2025 Self-Employment Tax Calculator
Calculate your total freelance federal tax burden for tax year 2025 — self-employment tax (15.3%), federal income tax, the deductible employer-half adjustment, and quarterly estimated payment amounts.
Freelance / Self-Employment Details
Tax Breakdown
How Self-Employment Tax Works
When you work as a freelancer, contractor, sole proprietor, or single-member LLC owner, you are responsible for paying both the employer and employee portions of Social Security and Medicare taxes on your net self-employment earnings. This combined liability is called self-employment tax and is computed on Schedule SE attached to Form 1040. The total rate for 2025 is 15.3%: 12.4% for Social Security (applied up to the annual Social Security wage base) plus 2.9% for Medicare (no cap on the Medicare side).
Self-employment tax is in addition to the federal income tax you owe on the same earnings. A freelancer earning $80,000 in net self-employment income pays both income tax (computed on the seven federal brackets after the standard deduction and the deductible-half SE tax adjustment) and self-employment tax (computed on 92.35% of net earnings). The two calculations are independent — owing income tax does not exempt you from self-employment tax, and vice versa.
The 92.35% Rule and the Deductible Half
Two adjustments soften the self-employment tax math. First, you only pay SE tax on 92.35% of net self-employment earnings under IRC Section 1402(a)(12). The 7.65% reduction mirrors the fact that the employer-paid half of FICA on a W-2 wage is not part of the employee's taxable wages — applying SE tax to 100% of net earnings would over-tax a freelancer relative to an equivalent W-2 worker. Second, half of the SE tax you do pay is deductible as an adjustment to gross income on Form 1040. This effectively shields the "employer half" of FICA-equivalent tax from federal income tax, again mirroring W-2 treatment.
The combined effect is that the actual marginal SE-tax burden is closer to 14.1% of gross self-employment income than the headline 15.3%, before considering federal and state income tax on the same dollars.
Quarterly Estimated Payments
Freelancers must make federal estimated tax payments four times a year — typically April 15, June 15, September 15, and January 15 (the following business day when those dates fall on a weekend). Failure to pay sufficient estimated tax through the year triggers an underpayment penalty under IRC Section 6654, computed as interest on the shortfall. The IRS's safe-harbor rules generally protect taxpayers who pay at least 90% of the current year's tax liability or 100% of the prior year's liability through estimated payments and withholding (110% of the prior year for higher earners). The IRS Form 1040-ES instructions walk through the worksheets.
What This Calculator Does Not Include
Several common freelancer tax items are intentionally outside the scope of this estimator. State income tax on self-employment earnings (most states tax it like ordinary income) is not computed. The qualified business income (QBI) deduction under IRC Section 199A — potentially up to 20% of qualified pass-through business income — is not modeled because it depends on income type, business activity, and W-2 wage tests. Retirement plan contributions (SEP-IRA, solo 401(k), SIMPLE) and the self-employed health insurance deduction can substantially reduce taxable income for many freelancers but require situation-specific inputs the calculator does not collect. City and county income taxes, where applicable, are also out of scope. The output is an estimate intended for planning, not a substitute for actual tax preparation.
Methodology and Data Sources
Self-employment tax rates and the 92.35% adjustment come from IRC Sections 1401 and 1402. The Social Security wage base is set annually by the Social Security Administration through its cost-of-living announcement. The 0.9% additional Medicare tax thresholds come from IRC Section 3101(b)(2), enacted in the Affordable Care Act. Federal income tax brackets and the standard deduction come from the IRS Revenue Procedure for tax year 2025. The Congressional Research Service has published policy analyses on self-employment tax history if you want the legislative background. The full TaxCompare methodology is documented at /methodology.
Frequently Asked Questions
How much is self-employment tax?
For 2025, the federal self-employment tax rate is 15.3%, made up of 12.4% for Social Security (applied to net earnings up to the annual Social Security wage base, around $176,100) and 2.9% for Medicare (applied to all net earnings, with no cap). High earners owe an additional 0.9% Medicare surtax on self-employment income above $200,000 (single) or $250,000 (joint). You can deduct one-half of the self-employment tax as an adjustment to gross income on Form 1040 — this represents the employer-equivalent share that wage employees do not pay.
Do freelancers pay more tax than W-2 employees?
On the Social Security and Medicare side, yes — by design. W-2 employees pay 7.65% (FICA) and the employer pays the matching 7.65%. A freelancer is both employer and employee, so the freelancer pays the full 15.3%. To partially offset that, freelancers can deduct half of the self-employment tax (the "employer half") as an above-the-line adjustment, and they can deduct ordinary and necessary business expenses on Schedule C. Whether a freelancer ends up owing more total federal tax than an equivalent W-2 employee depends on those business deductions and on how much retirement savings the freelancer puts into a SEP-IRA or solo 401(k).
What is the 92.35% rule?
You only pay self-employment tax on 92.35% of your net self-employment earnings, not 100%. The 92.35% adjustment exists to mirror how W-2 wages are computed: the employer-paid half of FICA is not part of the employee's taxable wages, so applying SE tax to 100% of self-employment net earnings would overstate the equivalent. The 92.35% factor effectively excludes that employer-equivalent portion. The figure is set in IRC Section 1402(a)(12) and has been the same since the Self-Employment Contributions Act took its current form.
Why do freelancers have to make quarterly estimated payments?
Freelancers and contractors don't have an employer withholding tax from each check, so the IRS requires direct payment of estimated taxes four times a year — on April 15, June 15, September 15, and January 15 (or the next business day if a weekend). Underpayment can trigger a penalty under IRC Section 6654, calculated as interest on the shortfall. The IRS publishes Form 1040-ES with worksheets and payment vouchers; the safe-harbor rules generally require paying at least 90% of the current year's tax or 100% of the prior year's tax (110% for higher earners) to avoid the penalty.
What does this calculator include and exclude?
The calculator computes federal income tax on net self-employment income across the seven brackets, the 15.3% self-employment tax (with the 92.35% adjustment), the additional 0.9% Medicare tax for high earners, the deductible-half adjustment, and quarterly estimated payment amounts. It does not include state income tax (which most states still apply to self-employment income), the qualified business income (QBI) deduction under IRC Section 199A (which can be 20% of qualified business income for many pass-through entities), city or county income taxes, retirement plan contributions (SEP-IRA, solo 401(k), SIMPLE), or health insurance deductions for self-employed taxpayers. The output is an estimate for planning; consult a qualified tax professional for filing decisions.
Where does this data come from?
Self-employment tax rates and the 92.35% adjustment come from IRC Sections 1401 and 1402. The Social Security wage base is set annually by the Social Security Administration. The 0.9% additional Medicare tax thresholds come from IRC Section 3101(b)(2), enacted as part of the Affordable Care Act. Federal brackets and the standard deduction come from the IRS Revenue Procedure for tax year 2025. Last refresh: April 2026.