How Much of Your Social Security Is Taxable? The Formula, Worked Examples and Ways to Lower It

Many people are surprised to learn that Social Security can be taxed. Depending on your other income, none, up to 50% or up to 85% of your benefits can be included in your taxable income. It is never more than 85%.

The rules are the same as they have been for decades. The income thresholds were set in 1983 and 1993 and have never been adjusted for inflation, which is why more retirees owe tax on their benefits every year.

This guide explains the formula in plain terms, walks through examples, and covers what you can do to reduce the tax.

Step 1: Work out your combined income

The IRS uses a figure called combined income (sometimes called provisional income):

Combined income = adjusted gross income + tax-exempt interest + half of your Social Security benefits

Adjusted gross income includes pensions, wages, IRA and 401(k) withdrawals, interest, dividends and capital gains. Tax-exempt interest, such as from municipal bonds, is added back even though it is not taxed itself. Qualified Roth IRA withdrawals do not count.

Step 2: Compare it with the thresholds

Filing status	0% of benefits taxable	Up to 50% taxable	Up to 85% taxable
Single, head of household or qualifying surviving spouse	Combined income under $25,000	$25,000 to $34,000	Over $34,000
Married filing jointly	Under $32,000	$32,000 to $44,000	Over $44,000
Married filing separately and lived with spouse			Usually up to 85% from the first dollar

“Up to” matters. Crossing $34,000 does not make 85% of your benefits taxable at once. The taxable share grows gradually with income, and 85% is the ceiling.

Step 3: Calculate the taxable amount

The exact calculation has a few steps, set out in IRS Publication 915. In short:

Between the two thresholds, the taxable amount is the smaller of half of your benefits or half of the amount your combined income is over the first threshold.

Above the second threshold, it is the smaller of 85% of your benefits or 85% of the amount over the second threshold plus a smaller fixed amount from the first band (up to $4,500 for single filers or $6,000 for married couples).

Tax software does this automatically. The examples below show how it plays out.

Worked examples: single filer

A single retiree receives $24,000 a year in Social Security, about the national average. Here is how much of it becomes taxable at different levels of other income.

Other income (pension, IRA, interest)	Combined income	Taxable Social Security	Share of benefits taxable
$10,000	$22,000	$0	0%
$15,000	$27,000	$1,000	4%
$20,000	$32,000	$3,500	15%
$30,000	$42,000	$11,300	47%
$40,000	$52,000	$19,800	82%
$60,000	$72,000	$20,400	85%

Worked examples: married couple

A married couple filing jointly receives $40,000 a year in combined Social Security.

Other income	Combined income	Taxable Social Security	Share of benefits taxable
$5,000	$25,000	$0	0%
$15,000	$35,000	$1,500	4%
$25,000	$45,000	$6,850	17%
$40,000	$60,000	$19,600	49%
$60,000	$80,000	$34,000	85%
$90,000	$110,000	$34,000	85%

Calculated using the IRS Publication 915 method.

Taxable does not mean you pay 85% in tax

A common misunderstanding: “85% taxable” means up to 85% of your benefits is added to your taxable income. You then pay your normal tax rate on it, after deductions.

For many retirees, the actual tax is modest or zero, because of deductions. In 2026, a single filer 65 or older can deduct:

The $16,100 standard deduction

An extra $2,050 for being 65 or older

Up to $6,000 through the new enhanced senior deduction (2025 through 2028, phasing out above $75,000 of MAGI)

That is up to $24,150 before any tax is owed. For a married couple where both are 65 or older, the total can reach $47,500.

So the single retiree above with $30,000 of other income has $41,300 of adjusted gross income ($30,000 plus $11,300 of taxable benefits). After $24,150 of deductions, $17,150 is taxable. At 2026 rates, the federal tax is about $1,810.

The “tax torpedo”

In the middle band of incomes, each extra dollar of other income can make 50 or 85 cents of Social Security taxable too. That means an extra $1,000 IRA withdrawal might increase taxable income by $1,850. The effective tax rate on that withdrawal can be much higher than your bracket suggests. Planners call this the tax torpedo, and it mostly affects middle-income retirees.

Ways to reduce tax on your Social Security

Draw from Roth accounts. Qualified Roth withdrawals do not count toward combined income.

Consider Roth conversions before claiming Social Security. Paying tax on conversions in your 60s, before benefits start, can lower taxable IRA withdrawals later.

Delay Social Security and live on IRA money first. Using taxable accounts early and claiming larger benefits later can reduce lifetime taxes for some people.

Use qualified charitable distributions. From age 70½, giving directly from an IRA to charity keeps that money out of adjusted gross income.

Watch one-off income. A large capital gain or IRA withdrawal in one year can push more of your benefits into taxable income that year.

Mind tax-exempt interest. Municipal bond interest still counts toward combined income.

Common mistakes to avoid

Forgetting the first year of benefits. If you start Social Security partway through a year while still earning a salary, a larger share of those first months’ benefits is often taxable. Plan for it.

Ignoring Form SSA-1099. Social Security sends it every January. Box 5 shows your net benefits for the year, which is the number the tax calculation starts from. It includes any Medicare premiums deducted from your check.

Counting Medicare premiums as a reduction. The benefit amount used for taxes is before Medicare premiums are taken out. You may be able to deduct the premiums as a medical expense if you itemize.

Missing lump-sum back payments. If you received back benefits for earlier years, the IRS lets you figure the tax as if they were paid in those years, which can lower the bill. Publication 915 explains the method.

Filing separately while living together. Married couples who file separately and lived together at any point in the year generally have up to 85% of benefits taxable from the first dollar.

Having tax withheld from Social Security

If you expect to owe tax, you can have federal income tax withheld from your benefits by filing Form W-4V with Social Security. You can choose to withhold 7%, 10%, 12% or 22%. The alternative is making quarterly estimated tax payments.

What about state taxes?

Only eight states tax Social Security in 2026, and most exempt lower and middle incomes. See our guide to the states that tax Social Security.

If you are in your 50s

How you save now affects how your benefits are taxed later. A mix of traditional and Roth retirement savings gives you more control over your combined income once you retire.

Frequently asked questions

At what income is Social Security not taxable? If your combined income is under $25,000 (single) or $32,000 (married filing jointly), none of your benefits is taxable.

Is Social Security taxed after age 70? Age does not change the rules. Benefits are taxed the same way at any age, based on combined income.

Did the new senior deduction make Social Security tax-free? No. It is a separate deduction for people 65 and older that lowers taxable income, but the formula for taxing benefits did not change.

Can more than 85% of my Social Security be taxed? No. The maximum taxable share is 85%.