What Is Provisional Income for Social Security?
By Hans Goldstein, EA, founder, Retirement Literacy Foundation · Updated
Admitted to practice before the IRS.
Updated September 2026 · Retirement Literacy Foundation, a 501(c)(3) nonprofit
Most people have never heard the term, which is unfortunate, because it quietly decides a large part of their retirement tax bill. You may also see it called "combined income." The two terms mean the same thing.
The formula, in plain terms
Adjusted gross income (wages, IRA and 401(k) withdrawals, pension, dividends, capital gains, rental income, Roth conversions)
+ tax-exempt interest (yes, including municipal bonds)
+ one half of your Social Security benefit
= provisional income
Two things in that list surprise almost everyone.
Municipal bond interest counts. Muni interest is exempt from federal income tax on its own, and people buy it specifically for that. But it is explicitly added back when calculating provisional income. So a tax-exempt bond can still increase the tax you owe on your Social Security.
Roth withdrawals do not count. Qualified withdrawals from a Roth IRA stay out of the formula entirely. That is the single most useful lever most retirees have, and it is why which account you draw from matters as much as how much you draw.
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The thresholds
| Filing status | None taxable | Up to 50% taxable | Up to 85% taxable |
|---|---|---|---|
| Single | Under $25,000 | $25,000 to $34,000 | Over $34,000 |
| Married filing jointly | Under $32,000 | $32,000 to $44,000 | Over $44,000 |
These were written into law in 1983 and have never been indexed to inflation. When they were set, they affected roughly one retiree in ten. Today they reach a large share of ordinary middle-income retirees. Nobody raised a tax; the line simply stopped moving while everything else kept going.
A worked example
A married couple, both retired. $40,000 of Social Security between them. $30,000 from an IRA. $5,000 of municipal bond interest.
| Component | Amount |
|---|---|
| IRA withdrawal (in AGI) | $30,000 |
| Municipal bond interest (added back) | $5,000 |
| Half of Social Security ($40,000 ÷ 2) | $20,000 |
| Provisional income | $55,000 |
$55,000 is above the $44,000 married threshold, so they land in the top tier, where up to 85% of benefits can be taxed. Under the IRS Publication 915 worksheet, $15,350 of their $40,000 benefit becomes taxable (the 85% cap, $34,000, is the most it could ever be).
Now change one thing. Suppose $15,000 of that IRA withdrawal had come from a Roth instead. Provisional income drops to $40,000, which lands in the middle tier rather than the top one, and the taxable part of their benefit falls to $4,000. Same spending money in their pocket, but a noticeably different tax result, decided entirely by which account the money came out of.
What counts toward provisional income, and what does not
Our workshop slide on this says it plainly: virtually every kind of income counts, except money from tax-free accounts. Here is the list, based on the worksheet in IRS Publication 915 (checked October 14, 2026).
| Counts | Does not count |
|---|---|
| Traditional IRA and 401(k) withdrawals, including required minimum distributions | Qualified Roth IRA and Roth 401(k) withdrawals |
| Roth conversions (the converted amount is taxable income that year) | Qualified charitable distributions (QCDs) from an IRA after 70½ |
| Pensions and wages | Qualified health savings account (HSA) withdrawals for medical costs |
| Taxable interest, dividends and capital gains (including gain on a home sale above the exclusion) | The part of a home-sale gain covered by the $250,000 single or $500,000 joint exclusion |
| Net rental and business income | Loan proceeds, such as a home equity line, and gifts or inheritances of cash |
| Tax-exempt interest, such as municipal bond interest | The other half of your Social Security benefit |
Does an IRA withdrawal count as income for Social Security tax?
Yes, every dollar of it. A hypothetical example: a single retiree, 67, with $30,000 of Social Security, takes $30,000 from an IRA. Provisional income is $45,000 ($30,000 plus half of $30,000), above the $34,000 line, and $13,850 of the benefit is taxable. If the same person takes one more $1,000 from the IRA:
| 2026, single, age 67 | $30,000 from IRA | $31,000 from IRA | Change |
|---|---|---|---|
| Taxable part of Social Security | $13,850 | $14,700 | +$850 |
| Taxable income after deductions | $19,700 | $21,550 | +$1,850 |
| Federal income tax | $2,116 | $2,338 | +$222 |
The extra $1,000 created $1,850 of taxable income, because it pulled $850 of Social Security into tax with it. At the 12% rate that is $222 of tax on $1,000, an effective 22% in what is officially the 12% bracket. That is the tax torpedo, described next. Figures use the 2026 single standard deduction, the age 65 add-on and the senior deduction (IRS Rev. Proc. 2025-32 and IRS senior deduction guidance, checked October 14, 2026).
The tax torpedo
There is a stretch of income where each additional dollar you withdraw does two things at once: it is taxed itself, and it drags more of your Social Security into taxable income. The result is an effective marginal rate meaningfully higher than your stated bracket. Someone nominally in the 12% bracket can face an effective rate closer to 22% on those dollars.
This is known as the tax torpedo, and it is the reason two retirees with identical incomes can owe noticeably different amounts. It is not about how much you have. It is about the order and timing of where it comes from.
What to do with this
- Know your number before December. Provisional income is only controllable while the year is still open. Once it closes, it is arithmetic.
- Consider Roth conversions in low-income years, particularly the gap between retiring and starting Social Security, when income is often at its lowest.
- Watch one-time events. A home sale or large withdrawal can push you over a line for a single year, and it also affects your Medicare premium two years later.
- Remember muni interest counts when you are choosing where to hold bonds.
Check your own number
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| Provisional income | $0 |
| Which tier you land in | n/a |
| Share of benefit taxed | 0% |
We will email you a written copy showing how the math worked, what would change your tier, and the thresholds for next year. Free, and you can keep it or forward it to whoever does your taxes.
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Common questions
What is provisional income?
Provisional income is your adjusted gross income, plus any tax-exempt interest such as municipal bond interest, plus half of your Social Security benefit. The IRS uses it to determine how much of your Social Security is taxable. It does not appear as a line on your tax return, so you have to calculate it yourself.
Do Roth withdrawals count toward provisional income?
No. Qualified withdrawals from a Roth IRA are excluded from provisional income entirely. That makes Roth accounts one of the most effective tools for keeping Social Security taxation down. Note that a Roth conversion does count in the year you convert, even though later withdrawals do not.
Does municipal bond interest count toward provisional income?
Yes. Tax-exempt interest is specifically added back when calculating provisional income, even though it is not federally taxable by itself. Municipal bonds can therefore increase the tax you owe on your Social Security benefit.
What is the tax torpedo?
The tax torpedo is the stretch of income where each extra dollar withdrawn is taxed itself and also causes more of your Social Security to become taxable. This produces an effective marginal rate higher than your stated bracket, sometimes close to double it.
Is provisional income the same as MAGI?
No, though they are often confused. Provisional income decides how much of your Social Security is taxable. MAGI (modified adjusted gross income) is used for other purposes, including IRMAA Medicare surcharges. They are calculated differently and used for different things.
Does an IRA withdrawal count as income for Social Security taxes?
Yes. Traditional IRA and 401(k) withdrawals, including required minimum distributions and Roth conversions, are part of adjusted gross income, so they count in full toward provisional income. Qualified Roth withdrawals and qualified charitable distributions do not.
Do RMDs count toward provisional income?
Yes. A required minimum distribution is taxable income and is included in provisional income, which is why RMDs that start at 73 or 75 often make more of a retiree's Social Security taxable.
Does a qualified charitable distribution count toward provisional income?
No. A qualified charitable distribution sent directly from an IRA to a charity after age 70 and a half is excluded from income, so it does not raise provisional income, even though it can satisfy a required minimum distribution.
These numbers change every year
The IRMAA brackets, the standard deduction and the senior deduction are all adjusted annually, and the 2027 figures are published late in 2026. The one exception is the Social Security taxation thresholds, which have not moved since 1983 and are not expected to.
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Run the free calculatorRelated guides
Is Social Security Taxable?The three-step check using your own numbers.What Tax Rate Do You Pay on Social Security?85% taxable is not an 85% tax.How to Reduce Taxes on Your Social SecurityFive levers that lower provisional income.The Retirement Literacy Foundation is a 501(c)(3) non-profit. This guide is general financial education, not individualized investment, tax, or insurance advice. Tax rules change and depend on your personal situation. Consider speaking with a licensed professional before making decisions.
Hans Goldstein, EA
Founder & Executive Director · Retirement Literacy Foundation, a 501(c)(3) non-profit
Admitted to practice before the IRS
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People also ask
What are examples of provisional income?
Wages, pension payments, traditional IRA and 401(k) withdrawals, Roth conversions, interest, dividends, capital gains and rental income all count, plus tax-exempt municipal bond interest and half of your Social Security. Qualified Roth IRA withdrawals do not count.
What income does not count against Social Security?
For the benefit tax, qualified Roth withdrawals, the return of your own after-tax money, and gifts or inheritances do not count toward provisional income. For the separate earnings test before full retirement age, only wages and self-employment income count; pensions, IRA withdrawals and investment income do not.
How do I calculate how much of my Social Security is taxable?
Add your other income, tax-exempt interest and half your benefit. Up to $32,000 married ($25,000 single) none is taxable; between $32,000 and $44,000 ($25,000 to $34,000 single) up to 50% is; above that up to 85%. IRS Publication 915 has the worksheet, and our free calculator runs it.
Related
- How much of Social Security is taxable
- Social Security tax rate
- IRMAA calculator
- The SSA-1099 explained
Sources: IRS Publication 915; SSA income taxes and your benefit. Checked October 3, 2026.
See also: Where the thresholds apply: how much of Social Security is taxable.