South Carolina taxes your wages and investment income at the state level
Yes, South Carolina has a state income tax. Unlike some states that rely only on sales tax or property tax, South Carolina requires residents to file a state income tax return and pay tax on wages, interest, dividends, and other income sources. The state uses a progressive tax system, meaning the tax rate increases as your income increases.
South Carolina's state income tax is separate from federal income tax. You will file both a federal return (Form 1040 to the IRS) and a state return (Form SC 1040 to the South Carolina Department of Revenue) if you meet the filing threshold for the state. The state tax you owe does not reduce your federal tax, and vice versa — they are calculated independently.
Key Takeaways
- South Carolina taxes ordinary income (wages, interest, dividends) using tax brackets that range from 0% to 7%, depending on your total income.
- You must file a state return if your income exceeds the filing threshold, which varies by filing status and age.
- South Carolina allows a deduction for federal income tax paid, which lowers your state taxable income.
- State income tax withholding from your paycheck is separate from federal withholding, and you can adjust either one independently on Form W-4.
- Capital gains (profit from selling investments) are taxed as ordinary income in South Carolina, not at a lower rate.
South Carolina's tax brackets and rates
South Carolina uses six tax brackets. As of the most recent tax year, the rates range from 0% on the lowest income to 7% on income above a certain threshold. The exact dollar amount where each bracket begins depends on your filing status — single, married filing jointly, head of household, or married filing separately. These bracket amounts adjust slightly each year for inflation.
For example, a single filer with $35,000 in taxable income will pay a lower rate on the first portion of that income and a higher rate on the remainder, rather than paying one flat rate on all $35,000. This is why the tax is called progressive. To find the exact brackets for your filing status and the current year, check the South Carolina Department of Revenue website or your tax software.
South Carolina also allows you to deduct the federal income tax you paid during the year. This deduction lowers your state taxable income, which in turn lowers your state tax bill. This is one of the few states that offers this deduction, and it can meaningfully reduce what you owe to South Carolina.
Who must file a South Carolina state return
You must file a state return if your income exceeds the filing threshold for your age and filing status. The threshold is lower for residents age 65 and older. A single person under 65 with less than a certain amount of income may not be required to file, but a married couple filing jointly has a higher threshold. These thresholds change each year.
Even if you are not required to file, you may want to file anyway if you had state income tax withheld from your paycheck or if you are due a refund. Filing allows you to recover that money. Additionally, if you received income that had no withholding — such as self-employment income or rental income — you may owe state tax even if your total income is below the filing threshold.
State income tax withholding from your paycheck
Your employer withholds state income tax from your paycheck based on the information you provide on Form W-4. The federal Form W-4 controls federal withholding, and South Carolina uses the same form to determine state withholding. You can adjust your withholding at any time by submitting a new W-4 to your employer.
If you have too much withheld, you will receive a refund when you file your state return. If you have too little withheld, you will owe tax when you file. To avoid a large bill at tax time, you can increase your withholding by claiming fewer allowances on your W-4. To increase your take-home pay, you can claim more allowances, though this means less will be withheld and you may owe at filing time.
Self-employment income and estimated tax payments
If you are self-employed or have income with no withholding, you may need to make quarterly estimated tax payments to South Carolina. These payments cover both state and federal tax on income that will not have withholding. You calculate your estimated tax based on your expected annual income and pay it in four installments throughout the year.
Missing estimated tax payments can result in penalties and interest, even if you ultimately owe no tax or are due a refund. If you are unsure whether you need to make estimated payments, the South Carolina Department of Revenue website has worksheets and guidance. Many self-employed people work with a tax professional to may support they are paying the correct amount each quarter.
How South Carolina taxes investment income
Interest, dividends, and capital gains are all taxed as ordinary income in South Carolina. This means they are subject to the same progressive tax brackets as your wages. Unlike some states or the federal system, South Carolina does not offer a lower tax rate for long-term capital gains or may have access to dividends.
If you sell an investment at a profit, the gain is added to your other income for the year and taxed at your marginal rate. If you have significant investment income, this can push you into a higher tax bracket. Some residents use strategies like tax-loss harvesting (selling losing investments to offset gains) to manage their state tax liability, though these strategies should be discussed with a tax professional.
Filing your South Carolina state return
You file your state return using Form SC 1040, which is available on the South Carolina Department of Revenue website. You will need your federal return information, your W-2s or 1099s, and documentation of any deductions or credits you claim. Most people file electronically, which is faster and more accurate than paper filing.
The state return important date is the same as the federal important date — normally April 15 of the year following the tax year. If you file your federal return late, your state return is also late. You can request an extension, which gives you until October 15 to file, though any tax you owe is still due by April 15 or you will owe penalties and interest.
Frequently Asked Questions
Do I have to pay South Carolina state income tax if I work in another state?
If you are a South Carolina resident, you must pay state income tax on all your income, regardless of where you earned it. If you work in another state and paid income tax there, South Carolina allows a credit for taxes paid to other states, which prevents double taxation. You will file a return in both states.
What is the difference between South Carolina state tax and federal income tax?
Federal income tax goes to the U.S. Treasury and funds national programs. State income tax goes to South Carolina and funds state programs like education and infrastructure. They use different tax brackets, different deductions, and different rules. You calculate and pay each one separately, though South Carolina allows you to deduct federal tax paid.
Can I claim dependents on my South Carolina return?
South Carolina allows you to claim dependents on your state return, similar to your federal return. The dependent must meet IRS rules and be claimed on your federal return as well. Each dependent you claim reduces your state taxable income, which lowers your state tax bill.
What happens if I do not file a South Carolina state return?
If you owe state tax and do not file, the South Carolina Department of Revenue can assess penalties and interest. If you are due a refund, you have a limited time to claim it — typically three years. Filing protects you from penalties and ensures you recover any overpayment.
Does South Carolina tax retirement income or Social Security?
South Carolina does not tax Social Security benefits. Retirement income from pensions and 401(k) withdrawals is taxed as ordinary income. Some retirement income may be excluded under specific conditions, so check the Department of Revenue website or consult a tax professional if you have substantial retirement income.