Calculate self-employment tax, federal income tax, and quarterly estimated payments for freelancers and contractors in 2026.
Freelancers, independent contractors, gig workers, and small business owners all pay self-employment tax on their net self-employment income. Unlike W-2 employees who split FICA taxes with their employer, self-employed individuals pay the full 15.3% SE tax (12.4% Social Security + 2.9% Medicare). However, you can deduct half of your SE tax and contributions to SEP-IRA or Solo 401(k) retirement plans to reduce your federal income tax liability. Making quarterly estimated tax payments helps avoid IRS underpayment penalties — our self-employment tax calculator shows you exactly what to pay each quarter.
Self-employment (SE) tax is the equivalent of FICA taxes for self-employed individuals — freelancers, independent contractors, sole proprietors, and small business owners. SE tax is 15.3%: 12.4% for Social Security (on income up to the $184,500 wage base in 2026) and 2.9% for Medicare. Employees split this with their employer (each paying 7.65%), but self-employed individuals pay both halves. SE tax is calculated on 92.35% of net self-employment income — the IRS allows this adjustment since employees don't pay SE tax on the employer's share.
Quarterly estimated tax payments are due when you expect to owe $1,000 or more in federal taxes. Calculate your estimated payment by: (1) estimating your total tax liability for the year (SE tax + federal income tax + state income tax), (2) dividing by 4, and (3) paying each quarter by the due date. For 2026, quarterly due dates are April 15, June 16, September 15, and January 15 (2027). Underpaying by more than $1,000 may result in an IRS underpayment penalty.
Yes. The IRS allows self-employed taxpayers to deduct 50% of their SE tax as an above-the-line deduction on Form 1040, Schedule 1. This deduction reduces your Adjusted Gross Income (AGI) and therefore your federal income tax liability. For example, if your SE tax is $11,304, you can deduct $5,652, reducing your taxable income by that amount. This deduction is taken automatically — you don't need to itemize to claim it.
Self-employed individuals can deduct ordinary and necessary business expenses including: home office (if used exclusively for business), vehicle mileage (70 cents/mile in 2026) or actual vehicle expenses, health insurance premiums (100% deductible), retirement contributions (SEP-IRA up to 25% of net SE income, Solo 401k up to $70,000 in 2026), professional tools and software, business meals (50%), advertising, professional services, and business travel. These deductions reduce your net SE income before SE tax is calculated.
The 2026 quarterly estimated tax payment due dates are: Q1 (January–March income): April 15, 2026; Q2 (April–May income): June 16, 2026; Q3 (June–August income): September 15, 2026; Q4 (September–December income): January 15, 2027. Pay using IRS Direct Pay, EFTPS, or mail Form 1040-ES. If a due date falls on a weekend or federal holiday, the deadline moves to the next business day.