State tax guide
Every self-employed person in South Carolina pays the same 15.3% federal self-employment tax. But South Carolina also has a state income tax of 0% – 6.2%, which adds to your total tax burden. Here's what SC freelancers and 1099 contractors need to know.
South Carolina has a progressive state income tax with rates from 0% to 6.2%. The state has been reducing its top rate in recent years.
State Income Tax
0% – 6.2%
Federal SE Tax
15.3%
Tax Agency
South Carolina Department of Revenue
Top rate trending down; moderate overall
The federal self-employment tax rate is 15.3% on 92.35% of your net self-employment earnings. This breaks down to 12.4% for Social Security (up to the combined $184,500 wage base in 2026) and 2.9% for Medicare without that cap. Additional Medicare Tax may also apply. On top of that, South Carolina charges its own income tax of 0% – 6.2% on your taxable income.
SE Tax Formula
SE Taxable Income = Net earnings × 92.35%
SE Tax = SE Taxable Income × 15.3%
SC State Tax = Net earnings × State rate
Estimate your self-employment tax, income tax, and take-home pay. Enter your numbers below — results update instantly.
This simple estimator does not collect filing status or W-2 wages. Its Social Security estimate cannot combine a W-2 wage base, and it does not include Additional Medicare Tax.
Planning estimate only. Does not include city/county taxes, withholding, safe-harbor rules, uneven income, Additional Medicare Tax, deductions for half of SE tax, QBI deduction, or tax credits. The quarterly figure is a rough reserve, not a payment instruction. Consult a CPA or EA.
SC self-employed individuals must make quarterly estimated tax payments if they expect to owe $1,000 or more. This applies to both federal and South Carolina state taxes. The IRS and most states accept online payments.
Safe Harbor rule: pay 100% of last year's tax (110% if AGI over $150K) or 90% of this year's tax, and you avoid underpayment penalties.
Whether you live in SC or anywhere in the US, these deductions can significantly lower your tax bill:
You can deduct 50% of your self-employment tax as an above-the-line adjustment on your federal return.
Deduct a portion of rent, utilities, and internet if you use part of your home exclusively and regularly for business.
Self-employed health insurance premiums are 100% deductible on your federal return.
SEP IRA (up to 25% of net earnings) or Solo 401(k) contributions reduce your taxable income.
Thinking about going from W-2 to 1099 in South Carolina? With a 0% – 6.2% state tax rate, your breakeven 1099 rate needs to be higher than in no-tax states. Use our calculator to run the numbers.
Compare W-2 vs 1099 →The federal self-employment tax rate is 15.3% everywhere in the US. South Carolina adds a state income tax of 0% – 6.2% on top of that. Your total tax rate depends on your income level and federal tax bracket.
You pay both federal and South Carolina state estimated taxes quarterly using IRS Form 1040-ES and South Carolina Department of Revenue estimated payment forms. Use our quarterly tax calculator to estimate your payment amounts. Visit South Carolina Department of Revenue for state-specific instructions: https://dor.sc.gov/
Yes, if you expect to owe $1,000 or more in federal tax. South Carolina similarly requires estimated payments if you expect to owe state tax of $500 or more (thresholds vary by state).
Home office, health insurance premiums, retirement contributions (SEP IRA or Solo 401k), equipment and software, mileage, professional services, and 50% of your SE tax itself are all deductible. Track expenses year-round — don't wait until tax season.