Self-Employment Tax Calculator
Estimate your self-employment (SECA) tax for 2023–2025: enter your net profit, business expenses and W-2 wages to get the Social Security, Medicare and Additional Medicare tax, the deductible half, and suggested quarterly payments.
Estimate Your Self-Employment (SECA) Tax
Self-Employment Tax Formula
Where:
- \(N\) — net self-employment earnings (profit) in dollars
- \(B\) — SE tax base (92.35% of net earnings)
- \(W\) — Social Security wage base for the year ($176,100 in 2025, $168,600 in 2024, $160,200 in 2023)
- \(P\) — W-2 wages already subject to Social Security tax
- \(T\) — Additional Medicare Tax threshold ($200,000 for single filers and heads of household, $250,000 for married filing jointly)
The formula mirrors Schedule SE: you pay 15.3% on 92.35% of your profit, but the 12.4% Social Security share stops at the annual wage base after counting your W-2 wages, while the 2.9% Medicare share has no cap. The 0.9% Additional Medicare Tax applies only to combined earned income above the threshold.
Self-Employment Tax – Calculation Example
Example: a single freelancer with no W-2 job has net self-employment earnings of $80,000 in 2025.
\[B = 0.9235 \times 80{,}000 = 73{,}880\]
\[SS = 0.124 \times 73{,}880 = 9{,}161.12 \qquad Med = 0.029 \times 73{,}880 = 2{,}142.52\]
Combined income of $73,880 is below the $200,000 threshold, so the Additional Medicare Tax is $0.
\[T_{SE} = 9{,}161.12 + 2{,}142.52 = 11{,}303.64\]
Result: total self-employment tax of $11,303.64 — 14.13% of net earnings. The deductible half is $5,651.82, and each of the four quarterly estimated payments would be $2,825.91.
How to Use the Calculator
- Choose how you want to enter your earnings: either your net profit directly, or gross income minus business expenses.
- Enter your net self-employment earnings (or Gross business income and Business expenses if you chose that option). This is your Schedule C or 1099 profit after deductible costs.
- Enter your W-2 wages this year. If you had none, leave 0 — this matters because wages use up the Social Security wage base first.
- Select your Filing status, which sets the Additional Medicare Tax threshold ($250,000 for joint filers, $200,000 otherwise).
- Choose the Tax year to apply the correct Social Security wage base, then read your results below.
What Is Self-Employment Tax?
Self-employment tax (SECA tax) is the Social Security and Medicare tax that people who work for themselves pay instead of the FICA tax withheld from employees' paychecks. If your net earnings from self-employment are $400 or more in a year, you must file Schedule SE with your Form 1040 and pay it. It applies to freelancers, independent contractors, sole proprietors, and typically partners in a partnership — anyone whose income is reported on Schedule C or Schedule K-1 rather than a W-2.
The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare. Employees pay only half of this (7.65%), with their employer covering the other half — which is why the self-employed rate looks high. Two adjustments make this fairer. First, the tax is calculated on only 92.35% of your net earnings, reflecting the employer's share of the base. Second, you deduct one half of your SE tax as an adjustment to gross income on Schedule 1, which lowers your federal income tax (but not the SE tax itself).
The Social Security portion is capped: for 2025 it applies only to the first $176,100 of combined wages and SE income ($168,600 in 2024, $160,200 in 2023). Above the cap you pay only the 2.9% Medicare part, which has no ceiling. On top of that, a 0.9% Additional Medicare Tax applies to earned income above $200,000 ($250,000 for married couples filing jointly), figured on Form 8959.
Keep in mind that SE tax is separate from federal income tax, which you also owe on the same profit. This calculator covers only the SECA portion — pair the result with our Federal Income Tax Calculator to estimate your total federal bill, or with the Paycheck Calculator if you want to compare against what a W-2 employee with the same income would take home.
Wage Base and Threshold Reference
| Year | Social Security wage base | Additional Medicare threshold (single) |
|---|---|---|
| 2025 | $176,100 | $200,000 |
| 2024 | $168,600 | $200,000 |
| 2023 | $160,200 | $200,000 |
Assumptions, Limitations and Tips
- W-2 wages matter. If you also hold a job, your wages consume the Social Security wage base first. The calculator accounts for this, but if your wages exceed the base, only the Medicare parts apply to your SE income.
- Net earnings below $400 generally do not trigger SE tax at all (church employee income is an exception).
- Quarterly payments. The calculator splits the tax evenly across the four estimated payment dates (April 15, June 15, September 15, and January 15 of the following year). In practice you must also cover income tax on this profit, so your actual quarterly payment is usually larger than the SE portion shown.
- Not included: state and local taxes, optional SE tax methods, the farm or fishing variants of Schedule SE, and situations where a spouse's income affects the Additional Medicare Tax threshold for joint filers.
- Losses and multiple businesses are combined: if one activity lost money, combine all SE income and losses before entering the net figure.
- Use the result as a planning estimate. Verify current wage bases with the SSA and the rules in the Schedule SE instructions before filing, and consider setting aside roughly 25–30% of each payment you receive — a 50/30/20 budget can help keep that reserve untouchable.
Frequently Asked Questions
How do I calculate self-employment tax by hand?
Multiply your net profit by 92.35% to get the SE tax base: \(B = 0.9235 \times N\). Then apply 12.4% to the part of that base below the Social Security wage base (minus any W-2 wages you earned) and 2.9% to the whole base for Medicare. Add 0.9% Additional Medicare Tax only if your combined earned income exceeds $200,000 ($250,000 if married filing jointly). The sum is your total SE tax.
Why is self-employment tax 15.3% when employees pay only 7.65%?
Employees actually pay 15.3% too — 7.65% is withheld from their paycheck and their employer pays the other half behind the scenes. When you are self-employed, you are both the employer and the employee, so you cover the full 12.4% Social Security and 2.9% Medicare shares yourself. Two softeners apply: the tax is computed on only 92.35% of your net earnings, and you deduct half of the SE tax from your gross income.
How much should I set aside for taxes as a freelancer or contractor?
A common rule of thumb is 25–30% of every payment you receive, kept in a separate reserve. This covers SE tax (roughly 14.1% of net profit for most earners below the wage base) plus federal income tax and often state tax. Your actual percentage depends on your profit level, deductions, and state, so revisit the number quarterly and adjust as your earnings grow or shrink during the year.
Do I still owe self-employment tax if I have income above the Social Security wage base?
The 12.4% Social Security portion stops once your combined wages and SE income reach the annual cap ($176,100 in 2025), but the 2.9% Medicare portion has no ceiling — you pay it on all net SE earnings. High earners should also budget for the 0.9% Additional Medicare Tax above the $200,000 threshold ($250,000 for joint filers), reported on Form 8959.
What counts as net self-employment earnings for this calculation?
It is your gross business income minus ordinary and necessary business expenses — effectively your Schedule C profit, or your Schedule K-1 earnings if you are a partner. Do not subtract the deductible half of SE tax, the self-employed health insurance deduction, or retirement contributions before entering the figure; Schedule SE handles those adjustments itself. If you run multiple businesses, or one had a loss, combine all SE income and losses into a single net number first.
Can self-employment tax be reduced or avoided legally?
You cannot skip it on genuine self-employment income, but legitimate business deductions lower the net profit it is calculated on. Structuring as an S corporation can split income between salary and distributions, but this adds payroll costs and IRS scrutiny, so consult a tax professional first. Also remember the deduction for half of SE tax and the self-employed health insurance and retirement contribution deductions, which reduce income tax even though they do not lower SE tax itself.
What happens if I had a business loss — do I pay SE tax or get a refund?
If your combined net self-employment result is zero or negative, no SE tax is due for the year (you never get a refund of past SE tax from a loss, but the loss may offset other taxable income for income tax purposes). The calculator will show an error if expenses meet or exceed gross income because there is no positive base to tax. Note that filing Schedule SE is still unnecessary here unless you had church employee income above the small threshold.