Taxable Social Security Benefits Calculator (Provisional Income)
Find out how much of your Social Security is taxable in 2026 with the IRS Publication 915 worksheet: provisional income and the 50% and 85% tiers.
Taxable Social Security Benefits Calculator (Provisional Income)
Filing Status
Head of household and qualifying surviving spouse use the same base amounts as single.
Living Arrangement
Did you live with your spouse at any time during the year? This single answer can swing the result by thousands of dollars.
Social Security Benefits
Total annual benefits from box 5 of your SSA-1099 (add RRB-1099 box 5 for tier 1 railroad retirement). Worksheet line 1.
All Other Taxable Income
Wages, pensions, annuities, traditional IRA and 401(k) withdrawals, taxable interest, dividends, capital gains, Schedule C, rents, unemployment. Excludes Social Security and qualified Roth distributions. Worksheet line 3.
Tax-Exempt Interest
Municipal-bond interest from Form 1040 line 2a. It counts in full toward provisional income even though it is never taxable. Worksheet line 4.
Above-the-Line Adjustments
Schedule 1 items such as HSA contributions, deductible IRA contributions, one-half of self-employment tax, self-employed health insurance, and student loan interest. These are subtracted. Worksheet line 7.
Estimate only. Shows the taxable amount of your benefits, not the tax you owe. Does not model state tax. Download Tax47 for a full federal return estimate.
IRS Publication 915, Worksheet 1 (line by line)
| Line | Description | Amount |
|---|---|---|
| 1 | Total benefits (SSA-1099 / RRB-1099 box 5) | $0.00 |
| 2 | Line 1 × 50% | $0.00 |
| 3 | Other taxable income (1040 lines 1z, 2b, 3b, 4b, 5b, 7a, 8) | $0.00 |
| 4 | Tax-exempt interest (1040 line 2a) | $0.00 |
| 5 | Foreign earned income and other exclusions | $0.00 |
| 6 | Add lines 2, 3, 4, and 5 | $0.00 |
| 7 | Above-the-line adjustments | $0.00 |
| 8 | Line 6 minus line 7 (provisional income) | $0.00 |
| 9 | Your base amount | $0.00 |
| 10 | Line 8 minus line 9 (not below zero) | $0.00 |
| 11 | Gap between your two thresholds | $0.00 |
| 12 | Line 10 minus line 11 (not below zero) | $0.00 |
| 13 | Smaller of line 10 or line 11 | $0.00 |
| 14 | Line 13 × 50% (caps at $4,500 or $6,000) | $0.00 |
| 15 | Smaller of line 2 or line 14 | $0.00 |
| 16 | Line 12 × 85% | $0.00 |
| 17 | Add lines 15 and 16 | $0.00 |
| 18 | Line 1 × 85% (absolute ceiling) | $0.00 |
| 19 | Smaller of line 17 or line 18 (taxable benefits) | $0.00 |
Lines 9 through 16 are skipped for married filing separately when you lived with your spouse at any time during the year.
Statutory Thresholds (IRC 86(c))
These amounts are set in statute and have never been indexed for inflation: $25,000 / $32,000 since 1984 and $34,000 / $44,000 since 1994. That is why this page has no tax-year selector.
Notes
- 50% and 85% are ceilings on the share of benefits added to income, not tax rates. The included amount is then taxed at your ordinary bracket.
- Qualified Roth distributions and qualified charitable distributions stay out of provisional income entirely. Municipal-bond interest does not.
- If box 5 of your SSA-1099 is negative because you repaid benefits, none of your benefits are taxable for the year. See Publication 915 for the repayment rules.
- Source: IRS Publication 915, Worksheet 1, and IRC 86.
See what you actually owe
Tax47 takes the taxable benefit amount from here and builds the rest of the return: standard deduction, the age 65 addition, the senior deduction, and your refund or balance due.
How the IRS decides how much of your Social Security is taxable
Nothing on your tax return is labeled "provisional income", yet it is the number that decides whether your benefits get taxed. The IRS builds it inside Publication 915 Worksheet 1, where it lands on line 8. The recipe: all of your other taxable income, plus all of your tax-exempt interest, plus exactly half of your Social Security benefits, minus your above-the-line adjustments. Some sources call it combined income. Same figure.
Read the percentages carefully, because this is where nearly everyone goes wrong. The 50% and 85% figures are caps on the portion of your benefits added to taxable income. They are not tax rates. If 85% of a $30,000 benefit is included, you add $25,500 to taxable income and pay your ordinary rate on that, which for a 12% bracket is roughly $3,060, or about a tenth of the benefit.
Your two thresholds depend only on filing status, with one twist for married filing separately:
| Filing status | Base amount | Second threshold | Gap | First-tier cap |
|---|---|---|---|---|
| Single | $25,000 | $34,000 | $9,000 | $4,500 |
| Head of household | $25,000 | $34,000 | $9,000 | $4,500 |
| Qualifying surviving spouse | $25,000 | $34,000 | $9,000 | $4,500 |
| Married filing separately, lived apart all year | $25,000 | $34,000 | $9,000 | $4,500 |
| Married filing jointly | $32,000 | $44,000 | $12,000 | $6,000 |
| Married filing separately, lived together at any time | $0 | Not applicable | Not applicable | Not applicable |
Below your base amount, none of your benefits is taxable. Between the two thresholds you are in the first tier. Above the second threshold you are in the second tier, where the 85% rules take over.
The Publication 915 worksheet, line by line
Lines 1 through 8 just assemble provisional income. Line 1 is your total benefits, line 2 halves them, lines 3 and 4 add other income and muni interest, line 6 totals everything, line 7 subtracts your adjustments, and line 8 is the result (floored at zero).
Lines 9 through 16 run two lesser-of tests. First tier: take the amount by which provisional income exceeds your base amount, cap it at the gap between your two thresholds, halve it, and then take the smaller of that and half your benefits. Second tier: 85% of whatever sits above your second threshold. Line 17 adds the two together, line 18 sets an absolute ceiling of 85% of your benefits, and line 19 takes the smaller of the two.
The $4,500 and $6,000 figures that circulate in retirement articles are not separate rules. They are simply half of the $9,000 and $12,000 gaps between the two thresholds, so they only bite once provisional income has cleared the second threshold. Below that point, the first-tier amount is half of the excess over your base amount, which is smaller. Plenty of shortcut calculators get this wrong and overstate taxable benefits for filers sitting inside the phase-in band.
A worked example, single filer with $24,000 of benefits and $40,000 of other income: line 2 is $12,000, line 8 is $52,000, line 10 is $27,000, line 12 is $18,000, line 13 is $9,000, line 14 hits the $4,500 cap, line 15 is $4,500, line 16 is $15,300, line 17 is $19,800, line 18 is $20,400, and line 19 is $19,800. That is 82.5% of the benefit included, not 85%.
Why does this page have no year selector? Because these thresholds are fixed in statute at IRC 86(c) and were never indexed for inflation. The $25,000 and $32,000 base amounts date from 1984, and $34,000 and $44,000 from 1994. Every input and every output on this page is identical for 2025 and 2026. More retirees cross the lines each year for one boring reason: incomes went up and the thresholds stayed put.
Why an extra $1,000 from your IRA can cost far more than $1,000 in tax
This is the effect known as the tax torpedo. While you are inside the phase-in range, each extra dollar of other income does two things: it is taxable itself, and it drags more of your benefits into taxable income. The readout above shows the live figure.
Below your base amount, $1 of income adds $1.00 of taxable income. In the first tier it adds $1.50. In the second tier it adds $1.85. Once either the 85% ceiling or the half-your-benefits test binds, there are no benefits left to pull in and you are back to $1.00.
Run two numbers side by side. Single filer, $20,000 of benefits, $30,000 of other income. Taxable benefits come to $9,600. Move other income to $31,000 and taxable benefits rise to $10,450. The extra $1,000 of income raised taxable income by $1,850, so a 12% bracket behaves like 22.2%.
Every fix here comes down to two things: when you take income, and what kind it is. Converting to a Roth before you claim benefits gets the tax over with in years when no benefits are in play. Qualified charitable distributions satisfy an RMD without touching provisional income. Drawing from a Roth rather than a traditional account inside the phase-in band keeps the number flat. Watch the asymmetry, too: muni interest counts in full toward provisional income, while qualified Roth withdrawals do not count at all. The Roth IRA conversion calculator and the RMD calculator cover the two halves of that planning problem.
The 2026 senior deduction and what you will actually owe
Figuring your taxable benefits is only step one. Step two is deductions. The amount from line 19 flows to Form 1040 line 6b and joins the rest of your income, and then your deductions come off: the standard deduction ($16,100 single, $32,200 married filing jointly, $24,150 head of household for 2026), the additional standard deduction for being 65 or older or blind, and the senior deduction created by the One Big Beautiful Bill Act.
That senior deduction is $6,000 per qualifying individual age 65 or older ($12,000 if both spouses on a joint return qualify), effective for tax years 2025 through 2028 under IRC 151(d)(5)(C) as enacted by P.L. 119-21. It phases out at 6 cents per dollar of MAGI above $75,000 (single and head of household) or $150,000 (married filing jointly), and married filers have to file jointly to claim it at all.
Here is the part several other sites get backwards: the senior deduction does not reduce your provisional income. It is taken after AGI, so it cannot change how much of your benefits is taxable. What it can do is erase the tax on those benefits, which looks the same on your refund and is completely different on the worksheet. The senior bonus deduction calculator handles that second step, and the effective tax rate calculator turns the combined result into an overall rate.
One last disambiguation, since the names collide: this page is about income tax on benefits you receive. The 6.2% payroll tax on wages you earn is a different calculation, handled by the Social Security tax calculator.
This calculator provides estimates for educational purposes only and is not tax or legal advice. Verify your situation against IRS Publication 915 or with a qualified tax professional.
Frequently Asked Questions
Common questions about taxable social security benefits calculator (provisional income)
How much of my Social Security is taxable in 2026?
Between 0% and 85%, depending on your provisional income. If provisional income is at or below $25,000 (single) or $32,000 (married filing jointly), none of it is taxable. Above $34,000 / $44,000, up to 85% can be taxable. And that 85% is a ceiling on the share of benefits added to income, not a tax rate. Most middle-income retirees land well below it.
What is provisional income?
Provisional income, also called combined income, is your other taxable income, plus all of your tax-exempt interest, plus exactly half of your Social Security benefits, minus your above-the-line adjustments. You will not find it printed anywhere on your tax return. It lives on one line of one worksheet: line 8 of IRS Publication 915 Worksheet 1.
Are the $25,000 and $32,000 thresholds adjusted for inflation?
No. They are fixed in statute at IRC 86(c) and have never been indexed: $25,000 / $32,000 since 1984, and $34,000 / $44,000 since 1994. That is why more retirees owe tax on their benefits every year without anything about the law changing.
Does the new $6,000 senior deduction make my Social Security tax-free?
Not directly. The OBBB senior deduction ($6,000 per qualifying person age 65 or older for tax years 2025 through 2028, phasing out above $75,000 / $150,000 of MAGI) gets taken after your taxable benefits are already figured. It does not lower your provisional income, and it does not change how much of your benefits is taxable. What it can do is cut your taxable income enough to wipe out the tax you would otherwise owe on those benefits. Married filers have to file jointly to claim it.
Is 85% of my Social Security taxed, or do I pay 85% in tax?
Neither. At most 85% of your benefits gets added to your taxable income, and that amount is then taxed at your ordinary rates. Someone in the 12% bracket with $30,000 of benefits fully in the 85% tier adds $25,500 to taxable income and owes roughly $3,060 of tax on it, which is about 10% of the benefit, not 85%.
Do Roth IRA withdrawals count toward provisional income?
No. Qualified Roth distributions are excluded entirely, which is why drawing from a Roth instead of a traditional IRA can keep benefits untaxed. Municipal-bond interest, by contrast, does count in full even though it is not taxable.
I am married filing separately, so what are my thresholds?
It depends on living arrangements. If you lived apart from your spouse for the entire year, you use the single filer's amounts ($25,000 / $34,000). If you lived together at any point during the year, your base amount is $0 and up to 85% of your benefits is taxable from the very first dollar of provisional income.
What is the Social Security tax torpedo?
It is what happens when each extra dollar of retirement income drags more of your benefits into taxable income along with it. In the 50% tier, $1 of IRA withdrawal adds $1.50 of taxable income; in the 85% tier it adds $1.85, so a 12% bracket can behave like a 22% one. It is the main reason to plan Roth conversions before you claim benefits.