Free 2026 calculator
Self-Employment Tax Planner
A bracket-based planning estimator using official 2026 federal figures. It includes the standard deduction, a simplified QBI estimate, W-2 wage-base interaction, Additional Medicare Tax, and a quarterly reserve reference with stated limitations.
Self-Employment Tax Estimator
Uses actual 2026 federal tax brackets — not a flat rate estimate. Results update instantly.
Planning estimate only. Applies the standard deduction, a simplified QBI deduction below the threshold, the W-2 Social Security wage-base interaction, Additional Medicare Tax, and the deductible employer-equivalent SE tax. It does not cover QBI phase-ins, tax credits, AMT, NIIT, multiple businesses, community-property rules, or annualized-income installments. Consult a CPA or EA before filing or setting payment amounts.
2026 Quarterly Payment Calendar
Roughly reserve $3,701 by each deadline. Withholding, safe-harbor rules, and uneven income can change the actual payment.
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How This Calculator Works
SE Tax (SECA)
Net self-employment income × 92.35% gives taxable SE earnings. Social Security is limited by the $184,500 combined W-2/SE wage base; Medicare has no such cap, and Additional Medicare Tax can apply above a filing-status threshold.
Income Tax via 2026 Brackets
The estimate combines SE and other income, subtracts modeled adjustments and the standard deduction, then applies a simplified QBI deduction and progressive federal brackets.
Quarterly Reserve
The planner divides the estimated remaining liability into four rough reserves and shows a safe-harbor reference using prior tax, prior AGI, and withholding. Uneven income may require Form 2210's annualized method.
2026 Federal Income Tax Brackets
Source: IRS Rev. Proc. 2025-32. These are marginal brackets: each rate applies only to taxable income within its layer.
| Rate | Single | Married Filing Jointly | Head of Household |
|---|---|---|---|
| 10% | $0 – $12,400 | $0 – $24,800 | $0 – $17,700 |
| 12% | $12,401 – $50,400 | $24,801 – $100,800 | $17,701 – $67,450 |
| 22% | $50,401 – $105,700 | $100,801 – $211,400 | $67,451 – $105,700 |
| 24% | $105,701 – $201,775 | $211,401 – $403,550 | $105,701 – $201,750 |
| 32% | $201,776 – $256,225 | $403,551 – $512,450 | $201,751 – $256,200 |
| 35% | $256,226 – $640,600 | $512,451 – $768,700 | $256,201 – $640,600 |
| 37% | Over $640,600 | Over $768,700 | Over $640,600 |
Standard deductions: $16,100 (single), $32,200 (MFJ), $24,150 (HOH). Social Security wage base: $184,500. Last reviewed July 29, 2026. Sources: IRS Rev. Proc. 2025-32 and SSA.
Frequently Asked Questions
What is the self-employment tax rate for 2026?+
The base SECA rate is 15.3%: 12.4% Social Security up to the combined 2026 wage base of $184,500, plus 2.9% Medicare without that cap. Only 92.35% of net self-employment income is generally subject to SE tax. A 0.9% Additional Medicare Tax may apply above the filing-status threshold, and W-2 wages affect both calculations.
How is this calculator different from the 1099 Tax Calculator?+
This planner uses official 2026 federal income tax brackets instead of a user-entered flat rate. It includes the standard deduction, a simplified QBI estimate below the threshold, W-2 wage interactions, and a quarterly reserve reference. It does not cover every filing adjustment or determine a tax return.
What is the QBI deduction and do I qualify?+
Section 199A can allow a deduction of up to 20% of qualified business income. The 2026 threshold is $403,500 for married filing jointly and $201,750 for most other returns. This planner applies a simplified below-threshold calculation; SSTB, W-2 wage, qualified-property, phase-in, and multi-business rules are not fully modeled.
When are 2026 quarterly estimated tax payments due?+
For calendar-year taxpayers, the general due dates are April 15, June 15, and September 15, 2026, and January 15, 2027. Weekends, holidays, fiscal years, exceptions, or annualized-income treatment can change the applicable timing; verify with IRS Publication 505.
What is the safe harbor rule for avoiding penalties?+
Common federal safe-harbor targets are 90% of current-year tax or 100% of prior-year tax, increased to 110% for some taxpayers whose prior-year AGI exceeded $150,000. Withholding, payment timing, filing status, exceptions, and annualized income also matter. The result shown here is a planning reference, not a penalty guarantee.
What deductions reduce self-employment tax?+
Only business expenses reduce the net earnings that SE tax is calculated on. Health insurance premiums, retirement contributions, and the half-of-SE-tax deduction reduce your income tax (but not SE tax itself). The QBI deduction reduces taxable income only. The biggest SE tax reducers are: home office deduction, vehicle mileage, equipment and software, professional services, and business travel.
How much should a 1099 contractor set aside for taxes?+
A percentage-of-income rule can be a cash-flow starting point, but it cannot determine what you must pay. Filing status, W-2 wages and withholding, deductions, credits, state tax, income timing, and safe-harbor rules can materially change the result. Use this planner as an estimate and consult a CPA or EA for payment decisions.
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