Taxes on Social Security Benefits Calculator
Work out how much of your Social Security is taxable, using the combined-income test the IRS actually applies: your other income, plus any tax-exempt interest, plus half your benefits. Crossing a threshold taxes only the amount above it, up to 85%, which makes it a bracket rather than the cliff Medicare's income surcharge uses. Estimate only.
Works offline — your inputs never leave this device. How that works
Your figures
The monthly amount before any Medicare premium is taken out. The calculation works on the gross benefit.
Adjusted gross income without Social Security: pensions, wages, withdrawals from an IRA or 401(k), interest, dividends, capital gains, rental income.
Municipal bond interest and similar. It is not taxed itself, but it counts toward this test — which surprises people who bought municipals to hold their income down.
The thresholds are different for each, and they change the answer more than people expect.
This is a bracket, not a cliff — unlike the Medicare surcharge
Crossing one of these thresholds does not make your whole benefit taxable. Only the amount above the line is affected, up to a cap. At your figures, one more dollar of income adds $0.50 to the taxable portion of your benefits.
Medicare's income-related surcharge works the opposite way: one dollar over one of its lines moves you into a whole new premium bracket for the year. Both are income tests aimed at retirees, both are crossed at thresholds, and confusing them is how people talk themselves out of taking income they could safely have taken.
What is taxable
Your combined income
$42,000
Thresholds for your filing status: $32,000 and $44,000
Taxable portion of your benefits
$5,000
20.8% of the $24,000 you receive
Room to the next threshold
$2,000
Additional combined income before the next band begins
You are in the band where up to half of your benefits can be taxable. The taxable portion is added to your other income and taxed at your ordinary rate — it is not a separate tax, and it is never the whole benefit. This is an estimate of the federal calculation only.
The arithmetic, step by step
This is the IRS worksheet, worked with your figures. Social Security calls the test amount "combined income" and the IRS calls it "provisional income"; they are the same thing.
| Step | Amount |
|---|---|
| Other income (adjusted gross income without Social Security) | $30,000 |
| Plus tax-exempt interest | $0 |
| Plus half your Social Security benefits | $12,000 |
| Combined income | $42,000 |
| 50% of the amount above $32,000 | $5,000 |
| Capped at 50% of your benefits | $12,000 |
| Taxable benefits | $5,000 |
What makes the figure mean something
- This is not a cliff
- Unlike the Medicare IRMAA surcharge, crossing one of these thresholds does not change how your whole benefit is treated. Only the amount above the threshold is affected, up to a cap. The two work in opposite ways, which is a common source of confusion.
- Tax-exempt interest still counts
- Interest from municipal bonds is not taxed, but it does count toward the combined-income test. People who bought municipals specifically to hold their taxable income down are often surprised to find it made no difference here.
- The thresholds have never been adjusted for inflation
- They were written into law in 1983 and expanded in 1993, and the dollar figures have not changed since. Because incomes and benefits have risen and the thresholds have not, a larger share of retirees crosses them every year. This is a feature of how the law was drafted, not an oversight in your planning.
- Your state may tax benefits too
- Most states do not, but a handful still do, each with its own rules and exemptions. Check your own state revenue department — the federal calculation here says nothing about it.
Why the thresholds look so low
The $25,000 and $32,000 figures were set by the 1983 Social Security amendments, and the $34,000 and $44,000 figures by the 1993 budget act. Neither pair was ever indexed to inflation, and neither has moved since. Benefits and incomes have risen for four decades against fixed lines, so a larger share of retirees crosses them every year. That is how the law was drafted, not something anyone missed in their planning.
Verified 2026-08-02 against SSA — Cost-of-Living Adjustment (COLA) Information for 2026 (effective 2026-01-01)
Estimate only — not financial, tax, legal, or insurance advice. Only SSA can determine your actual amounts.
Official source: SSA — Cost-of-Living Adjustment (COLA) Information for 2026 ↗
🎓 Understand this tool
What it is
Works out how much of your Social Security benefit is subject to federal income tax, based on what Social Security calls combined income and the Internal Revenue Service calls provisional income.
How it works
Combined income is your adjusted gross income, plus any tax-exempt interest, plus half your Social Security benefits. That total is tested against two thresholds. Below the first, none of your benefit is taxable. Between them, up to half of the amount above the threshold is. Above the second, up to eighty-five percent is, capped at eighty-five percent of the benefit itself. The calculator follows the worksheet the Internal Revenue Service publishes.
Getting the most from it
- Enter your annual Social Security benefits.
- Enter your other income — everything on your return except Social Security.
- Add any tax-exempt interest, which counts toward this test even though it is not itself taxed.
- Choose your filing status, then read the step-by-step arithmetic below the answer.
Reading your result
The result is the portion of your benefit that enters your taxable income, not a tax bill. What you actually pay depends on your bracket. Note that this works like a bracket and not like a cliff: crossing a threshold affects only the amount above it. That is the opposite of how the Medicare IRMAA surcharge behaves, and the two are regularly confused.
What it can't tell you
These thresholds have never been adjusted for inflation. They were set in 1983 and expanded in 1993, and the dollar figures have not moved since, so a larger share of retirees crosses them every year. This covers federal tax only — a handful of states tax benefits too, each with its own rules. It is not a substitute for a return or for advice from a tax professional.
Frequently asked questions
Anywhere from none of it to 85% of it, depending on your combined income: your other income, plus any tax-exempt interest, plus half your benefits. Below the first threshold none is taxable, and 85% is the most that ever is — the whole benefit is never taxed.
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