Whether you pay income tax on Social Security depends on your total income, not just what you receive from Social Security

The Social Security Administration does not withhold federal income tax automatically from your benefits. Instead, the IRS uses a calculation called combined income to decide whether your benefits are taxable. Combined income adds your adjusted gross income, nontaxable interest, and half of your Social Security benefits. If that total exceeds a certain threshold, you owe federal income tax on a portion of your benefits — not necessarily all of them.

The thresholds are $25,000 for single filers and $32,000 for married couples filing jointly. These numbers have not changed since 1984. If your combined income falls below these thresholds, you pay no federal income tax on your Social Security. If it exceeds them, you may owe tax on up to 50 percent or 85 percent of your benefits, depending on how far above the threshold you are.

State income tax is a separate question. Thirteen states tax Social Security benefits under their own rules: Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, Vermont, and West Virginia. The rules vary by state — some tax all benefits, others only tax benefits above a certain income level, and some offer exemptions based on age or income. If you live in one of these states, you may owe state tax even if you owe no federal tax.

Key Takeaways

  • Federal income tax on Social Security is based on combined income (your income plus half your benefits), not on Social Security alone.
  • If your combined income is below $25,000 (single) or $32,000 (married filing jointly), you owe no federal income tax on benefits.
  • Thirteen states tax Social Security benefits under their own rules, which differ from federal rules and from each other.
  • The IRS does not automatically withhold tax from Social Security, so you may need to pay estimated tax or adjust withholding from other income.
  • You report Social Security income on Form 1040 using the worksheet in the instructions, not by straightforward adding the full amount to your income.

How the IRS calculates whether your benefits are taxable

Start with your adjusted gross income (AGI) — the number on line 11 of your Form 1040. Add any nontaxable interest you earned, such as interest from municipal bonds. Then add half of the Social Security benefits you received during the year. That total is your combined income.

If combined income is $25,000 or less (single) or $32,000 or less (married filing jointly), stop. You owe no federal income tax on your benefits. If combined income exceeds the threshold, use the IRS worksheet in the Form 1040 instructions to calculate how much of your benefits are taxable. The worksheet accounts for the excess over the threshold and applies a formula that taxes either 50 percent or 85 percent of your benefits, depending on how much you exceed the threshold.

The Social Security Administration sends you a Form SSA-1099 each January showing the total benefits you received in the previous year. Use that number when you calculate combined income. If you received benefits from more than one source (for example, your own retirement and a survivor benefit), add them together.

The difference between the 50 percent and 85 percent tax brackets

The IRS applies a two-tier system. The first tier taxes up to 50 percent of your benefits. The second tier taxes up to an additional 35 percent of your benefits, for a maximum of 85 percent total.

You enter the first tier when your combined income exceeds the base threshold ($25,000 single or $32,000 married filing jointly). The amount of benefits taxed in this tier is the lesser of (1) half your benefits or (2) half the amount by which your combined income exceeds the threshold.

You enter the second tier when your combined income exceeds a higher threshold: $34,000 for single filers or $44,000 for married couples filing jointly. The amount taxed in this tier is the lesser of (1) 85 percent of your benefits or (2) 85 percent of the amount by which your combined income exceeds the higher threshold, minus any amount already taxed in the first tier.

In practice, very few people pay tax on 85 percent of their benefits. You reach that level only if your combined income is substantially above the higher threshold — typically $50,000 or more for single filers.

States that tax Social Security and how their rules differ

Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, Vermont, and West Virginia all tax Social Security benefits. However, each state uses different thresholds and rules.

Connecticut, Kansas, and Missouri tax Social Security the same way the federal government does, using combined income and the same thresholds. Colorado, Minnesota, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont use their own income thresholds, which are often higher than the federal thresholds. Some states exempt benefits for people over a certain age — for example, Vermont exempts all Social Security for residents 62 and older. West Virginia taxes Social Security as regular income with no special calculation.

If you live in one of these states, your state tax return will include a worksheet or schedule for Social Security income. The instructions for your state return explain which benefits are taxable under state law. If you moved to a different state during the year, you may owe tax to both states, depending on when you moved and each state's rules.

How to handle withholding and estimated tax payments

The Social Security Administration does not withhold federal income tax from your benefits unless you request it. If you know you will owe tax on your benefits, you have two options: request withholding from your Social Security check, or make estimated tax payments to the IRS.

To request withholding, complete Form W-4V (Voluntary Withholding Request) and send it to your local Social Security office or mail it to the address on the form. You can request that 7, 10, 15, or 25 percent of your benefit be withheld. The Social Security Administration will begin withholding the following month. You can change or stop withholding at any time by submitting a new Form W-4V.

If you have other income — from a job, a pension, or investments — you can also adjust the withholding on that income using Form W-4 (for wages) or Form W-4P (for pensions). This may be simpler if you already have withholding set up elsewhere.

Alternatively, you can make quarterly estimated tax payments directly to the IRS using Form 1040-ES. Estimated payments are due April 15, June 15, September 15, and January 15. If you underpay, the IRS may charge a penalty, though the penalty is usually small if you pay at least 90 percent of your current year tax or 100 percent of your prior year tax.

What happens if you do not withhold or pay estimated tax

If you owe tax on your Social Security benefits and do not withhold or pay estimated tax, you will owe the full amount when you file your return. The IRS will charge interest on the unpaid tax from the due date of your return (April 15) until you pay. If you owe more than $1,000, the IRS may also charge an underpayment penalty, calculated quarterly based on how much you underpaid each quarter.

The penalty is usually 4 to 8 percent per year, depending on current interest rates. For example, if you owe $2,000 in tax and do not pay until you file your return in April, you might owe $80 to $160 in penalty and interest combined. Requesting withholding or making estimated payments avoids this penalty.

If you cannot pay the full amount when you file, the IRS offers payment plans. You can set up an agreement to pay in installments, though interest and penalties continue to accrue until the balance is paid in full.

How to report Social Security on your tax return

You report Social Security benefits on Form 1040, lines 5a and 5b. Line 5a is the total benefits you received (from your Form SSA-1099). Line 5b is the taxable portion, which you calculate using the worksheet in the Form 1040 instructions.

Do not straightforward add your full Social Security benefit to your other income. The worksheet accounts for the fact that only a portion of your benefits may be taxable. If your combined income is below the threshold, line 5b will be zero, and you enter zero on line 5b even though you received benefits.

If you use tax software, the software will walk you through the worksheet and calculate line 5b for you. If you prepare your return by hand, follow the worksheet step by step. The worksheet is in the Form 1040 instructions under "Social Security Benefits".

Frequently Asked Questions

Can I reduce my combined income to avoid paying tax on Social Security?

You can reduce your combined income by reducing your adjusted gross income, but the effect is limited because half your Social Security benefits are always counted. For example, if you have $5,000 in deductible IRA contributions, your combined income drops by $5,000, which may lower your taxable benefits by up to $2,500. Strategies like Roth conversions or charitable giving may affect your combined income, but you should discuss these with a tax professional to understand the full impact.

What if I worked and received Social Security in the same year?

Wages are part of your adjusted gross income, which increases your combined income and may make your benefits taxable. If you are under full retirement age and still working, you also face the earnings test: Social Security reduces your benefits by $1 for every $2 you earn above $23,400 (in 2024, though this amount changes yearly). The earnings test stops the month you reach full retirement age. Once you reach full retirement age, you can earn any amount without affecting your benefits.

Do I have to pay tax on Supplemental Security Income (SSI)?

No. Supplemental Security Income is not taxable income. Only Social Security retirement, survivor, and disability benefits are subject to the tax rules described here. If you receive both SSI and Social Security, only the Social Security portion counts toward combined income.

What if I received a large bonus or sold an investment in the same year I started Social Security?

That income counts toward your adjusted gross income and increases your combined income, which may make all or most of your benefits taxable. If the large income is one-time only, you might consider spreading it across multiple years if possible — for example, by deferring a bonus to the next year or staggering the sale of an investment. A tax professional can help you plan for this.

Will my state tax my Social Security if I move?

It depends on which state you move to and when. If you move to a state that does not tax Social Security, you will not owe state tax on benefits going forward. If you move to a state that does tax Social Security, you will owe tax on benefits received while you lived there. Some states have residency rules — for example, Vermont exempts Social Security for residents 62 and older, so if you move to Vermont after 62, your benefits may be exempt. Check your new state's tax rules or contact the state tax department.