Have a side business or freelance income? Here's how Schedule C actually works
Published October 21, 2026
If you freelance, drive for a rideshare app, sell things online, or run a single-member LLC, the IRS generally treats that as a sole proprietorship — and sole proprietorships report their income and expenses on Schedule C (Form 1040), Profit or Loss From Business, filed along with your personal Form 1040 (IRS Publication 334, Tax Guide for Small Business).
It's not just the money that hit your bank account
Schedule C asks for your gross receipts, then lets you subtract your actual, ordinary and necessary business expenses — the IRS standard for what counts as deductible (Publication 334; Publication 535, Business Expenses). Common categories include supplies, advertising, business insurance, a portion of your phone and internet if you use them for the business, and contractor or employee pay. Good records matter here more than almost anywhere else in the tax code: a spreadsheet or receipt folder you keep as you go is far easier than reconstructing a year of expenses in March.
Business use of your home and car both have their own rules
If you have a space used regularly and exclusively for the business, a home office deduction may apply — either the simplified method (a flat rate per square foot) or the actual-expense method, covered in Publication 587 (Business Use of Your Home). Vehicle expenses work similarly: either the standard mileage rate or actual costs, detailed in Publication 463 (Travel, Gift, and Car Expenses) — and either way, mileage logs are what substantiate the deduction if the IRS ever asks.
Profit from Schedule C usually means self-employment tax, too
Net profit flows to Schedule SE, which calculates Social Security and Medicare tax on self-employment income — money a W-2 employee's paycheck would already have withheld for, split with an employer. This is often the part that surprises first-time freelancers: a profitable side business can mean a real tax bill even if your income tax bracket looks low, because self-employment tax is calculated separately and is not optional.
If you expect to owe $1,000 or more for the year, plan on quarterly payments
The IRS expects estimated payments (Form 1040-ES, generally due in April, June, September, and January), not one lump sum in April. Missing them can mean a small underpayment penalty even if you pay everything by the filing deadline.
A single-member LLC doesn't change any of this at the federal level
By default, the IRS treats a single-member LLC as a "disregarded entity" for federal income tax — its income and expenses still go on your personal Schedule C unless you've separately elected to be taxed as a corporation. The LLC changes your legal liability protection, not which tax form your business income lands on.
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Sources: IRS Publication 334, Publication 535, Publication 463, Publication 587, Schedule C and Schedule SE instructions, Form 1040-ES. This is general information, not advice about your specific return.