Whether You Owe Tax on Social Security Depends on Your Other Income

Social Security benefits are taxable income, but only if your total income crosses certain thresholds. The IRS uses a formula called combined income to decide how much of your benefit is subject to tax. Combined income is your adjusted gross income plus nontaxable interest plus half of your Social Security benefits for the year.

If your combined income stays below the threshold for your filing status, you owe no federal tax on your benefits. If it exceeds the threshold, you may owe tax on up to 85 percent of your benefits. The thresholds have not changed since 1984, which means more people cross them each year as wages and investment income rise.

State taxes are separate. Some states do not tax Social Security at all. Others tax it the same way the federal government does, and a few have their own rules. Check your state's tax authority website to learn what applies where you live.

Key Takeaways

  • Combined income is adjusted gross income plus nontaxable interest plus half your Social Security benefits; if it stays below your threshold, you owe no federal tax on benefits.
  • The federal thresholds are $25,000 for single filers and $32,000 for married filing jointly; exceeding them may make up to 85 percent of your benefits taxable.
  • You can reduce combined income by earning less, taking fewer withdrawals from retirement accounts, or deferring capital gains to a later year.
  • The IRS Worksheet A or B in Publication 915 walks you through the calculation step by step, and the Social Security Administration's online calculator estimates your tax liability.

The Two Thresholds That Determine Your Tax

The IRS sets two thresholds. If your combined income falls below the first threshold, none of your benefits are taxable. If it exceeds the second threshold, up to 85 percent of your benefits become taxable.

For a single filer, the first threshold is $25,000 and the second is $34,000. For married couples filing jointly, the first is $32,000 and the second is $44,000. Married people filing separately have a first threshold of $0, meaning any combined income at all can trigger taxation.

The amount of your benefit that becomes taxable depends on how far above the first threshold your combined income reaches. The IRS worksheet in Publication 915 calculates this in two steps: first, it determines how much of your benefit is taxable based on the gap between your income and the first threshold. Then it applies a second calculation if your income exceeds the second threshold, which can push the taxable portion higher.

How to Calculate Combined Income Step by Step

Start with your adjusted gross income (AGI) from your tax return. This is your total income minus certain deductions like educator expenses or student loan interest. If you have no income other than Social Security, your AGI is zero.

Add any nontaxable interest you received during the year. This includes interest from municipal bonds and certain other tax-exempt securities. Taxable interest from savings accounts, CDs, and Treasury bonds does not go here—it is already in your AGI.

Add half of your total Social Security benefits for the year. The Social Security Administration sends you a form SSA-1099 in January showing your total benefits. Divide that number by two and add it to the sum above. That total is your combined income.

Once you have combined income, compare it to your threshold. If it is below the threshold for your filing status, you owe no federal tax. If it exceeds the threshold, use IRS Worksheet A or B (both in Publication 915) to calculate the taxable portion of your benefit.

Using the IRS Worksheet to Find Your Taxable Amount

Publication 915, Social Security and Equivalent Railroad Retirement Benefits, contains two worksheets. Use Worksheet A if none of your income came from outside the United States, and use Worksheet B if you have foreign income or certain other situations explore. Both are free to read from IRS.gov.

Worksheet A asks you to enter your combined income, subtract your threshold, and multiply the result by 50 percent. This gives you a tentative amount. Then it asks you to compare this tentative amount to half your total benefits. Whichever is smaller becomes your taxable benefit amount under the first threshold rule.

If your combined income exceeds the second threshold, the worksheet performs a second calculation. It takes the amount by which your income exceeds the second threshold, multiplies it by 85 percent, and adds that to the amount from the first calculation. The result cannot exceed 85 percent of your total benefits.

The worksheet is designed to be worked through line by line. If you find it confusing, the Social Security Administration's online calculator at ssa.gov performs the same calculation and shows you the result without requiring you to do the math yourself.

Ways to Reduce Your Combined Income Before Year End

If you are close to a threshold, reducing your combined income in the current year can lower or eliminate the tax on your benefits. The most direct way is to reduce your adjusted gross income.

If you are still working, earning less in the current year reduces your AGI directly. If you are retired, you control when you take withdrawals from retirement accounts. A withdrawal from a traditional IRA or 401(k) counts as income and raises your combined income. Deferring a withdrawal to the following year moves that income to a year when you may be below the threshold.

Capital gains and losses also affect your AGI. If you are planning to sell investments, timing the sale to fall in a year when your other income is lower can reduce the tax on your benefits. Conversely, if you have capital losses, using them to offset gains in the current year lowers your AGI.

Nontaxable interest is harder to control, but if you hold municipal bonds, you already know they generate nontaxable interest. Bonds purchased in a lower-income year will continue to generate nontaxable interest in future years, so the timing of a bond purchase can matter if you are managing income across multiple years.

What Happens After You Calculate Your Tax

Once you know how much of your benefit is taxable, you report it on your federal tax return. If you file Form 1040, you enter your total Social Security benefits on line 5a and the taxable portion on line 5b. The taxable portion is what gets added to your other income to calculate your total tax.

You can pay this tax in several ways. If you receive your benefits by direct deposit, you can ask the Social Security Administration to withhold federal income tax from your monthly payment. Form W-4V, Voluntary Withholding Request, lets you choose to withhold 7, 10, 15, or 25 percent of your benefit each month. This is the simplest approach if you want to avoid a large bill at tax time.

Alternatively, you can make estimated tax payments to the IRS quarterly if you expect to owe more than $1,000 in tax. Or you can straightforward pay the full amount when you file your return. The method you choose depends on your cash flow and preference for managing the tax throughout the year or all at once.

If you underpay your tax during the year, the IRS may charge a penalty for underpayment of estimated tax. However, if you are over 65 and your only income is Social Security, you may be exempt from this penalty. Check IRS.gov or Publication 915 for the specific rules that explore to your situation.

State Taxes on Social Security Benefits

Thirteen states tax Social Security benefits in some form. Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont all tax benefits using a formula similar to the federal one, though their thresholds and percentages differ. Illinois and Mississippi tax benefits only if you are over a certain age or meet other conditions.

Thirty-seven states and the District of Columbia do not tax Social Security benefits at all. If you live in one of those states, you have no state tax liability on your benefits regardless of your income.

If you live in a state that taxes benefits, that state's tax authority publishes its own worksheet or calculator. Your state tax return will ask you to report your Social Security income separately so the state can explore its own rules. The federal calculation does not automatically determine your state tax, so you may owe state tax even if you owe no federal tax, or vice versa.

Frequently Asked Questions

Can I reduce my taxes by not claiming Social Security yet?

Delaying your claim until a later age increases your monthly benefit amount permanently, which can change your combined income in future years. If you are currently working and your earnings push you over a threshold, delaying your claim until you retire may lower your tax burden. However, delaying also means you receive fewer total payments over your lifetime unless you live well into your 80s. This is a long-term decision that depends on your health, life expectancy, and financial situation, not just taxes.

What if I made a mistake on my tax return and reported the wrong amount?

You can file an amended return using Form 1040-X. The IRS will recalculate your tax based on the corrected amount of taxable benefits. If you owe more, you will receive a bill with interest. If you overpaid, you will receive a refund. File the amended return as soon as you discover the error to minimize interest charges.

Do I have to pay tax if my only income is Social Security?

No, not unless you have nontaxable interest. If your only income is Social Security and you have no nontaxable interest, your combined income equals half your benefits, which is below the first threshold for any filing status. You owe no federal tax. However, you may still want to file a return to claim refundable credits like the Earned Income Tax Credit if you have other may have access to income.

Is there a way to avoid paying tax on Social Security altogether?

The only way to avoid tax is to keep your combined income below your threshold. For most people, this means limiting other income sources. If you are still working, reducing your earnings or delaying work until after you claim benefits can help. If you are retired, managing the timing of retirement account withdrawals and investment sales gives you some control over your combined income each year.

What if my income changes during the year?

You calculate your tax based on your actual income for the full year, not your income at the time you claim benefits. If you expect your income to change—for example, you plan to retire mid-year—estimate your combined income for the full year and adjust your withholding or estimated payments accordingly. The Social Security Administration's online calculator lets you enter different income scenarios to see how they affect your tax.