Provisional income is the figure the IRS uses to decide how much of your Social Security benefit is taxable.
Key takeaways
- Provisional income (the IRS and SSA also call it combined income) equals your adjusted gross income, plus any tax-exempt interest, plus one half (50%) of your annual Social Security benefits, per SSA.
- For single filers, benefits stay untaxed up to $25,000 of provisional income, up to 50% can be taxed from $25,000 to $34,000, and up to 85% can be taxed above $34,000 (IRS Publication 915).
- For married filing jointly, the same tiers apply at $32,000 and $44,000 (IRS Publication 915).
- These thresholds were set by the 1983 and 1993 laws and are fixed, not inflation-indexed, so more retirees cross them each year (SSA Office of the Chief Actuary).
- Qualified Roth IRA withdrawals are not counted in provisional income, so they can fund spending without lifting the figure that taxes your benefit.
- Because one added dollar of ordinary income can pull more of your benefit into tax, the effect is often called the retirement tax torpedo.
Provisional income at a glance
Thresholds set by the Social Security Amendments of 1983 and the Omnibus Budget Reconciliation Act of 1993. They are fixed by law and not indexed for inflation. Sources: SSA and IRS Publication 915.
Provisional Income Calculator
Estimate your provisional (combined) income and how much of your Social Security may be taxable.
Educational estimate. Provisional income = other income + half of Social Security + tax-exempt interest. The $25k/$34k (single) and $32k/$44k (joint) thresholds are set by law and not inflation-indexed. Not individualized tax advice.
What is provisional income in plain terms?
Provisional income is a special measure of income the government uses only to test whether your Social Security benefits are taxable. The SSA and IRS also call it combined income. It is not a line on your tax return, and it is not the same as your taxable income. The SSA frequently asked questions confirm that some beneficiaries must pay income tax on part of their benefits once this figure is high enough.
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The formula has three parts. You start with your adjusted gross income, add any tax-exempt interest (such as interest from municipal bonds), and then add one half of your annual Social Security benefits. The SSA benefits planner states this directly: combined income includes adjusted gross income, nontaxable interest, and half of your Social Security benefits.
How is provisional income calculated?
The calculation is a short addition problem. Work through the three inputs in order and total them.
- Take your adjusted gross income (AGI), but leave your Social Security out of it for this step.
- Add all tax-exempt interest, including interest from municipal bonds that never appears in AGI.
- Add 50% of the Social Security benefits you received for the year.
The total is your provisional income. Consider a single retiree with $22,000 of pension and IRA income, $1,000 of municipal bond interest, and $20,000 of Social Security. Their provisional income is $22,000 plus $1,000 plus $10,000, which equals $33,000. That figure lands inside the middle tier for a single filer. The calculator above runs this same arithmetic for any set of inputs.
What are the provisional income thresholds for 2026?
The thresholds are the same dollar figures that have applied for decades because Congress never indexed them. The table below shows the tiers by filing status and the share of benefits that can be taxed in each band.
| Filing status | Provisional income | Share of benefits that may be taxable |
|---|---|---|
| Single, head of household, or qualifying surviving spouse | Below $25,000 | 0% |
| Single, head of household, or qualifying surviving spouse | $25,000 to $34,000 | Up to 50% |
| Single, head of household, or qualifying surviving spouse | Above $34,000 | Up to 85% |
| Married filing jointly | Below $32,000 | 0% |
| Married filing jointly | $32,000 to $44,000 | Up to 50% |
| Married filing jointly | Above $44,000 | Up to 85% |
Married taxpayers who file separately and lived with a spouse during the year face a $0 base amount, which means their benefits are generally taxable, according to IRS Publication 915. The 85% figure is a cap on how much of the benefit is subject to tax. It does not mean a tax rate of 85%. The exact taxable amount inside each band is set by the worksheet in Publication 915, and the underlying rule sits in Internal Revenue Code Section 86.
Why does provisional income matter so much for retirees?
Provisional income matters because it acts as a switch on a second layer of tax. When it crosses a threshold, ordinary income you already planned to receive can drag part of your Social Security benefit into taxable income too. The mechanics of how each dollar is taxed are covered on our page about the taxation of Social Security benefits, which applies the provisional income figure defined here.
Because the thresholds are not indexed, cost-of-living increases in benefits and normal growth in other income push more households above the lines over time. A retiree who was untaxed on benefits several years ago can find part of the same benefit taxable today without any change in strategy.
What is the tax torpedo and how does provisional income cause it?
The tax torpedo is the sharp rise in marginal tax rate that happens when an extra dollar of income also makes more of your Social Security benefit taxable. Inside the phase-in bands, one added dollar of a withdrawal can add another 50 or 85 cents of benefit to taxable income, so the real marginal rate on that dollar can run well above the stated bracket.
This is why timing income matters. Our explainer on retirement tax torpedoes walks through how a modest withdrawal can carry an outsized tax cost, and how the decision of when to take Social Security interacts with the same thresholds.
Does a Roth withdrawal count toward provisional income?
No. Qualified withdrawals from a Roth IRA do not count toward provisional income. Because they are not included in adjusted gross income and are not tax-exempt interest, they do not raise the figure that decides how much of your benefit is taxed.
That distinction is one reason retirees weigh building Roth balances during lower-income years. Retirees in a low-bracket year sometimes consider a Roth conversion so that later spending can come from Roth dollars that sit outside provisional income. A related question, whether a Roth IRA reduces taxable income, gets to the same idea from the contribution side. A financial professional can model whether shifting the mix of taxable, tax-deferred, and Roth accounts changes how much of a benefit is exposed.
How can retirees plan around provisional income?
Planning around provisional income usually starts with mapping which accounts fund spending in which years. Because taxable, tax-deferred, and Roth accounts each land differently in the formula, the order of withdrawals changes the result. Our guide to a tax-efficient withdrawal strategy covers how that sequencing works across a full retirement.
None of this is a one-size answer, and the right mix depends on your full picture. The educational framing here is meant to explain the mechanics so the numbers are less of a surprise at tax time.
What counts and what does not count in the formula?
Provisional income is broader than many retirees expect because it reaches tax-exempt interest, which is otherwise invisible on the return. The list below separates common items by whether they enter the formula.
| Counts toward provisional income | Does not count toward provisional income |
|---|---|
| Wages, self-employment income, and pension income | Qualified Roth IRA and Roth 401(k) withdrawals |
| Traditional IRA and 401(k) withdrawals | Return of your own after-tax basis |
| Taxable interest, dividends, and capital gains | Supplemental Security Income (SSI) payments |
| Tax-exempt municipal bond interest | The half of your Social Security benefit not added by the formula |
| One half of your Social Security benefits | Loan proceeds and gifts received |
Is provisional income the same as adjusted gross income?
No. Adjusted gross income is one input into provisional income. Provisional income adds tax-exempt interest and one half of your Social Security benefits on top of AGI, so it is usually a larger number.
Is provisional income the same as combined income?
Yes. The SSA uses the term combined income and the IRS worksheet builds the same figure. Both mean adjusted gross income plus tax-exempt interest plus half of your Social Security benefits.
Do the thresholds change each year for inflation?
No. The $25,000 and $34,000 single thresholds and the $32,000 and $44,000 joint thresholds are fixed by law and are not indexed for inflation, according to the SSA Office of the Chief Actuary.
Does 85% mean 85% of my benefit is taxed at my rate?
The 85% is a cap on how much of the benefit is included in taxable income, not a tax rate. Up to 85% of the benefit can be added to income, and that amount is then taxed at your ordinary rate.
Do Roth conversions count toward provisional income in the year of the conversion?
Yes. The converted amount is generally included in adjusted gross income for that year, so it raises provisional income in the conversion year even though later qualified Roth withdrawals do not.
Does tax-exempt municipal bond interest really count?
Yes. Tax-exempt interest is added back specifically for this test, so municipal bond income can raise how much of your Social Security is taxable even though it is not taxed on its own.
Where can I see the official calculation?
Worksheet A and Worksheet 1 in IRS Publication 915 walk through the arithmetic, and the SSA benefits planner summarizes the thresholds by filing status.
Methodology: figures and definitions in this article are drawn from primary government sources, chiefly the Social Security Administration benefits planner and Office of the Chief Actuary and IRS Publication 915, plus the statutory text of Internal Revenue Code Section 86. Because this is a your-money-or-your-life tax topic, no anonymous forum posts or unsourced anecdotes were used. Dollar thresholds were verified against SSA and IRS materials current as of September 2026.
This article is for educational purposes only and is not individualized investment, tax, or legal advice. Consult a qualified professional about your specific situation.
