Whether your Social Security is taxed depends on your total income, not just what you receive from Social Security
The IRS taxes Social Security benefits for some people but not others, based on a calculation called combined income. Combined income is half your Social Security benefit plus all your other income — wages, pensions, interest, dividends, and withdrawals from retirement accounts. If that number exceeds a threshold set by the IRS, a portion of your benefits becomes taxable income on your federal return.
The thresholds are $25,000 for single filers and $32,000 for married couples filing jointly. These numbers have not changed since 1984, which means more people cross them each year as wages and investment returns rise. If you are below the threshold, you owe no federal tax on your Social Security. If you are above it, you may owe tax on up to 85 percent of your benefits.
State taxes on Social Security vary widely. Some states tax it the same way the federal government does. Others do not tax it at all. A few tax it only for higher-income retirees. You need to check your state's rules separately.
Key Takeaways
- Combined income — half your Social Security plus all other income — determines whether benefits are taxable, not your Social Security amount alone.
- If combined income exceeds $25,000 (single) or $32,000 (married filing jointly), up to 85 percent of your benefits may be subject to federal tax.
- State tax treatment of Social Security varies: some states do not tax it, others tax it like the federal government, and a few tax only higher-income recipients.
- You can reduce combined income by delaying benefits, withdrawing less from retirement accounts, or managing investment sales in the year you claim.
How to calculate your combined income
Start with your adjusted gross income (AGI) from your tax return. This includes wages, self-employment income, pensions, interest, dividends, capital gains, and withdrawals from traditional IRAs or 401(k)s. It does not include Roth IRA withdrawals (the principal portion) or municipal bond interest, which the IRS treats as nontaxable.
Add back any deductions you took for student loan interest or IRA contributions. Then add half of your Social Security benefit for the year. The result is your combined income.
Example: You received $20,000 in Social Security, earned $15,000 in part-time wages, and had $3,000 in interest income. Your AGI is $18,000. Half your Social Security is $10,000. Combined income is $18,000 + $10,000 = $28,000. Since $28,000 exceeds $25,000 (the single threshold), some of your benefits are taxable.
The two-tier tax formula
The IRS uses two tiers to determine how much of your benefit is taxable. The first tier applies to combined income above the initial threshold ($25,000 single, $32,000 married). The second tier applies to combined income above a higher threshold ($34,000 single, $44,000 married).
At the first tier, you pay tax on the lesser of (a) 50 percent of the amount by which your combined income exceeds the initial threshold, or (b) 50 percent of your total Social Security benefit. At the second tier, you pay tax on the lesser of (a) 85 percent of the amount by which your combined income exceeds the higher threshold, or (b) 85 percent of your total benefit, minus any tax already owed at the first tier.
The math is complex, which is why the IRS Worksheet in Publication 915 walks through it step by step. Most tax software calculates this automatically if you enter your Social Security income and other income correctly.
What counts as income for this calculation
| Income Type | Counts Toward Combined Income |
|---|---|
| Wages and self-employment income | Yes |
| Pension or annuity payments | Yes |
| Interest and dividends | Yes |
| Capital gains (long and short term) | Yes |
| Traditional IRA or 401(k) withdrawals | Yes |
| Roth IRA withdrawals (principal) | No |
| Municipal bond interest | No |
| Veterans benefits | No |
| Supplemental Security Income (SSI) | No |
| Gifts or inheritances | No |
Ways to reduce taxable Social Security
If you are close to or above the threshold, you have options to lower your combined income. Delaying your Social Security claim reduces the annual benefit amount you receive, which lowers combined income in the years before you claim. Each year you delay past your full retirement age increases your benefit by about 8 percent, and the higher amount is permanent.
You can also manage retirement account withdrawals. If you are taking money from a traditional IRA or 401(k), consider whether you can reduce the amount or spread withdrawals across multiple years. Roth conversions in one year increase income that year but may lower it in future years. Timing the sale of investments to avoid large capital gains in a single year can also help.
If you are still working, earned income counts toward combined income, so reducing work hours or delaying work until after you claim Social Security may lower your tax burden. Some people coordinate their claiming age with their retirement date for this reason.
State tax treatment of Social Security
Thirteen states tax Social Security benefits in some form: Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, Vermont, and West Virginia. The rules differ in each state.
Some states use the same federal thresholds and formulas. Others have their own thresholds, which may be higher or lower. A few states tax only benefits received by people above a certain income level, exempting lower-income retirees. Colorado, for example, taxes benefits only for people with federal adjusted gross income above $25,000 (single) or $32,000 (married), but then exempts the first $20,000 of benefits from state tax.
Contact your state tax authority or review your state's tax guide to learn the exact rules. Many state revenue departments publish a worksheet or calculator for Social Security taxation.
Frequently Asked Questions
Do I have to pay estimated tax on Social Security?
If you expect to owe tax on your benefits, you can have it withheld from your Social Security check or make quarterly estimated tax payments. Form W-4V lets you request withholding. Most people find withholding simpler than quarterly payments.
What if I made a mistake on my tax return and didn't report Social Security correctly?
You can file an amended return using Form 1040-X for any year within three years of the original due date. The IRS may assess additional tax, interest, and penalties if the error was substantial, but correcting it stops further interest from accruing.
Does my spouse's income affect whether my Social Security is taxed?
If you file jointly, yes — combined income includes both spouses' income. If you file separately, each spouse's combined income is calculated individually, though filing separately usually results in more tax overall.
Are there any Social Security benefits that are never taxed?
Supplemental Security Income (SSI) is never taxed. Tier 1 Railroad Retirement benefits follow Social Security rules. Tier 2 benefits are taxed differently. If you receive both Social Security and railroad retirement, the rules are complex — consult a tax professional.
Can I use a calculator to figure this out myself?
The IRS Worksheet in Publication 915 is the official method. Tax software usually calculates it automatically. If your situation is straightforward — you have only Social Security, a pension, and interest income — the worksheet takes 10 to 15 minutes. If you have capital gains, multiple retirement accounts, or live in a state that taxes benefits, a tax professional can save time and money.