Many retirees are surprised to learn that Social Security benefits can be taxed at the federal level. Whether any of your benefits are taxable — and how much — depends on a measure called provisional income (also called “combined income”). For 2026, the thresholds that trigger taxation are unchanged from prior years, but a new temporary deduction created by the One Big Beautiful Bill Act (OBBBA) can wipe out the tax for many seniors.
How Social Security Taxation Works
The IRS doesn’t tax your benefits based on your benefit amount alone. Instead, it looks at your provisional income, defined as:
One-half of your Social Security benefits + all other taxable income + tax-exempt interest
If that total stays below a base amount for your filing status, none of your benefits are taxable. Above the base amount, a portion becomes taxable — first up to 50%, then up to 85% of your benefits.
This is one of the few places in the tax code where tax-exempt municipal bond interest still counts against you: it’s added back when computing provisional income, even though it isn’t otherwise taxed.
2026 Provisional-Income Thresholds
The base amounts are set by statute (IRC §86) and are not indexed for inflation — they have been frozen at the same levels since the 1980s and 1990s.
| Filing Status | Up to 50% taxable | Up to 85% taxable |
|---|---|---|
| Single / Head of Household / Qualifying Surviving Spouse | $25,000 – $34,000 | Over $34,000 |
| Married Filing Jointly | $32,000 – $44,000 | Over $44,000 |
| Married Filing Separately (lived with spouse) | $0 | Up to 85% from dollar one |
- Single filers: below $25,000 provisional income, no benefits are taxed. Between $25,000 and $34,000, up to 50% of benefits become taxable. Above $34,000, up to 85% can be taxed.
- Married filing jointly: the same structure applies with $32,000 and $44,000 break points.
Because these thresholds never rise with inflation, more retirees drift into taxable territory every year as COLA increases and other income push provisional income higher.
How Much Is Actually Taxed?
The “up to 50%” and “up to 85%” figures are caps, not flat rates. The actual taxable amount is the smaller of:
- 85% of your total benefits, or
- The amount produced by the IRS worksheet in Publication 915, which gradually phases benefits into your taxable income as provisional income rises above each threshold.
The taxable portion is then taxed at your ordinary income rate — there is no special “Social Security tax rate.” For most middle-income retirees, the effective bite lands well below the headline 85% figure.
Worked Example (Single Filer, 2026)
Suppose a single retiree receives $24,000 in Social Security benefits and has $30,000 of pension and IRA income.
- Half of benefits: $12,000
- Other income: $30,000
- Provisional income: $42,000
That exceeds the $34,000 upper threshold, so up to 85% of benefits may be taxable. Running the Pub 915 worksheet, roughly $15,300 of the $24,000 in benefits would be included in taxable income — taxed at the retiree’s ordinary rate, not all 85% in this case but close to it.
The New OBBBA Senior Deduction (2025–2028)
The One Big Beautiful Bill Act created a temporary additional deduction for seniors that significantly cuts the tax many retirees owe — including tax on Social Security benefits — without changing the §86 formula itself.
Key facts confirmed by the IRS:
- Amount: An extra $6,000 deduction per qualifying individual age 65 or older. A married couple where both spouses are 65+ can claim $12,000.
- Years: Effective for tax years 2025 through 2028.
- Who qualifies: You must turn 65 on or before the last day of the tax year. The deduction is available whether you itemize or take the standard deduction.
- Phase-out: It begins to phase out once modified adjusted gross income (MAGI) exceeds $75,000 (single) or $150,000 (married filing jointly). Per the OBBBA provisions, the deduction is reduced by 6% of the amount over the threshold, which fully eliminates a single senior’s $6,000 deduction around $175,000 MAGI (and a joint couple’s around $250,000).
This deduction is on top of the existing extra standard deduction for those 65 and older. For many lower- and middle-income retirees, the combined effect is to reduce taxable income enough that little or none of their Social Security benefits end up taxed in practice.
Note: The senior deduction does not change the §86 provisional-income thresholds above. It lowers taxable income after the taxable benefit amount is already computed. Run the numbers for your situation rather than assuming benefits are fully sheltered.
State Taxation of Social Security
The thresholds above are federal. Most states do not tax Social Security benefits at all, and the small number that historically did have largely repealed or are phasing out that tax. Check your state’s current rules, but for the large majority of retirees, Social Security is state-tax-free.
Key Takeaways
- For 2026, provisional income below $25,000 (single) or $32,000 (MFJ) means no federal tax on benefits.
- Above those amounts, up to 50% then up to 85% of benefits can be taxed at ordinary rates.
- The §86 thresholds are not inflation-indexed, so more retirees become taxable each year.
- The new $6,000 per-senior OBBBA deduction (2025–2028) can sharply reduce or eliminate the tax for eligible retirees, phasing out above $75,000/$150,000 MAGI.
Use the Social Security taxability calculator to estimate how much of your benefits are taxable, then check your full federal picture with the income tax calculator.