US federal workflow for a Form 1040 with self-employment income (sole proprietor, single-member LLC or qualified joint venture), tax year 2026 with 2025 return notes: intake questions, filing status, entity and hobby tests, gross receipts, expense limits (2026 split mileage rate, home office, meals, gifts, de minimis, section 179), records, Form 1099-NEC at $2,000 from 2026, the $400 SE tax trigger, estimated tax safe harbors, and when to refer.
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| Item | 2026 | 2025 | Condition that decides it |
|---|---|---|---|
| Business standard mileage rate | 72.5 cents a mile from January 1 to June 30; 76 cents a mile from July 1 to December 31 | 70 cents a mile | 2026 has two rates. Apply each to the miles driven in its own period (IRS standard mileage rates) |
| Simplified home office | $5 a square foot, up to 300 square feet | Same | Part of the home used exclusively and regularly as the principal place of business or to meet clients, or a separate structure used for the business. Storage and daycare have their own rules (IRS simplified option; Pub. 587) |
| De minimis safe harbor, no audited financial statement | $2,500 per invoice or item | Same | Annual election on a timely filed original return, and the amounts must be expensed on the books under a policy in place at the start of the year (IRS tangible property regulations) |
| De minimis safe harbor, with an applicable financial statement | $5,000 per invoice or item | Same | Same election. The book policy must be in writing (IRS tangible property regulations) |
| Section 179 expensing limit | $2,560,000 | $2,500,000 | Reduced dollar for dollar once §179 property placed in service in the year exceeds the phase-out amount (Rev. Proc. 2025-32) |
| Section 179 phase-out starts above | $4,090,000 | $4,000,000 | See the row above |
| Section 179 limit for a sport utility vehicle | $32,000 | Not shown here; check the 2025 Form 4562 instructions | Applies to the cost of an SUV taken into account under §179 |
| Business meals | 50% deductible | Same | 80% for someone subject to Department of Transportation hours-of-service limits (Pub. 463) |
| Business gifts | $25 per recipient per year | Same | Counts gifts given directly or indirectly to each person (Pub. 463) |
| Receipts required for | Lodging, and any other expense of $75 or more | Same | Pub. 463 |
| Form 1099-NEC nonemployee compensation | $2,000 or more | $600 or more | The payment year decides. The $2,000 applies from 2026 and may be adjusted for inflation from 2027 (2026 instructions; 2025 instructions) |
| Form 1099-MISC gross proceeds paid to an attorney | $600 or more | $600 or more | Box 10. This one did not move to $2,000 (2026 instructions) |
| Backup withholding rate | 24% | 24% | Applies when a payee does not give a correct TIN, among other cases (IRS backup withholding) |
| Self-employment tax applies | Net earnings of $400 or more | Same | Topic 554 |
| Share of net profit that counts as net earnings | 92.35% | Same | Topic 554 |
| SE tax rates | 12.4% social security plus 2.9% Medicare | Same | Social security part only up to the wage base (Topic 554) |
| Social security wage base | $184,500 | $176,100 | Wages already taxed for social security use up part of the base (Pub. 505 (2026); Schedule SE (2025)) |
| Estimated tax needed if expected balance due is | At least $1,000 | Same | And withholding and credits fall short of the safe harbor. The prior-year test needs a 2025 return covering all 12 months (Pub. 505 (2026)) |
| Safe harbor | Smaller of 90% of 2026 tax or 100% of 2025 tax | Not repeated here | The 2025 return must cover 12 months. 110% instead of 100% if 2025 AGI was more than $150,000 ($75,000 if married filing separately for 2026), unless at least two-thirds of gross income is from farming or fishing (Pub. 505 (2026)) |
Figures are for tax year 2026 unless a line says 2025. The 2026 amounts come from Rev. Proc. 2025-32 and from IRS pages updated for the One Big Beautiful Bill Act (P.L. 119-21). A dated section covers 2025 returns, which are due by October 15, 2026 if the taxpayer got an extension.
This Guide is the front door for a US federal Form 1040 with self-employment income. It sets the order of work, the facts to collect, how to sort income and expenses, the records that must exist, and when to stop and refer.
us-federal-return-assembly: the order of Schedule SE, retirement, self-employed health insurance, QBI, Schedules 1, 1-A and 2, and the Form 2210 penalty.us-1099-k-and-payment-processors: Form 1099-K, payment apps, and reconciling Box 1a to Schedule C.us-capital-gains: sales of shares, funds, digital assets held as investments, and a home.us-secure-2-and-retirement-updates: plan limits and SEP, SIMPLE and solo 401(k) rules.us-tax-residency: whether the person is a resident alien at all.us-irs-collections-and-controversy: notices, audits, unpaid balances and penalties.us-tax-residency.us-tax-residency before anything else.us-1099-k-and-payment-processors.us-federal-return-assembly for Schedule SE, the retirement and health insurance deductions, and QBI, in that order.| Item | 2026 | 2025 | Condition that decides it |
|---|---|---|---|
| Business standard mileage rate | 72.5 cents a mile from January 1 to June 30; 76 cents a mile from July 1 to December 31 | 70 cents a mile | 2026 has two rates. Apply each to the miles driven in its own period (IRS standard mileage rates) |
| Simplified home office | $5 a square foot, up to 300 square feet | Same | Part of the home used exclusively and regularly as the principal place of business or to meet clients, or a separate structure used for the business. Storage and daycare have their own rules (IRS simplified option; Pub. 587) |
| De minimis safe harbor, no audited financial statement | $2,500 per invoice or item | Same | Annual election on a timely filed original return, and the amounts must be expensed on the books under a policy in place at the start of the year (IRS tangible property regulations) |
| De minimis safe harbor, with an applicable financial statement | $5,000 per invoice or item | Same | Same election. The book policy must be in writing (IRS tangible property regulations) |
| Section 179 expensing limit | $2,560,000 | $2,500,000 | Reduced dollar for dollar once §179 property placed in service in the year exceeds the phase-out amount (Rev. Proc. 2025-32) |
| Section 179 phase-out starts above | $4,090,000 | $4,000,000 | See the row above |
| Section 179 limit for a sport utility vehicle | $32,000 | Not shown here; check the 2025 Form 4562 instructions | Applies to the cost of an SUV taken into account under §179 |
| Business meals | 50% deductible | Same | 80% for someone subject to Department of Transportation hours-of-service limits (Pub. 463) |
| Business gifts | $25 per recipient per year | Same | Counts gifts given directly or indirectly to each person (Pub. 463) |
| Receipts required for | Lodging, and any other expense of $75 or more | Same | Pub. 463 |
| Form 1099-NEC nonemployee compensation | $2,000 or more | $600 or more | The payment year decides. The $2,000 applies from 2026 and may be adjusted for inflation from 2027 (2026 instructions; 2025 instructions) |
| Form 1099-MISC gross proceeds paid to an attorney | $600 or more | $600 or more | Box 10. This one did not move to $2,000 (2026 instructions) |
| Backup withholding rate | 24% | 24% | Applies when a payee does not give a correct TIN, among other cases (IRS backup withholding) |
| Self-employment tax applies | Net earnings of $400 or more | Same | Topic 554 |
| Share of net profit that counts as net earnings | 92.35% | Same | Topic 554 |
| SE tax rates | 12.4% social security plus 2.9% Medicare | Same | Social security part only up to the wage base (Topic 554) |
| Social security wage base | $184,500 | $176,100 | Wages already taxed for social security use up part of the base (Pub. 505 (2026); Schedule SE (2025)) |
| Estimated tax needed if expected balance due is | At least $1,000 | Same | And withholding and credits fall short of the safe harbor. The prior-year test needs a 2025 return covering all 12 months (Pub. 505 (2026)) |
| Safe harbor | Smaller of 90% of 2026 tax or 100% of 2025 tax | Not repeated here | The 2025 return must cover 12 months. 110% instead of 100% if 2025 AGI was more than $150,000 ($75,000 if married filing separately for 2026), unless at least two-thirds of gross income is from farming or fishing (Pub. 505 (2026)) |
The QBI thresholds, the Additional Medicare Tax and the net investment income tax are in us-federal-return-assembly and us-capital-gains. They are not repeated here.
| Rule | The condition that decides it | Source |
|---|---|---|
| Standard mileage rate: first year | For a car the taxpayer owns, the standard rate must be chosen in the first year the car is available for business use. In later years, either method can be used. For a leased car, the standard rate must be used for the whole lease period. | Pub. 463 |
| Standard mileage rate: not allowed | Not allowed if five or more cars are used at the same time, or if the car was depreciated under MACRS, by any method other than straight line, or under §179. Also not allowed if the special depreciation allowance (bonus depreciation) was claimed on the car, or, for a leased car, if actual car expenses were claimed after 1997. | Pub. 463 |
| Commuting | Travel between home and a regular place of work is personal. Travel from home to a temporary work location outside the metropolitan area is deductible. If the taxpayer has one or more regular work locations away from home, trips between home and a temporary work location in the same business are deductible regardless of distance. If home is the principal place of business, trips between home and another work location in the same business are deductible, whether the work is temporary or permanent and regardless of distance. | Pub. 463 |
| Home office | Only the part of the home used exclusively and regularly as (a) the principal place of business, or (b) a place where the taxpayer meets or deals with patients, clients or customers in the normal course of business; or (c) a separate structure not attached to the home, used in connection with the business. Storage of inventory or product samples, and daycare, have their own rules (Pub. 587). The method is chosen on the timely filed original return and cannot be changed for that year. The deduction cannot exceed the gross income from the business use of the home, less business expenses. Under the simplified method any excess is lost, and there is no depreciation and no later recapture. The method can be changed from year to year. An employee working from home gets no home office deduction. | IRS simplified option |
| De minimis safe harbor | The amounts must also be expensed on the books under a consistent accounting procedure in place at the start of the tax year. With an applicable financial statement (AFS) the procedure must be written; without one it need not be. Attach a statement titled "Section 1.263(a)-1(f) de minimis safe harbor election" to the timely filed original return, including extensions, for each year it applies. An item costing more than the limit is not covered by the safe harbor, but may still be deductible under other rules. | IRS tangible property regulations |
| Entertainment and meals | Entertainment is not deductible. Food and drink bought separately from entertainment, or shown separately on the invoice, is a meal subject to the 50% limit. | Pub. 463 |
| Worker or contractor | The test is the right to control what is done and how it is done, looking at behavioral control, financial control and the type of relationship. If it is still unclear, Form SS-8 can be filed. A worker who is an employee takes the business outside this Guide. | IRS: employee or contractor |
| Form 1099-NEC due date | January 31 after the payment year, on paper or electronically. A due date on a weekend or legal holiday moves to the next business day. January 31, 2027 is a Sunday, so 2026 forms are due February 1, 2027. | Form 1099-MISC and 1099-NEC instructions |
| E-filing information returns | Required if the business files 10 or more information returns in total (all types counted together), for returns due on or after January 1, 2024. | Form 1099-MISC and 1099-NEC instructions |
| Single-member LLC with employees | Disregarded for income tax, but a separate entity for employment tax. Payroll is outside this Guide. | IRS: single-member LLCs |
| Hobby presumption | Needs gross income above deductions in 3 or more of the 5 years ending with this year (2 of 7 for horses). Failing it is not proof of a hobby. It only removes the presumption. | 26 U.S.C. 183(d) |
| Records: how long | Generally 3 years after filing. For a refund claim filed later, 3 years from filing the original return or 2 years from paying the tax, whichever is later. 6 years if unreported income is more than 25% of the gross income shown. 7 years for a claim for a loss from worthless securities or a bad debt deduction. Indefinitely if no return or a fraudulent return was filed. Employment tax records: at least 4 years after the tax becomes due or is paid, whichever is later. | IRS: how long to keep records |
Use these only as working positions in the file. Each one must be flagged, turned into a question, and resolved before filing. They are not filing positions. The return must show the correct tax, not the highest one.
| Missing fact | Provisional treatment | What resolves it |
|---|---|---|
| Filing status | None. Ask; do not assume "single". | Marital status on December 31 (Pub. 501) |
| Business-use share of a car | No vehicle deduction | A mileage log or other record of business and total miles |
| Substantiation for travel, gifts or a car | Not deductible | Records of the amount, date, place and business purpose |
| Whether a deposit is income | Treat as income | Evidence it was a transfer, loan, capital or refund |
| Whether an activity is a business | Flag. Do not deduct losses until settled. | The facts in step 5 |
| Whether a de minimis election was made in a past year | Not made. It is an annual election. | Check the return for that year |
| Whether estimated tax was paid | Not paid | IRS account transcript or payment confirmations |
| Whether a payee gave a TIN | Treat as missing. Check backup withholding. | A signed Form W-9 |
The amounts in these cases are made up for illustration. The rates, limits and thresholds come from the sources linked in each heading.
us-federal-return-assembly.us-tax-residency.us-fbar-fatca-reporting. Foreign income brings in the foreign tax credit and treaty rules.us-capital-gains for sales held as investments, and a professional for mining, staking or payment in digital assets.us-irs-collections-and-controversy.us-capital-gains for the gain rules, with professional review.us-irs-collections-and-controversy.us-tax-residency.us-federal-return-assembly.Need a company or personal tax return in the United States? Tell OpenAccountants what is due and when. Start with a free 30-minute call. We confirm availability, the accountant responsible and the price before you commit.
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