Whether your Social Security is taxed depends on your total income, not just the benefit itself
Social Security benefits may or may not be taxable, depending on how much other income you receive. The IRS uses a formula called combined income to decide. If your combined income stays below a certain threshold, your benefits are not taxed. If it rises above that threshold, up to 85 percent of your benefits can become taxable income on your federal return.
This is different from how most income works. You do not pay tax on the benefit itself first, then get a refund. Instead, the IRS looks at your total picture and tells you retroactively whether any of it counts as taxable. That is why many people do not realize they owe tax on benefits until they file their return or receive a notice.
Key Takeaways
- Combined income is calculated as your adjusted gross income plus nontaxable interest plus half your Social Security benefit, and the IRS uses this number to determine if any benefits are taxable.
- If you are single and your combined income is under $25,000, your benefits are not taxed; between $25,000 and $34,000, up to 50 percent may be taxed; above $34,000, up to 85 percent may be taxed.
- If you are married filing jointly, the thresholds are $32,000 and $44,000 respectively, with the same tax brackets.
- Income from pensions, wages, interest, dividends, rental property, and self-employment all count toward combined income, but Supplemental Security Income (SSI) does not.
- You can request the IRS withhold tax from your benefit check each month to avoid owing a large amount at tax time.
How the IRS calculates combined income
Combined income is not the same as your total income. The IRS builds it in three parts. First, take your adjusted gross income (AGI) — the number at the bottom of your tax return before you claim the standard deduction. Second, add any nontaxable interest you received, such as interest from municipal bonds. Third, add half of your Social Security benefit for the year.
That sum is your combined income. The IRS then compares it to two thresholds. For a single filer, the first threshold is $25,000 and the second is $34,000. For married couples filing jointly, they are $32,000 and $44,000. For married people filing separately, the threshold is $0 — meaning almost all benefits are taxable if you file that way.
Example: You are single and receive $18,000 in Social Security for the year. You also have $12,000 in pension income. Your AGI is $12,000. You have no nontaxable interest. Half your benefit is $9,000. Combined income is $12,000 plus $9,000 = $21,000. Since $21,000 is below $25,000, none of your benefits are taxed.
Another example: You are single with $18,000 in Social Security and $20,000 in pension income. Your AGI is $20,000, half your benefit is $9,000. Combined income is $29,000. Since $29,000 is between $25,000 and $34,000, up to 50 percent of your benefits may be taxed. The actual amount depends on a formula, but you could owe tax on roughly $2,000 to $4,500 of your $18,000 benefit.
What income counts and what does not
Wages, self-employment income, pensions, annuities, interest, dividends, capital gains, and rental income all count toward combined income. If you work part-time or have a side business, that income pushes your combined income higher and may trigger taxation of your benefits.
Supplemental Security Income (SSI) does not count. Veterans benefits do not count. Railroad Retirement benefits do not count. Gifts and inheritances do not count. Money you withdraw from a traditional IRA or 401(k) does count, even if you do not need the money — the withdrawal itself is income.
Roth IRA withdrawals are more complex. The withdrawal itself does not count as income, but if you convert a traditional IRA to a Roth, the conversion amount counts as income and can trigger taxation of your benefits. This is a common surprise for people managing retirement accounts.
The tax brackets for Social Security benefits
| Filing Status | Combined Income Below | Combined Income Between | Combined Income Above | Tax on Benefits |
|---|---|---|---|---|
| Single | $25,000 | $25,000–$34,000 | $34,000 | None / Up to 50% / Up to 85% |
| Married Filing Jointly | $32,000 | $32,000–$44,000 | $44,000 | None / Up to 50% / Up to 85% |
| Married Filing Separately | $0 | N/A | Any amount | Up to 85% |
The thresholds have not changed since 1984. Congress has not adjusted them for inflation, so more people fall into the taxable range each year as their income grows. A person with a modest pension and Social Security who was not taxed ten years ago may be taxed now, even if their actual spending power has not increased.
Because the thresholds are fixed, the number of Social Security recipients paying tax on their benefits has grown steadily. In 1984, about 10 percent of beneficiaries paid tax on their benefits. Today, roughly 56 percent of beneficiaries have some portion of their benefits taxed, according to the Social Security Administration.
How much of your benefit actually gets taxed
The tax is not a flat percentage. It follows a two-step formula. First, the IRS calculates how much of your benefit exceeds the lower threshold. Then it calculates how much exceeds the upper threshold. The amount in the middle is taxed at 50 percent; the amount above the upper threshold is taxed at 85 percent.
If your combined income is between the first and second threshold, up to 50 percent of your benefits can be taxed. If it is above the second threshold, the taxable amount is the smaller of (a) 85 percent of your benefits, or (b) 85 percent of the amount your combined income exceeds the upper threshold, plus 50 percent of the amount between the thresholds. The formula is complicated, but the result is that no more than 85 percent of your total benefit is ever taxed.
You do not pay 85 percent tax on the benefit. You pay your normal income tax rate (10 percent, 12 percent, 22 percent, etc.) on the portion of the benefit that counts as taxable income. If you are in the 12 percent bracket and $5,000 of your benefit is taxable, you owe roughly $600 in federal tax on that amount.
Withholding tax from your benefit check
You can ask the Social Security Administration to withhold federal income tax from your benefit check each month. This prevents a large tax bill at the end of the year. You do this by completing Form W-4V and submitting it to your local Social Security office or mailing it to the address on the form.
On the form, you choose a withholding rate: 7 percent, 10 percent, 15 percent, or 25 percent of your monthly benefit. You can change your withholding at any time by submitting a new form. If you have other income and expect to owe tax, withholding from Social Security can help you break even at tax time instead of owing a lump sum.
Withholding is voluntary. If you do not withhold, you are responsible for paying estimated tax on your own, either through quarterly payments to the IRS or by setting aside money to pay when you file your return. Many people find that withholding a small amount each month is easier than managing a large payment later.
State income tax on Social Security
Most states do not tax Social Security benefits. However, Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont tax at least some benefits for higher-income residents. The rules vary by state — some use the same federal thresholds, others use different ones.
If you live in one of these states and your combined income is high enough, you may owe both federal and state tax on your benefits. Check your state's tax authority website or contact a tax professional in your state to understand your specific situation. Some states offer exemptions for lower-income beneficiaries even though they tax higher-income ones.
Frequently Asked Questions
Do I have to file a tax return if my only income is Social Security?
Not necessarily. If Social Security is your only income and none of it is taxable, you do not have to file. However, if you have other income or if some of your benefits are taxable, you must file. The IRS publishes income thresholds each year for who must file; check the current year's threshold on IRS.gov.
What if I did not know my benefits were taxable and did not pay tax?
The IRS will send you a notice. You can file an amended return (Form 1040-X) for prior years, usually going back three years. If you owe tax, you will also owe interest and possibly penalties, though the IRS sometimes waives penalties if you show reasonable cause. Contact a tax professional or the IRS directly if you receive a notice.
Can I reduce my combined income to avoid taxation of my benefits?
Some strategies exist but are limited. Delaying Social Security past your full retirement age increases your monthly benefit but does not change whether it is taxed. Contributing to a traditional IRA reduces your AGI, which lowers combined income — but you must have earned income to contribute. Roth conversions increase combined income in the year of conversion. Speak with a tax professional about your specific situation.
Does my spouse's income count toward my combined income threshold?
Only if you file jointly. If you file separately, each person's combined income is calculated independently. However, married people filing separately face much harsher taxation of benefits, so filing jointly is usually better even if one spouse has high income.
Are my benefits taxed if I still work?
Wages from work count as income and are included in your combined income calculation. If you work and receive Social Security, your combined income is likely higher, which may trigger taxation of your benefits. Additionally, if you have not reached full retirement age, Social Security reduces your benefit by $1 for every $2 you earn above an annual limit (the limit changes yearly). Once you reach full retirement age, the earnings limit no longer applies.