Whether your Social Security is taxed depends on your other income
Social Security income may or may not be taxed, depending on how much other income you have. The IRS uses a formula based on your combined income — not just your Social Security check. If your combined income stays below a certain threshold, you pay no federal tax on Social Security. If it exceeds that threshold, between 50% and 85% of your benefits become taxable.
Combined income means your adjusted gross income plus nontaxable interest plus half of your Social Security benefits. This is the number that determines your tax liability, and it's the same calculation whether you're single, married filing jointly, or married filing separately.
Key Takeaways
- Combined income thresholds are $25,000 for single filers and $32,000 for married couples filing jointly; income above these amounts triggers taxation of Social Security benefits.
- The percentage of benefits taxed ranges from 50% to 85% depending on how far your combined income exceeds the threshold.
- Combined income includes your wages, pensions, investment income, and half of your Social Security benefits — not just your Social Security alone.
- Some states do not tax Social Security income at all, even if the federal government does, so your state tax liability may be different.
- You can request that the Social Security Administration withhold taxes from your monthly check to avoid a large bill at tax time.
The income thresholds that trigger taxation
The IRS sets two thresholds. If your combined income is below the first threshold, no part of your Social Security is taxable. If it exceeds the first threshold but stays below the second, up to 50% of your benefits are taxable. If it exceeds the second threshold, up to 85% of your benefits are taxable.
For single filers, the first threshold is $25,000 and the second is $34,000. For married couples filing jointly, the first threshold is $32,000 and the second is $44,000. Married people filing separately face a much lower threshold of $0, meaning almost all of their Social Security is taxable.
These thresholds have not changed since 1984, even though the cost of living has risen significantly. This means more people cross into taxable territory each year simply because their other income has kept pace with inflation.
How to calculate your combined income
Combined income is not the same as your total income. Start with your adjusted gross income (AGI) — the number from line 11 of your 1040 tax form. 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.
The result is your combined income. Use this number to check against the thresholds above. If you're unsure of your AGI, look at last year's tax return or use your most recent pay stubs and 1099 forms to estimate it.
Example: You're single with $20,000 in pension income, $3,000 in dividend income, and $18,000 in Social Security benefits. Your AGI is $23,000. Half your Social Security is $9,000. Combined income is $23,000 + $9,000 = $32,000. This exceeds the $25,000 threshold, so some of your benefits are taxable.
How much of your benefits becomes taxable
Once your combined income exceeds a threshold, the IRS uses a two-step calculation to determine how much of your benefits you owe tax on.
If your combined income exceeds the first threshold ($25,000 single / $32,000 married filing jointly), take the amount over the threshold and multiply it by 50%. The result is the amount of benefits subject to tax, up to a maximum of 50% of your total benefits. This is the "first tier" of taxation.
If your combined income also exceeds the second threshold ($34,000 single / $44,000 married filing jointly), the calculation becomes more complex. The excess over the second threshold is multiplied by 85%, and you add back any amount already taxed under the first tier. The total taxable amount cannot exceed 85% of your benefits.
The IRS publishes a worksheet each year to walk through this calculation. It's included in the instructions for Form 1040 and in IRS Publication 915.
State taxes on Social Security income
Thirteen states tax Social Security income to some degree: Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, Vermont, and West Virginia. The rules vary by state — some tax it the same way the federal government does, while others have their own thresholds or exclude it entirely for certain age groups.
Most states do not tax Social Security at all. If you live in one of the thirteen that do, check your state's tax agency website for the specific rules that apply to you. Some states offer exemptions based on age or income level, so you may owe state tax even if you owe nothing to the federal government, or vice versa.
Withholding taxes from your Social Security check
You can ask the Social Security Administration to withhold federal income tax from your monthly benefit payment. This is optional, but it can help you avoid a large tax bill when you file your return.
To set up withholding, complete Form W-4V (Voluntary Withholding Request) and submit it to your local Social Security office, by mail, or online through your my Social Security account. You can choose to have 7%, 10%, 12%, or 22% of your benefit withheld each month, or you can request a flat dollar amount.
Withholding does not reduce the amount of your benefits that is taxable — it only reduces the amount you owe when you file. If you expect to owe taxes, withholding can make it easier to manage the payment throughout the year instead of facing a lump sum in April.
What happens if you work and receive Social Security
If you are under full retirement age and still working, the Social Security Administration reduces your benefits by $1 for every $2 you earn above an annual limit. This reduction is separate from income tax and affects how much you receive each month.
However, the earnings that trigger this reduction also count toward your combined income for tax purposes. This means working while receiving Social Security can push you into a higher tax bracket on your benefits even if your total income has not changed.
Once you reach full retirement age, the earnings limit no longer applies, and you receive your full benefit amount. Your combined income calculation remains the same.
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 it falls below the filing threshold for your age and filing status, you do not have to file. However, if you had taxes withheld from your benefits or you have other income, filing may allow you to claim a refund or other credits.
Can I reduce my taxable Social Security by lowering my other income?
Yes. Since combined income determines taxation, reducing your other income — for example, by delaying a pension payment or managing investment sales — can lower the amount of your benefits that is taxable. Some people time large withdrawals or charitable donations to manage this.
What if I received Social Security benefits for only part of the year?
You still use the full-year thresholds to determine whether any of your benefits are taxable. The calculation is based on your combined income for the entire year, not the portion of the year you received benefits.
Does the taxation of Social Security affect my Medicare premiums?
No. Medicare premiums are based on your modified adjusted gross income (MAGI), which is calculated differently than the combined income used for Social Security taxation. However, higher income can trigger higher Medicare Part B and Part D premiums through a separate mechanism called income-related monthly adjustment amounts (IRMAA).
If I'm married filing separately, is there any way to avoid the $0 threshold?
No. The IRS treats married people filing separately as having a $0 threshold for Social Security taxation, meaning nearly all benefits are taxable. Filing jointly, if you're may be able to access, results in a much higher threshold and typically lower overall taxes.