How self-employment tax works
- Start from net profit: self-employment income minus business expenses (Schedule C).
- Multiply by 92.35% to get net earnings from self-employment.
- Social Security: 12.4% of net earnings up to $184,500, less any W-2 wages that already count toward that base.
- Medicare: 2.9% of all net earnings, plus 0.9% Additional Medicare tax above $200,000 ($250,000 married filing jointly).
- Deduct half of the self-employment tax from your income for income tax (not from the self-employment tax itself).
Self-employment tax is only part of what a freelancer owes. The 1099 tax calculator adds federal and state income tax and the QBI deduction, and the estimated tax calculator works out the quarterly payments that avoid a penalty.
Sources: IRS Topic 554, Social Security wage base, IRS Topic 560. See our methodology.