Self-Employment Tax Calculator 2026

How to Use This Calculator

Quick answer: Enter your annual net self-employment income (Schedule C profit), pick your filing status, and optionally add W-2 wages. The calculator runs the exact 8-step Schedule SE computation — 92.35% base, Social Security to the wage base, Medicare, Additional Medicare Tax, the half-SE deduction, federal income tax, total burden, and your quarterly amount — instantly in your browser.

Follow these steps for the most accurate estimate:

Step 1: Enter your net self-employment income. This is your Schedule C net profit for the year — gross business receipts minus deductible business expenses. Do not enter gross revenue. If you have more than one business, add the net profits together. The calculator multiplies this figure by 92.35% (0.9235) to get the taxable SE base, exactly as Schedule SE does.

Step 2: Choose your filing status. Select Single, Married Filing Jointly, or Head of Household. Filing status controls three things: your 2026 standard deduction ($16,100 single, $32,200 joint, $24,150 head of household), the federal income-tax brackets applied to the remainder, and the Additional Medicare Tax threshold ($200,000 single or head of household, $250,000 joint).

Step 3: Add W-2 wages if you also hold a job (optional). Wages from an employer use up part of the $184,500 Social Security wage base first, and they also reduce the Additional Medicare Tax threshold dollar-for-dollar. Leave this at zero if all of your 2026 earnings are self-employment income.

Step 4: Click "Calculate SE Tax." Your results show all six outputs: total SE tax, the Social Security / Medicare / Additional Medicare split, the half-SE deduction, federal income tax on the remainder, total burden with effective rate, and your quarterly payment with all four 1040-ES due dates.

Step 5: Use the quarterly amount for estimated payments. Divide-and-pay is only the starting point: the calculator shows total divided by four plus the four due dates (April 15, June 15, September 15, 2026, and January 15, 2027). If your income is uneven through the year, see the quarterly planner section below and consider the annualized-income method on Form 1040-ES.

What the 15.3% Self-Employment Tax Actually Is

Self-employment tax (SECA tax) is the self-employed counterpart of the payroll taxes that W-2 employees and employers split under FICA. A W-2 worker pays 7.65% (6.2% Social Security plus 1.45% Medicare) and the employer matches it. A self-employed worker is both employer and employee, so both halves land on one return — 15.3% in total — computed on Schedule SE and filed with Form 1040. This tax funds Social Security retirement, disability, and survivor benefits plus Medicare hospital insurance, and paying it is what earns you Social Security work credits as a freelancer, contractor, or business owner.

The 15.3% rate itself has two parts with very different rules. The 12.4% Social Security portion applies only up to the annual wage base, which is $184,500 for 2026 — earnings above that line escape the 12.4% charge entirely. The 2.9% Medicare portion applies to all of your net self-employment earnings with no limit whatsoever. On top of both, high earners owe a 0.9% Additional Medicare Tax on earnings above $200,000 (single, head of household, and surviving spouse), $250,000 (married filing jointly), or $125,000 (married filing separately), computed on Form 8959. Wage and self-employment income interact: W-2 wages count toward both the Social Security cap and the Additional Medicare thresholds first.

Why SE Tax Is Calculated on 92.35% of Profit

The 92.35% factor is the single most-searched detail of this tax, and it exists to keep the system fair between employees and the self-employed. An employer deducts its half of payroll tax as a business expense before the employee ever sees the money; the self-employed get equivalent treatment by removing the employer-equivalent share from the base before rates apply. Schedule SE therefore multiplies net self-employment earnings by 92.35% (0.9235) first, then applies the 12.4% and 2.9% rates to that reduced base.

A concrete example makes it tangible. With $100,000 of net profit, the taxable SE base is $92,350, and the Medicare portion is 2.9% of $92,350, or $2,678 — not 2.9% of the full $100,000. The same reduction flows into the Social Security computation and the Additional Medicare Tax threshold test. If you skip the 0.9235 step, every downstream number overstates your real liability, so this calculator applies it first, exactly as Schedule SE does.

The $184,500 Social Security Wage Base for 2026

For 2026, the Social Security Administration set the contribution and benefit base at $184,500, published in its official Contribution and Benefit Base table. Only the first $184,500 of combined wage and self-employment earnings is subject to the 12.4% Social Security tax; every dollar above that line is free of it. Medicare has no corresponding cap, which is why high earners still see the 2.9% (plus possibly 0.9%) on their full base even after Social Security drops to zero at the margin.

The cap creates two planning facts worth knowing. First, if you also earn W-2 wages, those wages consume the $184,500 room before your self-employment base does — $100,000 of wages leaves only $84,500 of SE base exposed to the 12.4% rate. Second, crossing the cap does not change your Medicare or income-tax math at all, so total effective rates keep rising with income even after the Social Security portion flattens. Enter any W-2 wages in the optional field above and the calculator handles this ordering for you.

Medicare, Additional Medicare Tax, and Form 8959

The 2.9% Medicare portion is the simplest piece: it applies to your entire 92.35% base with no wage-base limit, per the IRS self-employment tax rules. The 0.9% Additional Medicare Tax is the piece most calculators get wrong, so note its three features. It applies above fixed statutory thresholds — $200,000 for single, head of household, and surviving-spouse filers, $250,000 for married filing jointly, and $125,000 for married filing separately — and these thresholds are not indexed for inflation. It is computed on Form 8959, not Schedule SE. And wages plus self-employment income combine toward the threshold, with wages reducing the SE threshold dollar-for-dollar.

In practice, most freelancers never touch the 0.9% surtax: both worked examples on this page sit below it. But once combined earnings cross the line, the marginal SE rate on each extra dollar becomes 3.8% (2.9% plus 0.9%) instead of 2.9%, after Social Security has phased out. The calculator implements the wage-reduction ordering, so mixed W-2 and freelance earners get the correct surtax figure.

The Half-SE Deduction on Schedule 1

You may deduct one-half of your self-employment tax on Schedule 1 as an above-the-line adjustment to income. "Above the line" means it lowers your adjusted gross income (AGI) directly, which in turn lowers the taxable income that federal income tax applies to — and you can claim it whether you itemize or take the standard deduction. For the $80,000 example below, the $5,651.82 deduction cuts AGI from $80,000 to $74,348.18 before the standard deduction is even subtracted.

The critical limitation: the deduction never reduces the net earnings figure that Social Security and Medicare taxes are calculated on. It softens the income-tax leg only. This asymmetry is exactly why the 8-step computation order matters — SE tax is computed first on the full base, halved for the deduction, and only then does income tax enter the picture.

The Federal Income-Tax Leg: Standard Deduction and 2026 Brackets

After the half-SE deduction, the remainder faces ordinary federal income tax. For 2026, the standard deduction is $16,100 for single and married-filing-separately filers, $32,200 for married couples filing jointly, and $24,150 for heads of household, reflecting the inflation adjustments including the One Big Beautiful Bill amendments. Subtract the standard deduction from AGI (floored at zero) to get taxable income, then apply the progressive 2026 brackets.

The 2026 single brackets are 10% to $12,400, 12% from $12,401 to $50,400, 22% to $105,700, 24% to $201,775, 32% to $256,225, 35% to $640,600, and 37% above. Joint thresholds are exactly double the single thresholds through the 22% bracket and follow the published schedule above that ($211,400, $403,550, $512,450, $768,700). Head-of-household thresholds run $17,700, $67,450, $105,700, $201,750, $256,200, and $640,600. See our Tax Brackets page for the complete breakdown. Because this leg uses the standard deduction, itemizers with large deductions will owe somewhat less income tax than shown — the calculator is an estimate, not a filed return.

2026 Self-Employment Tax Figures at a Glance

Every figure the calculator uses is sourced to an official publication. Unverified details (exact Schedule SE line numbers, state-level add-ons, QBI interaction amounts) are deliberately excluded.

Worked Examples With Every Intermediate Line

Both examples assume a single filer with no W-2 wages taking the 2026 standard deduction of $16,100. Run them through the calculator above — you will get the same figures to the cent.

Example A: $80,000 Net, Single

Base = $80,000 x 0.9235 = $73,880.00. Social Security = 12.4% x $73,880.00 = $9,161.12. Medicare = 2.9% x $73,880.00 = $2,142.52. Additional Medicare = $0 (base below $200,000). SE tax = $9,161.12 + $2,142.52 = $11,303.64 (rounds to the commonly quoted $11,304 estimate). Half-SE deduction = $11,303.64 / 2 = $5,651.82. AGI = $80,000 - $5,651.82 = $74,348.18. Taxable income = $74,348.18 - $16,100 = $58,248.18. Federal income tax = $1,240 (10% bracket) + $4,560 (12% bracket) + $2,726.60 (22% on the $12,393.18 above $50,400... precisely 7,848.18 x 22%) = $7,526.60. Total burden = $11,303.64 + $7,526.60 = $18,830.24. Effective rate = 23.54%. Quarterly payment = $18,830.24 / 4 = $4,707.56.

Example B: $150,000 Net, Single

Base = $150,000 x 0.9235 = $138,525.00. Social Security = 12.4% x $138,525.00 = $17,177.10. Medicare = 2.9% x $138,525.00 = $4,017.23. Additional Medicare = $0 (base below both the $184,500 cap issue and the $200,000 threshold — no cap or threshold effects apply). SE tax = $17,177.10 + $4,017.23 = $21,194.33. Half-SE deduction = $10,597.16. AGI = $150,000 - $10,597.16 = $139,402.84. Taxable income = $139,402.84 - $16,100 = $123,302.84. Federal income tax = $1,240 + $4,560 + $12,166.00 (22% on $55,300) + $4,224.68 (24% on $17,602.84) = $22,190.68. Total burden = $21,194.33 + $22,190.68 = $43,385.01. Effective rate = 28.92%. Quarterly payment = $43,385.01 / 4 = $10,846.25.

Quarterly Planner: Amount Divided by Four Plus Four Dates

The IRS runs on pay-as-you-go: because no employer withholds from freelance income, you must prepay through quarterly estimated tax on Form 1040-ES. The calculator's quarterly figure is simply your total burden divided by four, and for 2026 income the four deadlines are April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. Each installment covers earnings from the preceding period (January 1–March 31, April 1–May 31, June 1–August 31, September 1–December 31). Pay online through IRS Payments or by mail with the 1040-ES vouchers. Our estimated tax calculator and the estimated tax due-dates guide cover the mechanics in more depth.

Two warnings keep you out of penalty trouble. First, equal quarters assume roughly even income; if your earnings spike late in the year, the annualized-income installment method on Form 1040-ES lets you match payments to actual timing instead. Second, underpaying triggers a penalty computed on Form 2210 — the usual safe harbors are paying at least 90% of the current-year tax or 100% of last year's tax (110% at higher incomes). When in doubt, round the quarterly figure up slightly; overpaying modestly costs you nothing but a smaller refund later.

Who Must Pay: The $400 Rule

You usually must pay self-employment tax if you had net earnings from self-employment of $400 or more, per IRS Topic 554. That threshold is far lower than most newcomers expect — a single $500 freelance project can trigger a Schedule SE filing requirement. The $400 test applies to net earnings (profit after expenses), not gross receipts, and it applies separately from income tax: you can owe SE tax in a year you owe zero income tax, because the standard deduction wipes out income tax long before it touches SE tax. Church employees, ministers, and certain other groups have special election rules, but for typical freelancers, contractors, gig workers, and sole proprietors, $400 of profit means Schedule SE.

SE Tax vs W-2 Payroll Tax and the 1099 Comparison

W-2 employees split the 7.65% payroll tax with their employer and never see the employer half. Self-employed workers pay the full 15.3% through SECA because they are both employer and employee — but the half-SE deduction partly offsets the extra burden on the income-tax return, and the 92.35% base trims the starting point. Comparing offers? A $90,000 salary and $90,000 of freelance profit are not equivalent: the freelancer owes roughly $12,700 in SE tax before income tax even starts. Read our 1099-NEC vs 1099-MISC guide for which forms report your income, and note the S-corporation tradeoff many high earners evaluate — owner salary still bears payroll tax, but distributions above reasonable salary escape SE tax (at the cost of payroll complexity and compliance).

Tips to Manage Your Self-Employment Tax Burden

You cannot negotiate the 15.3% rate, but you can shrink everything it multiplies. First, deduct every legitimate business expense on Schedule C — home office, mileage, software, insurance, retirement contributions — because each deducted dollar avoids both SE tax (about 15.3 cents at the margin below the cap) and income tax. Second, fund a SEP IRA, Solo 401(k), or SIMPLE plan: contributions cut income tax (though not SE tax) and build retirement wealth simultaneously. Third, make quarterly payments on time every time; penalties and interest are pure loss. Fourth, track income monthly so a strong second half does not ambush you in January — rerun this calculator each quarter with year-to-date profit and annualize. Fifth, if profit consistently exceeds roughly $60,000–$80,000, model the S-corporation election with a tax professional, weighing payroll costs against SE-tax savings. Finally, keep SE records and W-2 records separate all year so the wage-base ordering works in your favor at filing time.