Estimate your South Carolina state income tax plus combined federal and SC state tax for 2026. 6.4% top rate.
South Carolina has progressive income tax with a top rate of 6.4% on income over $17,330. South Carolina offers substantial retirement income deductions up to $10,000 annually for taxpayers 65+. Social Security is not taxed. Use the calculator above to estimate your combined federal and South Carolina state income tax for 2026. State tax figures use a simplified rate — for precise South Carolina state tax calculations, consult the South Carolina Department of Revenue or a licensed tax professional.
South Carolina has a 6.4% top rate state income tax for 2026. South Carolina has progressive income tax with a top rate of 6.4% on income over $17,330. South Carolina offers substantial retirement income deductions up to $10,000 annually for taxpayers 65+. Social Security is not taxed. The state income tax is calculated separately from federal income tax and is paid through payroll withholding or quarterly estimated payments.
South Carolina has its own state standard deduction separate from the federal standard deduction ($15,750 single, $31,500 MFJ in 2026). For precise South Carolina state deduction amounts, consult the South Carolina Department of Revenue or a state tax professional.
South Carolina's 6.4% top rate state income tax can be compared to other states using our state tax calculator above. The U.S. average top marginal state income tax rate is approximately 5-6%. Nine states have no income tax at all (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming), while California has the highest at 13.3%.
South Carolina offers state tax credits and deductions that may reduce your state tax liability. Common state credits include earned income credits, child tax credits, and credits for the elderly. Consult the South Carolina Department of Revenue website or a licensed tax professional for credits specific to your situation and income level.
Use the calculator above. Enter your income and SC is pre-selected as your state. The calculator computes your 2026 federal income tax using the One Big Beautiful Bill Act brackets (10%-37%), adds your estimated South Carolina state income tax (6.4% top rate simplified), and displays your total tax burden, combined effective rate, and annual take-home pay. All calculations happen instantly in your browser.