Estimate your self-employment tax in South Carolina for 2026. Includes the 15.3% SE tax (Social Security and Medicare), the deductible half, federal income tax, state income tax, and quarterly estimated payments.
Last updated: May 2026 · Data: IRS, BLS, state sources
SE tax is 15.3% on 92.35% of net profit. South Carolina income tax: 3% to 6.4%
South Carolina self-employed workers pay federal SE tax and federal income tax, plus South Carolina state income tax (3% to 6.4%). South Carolina exempts the first $3,460 of income from tax. The state is reducing its top rate from 6.4% toward a flat rate over the coming years. SC is very favorable for retirees, exempting most retirement income.
| Tax Component | Rate / Detail (2026) |
|---|---|
| Self-Employment (SE) Tax | 15.3% on 92.35% of net profit |
| Social Security portion | 12.4% on first $176,100 of net earnings |
| Medicare portion | 2.9% (no cap; plus 0.9% above $200,000) |
| SE Tax Deduction | Deduct half of SE tax from income |
| Federal Standard Deduction (Single) | $15,000 |
| South Carolina State Income Tax | 3% to 6.4% |
| Quarterly Due Dates | April 15, June 16, September 15, January 15 |
| Example: $60,000 Net Profit (Single) | ~$8,478 SE tax, ~$3,762/quarter total |
| Net Profit | SE Tax | Half-SE Deduction | Total Est. Tax | Per Quarter |
|---|---|---|---|---|
| $30,000 | $4,239 | $2,119 | $5,829 | $1,457 |
| $50,000 | $7,065 | $3,532 | $11,923 | $2,981 |
| $75,000 | $10,597 | $5,299 | $20,353 | $5,088 |
| $100,000 | $14,130 | $7,065 | $30,484 | $7,621 |
| $150,000 | $21,194 | $10,597 | $51,167 | $12,792 |
Single filer, standard deduction. Total tax = SE tax + federal income tax + South Carolina state tax. Estimates only.
The federal self-employment (SE) tax rate is 15.3% (12.4% Social Security plus 2.9% Medicare), the same in every state including South Carolina. It applies to 92.35% of your net self-employment profit. Social Security stops at $176,100 of net earnings; Medicare has no cap and adds 0.9% above $200,000.
Multiply your net profit by 92.35%, then apply 15.3%. For example, on $60,000 of net profit the SE tax is about $8,478. You can deduct half of that (about $4,239) from your income before figuring income tax.
South Carolina also taxes self-employment income as ordinary income (3% to 6.4%). This calculator adds federal income tax and South Carolina state income tax on top of SE tax to estimate your total liability and quarterly payments.
A common rule of thumb is 25% to 35% of net profit. On $60,000 of net profit in South Carolina, estimated total tax (SE + federal + state) is about $15,046, or roughly $3,762 per quarter. Use the calculator above for your own numbers.
Business expenses that lower net profit (equipment, software, home office, mileage, marketing) reduce both SE tax and income tax. The deductible half of SE tax, self-employed health insurance, and retirement contributions (SEP-IRA, Solo 401k) reduce income tax.