,000 (apportionment factor = 1.0). The taxpayer takes the larger: COGS at $900,000. The subtraction is 35% × $900,000 = $315,000.

Step 3 — Check the 95% cap. 95% × $1,500,000 = $1,425,000. The subtraction of $315,000 is well below the cap, so no limitation.

Step 4 — Compute tax base.

• Oregon commercial activity: $1,500,000
• Less exclusion: ($1,000,000)
• Less subtraction: ($315,000)
• Tax base: $185,000

Step 5 — Compute CAT.

• Flat amount: $250
• Variable: 0.57% × $185,000 = $1,054.50
• Total CAT: $1,304.50

Step 6 — Estimated payments. Because the annual liability is below $5,000, quarterly estimated payments are not required. The full amount is due with Form OR-CAT on April 15, 2026.

Step 7 — Federal interaction. The $1,304.50 of CAT is deductible as a state and local business tax on Cascade Hardware's Schedule C, reducing federal taxable income and Oregon personal income tax for the owner.

11.2 Example 2 — Services firm at $3 million with labor subtraction

Facts. Willamette Strategy Partners LLC is a multi-member LLC taxed as a partnership. It is a management-consulting firm with offices in Portland and Eugene. For calendar year 2025:

• Total commercial activity (worldwide): $3,500,000
• Oregon commercial activity (services rendered to Oregon-based clients, sourced to where the client receives the benefit): $3,000,000
• Cost of goods sold: $0 (services firm — no inventory)
• Total compensation paid: 18 employees, total compensation of $2,400,000, with one rainmaker partner earning $750,000 (capped at $500,000 for CAT purposes)
• Labor for CAT purposes: $2,400,000 − ($750,000 − $500,000) = $2,150,000
• Apportionment factor (Oregon sales ÷ total sales): $3,000,000 ÷ $3,500,000 = 0.8571
• Oregon-apportioned labor: $2,150,000 × 0.8571 = $1,842,857

Step 1 — Registration. Required.

Step 2 — Determine the subtraction. COGS = $0. Labor (Oregon-apportioned) = $1,842,857. Take the larger: labor at $1,842,857. Subtraction = 35% × $1,842,857 = $645,000 (rounded).

Step 3 — 95% cap. 95% × $3,000,000 = $2,850,000. Subtraction of $645,000 is well below the cap.

Step 4 — Tax base.

• Oregon commercial activity: $3,000,000
• Less exclusion: ($1,000,000)
• Less subtraction: ($645,000)
• Tax base: $1,355,000

Step 5 — Compute CAT.

• Flat: $250
• Variable: 0.57% × $1,355,000 = $7,723.50
• Total CAT: $7,973.50

Step 6 — Estimated payments. Annual liability exceeds $5,000, so quarterly estimated payments are required. Each quarterly payment should be approximately $1,994 (25% of $7,973.50). The first payment for 2025 was due April 30, 2025; subsequent payments July 31, October 31, and January 31, 2026.

Step 7 — Pass-through treatment. Because the LLC is taxed as a partnership, CAT is a partnership-level liability that reduces partnership net income flowing through on Schedule K-1 to the partners. Each partner separately reports their distributive share of Oregon-source income on their personal Oregon return.

11.3 Example 3 — Multi-state SaaS hitting Oregon nexus

Facts. PineCloud Inc. is a Delaware C-corporation headquartered in Austin, Texas, with no Oregon office, no Oregon employees, and no Oregon-owned property. PineCloud sells a B2B SaaS product (project management software) on annual subscriptions. For calendar year 2025:

• Total worldwide commercial activity: $25,000,000
• Approximately 8% of subscribers are Oregon-based, generating $1,950,000 of revenue from Oregon-domiciled customers
• The Oregon customer base is determined by billing address; the company has approximately 280 Oregon-domiciled paying customer organizations
• COGS for the SaaS business: $3,000,000 (hosting, third-party APIs, data infrastructure)
• Labor: $14,000,000 (250 employees, average $56,000 compensation; one CTO at $480,000 — under the cap)
• Oregon apportionment factor (sales factor): $1,950,000 ÷ $25,000,000 = 0.078

Step 1 — Nexus. Oregon commercial activity is $1,950,000, exceeding the $750,000 bright-line threshold under ORS 317A.116(1). PineCloud has substantial nexus and must register and file.

Step 2 — Registration. PineCloud must register with the Oregon Department of Revenue within 30 days of crossing the $750,000 threshold. If PineCloud only became aware of the Oregon obligation mid-year, registration should be effected immediately with disclosure of when the threshold was crossed.

Step 3 — Determine the subtraction.

• Oregon-apportioned COGS: $3,000,000 × 0.078 = $234,000
• Oregon-apportioned labor: $14,000,000 × 0.078 = $1,092,000
• The labor prong is larger. Subtraction = 35% × $1,092,000 = $382,200

Step 4 — 95% cap. 95% × $1,950,000 = $1,852,500. Subtraction of $382,200 is well below the cap.

Step 5 — Tax base.

• Oregon commercial activity: $1,950,000
• Less exclusion: ($1,000,000)
• Less subtraction: ($382,200)
• Tax base: $567,800

Step 6 — Compute CAT.

• Flat: $250
• Variable: 0.57% × $567,800 = $3,236.46
• Total CAT: $3,486.46

Step 7 — Estimated payments. Annual liability below $5,000 — quarterly estimated payments not strictly required, but PineCloud should prudently pay quarterly to stay within the 80% safe harbor in case 2026 commercial activity grows.

Step 8 — Interaction with Oregon corporate excise tax. PineCloud is also subject to Oregon corporate excise tax under ORS Chapter 317 if it has nexus for excise-tax purposes. Post-Wayfair, the Department's position is that economic nexus is sufficient for the excise tax as well, and the $1,950,000 of Oregon sales clearly exceeds the bright-line factor-presence sales threshold for excise tax (also $750,000). PineCloud will need to apportion its net income to Oregon under the single-sales-factor formula and pay corporate excise tax in addition to CAT.

Step 9 — Sourcing audit risk. The principal audit risk for PineCloud is the sourcing methodology: does "Oregon customer" mean billing address, or actual end-user location? For B2B SaaS where the customer is a multi-state enterprise, the Department of Revenue has accepted billing-address sourcing as a reasonable approximation under ORS 317A.128(2), but practitioners should document the methodology and apply it consistently. If a single large Oregon-billed customer has primarily California-based users, an alternative reasonable approximation (proration by user count) may be more accurate and should be considered.

12. Quick-reference summary

RATE:           $250 + 0.57% × tax base
TAX BASE:       max(0, OR commercial activity − $1M − 35%-subtraction)
SUBTRACTION:    35% × max(OR-apportioned COGS, OR-apportioned labor)
                (cap: 95% of OR commercial activity)
LABOR CAP:      $500,000 per employee
THRESHOLDS:     Register at $750,000; tax begins at $1,000,000
NEXUS:          $750k sales OR $50k property OR $50k payroll OR 25% factor
SOURCING:       Market-based (ship-to for goods; benefit-of-service for services)
ANNUAL FILING:  Form OR-CAT, due April 15 (calendar year)
QUARTERLY:      Apr 30, Jul 31, Oct 31, Jan 31 (if annual liability ≥ $5,000)
PENALTIES:      5%/month, max 25%; underpayment 5% if < 80% prepaid
COMBINED:       Required if unitary at 50%+ common ownership
EXCLUSIONS:     Groceries, motor fuel, fixed-asset sales, dividends, interest,
                capital contributions, intercompany within combined group
INTERACTION:    Pay BOTH CAT and OR corporate excise tax (different bases)

13. Refusal catalogue

Refuse to produce a CAT return or definitive CAT advice — and route to a credentialed Oregon CPA or tax attorney — in the following circumstances:

R-OR-CAT-1. Financial institutions subject to the special apportionment rules under ORS 317A.106. The financial-institution apportionment is meaningfully different (uses receipts factors specific to interest, fees, and loan servicing) and outside this skill's scope.

R-OR-CAT-2. Insurance companies subject to the gross-premium tax under ORS 731.804. CAT interacts with the insurance gross-premium tax through specific exclusions that depend on the type of insurance line and the regulatory status of the insurer.

R-OR-CAT-3. Agricultural cooperatives claiming the cooperative exclusion under ORS 317A.100(4)(c). The cooperative exclusion is fact-intensive and turns on the Subchapter T qualification of the cooperative under federal law.

R-OR-CAT-4. Hospitals, long-term care facilities, and other healthcare entities claiming the healthcare exclusion. The healthcare exclusion has been amended several times and requires direct review of the current statutory text and Department of Revenue guidance.

R-OR-CAT-5. Timber sales and timber-related receipts. Oregon has separate severance and forest-products taxes that interact with CAT in ways requiring specialized advice.

R-OR-CAT-6. Combined group composition questions where the unitary determination is contested. Determining whether two entities are unitary under Oregon law is fact-intensive and the Department of Revenue's audit posture is aggressive.

R-OR-CAT-7. Sourcing questions for digital advertising, marketplace facilitator transactions, or any receipts where the statutory sourcing rule does not clearly map to the taxpayer's facts. Defer to credentialed advisor with documented methodology.

R-OR-CAT-8. Refund claims older than three years from the original due date. The CAT refund-claim statute of limitations under ORS 305.270 is technical and requires review of any prior-year amendments.

R-OR-CAT-9. Audit defense and protest letters. This skill prepares returns and provides planning analysis; it does not handle administrative or litigation defense.

R-OR-CAT-10. Constitutional challenges to CAT (Commerce Clause, Due Process Clause, or state constitutional). The case law is sparse but the litigation strategy must be developed by Oregon counsel.

14. Self-checks

Before signing off on any CAT return or planning memo produced under this skill, run the following self-checks:

1. Did the taxpayer's Oregon commercial activity exceed $750,000? If yes, registration confirmed?
2. Did the taxpayer's Oregon commercial activity exceed $1,000,000? If yes, tax owed?
3. Was the 35% subtraction computed on the larger of Oregon-apportioned COGS or Oregon-apportioned labor? Both computed and compared?
4. Is the labor subtraction respecting the $500,000 per-employee cap?
5. Is the subtraction below the 95%-of-commercial-activity ceiling?
6. Are grocery sales excluded if applicable?
7. Are motor vehicle fuel receipts excluded if applicable?
8. Are receipts from sales of fixed assets excluded?
9. Are dividends, interest, and capital contributions excluded?
10. Is the sourcing methodology consistent with prior years and documented?
11. If the taxpayer is a unitary group, was the $1M exclusion applied at group level (not per-entity)?
12. Was the annual liability checked against the $5,000 threshold for quarterly estimated-payment obligation?
13. If quarterly payments were due, did the cumulative payments meet 80% of the actual annual liability?
14. For C-corporations, has the separate Oregon corporate excise tax obligation been confirmed?
15. Has CAT been included as a deductible state tax on the federal return?

15. Provenance

This skill is derived from the following primary sources:

• ORS Chapter 317A (Corporate Activity Tax), as enacted by HB 3427 (2019) and amended by HB 2164 (2019) and SB 164 (2021). Current text as of the Oregon Legislative Assembly 2024 session.
• ORS Chapter 317 (Corporate Excise Tax) and ORS Chapter 318 (Corporate Income Tax) — interaction-only references.
• OAR Chapter 150, Division 317 — Oregon Department of Revenue administrative rules implementing CAT.
• Form OR-CAT instructions, Oregon Department of Revenue, tax year 2024 (most recent published as of skill last_updated date); tax year 2025 form has been released in draft and the substantive rules tracked herein are unchanged.
• Santa Fe Natural Tobacco Co. v. Department of Revenue, 313 P.3d 1106 (Or. 2013) — Oregon Supreme Court nexus precedent.
• South Dakota v. Wayfair, Inc., 138 S.Ct. 2080 (2018) — federal economic-nexus authority.
• Oregon Department of Revenue Corporate Activity Tax website (www.oregon.gov/dor/programs/businesses/Pages/corporate-activity-tax.aspx), accessed November 2025 for current rate, threshold, and form information.

This skill is at tier 2 (content). It must be loaded alongside us-tax-workflow-base v0.2 or later. It does not replace credentialed Oregon CPA or attorney sign-off and is not a substitute for direct consultation of current statutory text.

Verified by: pending. Last updated: 2025-11-15. Version 0.1.

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