Self-Employment Tax Calculator
This self-employment tax calculator estimates SE tax on freelance, contract, or side-business income using a simple federal approach.
Calculator
Adjust the inputs to explore different scenarios instantly.
Estimated self-employment tax
$11,728
How it works
Enter gross self-employed income, deductible business expenses, and filing status. The calculator estimates net income, applies the standard self-employment tax formula to 92.35% of net earnings, and then adds a simplified federal tax estimate to show an after-tax view.
Example calculation
A freelancer earning $95,000 with $12,000 of deductible expenses will see net earnings first, then self-employment tax calculated on the adjusted base instead of the full gross amount.
Why this matters
Self-employed workers often underestimate how much they need to reserve for taxes. A quick estimate helps with pricing, quarterly planning, and cash-flow decisions.
Self-employment tax is its own planning problem
Self-employment tax is separate from regular income tax. That is why freelance, contractor, and side-business income can feel more expensive at tax time than a normal paycheck.
This calculator focuses on the Social Security and Medicare side of self-employed income so you can see the tax that often gets missed when planning rates, quarterly payments, or cash reserves.
What the estimate isolates
- Starts with self-employment income after deductible business expenses.
- Applies the standard 92.35% net-earnings adjustment used in the simplified SE tax calculation.
- Estimates self-employment tax using the combined Social Security and Medicare rate.
- Shows the deductible half of self-employment tax as a separate planning figure.
When to run the numbers
- When setting aside money for freelance or 1099 taxes.
- When pricing contract work and checking whether the rate leaves enough after tax.
- When preparing for quarterly estimated tax payments.
- When comparing self-employed income with W-2 pay.
Example: net earnings are the starting point
A contractor with strong gross revenue may owe self-employment tax only after allowable business expenses are subtracted.
The calculator then applies the 92.35% adjustment before estimating the Social Security and Medicare portion of the tax.
- Gross self-employment income entered by the user
- Deductible business expenses entered separately
- Self-employment tax estimated from adjusted net earnings
- Federal income tax shown only as a simplified planning estimate
Self-employment tax is not the whole tax bill, but isolating it makes contractor income easier to price and budget.
How self-employment tax is estimated
The simplified self-employment tax calculation starts with net self-employment earnings, then multiplies that amount by 92.35%.
The adjusted amount is then multiplied by the self-employment tax rate. The calculator also shows half of the estimated SE tax because that amount may be deductible for federal income-tax purposes.
How to read the result
The self-employment tax estimate is only one part of your total tax picture. Federal income tax, state tax, local tax, deductions, credits, retirement contributions, and business structure can all change the final amount.
If the estimate feels higher than expected, use it as a prompt to revisit pricing, expense tracking, and quarterly tax planning before the next payment deadline.
Freelance tax mistakes
- Confusing self-employment tax with total federal income tax.
- Estimating tax from gross revenue instead of revenue after legitimate business expenses.
- Forgetting to reserve cash for quarterly payments.
- Assuming a W-2 withholding mindset works the same way for 1099 income.
- Using a simplified calculator as a substitute for tax software or professional advice.
Ways to use the estimate
- Keep business expenses organized throughout the year so the net earnings input is realistic.
- Run the estimate before raising or lowering freelance rates.
- Set aside tax money when income is received instead of waiting until filing season.
- Use the 1099 vs W-2 calculator if you are comparing contractor work with an employee offer.
Frequently asked questions
Is self-employment tax the same as income tax?
No. Self-employment tax primarily covers Social Security and Medicare, while federal income tax is a separate calculation.
Why is only 92.35% of net earnings taxed for SE tax?
That adjustment is part of the standard self-employment tax calculation used to approximate the employer-equivalent share treatment.
Does filing status affect self-employment tax itself?
Not much in this simplified calculator. Filing status is used mainly for the rough federal tax estimate shown alongside SE tax.
Can this replace tax software or a CPA?
No. This is a planning estimate and does not cover every deduction, threshold, or filing rule.