South Carolina taxes your income, and the rate depends on how much you earn

Yes, South Carolina has a state income tax. The state uses a progressive tax system, meaning the rate increases as your income rises. For the 2024 tax year, South Carolina's rates range from 0% on the first portion of your income to 7% on income above a certain threshold. The exact amount you owe depends on your filing status, total income, and whether you claim deductions.

South Carolina taxes wages, self-employment income, investment gains, and retirement distributions differently. Some types of income are taxed at lower rates or not at all. Understanding which income is taxable in your situation helps you plan ahead and avoid surprises when you file.

Key Takeaways

  • South Carolina's state income tax rates range from 0% to 7%, applied progressively based on your income bracket and filing status.
  • Retirement income including Social Security, military pensions, and some distributions from retirement accounts may be partially or fully excluded from South Carolina taxable income.
  • You must file a South Carolina return if your income exceeds the state's threshold for your filing status, even if you do not owe federal tax.
  • South Carolina allows you to claim the standard deduction or itemize deductions, similar to federal filing, which reduces your taxable income.
  • Tax withholding from your paycheck is based on the W-4 you file with your employer, so adjusting it can change how much you owe or receive as a refund.

How South Carolina's progressive tax brackets work

South Carolina applies different tax rates to different portions of your income. If you are single, the first portion of your income is taxed at 0%, the next portion at 3%, then 4%, 5%, 6%, and finally 7% on the highest portion. The dollar amounts where each rate kicks in change each year and depend on whether you file as single, married filing jointly, head of household, or married filing separately.

For example, if you are single and earn $50,000, you do not pay 7% on all of it. You pay 0% on the first tier, 3% on the next tier, and so on, until your income reaches the top bracket. This means your actual tax rate (called your effective rate) is lower than the top rate of 7%. The South Carolina Department of Revenue publishes the exact bracket amounts each year on its website.

Your filing status matters because married couples filing jointly have wider brackets than single filers, meaning they reach the top rate at a higher income level. If you are unsure which status to use, the IRS worksheet for choosing a filing status applies to state taxes as well.

Which types of income are taxed differently or excluded

Not all income is treated the same way in South Carolina. Social Security benefits are generally not taxed by the state, even if they are taxable on your federal return. Military pensions and survivor benefits are also excluded from South Carolina taxable income. Some retirement account distributions receive preferential treatment depending on your age and the type of account.

Long-term capital gains (profits from selling investments held more than one year) are taxed as ordinary income in South Carolina, unlike the preferential federal rates. Dividends and interest are taxed as ordinary income as well. Self-employment income is subject to both state income tax and self-employment tax, just as it is federally.

If you receive income from sources outside South Carolina, you may owe tax on it anyway if you are a resident. Non-residents who earn income within the state may owe South Carolina tax only on that in-state income. The state defines residency based on where you maintain a permanent home and where your personal and business ties are centered.

Standard deduction and itemized deductions in South Carolina

South Carolina allows you to reduce your taxable income by claiming either the standard deduction or itemized deductions, whichever is larger. The standard deduction amount varies by filing status and age. For the 2024 tax year, the standard deduction is lower in South Carolina than the federal standard deduction, so you may itemize even if you do not federally.

If you itemize, you can deduct state and local taxes (SALT), mortgage interest, charitable contributions, and certain medical expenses, subject to the same federal limitations. South Carolina does not allow deductions that the federal government does not allow, so your federal return is the starting point for your state return.

Many people find it easier to claim the standard deduction because it requires no documentation and no itemization. If your deductible expenses are close to the standard deduction amount, it may be worth calculating both to see which saves more tax.

Filing requirements and important date

You must file a South Carolina return if your income exceeds the filing threshold for your age and filing status. The threshold is lower than the federal threshold, so you may need to file a state return even if you do not owe federal tax. South Carolina uses the same filing important date as the federal government: April 15 of the year following the tax year, or the next business day if April 15 falls on a weekend or holiday.

You file using Form SC 1040 (the state individual income tax return) and any required schedules. If you use tax software, it typically handles both federal and state returns together. If you file your federal return with the IRS, you must also file your state return with the South Carolina Department of Revenue; filing one does not automatically file the other.

If you cannot file by the important date, you can request an extension from the South Carolina Department of Revenue. An extension gives you until October 15 to file, but it does not extend the important date to pay any tax you owe. If you expect to owe, paying by April 15 reduces interest and penalties.

Tax withholding and estimated payments

If you are employed, your employer withholds South Carolina income tax from your paycheck based on the W-4 form you complete. The withholding is an estimate of your annual tax liability. If too much is withheld, you receive a refund when you file. If too little is withheld, you owe when you file.

You can adjust your withholding by submitting a new W-4 to your employer at any time. If you expect a major change in income, deductions, or life circumstances, updating your W-4 helps you avoid a large bill or refund at tax time. The IRS withholding calculator on its website can help you determine the right amount.

If you are self-employed or have income not subject to withholding, you may need to make quarterly estimated tax payments to South Carolina. These are due April 15, June 15, September 15, and January 15. Underpayment of estimated tax can result in penalties and interest, even if you ultimately pay all the tax you owe.

Credits and deductions specific to South Carolina

South Carolina offers several tax credits that reduce your tax liability dollar-for-dollar. The Earned Income Tax Credit (EITC) is available to low- and moderate-income workers and is calculated based on your federal EITC. The state also offers credits for property taxes paid, education expenses, and contributions to certain savings accounts.

Some credits are refundable, meaning you receive the full amount even if it exceeds your tax liability. Others are non-refundable, meaning they can only reduce your tax to zero. The South Carolina Department of Revenue website lists all available credits and the requirements for each.

If you are over 65 or permanently disabled, you may be able to exclude a portion of your retirement income or pension income from taxation. The amount excluded depends on your total income and filing status. This is a deduction, not a credit, so it reduces your taxable income rather than your tax bill directly.

Frequently Asked Questions

Do I have to pay South Carolina income tax if I work in another state?

If you are a South Carolina resident, you owe state tax on all your income, including income earned in other states. However, you may be able to claim a credit for taxes paid to the other state to avoid double taxation. If you are a non-resident who works in South Carolina, you owe tax only on income earned within the state.

Is retirement income taxed differently in South Carolina?

Social Security is not taxed. Military pensions and some other retirement income may be partially excluded depending on your age and income level. Distributions from IRAs and 401(k)s are taxed as ordinary income. The South Carolina Department of Revenue publishes detailed guidance on which retirement income qualifies for exclusion.

What happens if I do not pay my South Carolina income tax?

The state assesses interest and penalties on unpaid tax. Interest accrues daily from the due date. Penalties can include a failure-to-pay penalty and a failure-to-file penalty if you do not file on time. If the debt remains unpaid, the state may place a lien on your property or garnish your wages or bank account.

Can I file my South Carolina return electronically?

Yes. You can file electronically through the South Carolina Department of Revenue website, through tax software, or through a tax professional. Electronic filing is faster and reduces errors. The state offers free filing options for lower-income taxpayers through the IRS Free File program.

What is the important date to amend my South Carolina return?

You can file an amended return within three years of the original due date or within two years of paying the tax, whichever is later. Use Form SC 1040-X (Amended Individual Income Tax Return) and attach an explanation of the changes. File it with the South Carolina Department of Revenue, not with your employer or the IRS.