Schedule SE (Form 1040): Calculating Self-Employment Tax for 2026
In short: Schedule SE (Form 1040) is the IRS form used by self-employed taxpayers to calculate their 15.3% self-employment tax on net earnings of $400 or more, covering Social Security and Medicare, with half of the calculated tax deductible on Form 1040.
Who Must File Schedule SE for Tax Year 2026
You must complete Schedule SE if your net earnings from self-employment total $400 or more in tax year 2026. Net earnings are calculated by subtracting your eligible business expenses—reported on Schedule C or other profit schedules—from your gross self-employment income. Whether you receive 1099-NEC forms (issued at the $2,000 threshold for 2026) or 1099-K forms (issued at $20,000 and 200 transactions), all self-employment earnings count toward this threshold. Even if you hold a traditional W-2 job, income earned through side gigs or freelance client work requires Schedule SE filing once your net earnings pass $400.
How Self-Employment Tax is Calculated and Capped
The self-employment tax rate is 15.3%, which consists of two distinct components: 12.4% for Social Security and 2.9% for Medicare. The IRS applies this combined rate to 92.35% of your net self-employment earnings. For 2026, the Social Security portion applies only to the first $184,500 of combined wages and net self-employment earnings. The 2.9% Medicare tax applies to all net earnings without any cap. If you earn income from both a W-2 job and self-employment, your W-2 wages count first toward the $184,500 Social Security cap, potentially reducing the Social Security tax owed on your self-employment income.
Claiming the 50% Deduction and Managing Quarterly Payments
To offset the burden of paying both the employee and employer shares of Medicare and Social Security, the IRS allows you to deduct 50% of your total self-employment tax on Schedule 1 of Form 1040. This above-the-line deduction lowers your overall adjusted gross income before calculating federal income tax. Because self-employment tax is paid throughout the year rather than withheld, you must make estimated quarterly tax payments using Form 1040-ES. For tax year 2026, the four quarterly due dates are April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. Tracking your business expenses throughout the year—including vehicle mileage logged at 72.5 cents per mile from January 1 through June 30, and 76 cents per mile starting July 1—reduces your net profit, which directly lowers your self-employment tax liability.
Related
What the Proofly receipt scanner does — and doesn’t
Does
- Reads merchant, date, line items, tax and payment method from a photo, with a confidence meter so you can correct it before saving
- Keeps personal and per-company receipts separate
- Maps business expenses to Schedule C lines (meals already at 50%)
- Exports an audit pack: every receipt image plus a ledger, as PDF, and CSV for QuickBooks or Xero
- Has a manual mileage log priced at the IRS rate for each trip’s date
Doesn’t
- File your taxes or give tax advice
- Sync live with QuickBooks or Xero (it’s CSV export)
- Pull transactions from your bank automatically
- Track your drives by GPS
- Guarantee how an audit turns out
Frequently asked questions
What is the net earnings threshold to file Schedule SE in 2026?
You must file Schedule SE if your net earnings from self-employment are $400 or more in 2026. Net earnings are your total gross income minus allowable business expenses.
How does the self-employment tax deduction work on Form 1040?
You can deduct 50% of your total self-employment tax on Schedule 1 of Form 1040. This above-the-line deduction reduces your adjusted gross income, lowering your overall federal income tax without requiring you to itemize deductions.
Does W-2 wage income affect the Schedule SE Social Security cap?
Yes. Social Security tax is capped at $184,500 for tax year 2026 across all earned income. Your W-2 wages are counted first, so if your employer already withheld Social Security tax on $184,500, your self-employment earnings will only be subject to the 2.9% Medicare tax.
When are estimated taxes due for self-employed individuals in 2026?
Estimated tax payments covering self-employment tax and income tax are due on April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027.
Sources
This guide summarizes IRS guidance as of October 28, 2026 for planning purposes. It isn’t tax advice — confirm your situation with IRS.gov or a qualified tax professional.