What is the small business tax filing checklist for freelancers in 2026?

If you earned freelance or gig income, your year-end checklist is: gather every 1099-NEC and 1099-K, total your income and expenses, file Schedule C (profit or loss) and Schedule SE (self-employment tax) with your Form 1040, claim your deductions, confirm your quarterly estimated payments, and file by the deadline. Self-employment tax is 15.3% (12.4% Social Security plus 2.9% Medicare) on 92.35% of your net earnings.

Unlike a W-2 employee, no one withholds tax from your gig income, so the IRS treats you as both employer and employee. Sole proprietors and independent contractors report business income on Schedule C and calculate self-employment tax on Schedule SE, both attached to the personal Form 1040. The good news: you can deduct half of your self-employment tax when figuring your income tax.

The year-end checklist

1. Gather your 1099s. Any client who paid you $600 or more for services must issue a Form 1099-NEC, and payers are required to furnish those statements by January 31. Platforms may also send a 1099-K. Whether or not a form arrives, you must report all income.

2. Total income and complete Schedule C. Add up gross receipts and subtract business expenses to find net profit. The IRS uses Schedule C for sole proprietors and independent contractors to figure net earnings from self-employment.

3. Calculate self-employment tax on Schedule SE. The self-employment tax rate is 15.3%, and you must pay it if your net earnings were $400 or more. Per NerdWallet, 92.35% of net earnings are subject to the tax, and you may deduct half of what you owe. See our 2026 self-employment tax rate guide for the full math.

4. Claim your deductions. Ordinary and necessary business costs lower your taxable income. The 2026 business standard mileage rate is 72.5 cents per mile, and the home office simplified method allows a standard deduction of $5 per square foot of home used for business (maximum 300 square feet, which works out to $1,500). Review our freelancer tax write-offs list so you capture every eligible expense.

5. Confirm quarterly estimated payments. If you expect to owe $1,000 or more after withholding and credits, the IRS requires estimated payments via Form 1040-ES. For tax year 2026 the due dates are 15/04/2026, 15/06/2026, 15/09/2026 and 15/01/2027. Check our quarterly payment deadlines for 2026 and reconcile what you already paid against your final liability.

6. Keep your records. The IRS requires supporting documents — receipts, invoices, bank statements, and mileage logs — that substantiate the income and deductions on your return.

Key deadlines and forms

Your individual return (Form 1040 with Schedule C and Schedule SE attached) is generally due 15/04/2027 for tax year 2026. Set aside roughly 25–30% of gross income through the year so the final bill — income tax plus self-employment tax — doesn't catch you short. The SBA groups your obligations into income tax, self-employment tax, estimated tax, employer tax, and excise tax; for most solo freelancers, the first three are what matter.

Sources

• IRS — Self-employment tax (Social Security and Medicare taxes)
• IRS — Instructions for Forms 1099-MISC and 1099-NEC
• IRS — 2026 business standard mileage rate (72.5 cents)
• IRS — What kind of records should I keep
• NerdWallet — Self-employment tax: rates and calculator
• Found — Schedule SE tax form guide
• SBA — Pay taxes