Know what you owe on side income. This free side hustle income tax calculator estimates self-employment and income tax on your side gig — taxed at your top rate — and shows what to set aside.
Your side hustle
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Estimated tax to set aside
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Enter your income and tax rates
Net profit (taxable)
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Self-employment tax
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Income tax
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After-tax income
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Estimate only. You supply the rates, since self-employment and income tax vary by country, year and income. Side income stacks on your job income, so use your top (marginal) income-tax rate. A common US SE-tax rate is 15.3%.
Use this free side hustle income tax calculator to estimate the tax on your side income. Enter your side hustle earnings, expenses and tax rates to see what to set aside and what you actually keep.
What this side hustle income tax calculator shows you
A side hustle income tax calculator estimates the tax owed on income you earn alongside a job. It subtracts expenses to find your net profit, then applies self-employment tax and income tax to show the total to set aside and your after-tax side income.
Key point for side hustlers: your side income stacks on top of your day-job income, so it’s usually taxed at your top (marginal) income-tax rate — not your average rate. Use that higher rate here for a realistic estimate. Self-employment tax (commonly ~15.3% in the US) applies on top.
Why side hustle income is taxed at your top rate
Because your salary already fills the lower tax brackets, every extra dollar from a side hustle is taxed in your highest bracket. So if your job puts you in a 22% bracket, that’s the rate to use on side income — plus self-employment tax for the payroll portion you now cover yourself.
How to use the side hustle tax calculator
Enter your side hustle income. Revenue from the side gig only.
Add business expenses. Costs that reduce your taxable profit.
Enter the self-employment tax rate. ~15.3% is common in the US.
Enter your marginal income tax rate. Your top bracket from your day job.
Read your result. Tax to set aside and take-home update instantly.
Tips for managing side hustle taxes
Set aside tax from each payment into a separate account so you’re never caught short.
Track expenses — they lower the profit that gets taxed at your top rate.
Watch for quarterly estimated taxes once side income grows, to avoid penalties.
Keep side-hustle money separate from personal spending for clean records.
Side hustle tax terms glossary
Term
What it means
Net profit
Side income minus deductible expenses.
Marginal tax rate
The rate on your highest band of income — what side income is taxed at.
Self-employment tax
Payroll taxes you pay on side-gig profit.
Estimated taxes
Quarterly payments often required as side income grows.
Side Hustle Income Tax FAQ
How is side hustle income taxed?
Side income is taxed like any self-employment income: profit after expenses is subject to self-employment tax plus income tax.
Because it stacks on your job income, it's taxed at your top (marginal) rate.
What tax rate should I use for side income?
Use your marginal income-tax rate — the bracket your salary already pushes you into — because every extra dollar of side income
falls in that top band. Add self-employment tax (commonly ~15.3% in the US) on top.
How much should I set aside for side hustle taxes?
Many side hustlers reserve 25–35% of profit, depending on their bracket. Putting it in a separate account from each payment
keeps you covered at tax time.
Do I have to report small side income?
In most countries, yes — side income is generally taxable even if small, and thresholds for reporting are low.
Check your local rules, as failing to report can lead to penalties.
Can expenses lower my side hustle tax?
Yes. Legitimate business expenses reduce your net profit, which is what's taxed. Tracking costs like supplies, software and fees
directly lowers your tax bill.
Is the side hustle income tax calculator free to use?
Yes, this side hustle income tax calculator is completely free, needs no sign-up, and gives instant results directly in your browser.
