Side Hustle Tax Estimator: 2026 Free Calculator & Guide
Any side hustle earning $400+ triggers self-employment tax on top of your day-job's federal income tax. Use our free [side hustle tax estimator](https://gigmytax.com/calculators/self-employed-tax-estimator) to see exactly what you owe once your W-2 and 1099 income are stacked together.
How side hustle taxes actually work
Your W-2 wages fill up the federal brackets first. Your 1099 side hustle income sits *on top* of that — often taxed at a higher marginal rate than your day job. Plus you owe 15.3% self-employment tax on the net side-hustle profit (income − expenses).
The three taxes on side hustle income
**Federal income tax** at your marginal bracket (12–37%). **Self-employment tax** at 15.3% on net profit (12.4% Social Security up to $176,100 combined wages + 2.9% Medicare uncapped). **State income tax** where applicable.
What our estimator asks for
Filing status, W-2 wages, W-2 withholding, side-hustle gross income, business miles, other business expenses, health insurance premiums, retirement contributions, and state. Outputs federal tax, SE tax, state tax, refund/owed, and a % to save per side-hustle payout.
The 28% side hustle rule of thumb
Set aside **28% of every side-hustle payout** into a separate savings account. Covers 15.3% SE tax + ~12% federal + a small state buffer for most middle-income side hustlers.
When you need to pay quarterly
If side-hustle profit will push you past $1,000 owed at year-end (after W-2 withholding), you owe quarterly 1040-ES payments — Apr 15, Jun 16, Sep 15, Jan 15. Or increase W-4 withholding at your day job to cover it.
Deductions built into the estimator
Mileage at $0.70/mi, home office (simplified $5/sqft), phone %, supplies, software, subscriptions, health insurance, SEP-IRA/Solo 401(k). Every $1,000 of deduction saves ~$280 in tax for most side hustlers.
Common side hustles this estimator fits
Freelance design and writing, Etsy sellers, Airbnb hosts, tutoring, consulting, weekend Uber/Lyft/DoorDash, TikTok/YouTube creators, affiliate marketers, dog walking, virtual assistant, coaching.
Related calculators
For platform-specific numbers, use the [rideshare](https://gigmytax.com/calculators/rideshare-tax), [delivery driver](https://gigmytax.com/calculators/delivery-driver-tax), [creator](https://gigmytax.com/calculators/creator-tax), or [freelancer quarterly](https://gigmytax.com/calculators/freelancer-quarterly-tax) calculators.
Frequently asked questions
+How much tax do I owe on side hustle income?
Typically 25–35% of net side-hustle profit, depending on your marginal federal bracket and state. Use the estimator above for a precise number.
+Do I have to report side hustle income under $600?
Yes. The $600 threshold is only for whether the payer must send a 1099 — all income is taxable regardless of paperwork.
+Can I deduct expenses from side hustle income?
Yes — all ordinary and necessary business expenses on Schedule C. Mileage, home office, phone, supplies, software, marketing, and more.
+Should I set up an LLC for my side hustle?
An LLC changes nothing for taxes — sole prop and single-member LLC both file Schedule C. Consider it only for liability protection or when profit exceeds ~$80–100K (S-Corp election).
+How do I avoid a huge tax bill in April?
Set aside 28% of every side-hustle payout, or increase W-4 withholding at your day job so total withholding covers 100% of last year's tax.
About the author
Javed Niamat · Founder & Editor, GigTax
Javed Niamat founded GigTax to make self-employment tax math understandable for rideshare drivers, delivery couriers, creators and freelancers. He builds and maintains every calculator on this site and writes the guides that explain the numbers behind them.
Related calculators
- Side Hustle Tax CalculatorEstimate tax on side-gig 1099 income stacked on your W-2.
- Gig Worker Tax CalculatorFederal + SE + state tax and mileage for any mix of gig platforms.
- Self-Employed Paycheck CalculatorTax to hold back from each 1099 payout and your real take-home.
- Tax Calculator for Side HustleSide-gig 1099 income stacked on your W-2, with federal, SE, and state tax.
Related guides
- Side Hustle Taxes: The Complete 2026 GuideHow side hustle taxes work in 2026: 1099 rules, SE tax, quarterly payments, and how to stack a side gig on top of a W-2 job.
- Quarterly Taxes for Freelancers: The 2026 GuideHow freelancers pay 2026 quarterly estimated taxes. Due dates, safe-harbor rules, penalty math, and step-by-step instructions using IRS Direct Pay or EFTPS.
- How Much Should I Save for Taxes as a Self-Employed Worker in 2026The exact % of every 1099 payout to save for taxes in 2026. Covers federal, self-employment, and state tax for freelancers, gig workers, and contractors.
- 1099 Tax Guide for Beginners: The 2026 WalkthroughNew to 1099 income? This beginner's guide covers forms, quarterly taxes, deductions, SE tax, and how to file — everything you need for the 2026 tax year.
- Self-Employment Tax Explained: 2026 Rates, Rules, and MathSelf-employment tax explained in plain English: 15.3% breakdown, the 92.35% adjustment, the ½ SE deduction, thresholds, and how to pay it in 2026.