Whether your Social Security is taxed depends on your other income
Not all of your Social Security check is automatically taxable. The amount you owe tax on depends on your combined income — which includes wages, pensions, interest, dividends, and half of your Social Security benefits. If your combined income stays below certain thresholds, you pay no federal tax on Social Security at all. If it goes above those thresholds, you may owe tax on 50% or 85% of your benefits.
The thresholds are the same whether you are single or married filing jointly, but married couples filing separately face much stricter rules. These thresholds have not changed since 1984, so even small amounts of other income can push you over the line.
Key Takeaways
- Combined income is calculated as your adjusted gross income plus nontaxable interest plus half your Social Security benefits.
- If your combined income is below $25,000 (single) or $32,000 (married filing jointly), none of your Social Security is taxable.
- Between those thresholds and $34,000 (single) or $44,000 (married filing jointly), you may owe tax on up to 50% of your benefits.
- Above $34,000 (single) or $44,000 (married filing jointly), you may owe tax on up to 85% of your benefits.
- State taxes on Social Security vary widely — some states tax it, some do not, and some exempt it only if you are over a certain age.
How the IRS calculates your combined income
The IRS uses a specific formula to determine whether your Social Security is taxable. Start with your adjusted gross income (AGI) — the number on line 11 of your Form 1040. Add to that any nontaxable interest you received, such as interest from municipal bonds. Then add half of your Social Security benefits for the year.
That total is your combined income. It is the only number that matters for this calculation. For example, if you have an AGI of $20,000, nontaxable interest of $2,000, and received $18,000 in Social Security, your combined income is $20,000 + $2,000 + (½ × $18,000) = $29,000.
The income thresholds that determine how much is taxed
The IRS uses two thresholds. If your combined income is below the first threshold, none of your Social Security is taxable. If it falls between the first and second threshold, up to 50% of your benefits may be taxable. If it exceeds the second threshold, up to 85% of your benefits may be taxable.
| Filing Status | First Threshold | Second Threshold |
|---|---|---|
| Single | $25,000 | $34,000 |
| Married filing jointly | $32,000 | $44,000 |
| Married filing separately | $0 | $0 |
Married couples filing separately almost always owe tax on their Social Security, even with very low income. If you and your spouse have filed separately in past years, talk to a tax professional about whether filing jointly might lower your tax burden.
What happens when you cross the first threshold
If your combined income exceeds the first threshold but stays below the second, the IRS taxes the lesser of two amounts: either 50% of your Social Security benefits, or 50% of the amount by which your combined income exceeds the first threshold.
Using the earlier example: combined income of $29,000, first threshold of $25,000. The excess is $4,000. Half of that is $2,000. Half of your $18,000 in benefits is $9,000. The IRS taxes the smaller number: $2,000. You would owe tax on $2,000 of your $18,000 Social Security check.
What happens when you cross the second threshold
If your combined income exceeds the second threshold, the calculation is more complex. You owe tax on the greater of two amounts: either 85% of your benefits, or the sum of (1) 85% of the amount by which your combined income exceeds the second threshold, plus (2) the smaller of the two amounts from the first threshold calculation.
This is where a tax professional becomes useful. The math is correct, but it is straightforward to make mistakes. If you are over the second threshold, consider having a tax preparer or CPA handle this part of your return, or use tax software that walks you through the calculation step by step.
State taxes on Social Security
Thirteen states tax Social Security benefits: Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, Vermont, and West Virginia. The rules vary by state — some use the same federal thresholds, some use different ones, and some exempt benefits if you are over a certain age (often 59½ or 62).
If you live in one of these states, contact your state tax authority or a tax professional to understand how your state treats your benefits. The federal tax calculation does not automatically tell you what you owe in state tax.
How to report Social Security on your tax return
Social Security benefits appear on Form SSA-1099, which you receive by January 31 each year. You report the amount shown on that form on line 5a of your Form 1040. If any of your benefits are taxable, you report the taxable portion on line 5b.
If you use tax software, it will ask you for the total from box 5 of your SSA-1099 and walk you through the combined income calculation. If you file by hand or work with a tax preparer, bring your SSA-1099 and documentation of any other income sources, including nontaxable interest.
Frequently Asked Questions
Can I reduce my taxable Social Security by lowering my other income?
Yes. Because combined income determines whether you are taxed, reducing other income sources can move you below a threshold. For example, if you are close to the first threshold, delaying a pension payment or charitable withdrawal from a retirement account to the next year might keep you below it. A tax professional can model different scenarios for you.
Does Medicare premium surcharge count toward the combined income threshold?
No. Your Medicare premiums are deducted from your Social Security check, but they do not affect the combined income calculation. The thresholds are based only on income, not on what you pay for insurance.
What if I worked and received Social Security in the same year?
Both your wages and your Social Security count toward combined income. If you are under full retirement age and still working, you may also have earnings withheld from your Social Security check itself — but that is a separate rule from taxation. Report both your wages and your full Social Security benefit on your tax return.
Do I have to file a tax return if only my Social Security income is taxable?
Not necessarily. You only have to file if your total income exceeds the standard deduction for your age and filing status. However, if tax was withheld from your Social Security check, you may want to file to get a refund. Check the IRS website or ask a tax professional whether you are required to file.
What if the IRS made a mistake on my SSA-1099?
Contact Social Security directly to report the error. You can call 1-800-772-1213 or visit your local Social Security office with your SSA-1099 and documentation of the correct amount. Social Security will issue a corrected form, which you can then use to file an amended tax return if needed.