Taxable Social Security Benefits Calculator

Find out how much of your Social Security is taxable on your federal return. The calculator follows Worksheet 1 in IRS Publication 915 line by line, shows your provisional income and the tier you fall into, and separately estimates the new $6,000 senior deduction. It applies to the 2025 tax year (filed in 2026) and the 2026 tax year, because the rules and thresholds are the same.

Maintained by Archie Chang · Rules checked against IRS Publication 915 and the statute October 23, 2026 · Methodology & sources

Not financial advice. This calculator provides estimates for informational and educational purposes only. Results are not a loan offer or a guarantee of terms. Always confirm figures with a qualified lender or financial advisor before making decisions.

Your Social Security and income

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Pensions, IRA and 401(k) withdrawals, wages, interest, dividends and gains, minus the Schedule 1 adjustments on lines 11–20, 23 and 25 (for example an HSA or IRA deduction). Do not subtract student loan interest, and do not include Social Security.

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Optional

The IRS counts you as 65 on the day before your 65th birthday, so if you were born on January 1, enter 65 for the year before that birthday.

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Your taxable Social Security benefits

Taxable benefits (Form 1040 line 6b)

$11,300

47.1% of your benefits

Tier 3: up to 85% of your benefits are taxable

Provisional income
$42,000
Base / adjusted base amount
$25,000 / $34,000

Separate: enhanced deduction for seniors

Enter your age (and your spouse's on a joint return) to see this deduction.

This is a deduction for tax years 2025 to 2028. It does not change how much of your benefits are taxable. It also needs a valid Social Security number for each qualified person and, if married, a joint return.

Worksheet lines (Publication 915, Worksheet 1)

  1. 1. Total Social Security benefits (SSA-1099 box 5)$24,000
  2. 2. 50% of benefits$12,000
  3. 3. Other income (Form 1040 lines 1z, 2b, 3b, 4b, 5b, 7a, 8)$30,000
  4. 4. Tax-exempt interest$0
  5. 5. Foreign earned income and similar exclusions$0
  6. 6. Add lines 2 to 5$42,000
  7. 7. Adjustments to income (Schedule 1)$0
  8. 8. Provisional income: line 6 minus line 7$42,000
  9. 9. Base amount$25,000
  10. 10. Line 8 minus the base amount$17,000
  11. 11. Gap between the base and adjusted base amounts$9,000
  12. 12. Line 10 minus line 11, not below zero$8,000
  13. 13. Smaller of line 10 or line 11$9,000
  14. 14. 50% of line 13$4,500
  15. 15. Smaller of line 2 or line 14$4,500
  16. 16. 85% of line 12$6,800
  17. 17. Line 15 plus line 16 (for MFS lived together: 85% of line 8)$11,300
  18. 18. 85% of benefits (the cap)$20,400
  19. 19. Taxable benefits: smaller of line 17 or line 18$11,300

Lines marked skipped are not reached on the worksheet for your inputs. Lump-sum elections and repaid benefits need Worksheets 2 to 4 and are not calculated here.

How Social Security benefits are taxed

The IRS does not tax Social Security by income bracket alone. It first computes provisional income, also called combined income: your adjusted gross income without Social Security, plus tax-exempt interest and a few other exclusions, plus half of your benefits (the total in box 5 of Form SSA-1099). That number is compared with two thresholds that depend on your filing status.

  • At or below the base amount, none of your benefits are taxable.
  • Between the base and the adjusted base amount, you include the smaller of half your benefits or 50% of the excess over the base amount.
  • Above the adjusted base amount, you include 85% of the excess over it, plus the smaller of half your benefits or the 50% amount from the middle tier. The total is capped at 85% of your benefits.
Filing statusBase amountAdjusted base
Single, head of household, qualifying surviving spouse$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 at any time$0$0

The last row matters: a married person who files separately and lived with their spouse at any point in the year has no base amount, so 85% of the amount on line 8 is taxable, up to 85% of benefits. Source: 26 U.S.C. 86(c) and Publication 915.

Worked example

A single filer receives $24,000 in Social Security and has $30,000 of other income, with no tax-exempt interest. Half of the benefits is $12,000, so provisional income is $42,000. That is above the $34,000 adjusted base amount.

  • Line 10: $42,000 minus $25,000 = $17,000.
  • Line 12: $17,000 minus $9,000 = $8,000, and line 13 is $9,000.
  • Line 15: the smaller of $12,000 or 50% of $9,000 ($4,500) = $4,500.
  • Line 16: 85% of $8,000 = $6,800.
  • Line 17: $4,500 + $6,800 = $11,300. The cap on line 18 is 85% of $24,000 = $20,400.

Taxable benefits are $11,300, about 47% of the benefits. Publication 915 works the same way in its own examples: a single filer with $5,980 of benefits and $28,990 of other income reports $2,990 taxable, and a joint couple with $10,000 of benefits and $40,500 of other income reports $6,275. The calculator reproduces those figures exactly.

Why the thresholds are not adjusted for inflation

The $25,000 and $32,000 base amounts and the $34,000 and $44,000 adjusted base amounts are fixed numbers in section 86 of the tax code. Congress set the first tier in 1983 and added the second in 1993, and neither has an inflation adjustment. Because incomes and benefits have risen since, a growing share of beneficiaries owe tax on part of their benefits. Nothing in the 2025 law changed these amounts.

The senior deduction is not "no tax on Social Security"

Public Law 119-21, signed July 4, 2025, created an enhanced deduction for seniors under section 151(d)(5)(C). It is $6,000 for each person who is 65 or older by the end of the tax year, available for tax years 2025 through 2028, whether or not you itemize. It shrinks by 6 cents for each dollar of modified AGI above $75,000 ($150,000 on a joint return), so it is gone at $175,000 for one person and $250,000 for a couple with two qualified spouses. Each qualified person needs a valid Social Security number, and married people must file jointly.

It reduces taxable income. It does not exclude benefits from income, so the worksheet above is unchanged. A retiree with modest income may owe no tax because of the deduction, which is where the "no tax on Social Security" headlines come from, but the benefits themselves can still be taxable. The calculator shows the deduction as a separate result so the two are never mixed.

Withholding, lump sums and state tax

Social Security does not withhold federal tax unless you ask. On Form W-4V you can choose 7%, 10%, 12% or 22% of each payment. If you skip withholding, you may need quarterly estimated payments.

A lump-sum (retroactive) payment for earlier years, or benefits you repaid, change the math. Publication 915 Worksheets 2 to 4 cover those cases and this calculator does not. Publication 915 also says not to use Worksheet 1 if you take a traditional IRA deduction while you or your spouse is covered by a workplace retirement plan (use Publication 590-A, Appendix B), or if you exclude savings bond interest on Form 8815. For state tax, most states do not tax Social Security, but a few do, so check your state revenue department.

Related: see how income also drives Medicare premiums with our IRMAA calculator and plan withdrawals with the RMD calculator.

Social Security tax questions

Is Social Security taxable?

Sometimes. Federal law taxes up to 85% of your benefits when your provisional income, which is your other income plus half of your benefits, is above $25,000 for a single filer or $32,000 for a joint return. Below those amounts none of your benefits are taxed, except for married people filing separately who lived with their spouse at any time during the year: their base amount is $0. The rest of your income is taxed as usual.

How much of my Social Security is taxable?

Between 0% and 85% of your benefits. The IRS Worksheet 1 in Publication 915 gives up to 50% of the amount above the base amount, then 85% of the amount above the adjusted base amount of $34,000 (single) or $44,000 (joint), never more than 85% of your benefits in total.

What counts as provisional income?

Your adjusted gross income without Social Security, plus tax-exempt interest and a few other exclusions, plus 50% of your Social Security benefits. Municipal bond interest is not taxed itself, but it raises provisional income and can make more of your benefits taxable.

Did the 2025 tax law make Social Security tax-free?

No. Public Law 119-21 did not change how benefits are taxed. It added a separate $6,000 deduction for each person age 65 or older for tax years 2025 through 2028, which phases out above $75,000 of modified AGI ($150,000 on a joint return). Your benefits can still be taxable.

Why do the $25,000 and $32,000 thresholds never go up with inflation?

They are written as fixed dollar amounts in section 86 of the Internal Revenue Code, with no cost-of-living adjustment. As wages and benefits rise, more retirees cross them each year.

Can I have taxes withheld from my Social Security?

Yes. File Form W-4V with the Social Security Administration and choose 7%, 10%, 12% or 22% of each payment. No other percentage is allowed. You can also make estimated tax payments instead.

What if I received a lump-sum payment for earlier years or repaid benefits?

This calculator does not handle those cases. Publication 915 has Worksheets 2 to 4 for the lump-sum election and a separate section for repayments. The lump-sum election can lower your tax when the back payment was taxed at today’s income level.

Do states tax Social Security?

Most states do not tax Social Security benefits, but a few do, often with exemptions for lower incomes. Check your state revenue department for the current rules.

Sources (checked October 23, 2026): IRS Publication 915 (2025) · 26 U.S.C. 86 · Pub. L. 119-21, sec. 70103 · IRS Schedule 1-A (Form 1040), Part V · IRS fact sheet FS-2025-03 · IRS Form W-4V · SSA: Taxes and your Social Security benefits