Calculator
Social Security taxable income calculator
IRS Publication 915, Worksheet 1, line by line. Enter yearly amounts; on a joint return include your spouse’s income and benefits.
Taxable Social Security$11,30047.1% of your $24,000 in benefits · about $1,356 federal tax at 12%
| Half of your benefits | $12,000 |
|---|---|
| Other income and tax-exempt interest | $30,000 |
| Combined income (Worksheet 1, line 8) | $42,000 |
| Base amount, single | $25,000 |
| Second threshold (50% → 85%) | $34,000 |
| Taxed at the 50% rate | $4,500 |
| Taxed at the 85% rate | $6,800 |
| Cap: 85% of benefits | $20,400 |
| Taxable benefits (Form 1040, line 6b) | $11,300 |
| Tax-free benefits | $12,700 |
Combined income is half of your benefits plus all other income, including tax-exempt interest. The $25,000 / $32,000 base amounts are set in law and are not adjusted for inflation. The tax shown uses one marginal rate; your return applies the brackets.
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When Social Security is taxable: the combined income test
Social Security becomes taxable once your “combined income” passes the base amount for your filing status. Combined income is half of your benefits plus all other income, including tax-exempt interest, minus certain adjustments[p915]. The thresholds are written into the tax code and have not changed since 1993; they are not indexed for inflation[irc86]:
| Filing status | Up to 50% taxable above | Up to 85% taxable above |
|---|---|---|
| Single, head of household, qualifying surviving spouse | $25,000 | $34,000 |
| Married filing jointly | $32,000 | $44,000 |
| Married filing separately, lived apart all year | $25,000 | $34,000 |
| Married filing separately, lived together | $0 | $0 (85% from the first dollar) |
Below the first threshold none of your benefits are taxed. Between the two thresholds, the taxable part is the smaller of half your benefits or half the income over the base. Above the second threshold, 85% of the excess is added, up to a cap of 85% of your benefits[p915].
How much of my Social Security is taxable? Examples
The taxable share rises gradually, not in one jump. A single retiree with $24,000 a year in benefits (combined income starts at $12,000, half the benefits):
| Other income | Combined income | Taxable benefits | Share taxable |
|---|---|---|---|
| $10,000 | $22,000 | $0 | 0% |
| $15,000 | $27,000 | $1,000 | 4.2% |
| $20,000 | $32,000 | $3,500 | 14.6% |
| $25,000 | $37,000 | $7,050 | 29.4% |
| $30,000 | $42,000 | $11,300 | 47.1% |
| $40,000 | $52,000 | $19,800 | 82.5% |
| $50,000 | $62,000 | $20,400 | 85% |
| $60,000 | $72,000 | $20,400 | 85% |
A married couple filing jointly with $40,000 in combined benefits:
| Other income | Combined income | Taxable benefits | Share taxable |
|---|---|---|---|
| $15,000 | $35,000 | $1,500 | 3.8% |
| $20,000 | $40,000 | $4,000 | 10% |
| $30,000 | $50,000 | $11,100 | 27.8% |
| $40,000 | $60,000 | $19,600 | 49% |
| $50,000 | $70,000 | $28,100 | 70.3% |
| $60,000 | $80,000 | $34,000 | 85% |
| $80,000 | $100,000 | $34,000 | 85% |
Tested against the IRS worked examples
The calculator follows Worksheet 1 of Publication 915 and reproduces the IRS examples exactly[p915]:
- Example 1, single: $5,980 benefits, $28,990 pension, wages and interest. Combined income $31,980 is $6,980 over $25,000; half of that ($3,490) is more than half the benefits, so $2,990 is taxable.
- Example 2, joint: $5,600 benefits, $29,750 other income and a $1,000 IRA deduction. Combined income $31,550 is under $32,000: none is taxable.
- Example 3, joint: $10,000 benefits, $40,500 other income. Combined income $45,500 is over $44,000, so 85% of the $1,500 excess ($1,275) is added to $5,000: $6,275 is taxable.
With the calculator's default (single, $24,000 benefits, $30,000 other income) $11,300 of the benefits is taxable, 47.1% of the total.
Taxes on Social Security and the senior deduction
The law signed on July 4, 2025 did not remove the tax on Social Security benefits. It added a separate deduction of $6,000 per person aged 65 or older for 2025 through 2028 ($12,000 for a married couple who both qualify), on top of the existing extra standard deduction for seniors[seniorded]. It phases out above $75,000 of modified AGI ($150,000 joint). The deduction lowers taxable income, so it can reduce the tax you pay on the taxable part of your benefits, but the calculation of how much of your benefits is taxable is unchanged.
What counts toward combined income
- Counts: wages and self-employment income, pensions and annuities, traditional IRA and 401(k) withdrawals (including required minimum distributions), interest, dividends, capital gains and tax-exempt municipal bond interest.
- Does not count: qualified Roth IRA withdrawals, a qualified charitable distribution (see the QCD limit), and the benefits themselves beyond the half already included.
- Joint returns: your spouse's income counts even if your spouse gets no benefits[p915].
Working while you collect has a second, separate effect before full retirement age: the Social Security earnings limit can withhold benefits. And the same income can raise Medicare premiums two years later through IRMAA brackets.
Common mistakes
- Thinking 85% means an 85% tax rate. Up to 85% of benefits is included in income; it is then taxed at your normal bracket.
- Leaving out tax-exempt interest. Municipal bond interest is tax-free itself but counts toward combined income.
- Forgetting the spouse's income on a joint return. It is added even if only one of you receives benefits.
- Expecting the thresholds to rise. $25,000 and $32,000 are fixed, so more retirees pay as benefits rise with each COLA.
- Not withholding. You can ask the SSA to withhold federal tax with Form W-4V; otherwise you may owe estimated tax[taxss].
RelatedEstimate the benefit itself with the Social Security calculator, and see how a large IRA withdrawal changes the picture with the RMD calculator.
Frequently asked questions
Is Social Security taxable?
Partly, for most retirees with other income. If half your benefits plus your other income (including tax-exempt interest) is over $25,000 single or $32,000 joint, up to 50% of benefits is taxable; over $34,000 / $44,000, up to 85%. Below the base amount, none is taxable.
How much of my Social Security is taxable?
Between 0% and 85%. The calculator above applies IRS Publication 915 Worksheet 1 to your numbers; the result is the amount for line 6b of Form 1040.
At what age is Social Security no longer taxable?
There is no such age. Taxation depends only on combined income, not on age. The $6,000 senior deduction for ages 65+ (2025–2028) can lower the tax, but it does not change the taxable amount.
Do I pay tax on Social Security if it is my only income?
Usually not. With no other income, combined income is half your benefits, which is under the base amount unless benefits are above $50,000 single or $64,000 joint.
Does a Roth IRA withdrawal make Social Security taxable?
No. Qualified Roth IRA withdrawals are not income, so they do not count toward combined income. Traditional IRA and 401(k) withdrawals do.
Sources
- Publication 915 (2025), Social Security and Equivalent Railroad Retirement Benefits
- 26 U.S. Code § 86, Social security and tier 1 railroad retirement benefits
- FS-2025-03, Working Families Tax Cuts: Tax deductions for working Americans and seniors (deduction for seniors)
- Request to withhold taxes (taxes on benefits)