Question · Retirement
How Is Social Security Taxed? The Provisional Income Test Explained
How Social Security is taxed depends on one figure, provisional income, and on the thresholds Congress set decades ago and never indexed to inflation.
Short answer
Up to 50% or up to 85% of your Social Security benefits can be subject to federal income tax, depending on your provisional income, which is half your benefits added to your other adjusted gross income and any tax-exempt interest. For a single filer the thresholds are $25,000 and $34,000; for married couples filing jointly they are $32,000 and $44,000.
Box 5 of Form SSA-1099 shows the net benefits you received for the year. That number goes on your federal return. The question is how much of it counts as taxable income. The answer runs from none of it to 85%. Your tax bracket has no say in it. A separate test decides, and it mixes your other income with half of your benefits.
What counts as provisional income?
The IRS formula adds up:
- Your adjusted gross income, leaving out the Social Security benefits themselves
- Any tax-exempt interest, such as interest from municipal bonds
- Half of your Social Security benefits for the year
The Social Security Administration calls the same total “combined income”. Tax-exempt interest is the part that surprises people, because a bond whose interest is free of federal tax can still make more of your benefits taxable.
What are the thresholds?
The figures depend on filing status. These are the ones most retirees use.
| Filing status | Up to 50% taxable above | Up to 85% taxable above |
|---|---|---|
| Single | $25,000 | $34,000 |
| Married filing jointly | $32,000 | $44,000 |
Because the thresholds never rise, a retiree whose income grows with inflation will find a larger share of benefits taxable over time, even with no real increase in spending power.
Below the first threshold, none of your benefits are taxable. Between the two, up to half can be. Above the second, up to 85% can be. No one pays tax on more than 85%, however high their income.
How does the calculation work?
“Up to 85%” does not mean 85% of your benefits become taxable the moment you cross $34,000, because the formula phases the tax in gradually and then takes the smaller of two results, so someone just over the line has far less than 85% of benefits exposed.
So $11,300 of the $24,000 is taxable. That is about 47% of the benefits. The $4,500 is half the $9,000 gap between the two single thresholds.
Someone between the thresholds uses a simpler version. Now drop other income to $18,000, with benefits still $24,000. Provisional income is 18,000 + 12,000 = $30,000, which is $5,000 over the $25,000 line, and the taxable amount is the lesser of half that excess ($2,500) or half the benefits ($12,000), so $2,500 of benefits is taxable.
Married couples filing jointly run the same formula with their own thresholds.
The $6,000 is half the $12,000 gap between the joint thresholds.
Tax on benefits is not withheld unless you ask. You can request federal withholding from your benefit payments by filing Form W-4V with the Social Security Administration, which can spare you a large bill or estimated payments in April.
Do states tax Social Security too?
Most states do not tax Social Security benefits at all. A few do. Several of those exempt retirees below an income level they set. Check your state revenue department’s rules. Check again before moving in retirement, since the list has changed over the years.
How can you keep more of your benefits untaxed?
Every dollar you take from a traditional account raises adjusted gross income, and so raises provisional income, and in the phase-in range that one dollar can also make up to 85 cents of benefits taxable, so the marginal tax on the withdrawal is higher than your bracket suggests, an effect sometimes called the tax torpedo. The lesson on the Social Security tax torpedo works through that range in detail.
Qualified Roth withdrawals do not enter adjusted gross income. Money you can draw from a Roth account in retirement leaves provisional income where it is, which is one of the reasons the choice between a Roth and a traditional IRA matters well before you claim.
Timing also plays a part. Some people draw more from traditional accounts in the years before they claim benefits, when no benefits are exposed to the test, and then claim later at a higher amount. The Social Security claiming calculator shows how the claiming age changes the benefit. The full retirement age definition covers the reduction for claiming early.
Situations differ. Run the worksheet on your own figures before changing a withdrawal plan. The retirement topic page collects the related guides and courses.
Questions traders ask next
Is Social Security taxed after age 70?
Yes, if your provisional income is high enough. Age does not change the test. The thresholds are identical whether you claimed early, at full retirement age or after waiting, so the answer turns on your other income and filing status.
Do Roth IRA withdrawals count toward provisional income?
No, as long as they are qualified. A qualified Roth withdrawal never enters AGI, so it adds nothing to provisional income and cannot expose more of your benefits to tax. Money taken from traditional accounts does count and can push more of your benefits into the taxable column.