Social Security Tax Calculator: How Much Is Taxable?
Up to 85% of your Social Security benefits can be taxable, depending on your other income. Benefits start becoming taxable once your combined income, meaning your other income plus tax-exempt interest plus half of your benefits, passes $25,000 if you’re single or $32,000 if you’re married filing jointly. Taxable benefits don’t mean you’ll owe tax: the 2026 standard deduction, the extra deduction at 65 and the $6,000 senior deduction cover the taxable part for many retirees.
Enter your benefits and other income to see how much is taxable and what you’d owe for 2026. Use your gross benefits from box 5 of your SSA-1099, before Medicare premiums are taken out.
Free calculator
Social Security tax calculator (2026)
Uses the IRS Publication 915 worksheet, 2026 tax brackets, standard deductions and the senior deduction.
How the calculator works
It follows the worksheet in IRS Publication 915 and then estimates your tax with the 2026 figures:
- Combined income = other income, including capital gains and Roth conversions, minus adjustments such as deductible IRA and HSA contributions, plus tax-exempt interest, plus half your benefits.
- Up to 50% of benefits become taxable between the first and second thresholds, and up to 85% above the second.
- Taxable benefits are added to your other income to get your adjusted gross income.
- The standard deduction, the extra standard deduction at 65 and the senior deduction are subtracted.
- The 2026 tax brackets are applied to what’s left, with qualified dividends and long-term capital gains taxed at 0%, 15% or 20%.
| Filing status | Benefits start to be taxable above | Up to 85% taxable above |
|---|---|---|
| Single, head of household | $25,000 | $34,000 |
| Married filing jointly | $32,000 | $44,000 |
| Married filing separately, lived apart all year | $25,000 | $34,000 |
| Married filing separately, lived together | $0 | $0 |
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These thresholds aren’t adjusted for inflation, which is why the share of retirees who pay tax on benefits has grown over time.
2026 deductions the calculator uses
| Filing status | Standard deduction | Extra deduction per person 65+ | Senior deduction per person 65+ |
|---|---|---|---|
| Single | $16,100 | $2,050 | $6,000 |
| Head of household | $24,150 | $2,050 | $6,000 |
| Married filing jointly | $32,200 | $1,650 | $6,000 |
| Married filing separately | $16,100 | $1,650 | Not allowed |
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The figures come from the IRS 2026 inflation adjustments. The senior deduction applies for 2025 through 2028 to each taxpayer who is 65 or older, and it shrinks by 6% of modified adjusted gross income above $75,000, or $150,000 on a joint return. Below those amounts you get the full $6,000; it’s gone at $175,000 single or $250,000 joint. Married couples must file jointly to claim it.
The senior deduction comes off taxable income, not adjusted gross income, so it doesn’t change how much of your benefits is taxable. It only lowers the tax on the result, and it does nothing if your income is already covered by the standard deduction.
Examples for 2026
- A married couple, both 65 or older, with $40,000 in Social Security and $30,000 from a pension and IRA withdrawals: $11,100 of their benefits is taxable, but their $47,500 in deductions is more than their $41,100 adjusted gross income. They owe no federal income tax.
- A single 66-year-old with $24,000 in benefits and $30,000 of other income: $11,300 of benefits is taxable and the estimated tax is $1,810. At 63, without the age 65 deductions, the same income owes about $2,776.
- The same single 66-year-old with $10,000 of IRA withdrawals and $20,000 of long-term capital gains instead: the same $11,300 of benefits is taxable, but all $17,150 of taxable income falls within the 0% capital gains rate, up to $49,450 single or $98,900 joint in 2026. The tax is $0.
- A married couple, both 65 or older, with $60,000 in benefits and $120,000 of other income: 85% of benefits, $51,000, is taxable, the senior deduction is cut to $4,740 each, and the estimated tax is about $17,148.
Why extra income can cost more than your bracket
While you’re in the range where more of your benefits are becoming taxable, each extra dollar of other income also pulls up to 85 cents of benefits into taxable income. For the single 66-year-old above, another $1,000 of IRA withdrawals raises taxable income by $1,850 and the tax by $222, a 22% rate on that $1,000 even though the bracket is 12%. The effect stops once 85% of your benefits are taxable.
That’s worth knowing before you take a large IRA withdrawal, a Roth conversion or a capital gain in a year you’re collecting benefits. Deductible IRA or HSA contributions work the other way: they lower combined income, so they can take benefits back out of the taxable range.
What the calculator doesn’t include
- Itemized deductions, credits and the additional Medicare tax.
- State income tax. A handful of states tax Social Security benefits; most don’t.
- Supplemental Security Income, which isn’t taxable at all.
- Figures for 2027, which the IRS publishes each fall; the calculator uses 2026.
Back pay for earlier years
If you get a lump sum that includes benefits for earlier years, such as SSDI back pay, all of it is reported in the year you receive it. IRS Publication 915 has a lump-sum election that lets you figure the taxable part for each earlier year using that year’s income, which often makes less of it taxable. You don’t amend the old returns; the election is made on the current one.
Paying the tax on your benefits
You can have federal tax withheld from each payment at 7%, 10%, 12% or 22% by filing Form W-4V with Social Security or by setting it up in your my Social Security account. Otherwise, you may need to make quarterly estimated payments. Your SSA-1099, mailed each January, shows the total benefits to enter on your return.