Overview

South Carolina uses a flat 6.4% tax rate on all taxable income. Understanding how South Carolina’s tax system works helps you accurately predict your paycheck and plan your finances throughout the year.

2025 Tax Rates

South Carolina taxes all taxable income at a flat rate of 6.4%. This applies equally to all income levels — a $30,000 earner and a $300,000 earner pay the same percentage of their taxable income.

Standard Deduction

South Carolina provides a state standard deduction of $14,600 for single filers and $29,200 for married filing jointly. This amount is subtracted from gross income before your state tax rate is applied, lowering your overall state tax burden.

Who Must File in South Carolina?

Generally, any resident of South Carolina who earns income above the filing threshold must file a state income tax return. The South Carolina Department of Revenue sets annual filing thresholds, which roughly correspond to the standard deduction amounts.

How South Carolina Tax Affects Your Paycheck

Your employer withholds South Carolina state income tax from each paycheck based on your W-4 equivalent form and expected annual income. On a $75,000 annual salary, a single filer in South Carolina can expect to pay approximately $3,286–$3,866 in state income taxes annually.

Tips to Reduce Your South Carolina State Tax Bill

  • Contribute to a pre-tax 401(k) — reduces both your federal and state taxable income
  • Maximize HSA and FSA contributions if available through your employer
  • Claim all applicable deductions — South Carolina may allow deductions beyond the standard deduction
  • Review your withholding each year to avoid underpayment penalties

Filing Deadlines

South Carolina’s state income tax return is generally due on April 15, aligning with the federal deadline. An automatic extension to October 15 is usually available, but any tax owed must still be paid by April 15 to avoid penalties.

How South Carolina Compares to Neighboring States

South Carolina borders North Carolina, Georgia. Compared to its neighbors, South Carolina’s flat 6.4% rate places it in the middle of the pack for states in the region.

Use Our Calculator

Want to see your exact South Carolina take-home pay? Use our free US Paycheck Calculator — select South Carolina from the state dropdown and enter your salary, filing status, and dependents for a complete tax breakdown.

Tax rates based on 2025 data. Laws change frequently — verify with the South Carolina Department of Revenue or a tax professional.