Self-Employed Tax Calculator 2026
Estimate your 2026 self-employment (SE) tax and federal income tax as a 1099 contractor, freelancer, or sole proprietor. See how solo 401(k), SEP IRA, and health insurance deductions reduce your total tax bill — with real 2026 IRS figures.
Estimate your 2026 tax bill
How self-employment taxes work
When you earn 1099 income, you pay two layers of federal tax:
- Self-employment (SE) tax — the self-employed equivalent of FICA payroll tax. This covers both the employee half (7.65%) and employer half (7.65%) of Social Security and Medicare, totaling 15.3% on the first $184,500 of net SE income (2026 SS wage base),1 then 2.9% above that. SE tax applies to net self-employment income (gross × 92.35% per IRS formula).
- Federal income tax — applied to your taxable income after deductions. Unlike SE tax, this scales with your tax bracket. Your retirement contributions, standard deduction, and other above-the-line deductions all reduce your taxable income.
Retirement contributions: the most powerful tax lever
As a self-employed person, you control your own retirement plan. Every dollar you contribute to a solo 401(k) or SEP IRA reduces your AGI dollar-for-dollar — no income limit, no phase-out. At a 35% marginal rate, a $50,000 SEP IRA contribution saves roughly $17,500 in federal income tax in the contribution year, in addition to decades of tax-deferred growth.
2026 contribution limits:
- Solo 401(k): $24,500 employee deferral + up to 20% of net SE profit as employer contribution, combined limit $72,000 (or $80,000 ages 60–63 with super catch-up)3
- SEP IRA: 25% of net compensation (effectively ~20% of net SE profit), maximum $72,000
- SIMPLE IRA: $17,000 employee deferral ($17,600 ages 50+), plus employer match
See the full comparison: Solo 401(k) guide · SEP IRA guide · Variable income comparison
How retirement contributions cut your 2026 bill — at common income levels
| Net SE income | Tax — no retirement plan | Tax — max SEP IRA | Annual savings | Marginal rate |
|---|---|---|---|---|
| $100,000 | ~$25,700 | ~$21,300 (w/ $20K SEP) | ~$4,400 | 22% |
| $200,000 | ~$61,600 | ~$52,000 (w/ $40K SEP) | ~$9,600 | 24% |
| $300,000 | ~$94,300 | ~$74,800 (w/ $60K SEP) | ~$19,600 | 35% |
| $500,000 | ~$170,400 | ~$145,200 (w/ $72K SEP) | ~$25,200 | 35% |
Estimates for single filers using 2026 brackets and standard deduction. SE deduction and standard deduction included. Actual results depend on your full tax picture.
Why SE tax isn't reduced by retirement contributions
One important nuance: retirement contributions reduce your federal income tax but do not reduce your SE tax. SE tax is calculated on your gross SE income (× 0.9235) before any deductions. This is why the SE deduction — which reduces your taxable income by half of SE tax — is sometimes called a "partial offset" rather than a full SE tax deduction. You reduce the income tax on top of SE tax, but the SE tax itself is calculated first.
The exception: if you elect S-corp status, you pay SE taxes (FICA) only on your W-2 salary — not on shareholder distributions. At $250,000 of net income with a $100,000 salary, that saves roughly $11,000–$14,000 in FICA annually versus a sole proprietorship. See: S-Corp Reasonable Salary Calculator · LLC vs. S-Corp Guide
Key 2026 self-employed tax facts
- Quarterly estimated tax due dates: April 15, June 16, September 15 (2026), January 15, 2027. See Quarterly Estimated Taxes Guide for safe-harbor rules to avoid penalties.
- SE deduction: You deduct half of SE tax on Schedule 1, line 15. This reduces your AGI, so it lowers both federal income tax and any income-dependent phaseouts (QBI, IRMAA, Roth eligibility).
- § 162(l) health insurance: If you're not eligible for employer-sponsored coverage through a spouse's job, you can deduct 100% of premiums you paid for yourself, spouse, and dependents. This is an above-the-line deduction, not itemized. Health insurance guide for the self-employed →
- Vehicle mileage: 72.5 cents/mile for 2026 business miles (IRS Notice 2026-10). Keep a contemporaneous log. See full deduction stack guide.
- Home office: $5/sq ft simplified method, up to 300 sq ft ($1,500 max) — no depreciation recapture risk. Or actual expense method if space is larger and costs are high.
Get a specialist to optimize your tax picture
This calculator gives you a ballpark — but the actual tax-minimization work requires someone who knows your full picture: entity structure, retirement plan design, S-corp election timing, QBI qualification, quarterly payments, and state taxes. A fee-only advisor who specializes in self-employed clients typically saves clients multiples of their fee in the first year of working together.
- Self-employment tax rate and 2026 SS wage base ($184,500): IRS Self-Employment Tax · SSA Contribution and Benefit Base 2026
- 2026 standard deduction ($16,100 single / $32,200 MFJ / $24,150 HoH): IRS Revenue Procedure 2025-32 / 2026 inflation adjustments · Tax Foundation 2026 Brackets
- 2026 retirement contribution limits ($24,500 deferral, $72,000 annual additions limit): IRS Notice 2025-67 (2026 limits)
- 2026 federal income tax brackets: IRS Rev. Proc. 2025-32 · Tax Foundation 2026 Brackets
Tax values verified as of May 2026.