The Roth Conversion Window: Why the Years Between Retirement and 73 Matter Most

If you're planning to retire before age 73, you have a window of opportunity that most people don't recognize or take advantage of. This window—the years between retirement and your Required Minimum Distribution age—might be the most valuable tax planning window in your entire retirement.

Consider a common scenario: you retire at 62 or 65. You're not working, so your earned income is zero. Your Social Security hasn't started yet (or you've delayed it). You have a pension, maybe, but perhaps not a large one. Your investment accounts aren't generating much in taxable income because you're living off withdrawals. For the first time in decades, you might be in a low tax bracket.

This is the conversion window. It's the time to move money from your traditional IRA to a Roth IRA. You'll pay taxes on the conversion at your current (low) tax rate. Once it's in the Roth, it grows tax-free forever. You can withdraw from it tax-free in retirement. And crucially, Roth conversions don't count toward your RMDs starting at age 73.

Let's walk through an example relevant to someone in the Tampa Bay area. You retire at 62 with $600,000 in a traditional IRA and other savings to live on. You have no earned income. Your Social Security doesn't start until 67. You're in the 12% tax bracket. Your RMDs don't start until 73.

Over the next 11 years, you could strategically convert portions of your traditional IRA to a Roth. Let's say you convert $40,000 per year. That's $440,000 converted over 11 years. You'll pay roughly $4,800 in taxes per conversion (at the 12% rate), or about $52,800 total. In return, you've moved $440,000 into a tax-free bucket that will never be subject to RMDs and will never create the stacking income that causes Social Security taxation or Medicare premium surcharges.

Compare that to the alternative: doing nothing. At age 73, your RMD on a remaining balance of roughly $160,000 (accounting for growth and the unconverted amount) might be $6,000-7,000 per year. Over your lifetime, you'll pay taxes on that money at whatever your tax bracket is then—likely 22% or higher. You'll have paid more in total taxes, and you'll have had less control over your retirement income. You'll be forced to withdraw money you might not need, creating phantom income that affects Social Security taxation and Medicare costs.

The math strongly favors strategically converting early.

But there's nuance here. IRMAA—Income Related Monthly Adjustment Amounts for Medicare—is based on Modified Adjusted Gross Income from two years prior. Roth conversions increase your MAGI in the year you do them. So if you're on Medicare and contemplating conversions, you need to account for the impact on your premiums two years out.

Let's say you're 65 and on Medicare Part B, paying the standard premium. If you do a large Roth conversion that creates high MAGI, your Part B premium could increase substantially in years 2025 and 2026 (based on 2023-2024 income). Some people accidentally convert so much that the premium surcharge exceeds the value of the conversion itself. Planning requires understanding the IRMAA brackets and converting in strategic amounts.

Here in Florida, there's another advantage. Florida has no state income tax. This means retirees considering conversions don't face a state tax on top of federal. Someone in New York or California might face 10-13% additional state tax on conversions. In Florida, it's all federal, and early retirement often means low federal brackets. The conversion math is more favorable here than in many other states.

Partial conversions are often the answer. Instead of converting $100,000 at once (which might trigger IRMAA surcharges and push you into a higher bracket), you might convert $40,000 one year, $45,000 the next, and $35,000 the year after. This keeps your MAGI controlled, minimizes bracket creep, and still meaningfully reduces your future RMD burden.

The window is real, but it closes. Once you reach 73 and RMDs begin, you can no longer take advantage of the same low-bracket conversion strategy. You're forced to take your RMD income, which might push you into higher brackets anyway. The conversion window is a gift from the tax code, and it's only available before RMDs start.

There's also the practical question of Roth conversion ladders for those who retire substantially before Social Security starts. If you need cash flow and you've converted money, you can withdraw conversions (not earnings) tax-free within five years. This creates flexibility for early retirees who might not have enough other income sources.

For someone in Land O' Lakes, Wesley Chapel, or anywhere in Tampa Bay approaching early retirement with $500,000 or more in savings, a Roth conversion strategy should be developed before your last day of work. The impact over a 30-year retirement can easily be six figures or more in tax savings. It's not guaranteed profit—you're paying taxes now instead of later. But you're paying them at a low rate, on your own schedule, without the forced income that RMDs create.

The best part: you regain control. Instead of the IRS dictating your income through RMDs, you decide how much to convert each year. That control is worth far more than the taxes you'll pay in the process.