Free South Carolina Income Tax Calculator 2026 — Rates & Brackets

South Carolina Income Tax: What You Need to Know in 2026

South Carolina uses a progressive income tax system with a top marginal rate of 6.4%. Understanding how South Carolina's tax system works can help you plan your finances, maximize deductions, and avoid surprises at filing time.

South Carolina Income Tax Rate Structure

South Carolina's progressive bracket system means the first portion of your income is taxed at lower rates, with each successive bracket applying a higher rate. Only the income within each bracket is taxed at that bracket's rate. The top rate of 6.4% applies only to income above the highest bracket threshold. Your effective state tax rate — the actual percentage of total income paid — will always be lower than 6.4% unless virtually all your income falls in the top bracket.

Standard Deduction and Exemptions

Most states, including South Carolina, offer a standard deduction or personal exemption that reduces your taxable income before state tax rates apply. These amounts vary by filing status and are adjusted periodically. Check the South Carolina Department of Revenue website for current figures. Some taxpayers may benefit from itemizing state-level deductions instead, particularly those with large mortgage interest payments, charitable contributions, or medical expenses.

Federal and State Tax Combined

Your total income tax liability is the sum of federal and South Carolina state taxes. For 2026, the federal brackets range from 10% to 37%. A single filer in South Carolina earning $100,000 might face a 22% federal marginal rate plus 6.4% at the state level, but the effective combined rate will be lower due to deductions and progressive brackets. Using our calculator, you can see exactly how these layers stack up for your specific situation.

SALT Deduction Considerations

If you itemize on your federal return, you can deduct state and local taxes (SALT) — including South Carolina income tax and property taxes. However, the SALT deduction is currently capped at $10,000 ($5,000 for married filing separately). With South Carolina's income tax rate of 6.4% and property tax rate averaging 0.57%, higher-income homeowners may hit this cap quickly, reducing the federal tax benefit of state taxes paid.

Self-Employment and South Carolina Taxes

Self-employed South Carolina residents owe state income tax on their net self-employment earnings at the same rates as W-2 income. On top of that, you owe federal self-employment tax (15.3% covering both employer and employee shares of Social Security and Medicare). Estimated quarterly payments are required for both federal and South Carolina taxes if you expect to owe $1,000 or more. Missing these deadlines triggers underpayment penalties.

Retirement Income in South Carolina

South Carolina's treatment of retirement income depends on the income source. Social Security, pensions, 401(k) distributions, and IRA withdrawals may be taxed differently. Some states exempt all Social Security benefits; others apply partial exclusions based on age or total income. Review South Carolina's specific rules on the state tax authority website, as these change frequently.

Planning Strategies

To reduce your South Carolina income tax, consider maximizing pre-tax retirement contributions (traditional 401(k), IRA, HSA), timing capital gains and losses, and ensuring you claim all eligible credits and deductions. If you're near the border of a tax bracket in the progressive system, strategies like charitable giving or retirement contributions can push income into a lower effective rate. Use our income tax calculator and take home pay calculator to model different scenarios.