Self-Employment Tax Calculator (1099 & Quarterly Taxes)
Estimate 2026 self-employment tax on freelance and 1099 income — 15.3% SE tax on 92.35% of net earnings, the half deduction, QBI, federal income tax, and the quarterly payment due each quarter.
Self-Employment Tax — interactive calculator, computed instantly in your browser.
Self-Employment Tax Explained: 15.3% FICA, Deductions, and Quarterly Payments
SE Tax = 15.3% × 92.35% of Net Profit
| Line | Rate | $75,000 Profit (Single) |
|---|---|---|
| Schedule SE base (profit × 92.35%) | — | $69,262.50 |
| Social Security share | 12.4% | $8,588.55 |
| Medicare share | 2.9% | $2,008.61 |
| Self-employment tax (half deductible) | 15.3% | $10,597.16 |
| Federal income tax after half-SE + QBI + standard deduction | 2026 brackets | $4,511.34 |
| Total annual tax | — | $15,108.50 |
| Quarterly payment (Form 1040-ES) | ÷ 4 | $3,777.12 |
Key Point: Every self-employed dollar carries both halves of FICA (15.3%) plus income tax — the $5,298.58 half-SE deduction and the 20% QBI deduction are what pull the effective rate on $75,000 down to 20.1%.
When you work for yourself, the payroll tax stops being your employer's problem — you owe both halves. Self-employment (SE) tax is the Social Security and Medicare contribution that a W-2 employer normally splits with you, and it sits on top of federal income tax. This calculator runs the full 2026 stack: Schedule SE, the deductions that shrink it, income tax on what remains, and the quarterly payment you should send each quarter.
1. What Self-Employment Tax Actually Covers
FICA has two parts: Social Security at 12.4% up to the 2026 wage base of $184,500, and Medicare at 2.9% with no ceiling (plus 0.9% Additional Medicare over $200,000 single / $250,000 joint). A W-2 worker pays half of each and the employer pays the other half. As self-employed, you pay the employee half and the employer half — but you also get to deduct the employer-equivalent half from your income, which is the first break in the bill.
2. The Schedule SE Formula (92.35% and the $400 Floor)
- 92.35% factor: net profit is multiplied by 0.9235 first — it treats 7.65% of the profit as the employer's equivalent FICA contribution you no longer pay twice on.
- $400 threshold: if net earnings × 0.9235 falls below $400 for the year, no SE tax is due at all.
- Wage base room: W-2 wages in the same year consume Social Security room — with $60,000 of W-2 wages, only $124,500 of the $184,500 base remains for the 12.4% share.
- Medicare has no cap: the 2.9% applies to the entire SE base, and the 0.9% surtax stacks on combined wages above the threshold.
3. The Deductions That Shrink the Bill
Three layers come off the top before income tax is calculated. The half-SE deduction removes the employer-equivalent half ($5,298.58 in our $75,000 example). The Qualified Business Income (QBI) deduction then removes 20% of what is left of net profit after half-SE ($13,940.28 here). Finally the 2026 standard deduction — $16,100 single, $32,200 joint, $24,150 head of household — applies. The result: $75,000 of profit stacks $10,597.16 of SE tax with only $4,511.34 of federal income tax.
4. Quarterly Estimated Taxes and the Safe Harbor
Nobody withholds your taxes, so the IRS wants them paid as you earn — four Form 1040-ES payments due April 15, June 15, September 15, and January 15. Divide the annual total by four ($15,108.50 ÷ 4 = $3,777.12) or, better, weight each quarter by expected income. To dodge the underpayment penalty, pay at least 90% of this year's tax or 100% of last year's (110% if your prior-year AGI exceeded $150,000). Stack W-2 income alongside? Turn the salary side into take-home with the 💵 Paycheck Calculator, check where the marginal dollars land with the 🏛️ Tax Bracket Calculator, and creators billing platforms should size revenue with the ▶️ YouTube Money Calculator — all inside the 💰 Financial Hub. Comparing an employee offer against contracting? The ⏰ Overtime Pay Calculator shows the W-2 side of premium hours.
🔗 Freelancer Tax Cross-References
Self-employment tax is the freelancer's full share of Social Security and Medicare — stack the income-tax side on top with the 🏛️ Tax Bracket Calculator, then turn profit into take-home with the 💵 Paycheck Calculator inside the 💰 Financial Hub.
Platform and creator income usually arrives on a 1099 — model the revenue side with the ▶️ YouTube Money Calculator, and see how a 1.5x premium hour changes the picture with the ⏰ Overtime Pay Calculator. Self-employed drivers also deduct every business mile at the new 76¢ IRS rate with the 🚗 IRS Mileage Rate Calculator.
Frequently Asked Questions (Self-Employment Tax)
Anyone with net self-employment earnings of $400 or more in a year — freelancers, independent contractors, gig workers, sole proprietors, and single-member LLC members. It applies whether you received a 1099-NEC, cash, or platform payouts. W-2 wages alone do not trigger SE tax; the test is on your net business profit from Schedule C or Schedule K-1.
The rates are identical — 15.3% combined — but the split is not. An employee pays 7.65% while the employer quietly pays the other 7.65%. Self-employed filers legally owe both halves, which is why SE tax feels like a surcharge. The offsetting benefit is the deduction of the employer-equivalent half above the line on Schedule 1.
15.3% on 92.35% of net earnings: 12.4% Social Security up to the 2026 wage base of $184,500, plus 2.9% Medicare with no ceiling, plus 0.9% Additional Medicare on combined wages above $200,000 single or $250,000 joint. The 92.35% factor effectively makes the rate 14.13% of your stated net profit before the half deduction.
For the 2026 tax year: April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. Pay online through IRS Direct Pay, by mail with Form 1040-ES, or through EFTPS. Missing a quarter does not automatically trigger a penalty if you hit the safe harbor — 90% of the current year's tax or 100% of last year's (110% when prior AGI exceeded $150,000).
The structural levers are built in: the 92.35% factor, the half-SE deduction, the 20% QBI deduction, and the standard deduction. Beyond those, real reductions come from an SEP-IRA or Solo 401(k), an S-corporation election that pays you a reasonable salary (only wages owe SE tax; the rest flows through without it), and accurate expense deductions on Schedule C. An S-corp election has payroll-tax savings but adds filings and reasonable-compensation rules — model it with a CPA before switching.