Self-employment tax calculator
Enter your net profit from self-employment. The result shows Social Security and Medicare tax for 2026 and the half you deduct from income.
| Taxable base (92.35%) | $92,350 |
| Social Security (12.4%) | $11,451 |
| Medicare (2.9%) | $2,678 |
| Self-employment tax | $14,130 |
|---|---|
| Half you deduct | $7,065 |
| Additional Medicare tax (0.9%, single filer) | $0 |
| Total with Additional Medicare | $14,130 |
As an S corp with a $40,000 salary, Social Security and Medicare would apply to the salary only: $6,120, which is $8,010 less, before payroll costs. Full S corp comparison.
Additional Medicare tax of 0.9% applies to earnings above $200,000 for a single filer ($250,000 joint), counting W-2 wages first. It is not deductible. Wage base source.
How it is worked out
Self-employment tax is 15.3% of 92.35% of net profit: 12.4% for Social Security up to the 2026 wage base of $184,500, and 2.9% for Medicare with no limit. Half of it is deducted when working out income tax. More on self-employment tax. An S corp election moves part of the profit out of this tax: S corp savings calculator.