You worked hard, saved diligently, and now you’re drawing income from the assets you built over a lifetime. Then tax season arrives, and the bill feels surprisingly high compared to what you actually spent or withdrew. This unwelcome surprise, known as the “tax torpedo,” affects many retirees.
The tax torpedo is not a penalty or a mistake. It’s the result of how the IRS has long structured the interaction between two common retirement income sources: Social Security and Required Minimum Distributions (RMDs).
What is the tax torpedo?
The tax torpedo occurs when a withdrawal from an IRA or an RMD triggers a domino effect that causes more of your Social Security benefits to become taxable. As income rises, each additional dollar withdrawn from a retirement account may not only be taxed as ordinary income but may also pull additional Social Security income into the taxable column. The result is a hidden spike in your effective tax rate that catches many retirees off guard.
How Social Security taxation actually works.
Most people assume Social Security benefits are either taxable or tax-free. In reality, the IRS uses a formula based on “provisional income” (also called “combined income”) to determine how much of your benefit is taxable. Provisional income includes:
- Adjusted gross income (AGI)
- Tax-free interest income
- Half of your Social Security benefits
Once provisional income crosses certain thresholds, a portion of Social Security benefits becomes taxable.
For individuals with combined income between $25,000 and $34,000 (or between $32,000 and $44,000 for married couples), up to 50% of Social Security benefits may be taxable. For individuals with combined income above $34,000 (or above $44,000 for couples), up to 85% of benefits may be taxable. Importantly, these thresholds are not indexed for inflation, meaning more retirees are impacted each year.
Where RMDs come in.
Starting at age 73, retirees generally must take RMDs from traditional IRAs and 401(k)s. These withdrawals count as ordinary income, which can significantly increase both adjusted gross income and provisional income. That’s where the “torpedo” effect comes into play. As RMD income rises, more Social Security benefits may become taxable at the same time. In some cases, every additional dollar withdrawn from a traditional retirement account can cause up to $0.85 of Social Security benefits to become taxable as well. For retirees in the 12% federal tax bracket, this interaction can create an effective marginal tax rate that behaves more like 22% or higher.
The Medicare connection.
The impact doesn’t necessarily stop with income taxes. Higher income can also increase Medicare Part B and Part D premiums through the Income-Related Monthly Adjustment Amount (IRMAA). In 2026, IRMAA surcharges apply to single filers with modified adjusted gross income above $109,000 and joint filers above $218,000. Because RMDs count toward those income calculations, larger withdrawals can potentially trigger higher Medicare premiums in addition to increased taxation of Social Security benefits.
Strategies that may help.
- Roth conversions: Converting portions of a traditional IRA to a Roth IRA before RMDs begin can help reduce future mandatory withdrawals. Qualified Roth withdrawals generally do not count toward provisional income, meaning they typically won’t increase Social Security taxation or contribute to IRMAA calculations. For many retirees, the years between retirement and age 73 can provide a valuable planning window for partial Roth conversions.
- Qualified Charitable Distributions (QCDs): For retirees age 70 ½ or older, QCDs allow up to $111,000 per person in 2026 to be transferred directly from an IRA to a qualified charity. QCDs can satisfy all or part of an RMD while excluding the distribution from taxable income and the provisional income calculation.
- Thoughtful withdrawal sequencing: The order in which retirement accounts are tapped can meaningfully affect long-term taxes. Coordinating withdrawals among taxable accounts, traditional retirement accounts, and Roth accounts may help manage provisional income and reduce the likelihood of crossing key tax thresholds.
- The senior deduction: For tax years 2025 through 2028, retirees age 65 and older may qualify for a temporary “senior bonus” deduction of up to $6,000 for single filers and $12,000 for joint filers, even without itemizing deductions. However, the benefit phases out at higher income levels.
Taxes in retirement are often more complicated than many people expect, particularly when Social Security, RMDs, and Medicare premiums begin interacting at the same time. The good news is that proactive planning can often help reduce surprises and improve long-term tax efficiency. Reviewing withdrawal strategies, Roth conversion opportunities, and charitable giving approaches before RMDs begin may help retirees maintain greater flexibility throughout retirement. If you would like help evaluating how your Social Security benefits and retirement account withdrawals work together, don’t hesitate to reach out.
Frequently asked questions.
What is the “tax torpedo” in retirement?
The “tax torpedo” refers to the way withdrawals from traditional retirement accounts can unexpectedly increase taxes on Social Security benefits. As income rises, a larger portion of Social Security may become taxable, creating a higher effective tax rate than many retirees anticipate.
How much of Social Security benefits can become taxable?
Depending on your income level, up to 85% of Social Security benefits may become taxable under current IRS rules. The IRS determines this using a formula based on “provisional income,” which includes adjusted gross income, tax-free interest, and half of Social Security benefits.
Why do Required Minimum Distributions (RMDs) matter?
RMDs from traditional IRAs and 401(k)s count as ordinary income and can increase both taxable income and Medicare premiums. For some retirees, RMDs are the primary trigger that pushes them into higher Social Security taxation thresholds.
Can Roth conversions help reduce the impact of the tax torpedo?
Potentially, yes. Converting portions of a traditional IRA to a Roth IRA before RMDs begin may reduce future mandatory withdrawals. Qualified Roth withdrawals generally do not increase provisional income or Social Security taxation.
Can retirement income affect Medicare premiums too?
Yes. Higher income can increase Medicare Part B and Part D premiums through IRMAA (Income-Related Monthly Adjustment Amount) surcharges. Because RMDs count toward those income calculations, larger withdrawals can sometimes create both higher taxes and higher Medicare costs simultaneously.
Disclaimer: The information above is for general educational purposes only and should not be considered financial, tax, or legal advice. Always consult with a qualified professional regarding your specific situation. You should consult with your CPA and/or attorney before implementing any estate planning, gifting, or tax-related strategy.