Asked about Arizona individual income tax for self-employed individuals or sole proprietors — filing Form 140, AZ estimated tax (Form 140ES), Arizona flat tax rate, Arizona standard deduction, or any query involving Arizona state income tax compliance.
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General reference only
This Guide is general tax/accounting reference material for AI-assisted workflows. It has not been reviewed for your personal facts, documents, elections, deadlines, residency, filing status, or local procedures. Do not rely on it to file, pay, amend, or take a tax position without review by a qualified professional in the relevant jurisdiction.
Source-cited draft. This Guide is source-cited but has not been reviewed by a licensed practitioner. It may be incomplete, outdated, or wrong.
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Flat income tax rate (all filing statuses)
2.5%Arizona Revised Statutes Title 43 (Taxation of Income)
Flat rate effective from tax year
2023Arizona Revised Statutes Title 43 (Taxation of Income)
Standard deduction — Single
$15,750Arizona Department of Revenue — Individual Income Tax Highlights (2025); Arizona Form 140 Instructions (TY 2025)
Standard deduction — Married Filing Jointly
$31,500Arizona Department of Revenue — Individual Income Tax Highlights (2025); Arizona Form 140 Instructions (TY 2025)
Standard deduction — Married Filing Separately
$15,750Arizona Department of Revenue — Individual Income Tax Highlights (2025); Arizona Form 140 Instructions (TY 2025)
Standard deduction — Head of Household
$23,625Arizona Department of Revenue — Individual Income Tax Highlights (2025); Arizona Form 140 Instructions (TY 2025)
Standard Deduction Increase — qualifying charitable contributions percentage
34% of qualifying charitable contributionsArizona Department of Revenue — Individual Income Tax Highlights (2025); Arizona Form 140 Instructions (TY 2025)
Annual return filing deadline (Form 140)
April 15Arizona Revised Statutes Title 43 (Taxation of Income)
Estimated tax required — Arizona gross income threshold (Single / MFS / HOH)
> $75,000Arizona Department of Revenue — Individual Estimated Tax Payments; Arizona Form 140 Instructions (TY 2025)
Estimated tax required — Arizona gross income threshold (Married Filing Jointly)
> $150,000Arizona Department of Revenue — Individual Estimated Tax Payments; Arizona Form 140 Instructions (TY 2025)
Safe harbor — minimum payments as % of current year tax
90% of current year taxArizona Department of Revenue — Individual Estimated Tax Payments
Safe harbor — minimum payments as % of prior year tax
100% of prior year taxArizona Department of Revenue — Individual Estimated Tax Payments
Estimated tax payment due date — Q1
April 15Arizona Department of Revenue — Individual Estimated Tax Payments; Form 140ES
Estimated tax payment due date — Q2
June 15Arizona Department of Revenue — Individual Estimated Tax Payments; Form 140ES
Estimated tax payment due date — Q3
September 15Arizona Department of Revenue — Individual Estimated Tax Payments; Form 140ES
Estimated tax payment due date — Q4
January 15Arizona Department of Revenue — Individual Estimated Tax Payments; Form 140ES
Arizona tax liability formula
Arizona taxable income × 2.5%Arizona Revised Statutes Title 43 (Taxation of Income); Form 140 Line 20
Social Security benefits — Arizona taxability
Fully exempt (100% subtraction from AZ computation)Arizona Revised Statutes Title 43 (Taxation of Income); Arizona Form 140 Instructions (TY 2025)
U.S. government bond interest — Arizona taxability
Exempt (subtracted from AZ income)Arizona Revised Statutes Title 43 (Taxation of Income); Arizona Form 140 Instructions (TY 2025)
Form 140 — Federal AGI line
Line 12Arizona Form 140 Instructions (TY 2025)
Form 140 — Arizona additions line
Line 13Arizona Form 140 Instructions (TY 2025)
Form 140 — Arizona subtractions line
Line 15Arizona Form 140 Instructions (TY 2025)
Form 140 — Arizona adjusted gross income line
Line 16Arizona Form 140 Instructions (TY 2025)
Form 140 — Standard or itemized deduction line
Line 18Arizona Form 140 Instructions (TY 2025)
Form 140 — Arizona taxable income line
Line 19Arizona Form 140 Instructions (TY 2025)
Form 140 — Tax (2.5% × Line 19) line
Line 20Arizona Form 140 Instructions (TY 2025)
Form 140 — Credits lines
Lines 21–30Arizona Form 140 Instructions (TY 2025)
Form 140 — Estimated payments + withholding lines
Lines 40–43Arizona Form 140 Instructions (TY 2025)
Form 140 — Balance due / refund lines
Lines 52–56Arizona Form 140 Instructions (TY 2025)
Scope. This skill covers Arizona individual income tax for self-employed individuals and sole proprietors filing Form 140. It addresses tax computation, deductions, estimated payments, and form mapping. Quality tier. Q3 — AI-drafted with citations; not independently verified by a licensed professional.
| Field | Value |
|---|---|
| Jurisdiction | Arizona, United States |
| Jurisdiction code | US-AZ |
| Tax authority | Arizona Department of Revenue (AZDOR) |
| Filing portal | https://www.aztaxes.gov |
| Legislation citation | Arizona Revised Statutes Title 43 (Taxation of Income) |
| Primary form | Form 140 — Arizona Resident Personal Income Tax |
| Filing deadline | April 15 (follows federal deadline) |
| Version | 0.1 |
| Generated | 2026-05-22 |
| Validation status | AI-drafted — Q3 |
Arizona imposes a flat income tax rate of 2.5% on all taxable income, regardless of filing status or income level. This flat rate took effect in tax year 2023.
| Filing status | Rate | Applies to |
|---|---|---|
| All statuses | 2.5% | All Arizona taxable income |
| Filing status | Standard deduction |
|---|---|
| Single | $15,750 |
| Married Filing Jointly | $31,500 |
| Married Filing Separately | $15,750 |
| Head of Household | $23,625 |
Arizona also allows a Standard Deduction Increase equal to 34% of qualifying charitable contributions (TY 2025), calculated on page 3 of Form 140.
Arizona does not use personal exemptions in the traditional sense. The standard deduction effectively replaces the exemption for most filers.
| # | Rule | Logic |
|---|---|---|
| T1-01 | Apply 2.5% flat rate to Arizona taxable income | Single rate × taxable income |
| T1-02 | Standard deduction by filing status | Fixed amounts: $15,750 / $31,500 / $23,625 |
| T1-03 | Social Security benefits fully exempt | Subtract from AZ computation |
| T1-04 | U.S. government bond interest exempt | Subtract from AZ income |
| T1-05 | Estimated tax threshold | Gross income > $75,000 (single) or $150,000 (MFJ) |
| T1-06 | Standard deduction increase | Add 34% of qualifying charitable contributions |
| # | Rule | Why judgment needed |
|---|---|---|
| T2-01 | Standard deduction vs. itemized | Taxpayer must compare both methods |
| T2-02 | IRC conformity date issues | Some federal provisions may not be adopted; requires checking current conformity |
| T2-03 | Part-year resident allocation | Requires apportionment of income to AZ residency period |
| T2-04 | Small Business Income Tax election | Taxpayer may elect to pay 2.5% separately on business income — requires evaluation of benefit |
| T2-05 | Credit for taxes paid to other states | Requires analysis of multistate income sourcing (Form 309) |
| T2-06 | Charitable contribution substantiation | Standard deduction increase requires documentation of qualified contributions |
| Pattern on bank/CC statement | Likely meaning |
|---|---|
AZ DEPT OF REVENUE / AZDOR | Arizona income tax payment (estimated or balance due) |
AZTAXES.GOV | Electronic payment via AZTaxes portal |
STATE OF AZ TAX | State tax payment |
ARIZONA DOR | Department of Revenue payment |
| Computed value | Form 140 line |
|---|---|
| Federal AGI | Line 12 |
| Arizona additions | Line 13 |
| Arizona subtractions | Line 15 |
| Arizona adjusted gross income | Line 16 |
| Standard or itemized deduction | Line 18 |
| Arizona taxable income | Line 19 |
| Tax (2.5% × Line 19) | Line 20 |
| Credits | Lines 21–30 |
| Estimated payments + withholding | Lines 40–43 |
| Balance due / refund | Lines 52–56 |
This skill must refuse and recommend professional review when:
| # | Condition |
|---|---|
| R-01 | Taxpayer has multistate business activity requiring apportionment |
| R-02 | Taxpayer is a part-year resident (Form 140PY) with complex sourcing |
| R-03 | Taxpayer is considering the Small Business Income Tax election and needs cost-benefit analysis |
| R-04 | Issues involving Arizona tax credits (solar, research, qualified facilities, etc.) |
| R-05 | Taxpayer has Arizona net operating loss carryforward |
| R-06 | Questions about TPT (Transaction Privilege Tax) nexus or classification |
| R-07 | Audit representation or controversy matters |
| R-08 | Any question about tax fraud, evasion, or aggressive positions |
This skill and its outputs are provided for informational and computational purposes only and do not constitute tax, legal, or financial advice. Open Accountants and its contributors accept no liability for any errors, omissions, or outcomes arising from the use of this skill. All outputs must be reviewed and signed off by a qualified professional (such as a CPA, EA, tax attorney, or equivalent licensed practitioner in your jurisdiction) before filing or acting upon.
The most up-to-date, verified version of this skill is maintained at openaccountants.com. Log in to access the latest version, request a professional review from a licensed accountant, and track updates as tax law changes.
Other Arizona computations in the OpenAccountants Tax Library.
Rendered from the facts database. General reference only — confirm with a qualified professional before acting.
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