Is your Social Security benefit taxable?
It depends on provisional income, not on the benefit alone. Enter both to see how much of the benefit is included in taxable income.
Usually partly, never fully. Below $25,000 of provisional income (single) or $32,000 (joint), none of the benefit is taxable. Between those figures and $34,000 / $44,000, up to 50% is taxable. Above them, up to 85%. The maximum is 85%, never 100%.
Verified 2026-11-07 · IRC §86
Calculate your taxable share
How provisional income is built
| Component | Included? |
|---|---|
| Wages, pensions, IRA withdrawals, interest, dividends, capital gains | Yes — the AGI lines other than Social Security |
| Tax-exempt municipal bond interest | Yes — added back even though it is not taxed |
| Half of your Social Security benefits | Yes — 50% of the annual benefit |
| Roth IRA qualified withdrawals | No — excluded from AGI |
| The other half of your Social Security benefits | No — never part of provisional income |
The formula is: provisional income = AGI excluding Social Security + tax-exempt interest + 50% of benefits. Provisional income is a screening number. The amount actually taxed is then computed from the tier formulas and included in AGI.
The three tiers
| Provisional income | Single | Married filing jointly | Share of benefit taxable |
|---|---|---|---|
| Bottom tier | up to $25,000 | up to $32,000 | 0% |
| Middle tier | $25,000 – $34,000 | $32,000 – $44,000 | up to 50% |
| Top tier | above $34,000 | above $44,000 | up to 85% |
"Up to" is literal. In the middle tier, the taxable amount is 50% of the excess over the first threshold, capped at 50% of the benefit. In the top tier, it is 85% of the excess over the second threshold plus the lesser of $4,500 ($6,000 joint) or 50% of the benefit, capped at 85% of the benefit. That is why the share climbs gradually rather than jumping to 85% at the threshold.
Worked examples
Using the January 2027 average retired-worker benefit of $2,170 a month — $26,040 a year — half of the benefit is $13,020, so a single filer reaches the first threshold at $11,980 of other income.
| Filing status | Other income | Provisional income | Taxable benefit | Share |
|---|---|---|---|---|
| Single | $10,000 | $23,020 | $0 | 0% |
| Single | $15,000 | $28,020 | $1,510 | 6% |
| Single | $25,000 | $38,020 | $7,917 | 30% |
| Single | $40,000 | $53,020 | $20,667 | 79% |
| Single | $70,000 | $83,020 | $22,134 | 85% |
| Married filing jointly | $20,000 | $33,020 | $510 | 2% |
| Married filing jointly | $30,000 | $43,020 | $5,510 | 21% |
| Married filing jointly | $60,000 | $73,020 | $22,134 | 85% |
| Married filing jointly | $90,000 | $103,020 | $22,134 | 85% |
Why the thresholds never move
The 1983 amendments made up to 50% of benefits taxable starting with the 1984 tax year, using $25,000 and $32,000 as the base amounts. The 1993 Omnibus Budget Reconciliation Act added the 85% tier with adjusted base amounts of $34,000 and $44,000, effective for 1994. Neither set of figures has an inflation index.
The practical consequence is a slow broadening of the tax. A benefit that was untaxed when the thresholds were written can become partly taxable after years of COLAs and rising other income, because the benefit grows while the threshold stays where it was in 1984. This is sometimes described as a tax on benefits that were promised as tax-free; the statutory answer is that the exclusion was never indexed.
Questions
What is provisional income?
Adjusted gross income excluding Social Security, plus tax-exempt interest, plus half of your Social Security benefits. That total is compared with the thresholds; it is not the same as AGI and not the same as taxable income.
How much of my benefit can be taxed?
At most 85%. No one pays income tax on 100% of Social Security benefits. The tiers are 0%, up to 50%, and up to 85% of the benefit included in taxable income.
Have the thresholds ever been adjusted for inflation?
No. The $25,000 and $32,000 base amounts have been fixed since 1984, and the $34,000 and $44,000 adjusted base amounts since 1993. Because benefits and other income rise with inflation while the thresholds do not, more of each benefit becomes taxable over time.
Does the standard deduction change whether my benefit is taxable?
It changes whether you owe tax, not how much of the benefit is taxable. Provisional income is computed before any deduction. A retiree can have a taxable benefit included in AGI and still owe no federal income tax after the standard deduction.