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
Your tax bill is just the starting point.
A fee-only advisor who specializes in self-employed clients can reduce what you owe through retirement plan design, S-corp election timing, QBI optimization, and quarterly planning — typically saving multiples of their fee in year one.
Get matched with a specialist →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.
Frequently asked questions
What is the self-employment tax rate for 2026?
The self-employment tax rate for 2026 is 15.3% on net SE income up to the Social Security wage base of $184,500 (12.4% SS + 2.9% Medicare), then 2.9% on any amount above that. SE tax applies to 92.35% of gross self-employment income — not the full amount. You can deduct half of SE tax as an above-the-line deduction, reducing both your taxable income and any income-based phaseouts.
Do retirement contributions reduce self-employment tax?
No. Solo 401(k), SEP IRA, and SIMPLE IRA contributions reduce your federal income tax but do not reduce SE tax. SE tax is calculated on gross SE income before any deductions. The only true SE tax reducer is electing S-corp status — FICA applies only to your W-2 salary, not to shareholder distributions. At $250K net profit with a $100K salary, this saves roughly $11,000–$14,000 per year. See: How to reduce SE tax →
What deductions reduce self-employed income tax in 2026?
Key above-the-line deductions for 2026: (1) SE deduction — 50% of SE tax; (2) retirement contributions up to $72,000 via solo 401(k) or SEP IRA; (3) health insurance premiums under §162(l); (4) Section 199A QBI deduction — 23% of qualified business income (OBBBA permanent); (5) HSA contributions — $4,400 individual / $8,750 family. Combined, these can reduce taxable income by $50,000–$150,000+ at higher income levels. See: Full deduction stack →
How much should I set aside for taxes as self-employed in 2026?
A common guideline is 25–35% of net self-employment income. At $100K net income (single filer, no retirement plan), effective total tax is roughly 26%. At $200K, closer to 31%. At $300K with a maxed SEP IRA, it can drop to around 25%. Use this calculator with your actual deductions to get a personalized estimate — the retirement contribution slider shows exactly how much each dollar saves.
What is the 2026 solo 401(k) contribution limit?
The 2026 solo 401(k) annual additions limit is $72,000 ($80,000 ages 50–59 or 64+; $83,250 ages 60–63 with super catch-up). This combines employee deferral up to $24,500 ($35,750 ages 60–63) plus employer profit-sharing of up to 20% of net SE profit (sole prop) or 25% of W-2 wages (S-corp). See: Solo 401(k) full guide →
How do quarterly estimated taxes work for self-employed in 2026?
Self-employed individuals owe quarterly estimated taxes when they expect to owe $1,000 or more. 2026 due dates: April 15, June 16, September 15, and January 15, 2027. Avoid underpayment penalties by paying the lesser of 90% of your 2026 tax liability or 100% of your 2025 tax (110% if 2025 AGI exceeded $150,000). Use the quarterly estimated tax calculator →
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.