Self-Employment Tax (2026)

Self-employment tax is not income tax

Freelancers often focus on income tax brackets and forget Schedule SE entirely—then March brings a surprise equal to both income tax and 15.3%-style FICA on most net profit. Self-employment tax funds Social Security and Medicare. It applies on top of federal income tax, though you deduct half of SE tax when calculating AGI.

This calculator starts from net self-employment profit (after business expenses on Schedule C or equivalent) and walks through the 92.35% earnings factor, Social Security tax up to the wage base, Medicare tax on all covered earnings, and Additional Medicare Tax at high income. Pair it with the federal income tax calculator and quarterly estimated tax calculator for a full freelancer picture.

2026 FICA-equivalent rates

• Social Security: 12.4% (employee 6.2% + employer 6.2% equivalent) on combined wages and SE earnings up to $184,500
• Medicare: 2.9% on all covered earnings
• Additional Medicare Tax: 0.9% on wages and SE income above $200,000 single / $250,000 joint / $125,000 MFS thresholds

W-2 wages and self-employment earnings share one Social Security wage base. If you already paid Social Security tax on $150,000 of W-2 wages, only about $34,500 of base remains for SE earnings in 2026 before the 12.4% slice stops.

Schedule SE mechanics

Step 1 — Net profit

Enter Schedule C net profit (losses may reduce or eliminate SE tax). Guaranteed payments and certain partnership items follow different lines but the concept is similar.

Step 2 — 92.35% adjustment

Multiply net SE income by 0.9235 to get net earnings from self-employment for tax calculation.

Step 3 — Apply Social Security and Medicare

12.4% on earnings up to the remaining wage base; 2.9% Medicare on all covered earnings; 0.9% Additional Medicare when thresholds are crossed counting W-2 plus SE.

Step 4 — Deduct half

Half of SE tax is an above-the-line deduction on Form 1040, lowering AGI before the standard deduction ($16,100 single, $32,200 joint in 2026).

Worked example

Single freelancer, $80,000 Schedule C net profit, no W-2 wages:

• Net earnings: $80,000 × 92.35% ≈ $73,880
• Social Security: 12.4% × $73,880 ≈ $9,161
• Medicare: 2.9% × $73,880 ≈ $2,143
• Total SE tax ≈ $11,304 before rounding; deductible half ≈ $5,652

Income tax still applies on taxable income after the half-SE-tax deduction and standard deduction—do not stop at SE tax alone.

W-2 plus side gig coordination

Employees who freelance on weekends hit wage-base coordination. Social Security tax on W-2 may consume most of the $184,500 base, leaving only a sliver—or none—for SE Social Security tax. Medicare continues without a cap. Model combined scenarios by entering W-2 wages in advanced fields when available.

Estimated taxes and cash flow

Unlike W-2 jobs, 1099 income rarely has withholding. You owe quarterly estimated payments covering income tax and SE tax. Underpayment penalties use safe-harbor tests tied to prior-year tax or 90% of current-year tax. The tax refund estimator helps at year-end; the quarterly tool helps during the year.

Business structures (high level)

Sole proprietors report Schedule C and SE tax. LLCs taxed as disregarded entities follow the same path. S-corporations pay FICA on W-2 salary only—reasonable compensation is scrutinized by the IRS. C-corporations face corporate tax; owner-employees pay FICA on wages. This tool does not replace entity-choice analysis with a CPA.

Retirement and SE income

Net SE earnings also feed Solo 401(k) and SEP-IRA contribution calculations. Lower AGI from retirement deferrals does not eliminate SE tax on Schedule C profit, but it reduces income tax. See the contribution limits maximizer and 401(k) calculator for deferral planning.

Common mistakes

• Treating SE tax as optional or payable only with the return without estimates
• Ignoring wage-base coordination with a day job
• Forgetting the half-SE-tax AGI adjustment in income tax estimates
• Assuming an S-corp election without running payroll
• Expensing personal costs on Schedule C—audit risk without SE tax savings justification

Related tools

Compare employee vs contractor take-home with the paycheck calculator and this SE tool side by side. Add state tax via the state income tax calculator. Model large purchases and QBI considerations separately when applicable.

QBI deduction interaction (overview)

Qualified business income deduction under Section 199A reduces income tax but not SE tax. Schedule C profit still faces full SE tax while potentially generating a 20% QBI deduction subject to thresholds, SSTB limits, and W-2 wage caps. Model income tax separately in the federal calculator after SE tax and QBI—this tool stays on Schedule SE only.

Optional methods and church employee income

Ministers and certain church employees may request FICA exemption on Form 4361 but face SE tax on housing allowances in some cases. Optional methods on Schedule SE help low-profit years count toward Social Security credits. Those paths are specialized; default calculator output assumes standard Schedule C profit.

Recordkeeping for audit defense

Keep mileage logs, 1099-NEC forms, bank statements, and expense receipts aligned with Schedule C categories. SE tax recalculates from net profit—underreported income or disallowed expenses change both income tax and SE tax together.

Schedule C vs Schedule K-1 self-employment earnings

Sole proprietors report on Schedule C; partners and LLC members often receive Schedule K-1 Box 14 self-employment earnings. Guaranteed payments to partners are SE income even when the partnership shows a loss. S-corporation shareholders pay FICA on W-2 wages only—K-1 distributions are not SE income, which is why entity choice matters beyond this Schedule C calculator.

Multiple Schedule C activities net separately before SE tax in some cases; losses in one business can offset profit in another on the same return when you materially participate. Passive loss limits may defer losses without reducing SE tax until allowed.

Side gigs under $400 may still require reporting even when net profit is small; SE tax applies when net earnings from self-employment reach $400 or more for the year.

Estimated tax integration for freelancers

Schedule SE tax is due quarterly together with income tax. A common mistake is paying only income tax estimates and forgetting the SE slice. Split each voucher mentally: roughly 15.3% on 92.35% of profit for SE tax plus your marginal income tax rate on taxable profit after the half-SE-tax deduction and standard deduction ($16,100 single, $32,200 joint in 2026).

Set aside a separate bank sub-account for tax reserves—transfer a fixed percentage of each client payment so quarterly vouchers do not compete with rent when a 1099 arrives late in the quarter.

Home office and business use of home

Home office deductions reduce Schedule C net profit and therefore SE tax when allowed. Simplified vs regular method changes the deduction amount. Personal rent and mortgage interest remain nondeductible except through allocated business-use percentages.

Health insurance deductions for self-employed taxpayers reduce income tax on Form 1040 but do not reduce SE tax base—budget SE tax on full net profit before that adjustment.

Net earnings from self-employment also determine Social Security credits toward future benefits—years with low or negative Schedule C profit may show zero credits on your SSA statement even if you paid other taxes.

Quarterly vouchers should include both SE tax and income tax components—use the same bank transfer on each due date to avoid spending the SE portion.

Schedule C expense categories that move SE tax

Every legitimate business expense reduces net profit and therefore SE tax—office supplies, software, contract labor, mileage at the standard or actual rate, and home office when eligible. Personal expenses disallowed in audit get added back, increasing SE tax retroactively. Separate bank accounts for freelance income simplify substantiation.

Depreciation on equipment spreads cost over years; Section 179 or bonus depreciation accelerates deductions but still flows through Schedule C net. SE tax follows net profit after depreciation, not cash spent on the asset.

Comparison to W-2 FICA on the same dollar

Employees pay 7.65% employee FICA (6.2% SS + 1.45% Medicare) on wages; employers match another 7.65%. Self-employed workers pay both sides through SE tax (~15.3% on 92.35% of net earnings) minus the half-SE-tax income tax deduction. Contract rate “premiums” often need to exceed 15% just to break even on payroll tax alone before income tax.

Schedule C loss years and SE tax

Net Schedule C losses reduce SE tax to zero for that year but also reduce Social Security credits on your SSA record. Carryforward losses affect future profit and SE tax when the business turns profitable again. W-2 wages still consume Social Security base independently of Schedule C results.

Estimated tax pairing

Quarterly vouchers should cover SE tax plus income tax on net profit. Use the quarterly estimated tax calculator after this tool reports SE tax—do not send income-tax-only estimates when Schedule C profit is material.

Material participation and passive loss

Passive activity rules may defer Schedule C losses from offsetting W-2 wages while still affecting SE tax when allowed. Real estate professionals and material participants follow different paths—this tool assumes active Schedule C profit.

Planning takeaway

Set aside roughly 25–35% of net 1099 deposits for combined SE and income tax when starting out—adjust after the first quarterly run through the quarterly estimated tax calculator with real deductions included.

Sources and methodology

Wage base from SSA 2026 announcements ($184,500). Rates are statutory. Results follow Schedule SE structure for education—not a filed return.