Whether the IRS taxes your Social Security depends on your other income
The IRS taxes Social Security benefits for some people and not for others. The deciding factor is your combined income — not just what you receive from Social Security, but also wages, interest, dividends, and other sources added together. 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 percent of your benefits become taxable.
The thresholds are the same whether you file single or married filing jointly, but married couples filing separately face a much lower threshold. These thresholds have not changed since 1984, so they affect more people each year as incomes rise.
Key Takeaways
- Combined income is calculated by adding your adjusted gross income, nontaxable interest, and half your Social Security benefits together.
- Single filers with combined income under $25,000 and married filing jointly filers under $32,000 owe no federal tax on Social Security.
- Between $25,000 and $34,000 for single filers (or $32,000 to $44,000 for married filing jointly), up to 50 percent of benefits become taxable.
- Above $34,000 for single filers (or $44,000 for married filing jointly), up to 85 percent of benefits become taxable.
- State income tax on Social Security varies by state; some states do not tax it at all, while others follow federal rules.
How the IRS calculates combined income
Combined income is not the same as your adjusted gross income (AGI). The IRS starts with your AGI, then adds back certain deductions and adds in nontaxable interest. The formula is: AGI plus nontaxable interest plus half of your Social Security benefits.
Nontaxable interest includes interest from municipal bonds and certain other tax-exempt securities. If you have very little income besides Social Security, your combined income might be just half your benefits. If you have a pension, part-time work, or investment income, those amounts push your combined income higher and can trigger taxation of your benefits.
The income thresholds where taxation begins
The IRS uses two thresholds for each filing status. The first threshold determines whether any of your benefits are taxable at all. The second threshold determines whether you hit the 85 percent cap.
| Filing Status | First Threshold (50% taxable) | Second Threshold (85% taxable) |
|---|---|---|
| Single | $25,000 | $34,000 |
| Married filing jointly | $32,000 | $44,000 |
| Married filing separately | $0 | $0 |
Married couples filing separately almost always face taxation on their benefits, because the thresholds are essentially zero. The IRS treats this filing status as a penalty for couples who do not file jointly.
How much of your benefits become taxable
If your combined income falls between the first and second threshold, the IRS taxes up to 50 percent of your benefits. The exact amount depends on how far above the first threshold you are. You calculate this by taking the amount your combined income exceeds the first threshold, multiplying by 50 percent, and comparing that to half your total benefits. Whichever is smaller is the amount that becomes taxable.
If your combined income exceeds the second threshold, the calculation becomes more complex. The IRS taxes up to 85 percent of your benefits. In practice, this means that for every dollar of combined income above the second threshold, roughly 85 cents of additional Social Security becomes taxable (up to the 85 percent cap). Combined with the amount taxed between the first and second threshold, you could owe tax on a significant portion of your benefits.
The IRS publishes a worksheet in the instructions to Form 1040 that walks through this calculation step by step. Many tax software programs calculate this automatically once you enter your Social Security amount.
State income tax on Social Security
Thirteen states tax Social Security benefits 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 states follow the federal thresholds exactly. Others use different thresholds or tax a different percentage of benefits. A few states exempt benefits for residents over a certain age.
Thirty-seven states do not tax Social Security benefits at all. If you live in one of those states, you only owe federal tax on your benefits (if your combined income is high enough). If you live in a state that does tax benefits, you will need to check your state's tax forms or contact your state revenue department to understand how much you owe.
Withholding and estimated tax payments
If your Social Security benefits are taxable, you have two options: you can request that the Social Security Administration withhold federal income tax from your monthly payment, or you can make estimated tax payments to the IRS four times per year.
To request withholding, you fill out Form W-4V and send it to your local Social Security office. You can choose to have 7, 10, 12, or 22 percent of your benefit withheld each month. Many people choose this route because it is simpler than calculating and paying estimated taxes on your own.
If you prefer not to have taxes withheld, you can make quarterly estimated tax payments using Form 1040-ES. This requires you to predict your income for the year and send payments to the IRS in April, June, September, and January. Underpaying estimated taxes can result in penalties, so this route works best if your income is stable and predictable.
What happens if you do not pay tax on taxable benefits
If you owe tax on your Social Security benefits and do not pay it, the IRS will assess penalties and interest on the unpaid amount. The penalty for underpayment of estimated tax is calculated based on how late the payment was and the current interest rate. Interest compounds daily.
If you discover you owed tax in a prior year and did not pay it, you can file an amended return using Form 1040-X. The IRS will calculate any penalties and interest owed. Filing an amended return voluntarily is better than waiting for the IRS to contact you, because it shows good faith and may reduce penalties in some cases.
Frequently Asked Questions
Can I reduce my combined income to avoid taxation of my Social Security?
Some strategies can lower combined income, such as delaying claiming Social Security until a later age or reducing investment income by repositioning assets. However, these decisions have long-term consequences and depend on your personal situation. A tax professional or financial advisor can discuss whether any strategy makes sense for you.
Does my spouse's income count toward my combined income threshold?
No. If you file separately, only your income counts. If you file jointly, the IRS adds both spouses' incomes together to determine whether benefits are taxable, but each spouse's benefits are evaluated using the combined household income. This is one reason married couples usually benefit from filing jointly rather than separately.
What if I worked while receiving Social Security before full retirement age?
Earnings from work before you reach full retirement age reduce your Social Security benefit that year, but they also count toward your combined income for tax purposes. This can trigger taxation of your benefits even if the reduced benefit amount is small. Once you reach full retirement age, earnings no longer reduce your benefit, but they still count toward combined income.
Do I have to report Social Security income if none of it is taxable?
You must report your total Social Security income on your tax return even if none of it is taxable. The IRS uses this information to verify that you reported the correct amount and to cross-check with the Social Security Administration's records. Form SSA-1099 shows the amount you received; you report this on Form 1040.
How do I know if my state taxes Social Security?
Contact your state's department of revenue or visit its website. Many states publish a tax guide that explains Social Security taxation rules. If you live in a state that taxes benefits, you may be able to claim a credit on your federal return for state taxes paid on Social Security, though this depends on your specific situation.