Overview
Side hustle tax calculator 2026: tax on 1099 gig income alongside a W-2 job, and the quarterly payment that avoids the penalty.
Calculate the real tax impact of your side hustle income stacked on top of your W-2 job — in seconds. Most tax calculators treat your income as one lump. But if you have a day job AND freelance/gig/1099 income, your side hustle dollars are taxed at your MARGINAL rate — not your average rate. This calculator shows you exactly what happens when income stacks. WHAT IT CALCULATES: - Combined federal income tax on W-2 + side hustle income - Self-employment tax (15.3% SECA) on side income - Effective vs marginal tax rate comparison - Quarterly estimated payment amounts - Take-home pay after all taxes - How much each additional $1,000 of side income actually costs in tax FEATURES: - 2026 tax brackets (OBBBA/TCJA permanent rates) - W-2 withholding offset — enter your paycheck withholding to see the GAP you need to cover - Self-employment tax with above-the-line deduction calculated automatically - Standard deduction applied ($15,350 single / $30,700 MFJ) - QBI deduction for qualifying business income - Clean, instant results — no signup, no data collection WHO THIS IS FOR: - Freelancers with a day job - Gig workers (Uber, DoorDash, Instacart) with W-2 employment - Side business owners - Anyone with 1099 + W-2 income wondering "how much of this do I actually keep?" FREE — Federal tax calculation, SE tax, quarterly estimates, take-home breakdown. PRO ($4.99) — Adds state income tax for all 50 states, deduction optimizer, and export. Built by QuantCalc (quantcalc.app) — makers of the Monte Carlo retirement planner trusted by the FIRE community. Your data never leaves your browser. Zero tracking. Zero data collection.
Details
- Version1.6.10
- UpdatedOctober 16, 2026
- Size232KiB
- LanguagesEnglish
- DeveloperWebsite
Email
hello@quantcalc.app - Non-traderThis developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.
Privacy
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- Not being sold to third parties, outside of the approved use cases
- Not being used or transferred for purposes that are unrelated to the item's core functionality
- Not being used or transferred to determine creditworthiness or for lending purposes
Support
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