Most people assume Social Security is tax-free. It's not. Up to 85% of your Social Security benefits can be taxed as ordinary income, and 56% of beneficiaries pay federal taxes on their benefits. Worse, the income thresholds that trigger this taxation haven't been adjusted for inflation since 1993 — meaning more retirees get pulled into the tax net every single year. Welcome to the tax torpedo.

85%
maximum portion of Social Security benefits subject to federal tax
56%
of beneficiaries who pay tax on their Social Security
$25,000
single filer threshold where Social Security taxation begins (unchanged since 1993)

How the Tax Torpedo Works

The IRS uses "combined income" (also called provisional income) to determine how much of your Social Security is taxable: Adjusted Gross Income + tax-exempt interest + 50% of your Social Security benefits = Combined Income.

Social Security Taxation Thresholds (2026 — Same Since 1993)

Filing StatusCombined Income% of SS Taxable
SingleUnder $25,0000%
Single$25,000 - $34,000Up to 50%
SingleOver $34,000Up to 85%
Married Filing JointlyUnder $32,0000%
Married Filing Jointly$32,000 - $44,000Up to 50%
Married Filing JointlyOver $44,000Up to 85%

Why It's Called a Torpedo

The torpedo metaphor comes from the effective marginal tax rate in the phase-in zone. When you're in the range where each additional dollar of income makes more of your Social Security taxable, your effective marginal rate can spike to 40.7% — even if your nominal tax bracket is only 22%. Here's why: earning one more dollar of IRA income doesn't just get taxed at 22%. It also makes up to 85 cents of previously untaxed Social Security taxable, which ALSO gets taxed at 22%. The combined effect: you pay 22% on the dollar PLUS 22% on the 85 cents of newly taxable Social Security = up to 40.7% effective rate. That's the torpedo.

Strategies to Minimize or Dodge the Torpedo

Tax Torpedo Avoidance Playbook

1
Roth Conversions Before Claiming SS
Between retirement and age 70, convert traditional IRA money to Roth IRA. You'll pay taxes on the conversion, but Roth withdrawals don't count toward combined income. This shrinks future RMDs and keeps your provisional income below torpedo thresholds.
2
Control the Timing of Income
In years when your combined income is near a threshold, defer income if possible: delay an IRA withdrawal, hold appreciated stocks instead of selling, or time large capital gains for years when other income is low.
3
Use Roth Accounts for Spending Spikes
Need $20,000 for a new car? Pull it from Roth instead of traditional IRA. Roth distributions don't appear on your tax return at all, keeping combined income — and Social Security taxation — low.
4
Manage Capital Gains Carefully
Long-term capital gains count toward combined income. Use tax-loss harvesting, donate appreciated stock to charity (avoids capital gains entirely), or spread large gains across multiple tax years.
5
Consider Tax-Free Municipal Bonds Carefully
Ironic trap: tax-exempt interest from municipal bonds IS included in the combined income formula. Muni bonds reduce your regular tax bill but can INCREASE Social Security taxation. Model both effects before investing heavily in munis.

Effective Marginal Tax Rate by Income Zone (22% Tax Bracket)

Below SS taxation threshold
22
50% taxation phase-in zone
33
85% taxation phase-in zone (torpedo zone)
41
Above torpedo zone
22
Source: Tax Foundation analysis of IRC Sections 86, 2026 rates

The Roth Conversion Window

The years between retirement and age 70-73 (when RMDs start) are golden for tax planning. Your income is typically at its lowest — no paycheck, Social Security may not have started, and RMDs haven't kicked in. This is the window to convert traditional IRA funds to Roth, filling up the lower tax brackets with conversion income. Every dollar converted is a dollar that will never trigger the tax torpedo later.

  • Aim to convert enough each year to fill the 12% or 22% tax bracket without jumping to 24%
  • Your CPA or tax software can model exactly how much to convert each year
  • Roth conversions done now prevent larger RMDs later (which would trigger more SS taxation)
  • Married couples have a wider bracket — use it. The 22% bracket for married filing jointly extends to $201,050 in 2026
  • Don't forget state taxes — 12 states tax Social Security. If you're in one, the torpedo hits even harder. Consider relocating to a no-income-tax state before claiming.

The tax torpedo is a hidden cost of retirement that most financial advisors don't explain clearly until it's already detonating. Understanding it now — and planning around it — can save you $50,000 to $100,000 in taxes over a 25-year retirement.