South Carolina does not tax Social Security benefits, but the federal government may

South Carolina has no state income tax on Social Security retirement, survivor, or disability benefits. If you receive Social Security in South Carolina, you will not owe state tax on those payments. However, the federal government taxes Social Security benefits under its own rules, which depend on your total income for the year.

Whether you pay federal tax on Social Security is determined by a calculation called combined income. This is your adjusted gross income plus nontaxable interest plus half of your Social Security benefits. If your combined income exceeds a certain threshold, part of your benefits become taxable at the federal level. The threshold amounts have not changed since 1984 and do not adjust for inflation.

South Carolina's lack of a state income tax means you will never file a state return on Social Security income, even if you owe federal tax. This is one of the few tax advantages for retirees in the state.

Key Takeaways

  • South Carolina does not tax Social Security benefits at the state level, regardless of how much you receive or earn.
  • Federal tax on Social Security depends on your combined income: adjusted gross income plus nontaxable interest plus half your Social Security benefits.
  • If you are single and your combined income exceeds $25,000, up to 50 percent of your benefits may be taxable federally; if it exceeds $34,000, up to 85 percent may be taxable.
  • If you are married filing jointly, the thresholds are $32,000 and $44,000, and the same percentages explore.
  • You will not file a South Carolina state tax return on Social Security income, but you may need to file a federal return.

How the federal combined income test works

The federal government uses a two-tier system to determine how much of your Social Security is taxable. The first tier applies if your combined income is between $25,000 and $34,000 (single filer) or $32,000 and $44,000 (married filing jointly). In this range, up to 50 percent of your benefits become taxable.

The second tier applies if your combined income exceeds $34,000 (single) or $44,000 (married filing jointly). In this range, up to 85 percent of your benefits become taxable. The exact amount depends on how far your combined income exceeds the threshold. These thresholds have remained the same since 1984.

Combined income includes wages, self-employment income, interest, dividends, capital gains, pensions, and distributions from retirement accounts. It also includes tax-exempt interest from municipal bonds. Half of your Social Security benefit amount is added to this total to calculate whether you cross a threshold.

Examples of how federal taxation works

Suppose you are single and receive $20,000 per year in Social Security. You also have $10,000 in pension income. Your combined income is $10,000 plus $10,000 (half of your Social Security) equals $20,000. Since this is below $25,000, none of your Social Security is taxable federally.

Now suppose the same person has $20,000 in Social Security and $20,000 in pension income. Combined income is $20,000 plus $10,000 equals $30,000. This exceeds $25,000 but is below $34,000, so up to 50 percent of the benefits become taxable. The exact taxable amount is calculated using a formula, but roughly $2,500 of the $20,000 benefit would be taxable.

If the same person had $20,000 in Social Security and $30,000 in pension income, combined income would be $40,000. This exceeds $34,000, so up to 85 percent of benefits become taxable. In this case, roughly $15,000 to $17,000 of the $20,000 benefit would be taxable federally.

What counts as income for the combined income calculation

Wages and self-employment income count toward combined income. Distributions from traditional IRAs, 401(k)s, and other retirement accounts count, whether they are required or voluntary. Pensions, annuities, and rental income all count.

Interest and dividend income count, including tax-exempt municipal bond interest. Capital gains count. Distributions from Roth IRAs do not count toward combined income, but the earnings portion of a conversion from a traditional IRA to a Roth does count in the year of conversion.

Veterans benefits do not count. Supplemental Security Income (SSI) does not count. Railroad Retirement benefits have their own separate tax rules and do not use the combined income test.

Whether you must file a federal return

You may be required to file a federal income tax return even if no tax is owed, depending on your gross income and filing status. The IRS sets minimum income thresholds that trigger a filing requirement. These thresholds change each year and depend on whether you are single, married, over 65, or have other income sources.

If your only income is Social Security and your combined income is below the first threshold ($25,000 for single filers), you will not owe federal tax on the benefits. However, if you have other income—wages, pensions, interest, or capital gains—you may owe tax on that income even if your Social Security is not taxable.

The safest approach is to use the IRS worksheet in Publication 915 to calculate whether any of your Social Security is taxable. If you are unsure whether you must file, contact the IRS directly or consult a tax professional.

Withholding and estimated tax payments

If you expect to owe federal tax on your Social Security benefits, you can request that the Social Security Administration withhold federal income tax from your monthly payment. You do this by completing Form W-4V and submitting it to your local Social Security office or online through your my Social Security account.

You can choose to have 7, 10, 12, or 22 percent of your benefit withheld. Many retirees choose withholding to avoid owing a large amount at tax time. If you have other income sources that do not have withholding, you may also need to make quarterly estimated tax payments to the IRS.

Withholding from Social Security does not reduce the amount of your benefit that is taxable—it only reduces the tax you owe. The calculation of taxable benefits remains the same whether or not you request withholding.

Other income sources that affect taxation

If you work while receiving Social Security before your full retirement age, your earnings reduce your benefit amount under the earnings test. However, the earnings test is separate from the tax calculation. Even if your benefit is reduced due to earnings, you still use your full benefit amount (before the reduction) when calculating combined income for tax purposes.

If you are married and file jointly, both spouses' incomes count toward the combined income threshold. If one spouse has high income and the other receives Social Security, the high earner's income can push the Social Security into the taxable range. Married couples filing separately face even stricter rules: if either spouse has any combined income above zero, up to 85 percent of benefits become taxable.

Frequently Asked Questions

Do I have to pay South Carolina state tax on my Social Security?

No. South Carolina does not tax Social Security benefits at the state level. You will not owe South Carolina income tax on any amount of Social Security you receive, regardless of your total income or filing status.

What is the difference between the $25,000 and $34,000 thresholds?

If your combined income is between $25,000 and $34,000 (single), up to 50 percent of your benefits are taxable. If it exceeds $34,000, up to 85 percent are taxable. The thresholds for married filing jointly are $32,000 and $44,000. Combined income is your adjusted gross income plus nontaxable interest plus half your Social Security benefit.

Can I reduce my taxable Social Security by withdrawing less from my retirement accounts?

Yes. Since retirement account distributions count toward combined income, taking smaller distributions in a given year can lower your combined income and reduce the amount of Social Security that becomes taxable. Some retirees use this strategy to stay below a threshold year to year.

What if I receive both Social Security and a pension?

Both count toward combined income. If your pension and Social Security together push your combined income above a threshold, part of your Social Security becomes taxable federally. South Carolina does not tax either the pension or the Social Security.

Do I need to file a federal return if I only receive Social Security?

Only if your combined income exceeds the filing threshold for your age and status, which changes each year. If your only income is Social Security and your combined income is below $25,000 (single), you likely do not need to file. If you have other income, you may need to file even if your Social Security is not taxable.