Side Hustle Tax Calculator (USA)
Running a side hustle means the IRS treats you as self-employed — even for part-time gigs. On top of your regular federal income tax, you owe self-employment (SE) tax of 15.3% on net profit (Social Security 12.4% up to $176,100 + Medicare 2.9% unlimited). This calculator shows your real tax bill, the deductions you qualify for, and how much you actually keep after taxes.
When to use this calculator
- Freelancer estimating quarterly estimated tax payments to avoid IRS penalties
- Gig worker (Uber, DoorDash, Etsy) calculating true after-tax hourly rate
- Side business owner deciding whether to incorporate as an S-Corp to reduce SE tax
- Employee with a side hustle estimating additional taxes before year-end
- 1099 contractor comparing W-2 job offer vs. staying self-employed
- Blogger or content creator tracking deductible business expenses vs. gross revenue
How it works
2 min readWhat is self-employment tax?
Self-employment tax is a Social Security and Medicare tax owed by self-employed individuals and side hustlers on net profit. It combines 12.4% for Social Security (capped at $176,100) and 2.9% unlimited Medicare, totaling 15.3%. Side hustlers must pay this in addition to regular federal income tax.
How the Calculator Works
Side hustle income is reported on Schedule C (Profit or Loss from Business). Net profit equals gross income minus deductible business expenses. All taxes apply to this net figure.
Formula
Net Profit = Gross Income − Business Expenses
SE Tax Base = Net Profit × 0.9235 // IRS multiplier (92.35%)
SE Tax = SE Tax Base × 0.153 // 12.4% SS + 2.9% Medicare
Half SE Tax Deduction = SE Tax / 2 // Above-the-line deduction (Schedule 1)
QBI Deduction (if eligible) = (Net Profit − Half SE Deduction) × 0.20
Taxable Side Income = Net Profit
− Half SE Tax Deduction
− QBI Deduction
Federal Income Tax = Taxable Side Income × Marginal Bracket
State Income Tax = Net Profit × State Rate
Total Tax = SE Tax + Federal Income Tax + State Income Tax
Net Keep = Net Profit − Total Tax
Quarterly Payment = Total Tax / 4Worked Example
Assume: $30,000 gross, $5,000 expenses, 22% bracket, 5% state, QBI applied.
| Step | Amount |
|---|---|
| Net Profit | $25,000 |
| SE Tax Base (×0.9235) | $23,087.50 |
| SE Tax (×0.153) | $3,532.39 |
| Half SE Deduction | $1,766.19 |
| QBI Base ($25,000 − $1,766.19) | $23,233.81 |
| QBI Deduction (×0.20) | $4,646.76 |
| Taxable Side Income | $18,587.05 |
| Federal Income Tax (×0.22) | $4,089.15 |
| State Tax ($25,000 × 0.05) | $1,250.00 |
| Total Tax | $8,871.54 |
| Net Keep | $16,128.46 |
| Quarterly Payment | $2,217.89 |
2026 Key Thresholds
Limitations & When NOT to Rely Solely on This Tool
Frequently asked questions
Why is the SE tax base multiplied by 92.35% instead of the full net profit?
The IRS allows you to reduce net profit by 7.65% before calculating SE tax. This mirrors how W-2 employees only pay their half of FICA (7.65%) — employers pay the other half. Self-employed individuals get an equivalent adjustment. The factor is 1 − 0.0765 = 0.9235. See IRS Schedule SE instructions.
What counts as a deductible business expense for a side hustle?
Ordinary and necessary expenses directly tied to your business. Common examples: software subscriptions, home office (dedicated space), equipment, vehicle mileage (67 cents/mile in 2024; check 2026 IRS rate), professional services, advertising, and supplies. Personal expenses are never deductible. Keep receipts and bank records.
Do I owe SE tax if my side hustle nets less than $400?
No. The IRS does not require you to file Schedule SE or pay SE tax if your net self-employment income is under $400 for the year. However, you still must report the income on Schedule C.
What is the QBI deduction and do all self-employed people qualify?
The 20% Qualified Business Income (QBI) deduction under IRC §199A lets eligible self-employed individuals deduct 20% of qualified business income from taxable income. It phases out for Specified Service Trades or Businesses (SSTBs) — lawyers, doctors, financial advisers, consultants — once income exceeds $197,300 (single, 2026). Non-SSTB businesses have different W-2/property limits at higher incomes.
When are quarterly estimated tax payments due in 2026?
The four 2026 due dates are: April 15, June 16, September 15, and January 15, 2027. You owe estimated payments if you expect to owe at least $1,000 in federal taxes after withholding. Use IRS Form 1040-ES to calculate and submit. Missing payments triggers an underpayment penalty (currently ~8% annualized).
I also have a W-2 job. How does that affect my SE tax?
SE tax is calculated only on your self-employment net profit, regardless of W-2 wages. However, your W-2 wages count toward the $176,100 Social Security wage base. If your W-2 wages already reach $176,100, the 12.4% SS portion of SE tax on your side income is zero (only the 2.9% Medicare portion applies). The calculator does not model W-2 wages; consult IRS Schedule SE Part I for this calculation.
Can I reduce SE tax by forming an S-Corporation?
Yes. An S-Corp pays you a 'reasonable salary' (subject to payroll taxes) and the remaining profit as a distribution (not subject to SE tax). At ~$50,000+ net profit, the savings can exceed S-Corp costs (~$1,500–$2,500/year in filing fees and accounting). This is a legitimate and common strategy, but requires payroll setup and additional filings. Consult a CPA before electing S-Corp status.
What is the Additional Medicare Tax and when does it apply?
The 0.9% Additional Medicare Tax applies to self-employment income exceeding $200,000 (single filers) or $250,000 (married filing jointly) combined across all income. This calculator excludes it. If your total income approaches those thresholds, add 0.9% on the amount over the limit manually.
Does this calculator apply to gig workers on 1099-NEC or 1099-K forms?
Yes. Income reported on a 1099-NEC (nonemployee compensation) or 1099-K (payment card/third-party network, threshold $5,000 for 2024–2025, $600 from 2026) is treated as self-employment income. The same SE tax, deduction, and quarterly payment rules apply. Always reconcile 1099 totals with your own records — platforms may report gross before their fees.
What state tax rate should I enter if my state has no income tax?
Enter 0. States with no personal income tax include Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, and Wyoming. New Hampshire taxes only interest and dividends (not wages/self-employment income as of 2025). If your state uses graduated brackets, enter your effective marginal rate for the most accurate estimate.