Social Security Tax Torpedo Calculator
The Social Security tax torpedo hits middle-class retirees: above $25K combined income (single) or $32K (married), up to 85% of Social Security benefits become taxable. Each $1 of IRA withdrawal can make $0.85 of SS taxable — creating effective marginal rates of 40-46%.
How The Tax Torpedo Works
If your combined income (other income + 50% SS) exceeds $25K single / $32K married, up to 50% of SS becomes taxable. Above $34K / $44K, up to 85% becomes taxable. Critically, each $1 of additional IRA withdrawal pulls up to $0.85 of SS into taxable income — creating effective marginal rates of 35-46% even in the 22% federal bracket.
Why It Hits Middle-Class Retirees Hardest
Wealthy retirees often have 85% of SS already taxable — no torpedo zone. Lower-income retirees stay under thresholds — no torpedo. The torpedo specifically hits middle-class retirees with combined incomes of $30K-$80K. The thresholds have NOT been indexed for inflation since 1984, so each year more retirees fall into the torpedo zone.
Defusing Strategies
(1) Roth conversions in early retirement years (pre-Social Security) reduce future RMDs. (2) Roth IRA withdrawals don't count toward provisional income. (3) Municipal bond interest is also excluded. (4) Delaying SS to age 70 reduces years in the torpedo zone. (5) HSA withdrawals for medical expenses don't count toward provisional income.
Source: IRS Publication 915 Taxation of Social Security, IRC Section 86, SSA actuarial estimates. Last updated: May 2026.