How is Social Security taxed in 2026?
What counts as provisional income
Provisional income = your other income (wages, interest, dividends, IRA withdrawals, pensions, including tax-exempt municipal bond interest) plus half of your Social Security benefit.
The 2026 taxation bands
| Provisional income (married filing jointly) | Provisional income (single) | How much of your benefit is taxable |
|---|---|---|
| Under $32,000 | Under $25,000 | 0% |
| $32,000 – $44,000 | $25,000 – $34,000 | Up to 50% of the amount over the threshold |
| Over $44,000 | Over $34,000 | Up to 85% of your benefit |
The tax torpedo: why your real rate is higher than your bracket
Here's the trap. While you're inside the phase-in range, every extra dollar of IRA income drags up to $0.85 of Social Security into taxable income with it. You pay tax on $1.85 for every $1 you withdrew.
- In the 12% bracket: 12% × 1.85 = a real marginal rate of 22.2%
- In the 22% bracket: 22% × 1.85 = a real marginal rate of 40.7%
Retirees "in a low bracket" routinely pay 40%+ on their next IRA dollar without ever seeing why, the effect hides across two lines of the tax return. Planners call it the Social Security tax torpedo.
What you can actually do about it
- Know where you sit. The torpedo has a start and an end. Once 85% of your benefit is already taxable, extra income is taxed at just your normal bracket again, planning inside vs. beyond the torpedo zone is completely different.
- Consider Roth conversions before claiming. Income moved to Roth before Social Security starts never enters the provisional-income formula, permanently shrinking the torpedo.
- Coordinate withdrawal order. Which account you tap first (taxable, pre-tax, Roth) changes how fast you climb the bands.
- Watch it alongside Medicare thresholds. The same dollar that fires the torpedo can also approach an IRMAA cliff, the two must be planned together.
See this computed from your own tax return. The free check takes five minutes, runs in your browser, and shows your real marginal rate, Medicare headroom, and conversion stops to compare, no account needed.
Run my free check →Common questions
Are Social Security taxation thresholds adjusted for inflation?
No. The $25,000/$34,000 (single) and $32,000/$44,000 (married) provisional-income thresholds are fixed in law and have not changed since the 1980s–90s, which is why a growing share of retirees pay tax on benefits each year.
Does municipal bond interest affect Social Security taxation?
Yes. Tax-exempt interest is added back when computing provisional income, so "tax-free" bonds can still make more of your Social Security taxable.
Can more than 85% of my benefit be taxed?
No. 85% is the maximum share of your Social Security benefit that can be included in taxable income under 2026 federal law.
Does the new senior deduction change how Social Security is taxed?
Not directly, the 2026 $6,000 senior deduction reduces taxable income but does not change the provisional-income formula that decides how much of your benefit is included.