Self-Employed Tax Calculator
Estimate your U.S. self-employment tax and a rough total tax bill in under a minute.
How self-employment tax works
If you work for yourself, you usually pay both the employee and employer portions of payroll tax. That combined amount is called self-employment tax. It generally includes:
- Social Security tax: 12.4% (up to the annual wage base limit)
- Medicare tax: 2.9% (no cap)
- Additional Medicare tax: 0.9% above threshold income levels
On top of that, you may also owe regular federal and state income tax. This page gives you a practical estimate so you can budget, set aside money, and avoid unpleasant surprises at tax time.
What this calculator estimates
The calculator provides a quick estimate of the following:
- Net business profit (gross income minus deductible expenses)
- Taxable earnings used for self-employment tax (92.35% adjustment)
- Social Security portion, including wage base interaction with W-2 wages
- Medicare and Additional Medicare tax
- Half self-employment tax deduction
- Optional rough federal and state income tax estimate based on your rates
- Estimated annual total and suggested quarterly payment target
How to use the calculator correctly
1) Enter gross income and expenses
Use annual numbers. Gross income should include all business revenue. Expenses should include ordinary and necessary business costs such as software, mileage, supplies, contractor payments, and office expenses.
2) Add W-2 wages if you also have a job
This matters because Social Security tax has a wage base cap. If your wages already consume part of that cap, your self-employment Social Security tax may be lower.
3) Choose filing status
Filing status changes the Additional Medicare threshold. This is a small but important adjustment at higher incomes.
4) Use realistic tax rates for planning
The federal and state fields are optional planning tools, not exact bracket calculations. If you are unsure, use conservative rates to avoid under-saving.
Example quick scenario
Imagine a freelancer with $100,000 gross income and $20,000 expenses. Net profit is $80,000. Self-employment tax is computed from 92.35% of that net profit, then split into Social Security and Medicare components. If that freelancer has no W-2 wages, they usually owe the full applicable self-employment amount on that base.
Once you add estimated income tax, you can decide how much to transfer each month into a tax savings account. Many people automate this right after each client payment.
Common ways self-employed people reduce tax legally
- Track every legitimate business expense all year
- Use retirement contributions (SEP IRA, Solo 401(k), SIMPLE IRA)
- Deduct health insurance premiums when eligible
- Take home office deduction when requirements are met
- Claim depreciation or Section 179 for qualified equipment
- Keep mileage and travel logs with clear documentation
Quarterly estimated payments
Most self-employed taxpayers should make quarterly estimated payments. The calculator includes a simple annual tax Ć· 4 estimate so you can plan cash flow. Actual due dates and safe harbor rules still apply, so verify your exact payment strategy with a tax professional.
Important limitations
This tool is for education and planning, not formal tax advice. It does not replace complete tax preparation. It does not account for every credit, deduction, local tax, phaseout, or special rule. Always confirm numbers with the IRS instructions or a licensed CPA/EA.
Frequently asked questions
Is self-employment tax the same as income tax?
No. Self-employment tax covers Social Security and Medicare. Income tax is separate and based on taxable income. Many self-employed people owe both.
Why does the formula use 92.35% of net profit?
IRS self-employment tax calculations apply this adjustment before the tax rates are applied. It approximates the employer-equivalent deduction effect in the formula.
Can I deduct part of self-employment tax?
Yes. Generally, you can deduct half of self-employment tax as an adjustment to income on your federal return. This calculator includes that estimate.
Should I form an LLC or S corp to lower tax?
Possibly, but it depends on profit level, payroll requirements, admin costs, and state rules. Get personalized advice before changing your entity structure.