Start Here: Side Hustle
If your side income is a trade or business (not a hobby), you file Schedule C, pay SE tax, and either bump up W-2 withholding or send quarterly estimates. Etsy, Uber, freelance, OnlyFans, Twitch — same rules. Form 1099-K reporting thresholds keep changing.
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Guidance, not advice. We explain the rules, we don't assess your situation. Always seek financial or tax advice from a qualified CPA, Enrolled Agent, or tax attorney, or contact the IRS. Read our editorial scope →
Your essential reading list
- Schedule C line-by-line — How to report 1099-NEC / 1099-K income alongside your W-2.
- Self-employment tax — 15.3% on net profit even at small side-income levels.
- Quarterly estimates vs W-2 tuning — Why bumping W-2 withholding is often simpler than 1040-ES.
Calculators you'll actually use
- Self-Employment Tax Calculator — Schedule SE on side-gig net profit, stacked on W-2 income.
- Quarterly Estimated Tax Calculator — Safe-harbour analysis — most W-2 + side filers can use 110% prior-year.
- Federal Income Tax Calculator — Combine W-2 + side income at 2026 brackets.
- Home Office Deduction — Simplified method is usually the right answer for a side gig.
- No Tax on Tips (OBBBA) — If your side hustle is tipped (rideshare, food delivery).
Background guides
- Worker classification — When the platform should be treating you as a W-2 employee.
- Wayfair sales tax nexus — Etsy / Shopify side sellers — when sales tax becomes your problem.
- Home office deduction — Exclusive-and-regular-use test for the spare bedroom.
- QBI §199A — Side hustles qualify for the 20% deduction below SSTB phase-out.
Also useful
- Content creators trade guide — YouTube, Twitch, Substack income mechanics.
- Online sellers trade guide — eBay, Etsy, Poshmark — and the 1099-K threshold saga.
- Rideshare drivers trade guide — Uber/Lyft mileage logs and platform fee deductions.
- Couriers (DoorDash, Instacart) — Per-mile vs actual expense and the standalone-app trap.
What to do next
Run the SE tax + quarterly estimated tax calculators with realistic side-income numbers. If you can't easily set aside 25–30% of side revenue, increase W-2 withholding instead.
Different situation? Back to all start-here paths.