How Roth Conversions Before Medicare Can Lower Your Taxes and Premiums

Plenty of people reach their early 60s feeling like they've done everything right — saved consistently, kept expenses reasonable, built up a solid nest egg — only to discover that pulling money out of their traditional IRA or 401(k) in retirement comes with a surprisingly heavy tax bill. And if those withdrawals push income above certain thresholds, Medicare premiums climb too. It's a frustrating one-two punch, but the years between retirement and Medicare enrollment at 65 offer a genuine opportunity to get ahead of it.

Roth conversions during this window — often called the "gap years" — let you move money from a pre-tax account into a Roth IRA, pay taxes now at a manageable rate, and reduce the taxable income that Medicare will later use to set your premiums. Understanding how this works, and how to do it thoughtfully, can make a meaningful difference in how far your savings stretch.

Understand Why the Gap Years Matter

When you stop working but haven't yet started Social Security or required minimum distributions, your taxable income often drops to its lowest point in decades. That temporary dip is the window. Federal tax brackets don't disappear — they just sit there waiting to be filled. If your income is lower than usual, you may be able to convert a portion of your traditional IRA at a 12% or 22% rate rather than the higher rates you'd face once RMDs and Social Security stack up together. Using that low-income window intentionally is the core idea behind gap-year Roth conversions.

Learn How Medicare Premiums Connect to Income

Medicare doesn't charge a flat premium to everyone. Part B and Part D premiums are adjusted based on your income from two years prior — a system called IRMAA, the Income-Related Monthly Adjustment Amount. So what you earn at 63 affects what you pay for Medicare at 65. A larger traditional IRA balance means larger future RMDs, which means higher reported income, which can push you into a higher IRMAA bracket. Converting some of that balance to Roth before 65 shrinks the account that will generate those mandatory distributions later on.

Run the Numbers Before You Convert Anything

Roth conversions aren't automatically beneficial — the amount you convert matters a great deal. Converting too much in a single year could push you into a higher bracket, trigger IRMAA surcharges on the income used two years before Medicare starts, or reduce eligibility for ACA marketplace subsidies if you're covering your own health insurance during the gap years. A good starting point is identifying how much room you have before crossing into the next tax bracket or an IRMAA income threshold, then converting up to — but not over — that line. Tools like the Roth conversion analyzer in TurboTax or a fee-only planner using software like Holistiplan can model this clearly.

Coordinate Conversions With ACA Coverage

If you're retired before 65 and buying health coverage through the ACA marketplace, your income level determines whether you qualify for premium tax credits. Roth conversions count as income, which means converting too aggressively could reduce or eliminate those credits during the years you need coverage most. The balancing act is real: you want to convert enough to reduce future RMDs and Medicare premiums, but not so much that you lose ACA subsidies now. Running both calculations side by side — rather than optimizing for one goal in isolation — gives you a much clearer picture of the right conversion amount for your situation.

Spread Conversions Across Multiple Years

One of the most common mistakes with Roth conversions is treating it as a one-time event rather than a multi-year strategy. Spreading conversions over four or five years keeps annual income at a level that stays within manageable tax brackets and avoids large spikes that could ripple forward into Medicare premium calculations. If you retire at 62 and Medicare starts at 65, you may have three or more years to work with. Even modest annual conversions, repeated consistently, can substantially reduce the balance of a taxable IRA by the time RMDs are required at age 73.

Keep an Eye on State Taxes

Federal brackets get most of the attention in Roth conversion discussions, but state income taxes matter too. Some states — including Illinois and Pennsylvania — exempt most retirement income from state tax, which makes conversions relatively less costly there. Others tax IRA distributions at full ordinary income rates, which can significantly change the math. If you live in a state with meaningful income taxes, factor that into your annual conversion limit. Moving to a lower-tax state like Florida or Tennessee before beginning conversions is something some people plan for deliberately, though that decision involves far more than just taxes.

Don't Overlook the Benefit to Your Heirs

Roth IRAs pass to beneficiaries without income tax, and while the SECURE Act requires most non-spouse beneficiaries to withdraw inherited IRAs within ten years, those withdrawals from a Roth account are still tax-free. This makes Roth conversions a dual-purpose move: they benefit you directly by lowering Medicare premiums and RMD income, and they benefit whoever inherits the account by reducing the tax burden they'll face on withdrawals. If leaving assets efficiently to adult children or other family members is part of your planning, Roth conversions fit naturally into that picture.

Work With a Fee-Only Planner for the Details

Roth conversions sit at the intersection of tax law, Medicare rules, Social Security timing, and estate planning — all of which interact in ways that are genuinely complicated to model on your own. A fee-only financial planner, meaning one who charges directly for their time rather than earning commissions, can map out a multi-year conversion strategy tailored to your specific accounts, income, and goals. Organizations like NAPFA (the National Association of Personal Financial Advisors) maintain directories of fee-only planners if you're not sure where to start. The cost of a few hours of planning can pay for itself many times over.

The gap years between retirement and Medicare are one of the most underused planning opportunities available to people in their early 60s. Taking even small steps now — learning your current tax bracket, estimating future RMDs, modeling one year of conversions — puts you in a much stronger position than waiting until the decisions are already made for you. Start with a single question: what would a modest conversion look like in your situation this year? That's usually enough to get the process moving in the right direction.