Where the Social Security Tax Torpedo Actually Bites in 2026

The Social Security “tax torpedo” is the name for a quirk in how benefits are taxed: in the range where your benefits are becoming taxable, each extra dollar of income can be taxed at far more than your bracket rate. A common shorthand for the effect is “your bracket rate times 1.85.” That is right as arithmetic, but how high it actually climbs for a real person depends on things that shorthand skips: how large the benefit is, whether you are 65, and for 2025 through 2028 a new deduction that lifts the peak above the usual number. Every figure below is computed with the IRS's own worksheet and the 2026 tax rules, the same engine as the Taxable Social Security Calculator.

The rule, in one paragraph

The IRS compares your “provisional income” (half of your Social Security benefits plus all your other income, including tax-exempt interest) with two thresholds. For a single filer, none of the benefits are taxable at or below $25,000, up to 50% can be taxable between $25,000 and $34,000, and up to 85% above $34,000; for a married couple filing jointly the thresholds are $32,000 and $44,000. No more than 85% of benefits is ever taxable (IRS Publication 915). Those dollar figures are written into the statute itself (26 U.S.C. § 86(c)) rather than adjusted for inflation. And “85% taxable” does not mean an 85% tax rate: it means up to 85% of the benefit is added to your income and then taxed at your ordinary rates.

Why one extra dollar can count as $1.85

Inside the 85% range, every extra dollar of other income makes another 85 cents of your benefits taxable, so $1.85 of income is taxed instead of $1.00. In the 50% range it is $1.50. The real rate on the next dollar is therefore your bracket rate multiplied by 1.5 or 1.85:

• 10% bracket: 15% in the 50% range, 18.5% in the 85% range.
• 12% bracket: 18% in the 50% range, 22.2% in the 85% range.
• 22% bracket: 33% in the 50% range, 40.7% in the 85% range.
• 24% bracket: 36% in the 50% range, 44.4% in the 85% range.

It does not go on forever. The effect ends at the point where 85% of your benefits are already taxable; past that, more income no longer pulls in any more benefits, and the rate drops back to your bracket rate. So the torpedo is bounded by the size of your benefit: a small benefit means a short, low zone.

How high it climbs: it depends on the size of the benefit

The table shows a single filer aged 65 or older in 2026, with all other income treated as ordinary income and the standard deduction, the extra deduction for age 65+, and the senior deduction applied. “Real rate” is the federal tax on the next $1,000 of other income, including the extra benefits it makes taxable.

Two things stand out. First, with benefits up to about $30,000 a year the zone lies entirely in the 10% and 12% brackets, so the peak is 22.2%, well short of the 40.7% the 22% bracket would give. Second, the jump to the 22% bracket arrives at roughly $35,750 of annual benefits (about $2,979 a month) for a single filer aged 65 or older, because the standard deduction, the extra age-65 deduction and the senior deduction keep taxable income low through most of the zone.

• Single, not yet 65 (claimed at 62 to 64): no age deductions, so the 22% bracket is reached at about $29,750 a year ($2,479 a month), and the peak is 40.7% (22% × 1.85).
• Married couple, both 65 or older: the thresholds and deductions are larger, so it takes about $84,250 of combined benefits ($7,021 a month) before the zone reaches the 22% bracket; below that the peak is 22.2%.

The 2025–2028 wrinkle: the senior deduction makes the peak higher, not lower

A new $6,000 deduction for each person aged 65 or older is available for tax years beginning before 2029. It is reduced by 6% of your modified adjusted gross income above $75,000 ($150,000 on a joint return), and that income figure is your AGI, which includes the taxable part of your benefits (26 U.S.C. § 151(d)(5)(C); Schedule 1-A). So once you are above the threshold, the extra benefits the torpedo pulls in also shrink the deduction, and the two effects compound.

On a joint return the deduction is $6,000 for each qualifying spouse and the 6% reduction applies to each spouse's $6,000 (Schedule 1-A computes line 35 once and enters it on both line 36a and line 36b), so for a couple with both spouses 65 or older it is 12% in total. A couple like that first reaches the 22% bracket inside the zone at about $84,250 of combined benefits, and at $96,000 or more the peak is 22% × 1.85 × 1.12 = 45.6%. After 2028 the deduction is gone under current law, and the same situation would peak at the plain 40.7%.

What these numbers leave out

• Qualified dividends and long-term capital gains: they count toward provisional income, but they are taxed at their own rates, so where they are a large part of your income the real rate differs from the ordinary-income figures here.
• State income tax, which varies by state and is not modelled here.
• Married filing separately (if you lived with your spouse at any time in the year, 85% of benefits are taxable from the first dollar), the special worksheets for someone who contributes to a traditional IRA and is covered by a workplace plan, and lump-sum elections for back benefits.
• Everything that is personal: your deductions, credits and other income will differ from the assumptions in the table.

This guide describes how the rules interact. It is not a recommendation to change when or how you take income; your own return or a tax professional can tell you what applies to you.