Free 2026 federal planning calculator
How much of your Social Security may be taxable?
Enter annual benefits and other household income. See combined income, the federal threshold tier, and the estimated benefit amount included in taxable income.
IRS formulaNo account requiredNo Social Security number
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Social Security tax calculator
Estimate how much of your annual benefit may be included in federal taxable income.
Up to 85% tier
$6,850of benefits estimated to be included in federal taxable income19.0% of your benefitsThis is not your tax bill or tax rate. It is the portion of benefits that enters taxable income before deductions, brackets, and credits.
Where you land
Above the $44,000 joint threshold
$0$32k$44k$66k+
Taxable benefits as other income risesThe curve stops at the 85% inclusion cap.
Taxable benefitsYour income
$0 other income$66,000+
Next $10,000 test
A $10,000 Traditional withdrawal could make $8,500 more of your benefits taxable.
That is in addition to the withdrawal itself. A qualified Roth distribution generally does not create the same combined-income effect.
The short answer
“Up to 85% taxable” does not mean an 85% tax rate.
The federal formula first determines how much of your Social Security becomes part of taxable income. The included amount is then combined with the rest of the tax return. Ordinary federal brackets, deductions, credits, capital-gain rules, and other items determine the final tax bill.
Core formula
Combined income = other income + tax-exempt interest + 50% of Social SecurityCompare that result with the statutory thresholds for the filing status.
Federal Social Security tax thresholds
| Filing status | First threshold | Upper threshold | Possible inclusion |
|---|---|---|---|
| Single, head of household, qualifying surviving spouse | $25,000 | $34,000 | 0% to 85% |
| Married filing jointly | $32,000 | $44,000 | 0% to 85% |
| Married filing separately | Special rules; this calculator does not model this status | ||
Below the first threshold, benefits generally are not federally taxable. Between the thresholds, up to 50% may be included. Above the upper threshold, the formula can include up to 85%—but never more than 85% of annual benefits.
What belongs in “other income”?
Use income that generally enters adjusted gross income before Social Security: wages, taxable pensions, traditional IRA or 401(k) withdrawals, interest, dividends, business income, and realized gains. Add tax-exempt interest separately because the Social Security formula counts it even though it may be excluded from federal taxable income elsewhere.
Usually counted
- Wages and self-employment income
- Pensions and annuities
- Traditional IRA and 401(k) withdrawals
- Interest, dividends, and realized gains
- Tax-exempt municipal-bond interest
Needs separate review
- Qualified Roth distributions
- Qualified charitable distributions
- Lump-sum Social Security elections
- Foreign income and special exclusions
- Married filing separately
Why the source of a withdrawal matters
An additional traditional-account withdrawal can create two layers of taxable income: the distribution itself and an increase in taxable Social Security. This is sometimes called the Social Security tax torpedo. The calculator’s $10,000 comparison isolates the second layer; it does not claim that the displayed amount is extra tax.
A qualified Roth distribution generally does not increase AGI and therefore usually does not trigger the same inclusion effect. That does not make Roth universally better. Conversion taxes, five-year rules, Medicare IRMAA, ACA credits, required distributions, estate goals, and state law may change the household result.
What this calculator includes—and excludes
Included
- Single and married-filing-jointly thresholds
- Statutory 0%–85% inclusion formula
- Tax-exempt interest
- Traditional withdrawal test
- Accessible chart and threshold view
Not included
- Final federal or state tax liability
- Deductions, credits, or capital-gain stacking
- Married filing separately
- Publication 915 special worksheets
- Tax treaties or railroad-benefit exceptions
For filing, use Box 5 of Form SSA-1099 and the current IRS worksheet. Read our detailed guide, Are Social Security Benefits Taxable?, for examples, planning cautions, and related retirement-income decisions.
Social Security tax calculator FAQ
How much of Social Security is taxable?
Depending on filing status and combined income, none, up to 50%, or up to 85% of benefits may be included in federal taxable income. The 85% figure is not a tax rate.
What is combined income?
For this federal calculation, combined income generally includes adjusted gross income, tax-exempt interest, and one-half of annual Social Security benefits.
Are the Social Security tax thresholds indexed for inflation?
No. The commonly used $25,000/$34,000 individual thresholds and $32,000/$44,000 joint thresholds are statutory amounts and are not annually indexed.
Do Roth withdrawals make Social Security taxable?
Qualified Roth distributions generally are not included in AGI, so they generally do not enter the combined-income formula. Traditional retirement-account withdrawals generally do.
Does this calculate my actual federal tax bill?
No. It estimates the benefit amount included in taxable income. Your final tax depends on deductions, brackets, credits, gains, filing details, and other rules.
What about married filing separately?
Special rules may apply, including a $0 base amount when spouses lived together during the year. This public calculator does not model married filing separately.
Official sources
Educational estimate only. This tool estimates the federal taxable portion of benefits; it does not prepare a return or provide tax, legal, investment, or Social Security advice.
One threshold can affect several decisions
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