The Roth Conversion Strategy That Saves 6 Figures
Last updated 06/5/2026 • By Jason Siperstein, CFA, CFP®, RMA®
💡 Surprising Truth: The most expensive thing in retirement isn’t health care, housing, or travel. It’s unnecessary taxes. While everyone plans for market volatility and inflation, the silent wealth killer—avoidable tax drag—often gets overlooked until it’s too late to fix efficiently.
Most people believe their tax rates will naturally decline in retirement. It seems logical—your income drops, so your tax rate should follow. But the reality is more nuanced and often quite the opposite. There’s a critical window between retirement and age 73 where your tax rates might be the lowest you’ll ever see again.
This chart reveals why that assumption is wrong—and shows the narrow window where you can actually take advantage of lower rates:
Understanding this window can save you tens of thousands, hundreds of thousands, or in cases of larger retirement accounts, even millions in unnecessary taxes over your lifetime.
Four major factors can unexpectedly increase your tax burden as you age. Each of these challenges can be addressed through one powerful strategy: Roth conversions.
Understanding Roth Conversions
Before diving into retirement tax challenges, it’s important to understand what a Roth conversion actually is.
At its core, a Roth conversion is simply transferring money from a Traditional IRA (where contributions were tax-deductible but withdrawals are taxed) to a Roth IRA (where contributions are taxed but withdrawals are tax-free).
When you convert, you pay income tax now on the converted amount. In exchange, those funds—and all their future growth—will never be taxed again. This strategic trade-off creates significant long-term benefits that address several retirement tax challenges.
Roth conversions become particularly valuable when you understand the four major tax challenges retirees face.
1️⃣ THE RMD EFFECT: A FORCED TAX JUMP
At age 73 (or 75 if born in 1960 or later), you lose control over your tax situation. The government requires you to withdraw money from your retirement accounts whether you need it or not. These Required Minimum Distributions (RMDs) force increasing percentages of your retirement accounts into your taxable income each year.
✅ How Roth conversions help: Roth IRAs are not subject to RMDs during your lifetime. By converting Traditional IRA funds to Roth before RMDs begin, those converted funds will never face mandatory distributions. This gives you control over your tax situation throughout retirement instead of being forced into potentially higher tax brackets.
2️⃣ THE WIDOWS TAX TRAP: AN UNEXPECTED TAX INCREASE
When a spouse passes away, the survivor faces a tax challenge few people plan for: the same retirement income suddenly gets taxed at higher rates. This happens because tax brackets for single filers are much narrower than those for married couples, creating an unexpected tax increase during an already difficult time.
Look at these tax brackets below and notice how dramatically they shrink for a single filer compared to married filing jointly:
The same income that was comfortably in the 12% bracket for a married couple can suddenly jump to the 22% bracket for a surviving spouse.
✅ How Roth conversions help: By converting Traditional IRA assets to Roth during lower tax years as a married couple, you protect the surviving spouse from higher tax brackets later. When one spouse passes, the tax-free nature of Roth withdrawals prevents the survivor from being pushed into higher tax brackets—a benefit that becomes even more valuable during this life transition.
3️⃣ THE SOCIAL SECURITY TAX NIGHTMARE
Many retirees don’t realize that traditional IRA withdrawals can trigger taxes on Social Security benefits. This creates a cascading effect where each additional dollar of IRA withdrawal costs more than just its normal tax rate.
This chart illustrates how traditional IRA withdrawals can make more of your Social Security benefits taxable, effectively increasing your tax rate:
✅ How Roth conversions help: Unlike Traditional IRA withdrawals, Roth IRA withdrawals don’t count as income for Social Security tax calculations. This means your Social Security benefits may remain untaxed or taxed at lower rates when you rely on Roth funds in retirement.
If you are interested in learning when is the best time to claim Social Security, you may enjoy our other post:
➡️ Could You Be Losing $100,000+ in Social Security Benefits?
4️⃣ THE MEDICARE PREMIUM CLIFF
Medicare premiums aren’t gradual—they jump at specific income thresholds. Just $1 over a threshold can cost thousands in additional premiums over time. These Income Related Monthly Adjustment Amounts (IRMAAs) create another tax-like expense that proper planning can help avoid.
The chart below shows these premium cliffs—notice how dramatically your costs increase at each threshold:
✅ How Roth conversions help: Since Roth withdrawals don’t count as income for Medicare premium calculations, strategic Roth conversions before Medicare enrollment can help you stay below premium threshold limits, potentially saving thousands in healthcare costs annually.
Finding Your Optimal Conversion Window
These four tax challenges don’t exist in isolation—they compound each other, creating a cascade effect that can dramatically increase your tax burden. RMDs force taxable withdrawals that make more Social Security taxable, which pushes you over Medicare premium thresholds. If one spouse passes away, narrower tax brackets intensify all these problems.
What seems like modest tax rates on paper can become much higher effective rates in practice. But there’s a solution: converting to Roth accounts during the critical window between retirement and age 73. Most people don’t realize this golden window exists, but it can save thousands in future taxes.
This period typically offers:
✅ Lower income after retirement before Social Security and RMDs begin
✅ No RMD requirements yet
✅ Time to strategically fill tax brackets
✅ Flexibility in controlling your tax situation
These four tax challenges don’t exist in isolation—they compound each other, creating a cascade effect that can dramatically increase your tax burden. RMDs force taxable withdrawals that make more Social Security taxable, which pushes you over Medicare premium thresholds. If one spouse passes away, narrower tax brackets intensify all these problems.
What seems like modest tax rates on paper can become much higher effective rates in practice. But there’s a solution: converting to Roth accounts during the critical window between retirement and age 73. Most people don’t realize this golden window exists, but it can save thousands in future taxes.
This period typically offers:
✅ Lower income after retirement before SS and RMDs begin
✅ No RMD requirements yet
✅ Time to strategically fill tax brackets
✅ Flexibility in controlling your tax situation
WHEN TO SKIP CONVERSIONS
While Roth conversions can be valuable, they aren’t right for everyone. Skip them if you need the money within five years (to avoid five-year rule penalties), you’re in peak earning years (avoiding conversions in your highest tax brackets), you’re certain your tax rate will be lower in retirement (though this is increasingly rare), or you plan to leave your IRA to charity since charities don’t pay income tax.
Frequently Asked Questions
A Roth conversion transfers money from a Traditional IRA to a Roth IRA. You pay income tax now on the converted amount, but all future withdrawals from the Roth IRA will be tax-free. There are no annual limits on how much you can convert.
The optimal window is typically between retirement and the age when Required Minimum Distributions begin. This period often offers lower tax rates after work income stops but before Social Security and RMDs
Yes, the converted amount is added to your taxable income for that year. It’s generally better to pay the taxes from other sources rather than using IRA funds, so the full converted amount can grow tax-free.
A: The conversion itself counts as income and may temporarily make more of your Social Security taxable and potentially increase Medicare premiums in the conversion year. However, future Roth withdrawals don’t count as income for either calculation.
Skip conversions if you need the money within five years, you’re in peak earning years with high tax rates, you’re certain your tax rate will be lower in retirement, or you plan to leave your IRA directly to charity.
Ready to slash your retirement tax bill? The critical window between retirement and required minimum distributions (RMDs) won’t last forever. Schedule a complimentary consultation to see if Roth conversions could save you hundreds of thousands in unnecessary taxes over your lifetime.
By Jason Siperstein, CFA, CFP®, RMA®
Jason Siperstein is a fee-only financial planner that specializes in retirement planning. He is based in Rhode Island and serves clients locally and across the country. Jason is called on by local and national news to share his insights.
