Why I Changed My Advice on Roth Conversions for Clients Over 55Save

Why I Changed My Advice on Roth Conversions for Clients Over 55

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About three years ago, I sat across from a 58-year-old client — a former hospital administrator with $1.4 million sitting in a traditional IRA — and told her something I would have said very differently a decade earlier. I told her to slow down on her Roth conversions. Not stop. Slow down. And the reasons why reflect a broader shift in how I approach Roth conversion strategy over 55 for almost every client I work with today.

I’ve been a fee-only CFP for 20 years. No commissions, no product sales, no incentive to push you toward anything except what actually works for your situation. And what I’ve learned — sometimes the hard way, through client outcomes I wish had gone differently — is that Roth conversion advice for people over 55 is far more nuanced than most guides suggest. The math changes. The priorities shift. The risks look different. Here’s what I’ve changed and why.

The Old Advice Wasn’t Wrong — It Was Incomplete

For most of my career, I gave relatively standard Roth conversion guidance: convert in low-income years, fill up lower tax brackets, and let the tax-free growth compound over decades. That framework is still valid. But I was applying it too rigidly for clients in their late 50s and early 60s, and I was underweighting a handful of factors that matter enormously at that life stage.

The biggest thing I was underweighting? The interaction between Roth conversions and Medicare premiums. Specifically, IRMAA — the Income-Related Monthly Adjustment Amount. If your modified adjusted gross income (MAGI) exceeds $103,000 for a single filer or $206,000 for married filing jointly in 2024, your Medicare Part B and Part D premiums jump. Significantly. We’re talking an additional $69.90 to $419.30 per month per person in 2024, depending on how far over the threshold you land.

For a 63-year-old converting aggressively to fill up the 22% bracket, that extra income can trigger IRMAA two years later — Medicare looks at your income from two years prior. I wasn’t modeling that carefully enough. Now I do, every single time.

The Five Factors I Now Weigh Differently After 55

1. The Two-Year IRMAA Lookback

This one deserves its own section because it surprises nearly every client. If you convert $80,000 in 2024, Medicare uses that 2024 income to determine your 2026 premiums. For a couple both on Medicare, an IRMAA surcharge of even $150/month each adds $3,600 per year in costs. Over five years, that’s $18,000 in additional premiums — which meaningfully erodes the tax benefit of the conversion. I now model IRMAA exposure explicitly before recommending any conversion amount for clients within five years of Medicare eligibility.

2. Social Security Taxation Thresholds

Once clients begin Social Security — or plan to within a few years — Roth conversion income can increase the taxable portion of their benefits. Up to 85% of Social Security benefits become taxable once combined income exceeds $44,000 for married couples. A conversion that looks like a 22% bracket decision can actually be taxed at an effective marginal rate closer to 40% once you factor in the Social Security torpedo effect. I’ve started calling this the “hidden bracket” in client meetings, and it reframes the conversation immediately.

3. The Realistic Time Horizon for Tax-Free Growth

The classic Roth argument assumes decades of tax-free compounding. At 35, that’s a compelling story. At 60, the math is tighter. If a client converts $100,000, pays $22,000 in taxes today, and needs that money in 12 years, the breakeven requires a specific return assumption that isn’t always realistic — particularly in conservative portfolios appropriate for someone near or in retirement. I now run breakeven analyses for every conversion scenario, and I’ve stopped assuming the Roth always wins.

4. State Tax Treatment

This one gets overlooked constantly. Thirteen states don’t tax retirement income at all. If a client in a high-tax state like California or New York is planning to retire to Florida or Texas, converting aggressively before the move is a significant mistake. I’ve had clients in their late 50s living in New Jersey who were one to two years away from moving to a no-income-tax state. Waiting saved them 6–10% in state taxes on every dollar converted. The federal savings from converting now rarely outweigh that differential.

5. Required Minimum Distributions Are Not Always the Emergency They’re Made Out to Be

The fear of RMDs drives a lot of conversion decisions I no longer think are always justified. Yes, RMDs from large traditional IRAs can push retirees into higher brackets. But the solution isn’t always aggressive pre-retirement conversion. For clients with charitable intent, a Qualified Charitable Distribution (QCD) strategy — available starting at age 70½ — can satisfy RMDs entirely tax-free up to $105,000 in 2024. For clients with large IRAs and philanthropic goals, that’s a powerful tool that reduces the urgency of expensive conversions.

What I Do Now Instead: A Calibrated Conversion Approach

My current process for clients over 55 looks like this:

  • Map the income timeline: When does Social Security start? When does Medicare begin? Are there pensions, rental income, or required distributions in the picture?
  • Identify the true low-income windows: Often this is between retirement and age 63 or 65 — after earned income stops but before RMDs and Social Security begin. These are the golden years for conversions, and they’re narrow.
  • Set hard IRMAA guardrails: I use income thresholds, not just tax brackets, as the ceiling for conversion amounts in Medicare-adjacent years.
  • Run a Roth conversion vs. QCD comparison for any client with charitable intent and a traditional IRA over $500,000.
  • Model state tax changes explicitly if there’s any possibility of relocation within five years.

The result is usually smaller, more targeted conversions rather than the aggressive multi-year strategies I used to recommend more broadly. And in most cases, the after-tax outcome is better.

An Honest Caveat

I want to be transparent about one limitation of everything I’ve described: this is planning under uncertainty. Tax law changes. Congress adjusted RMD ages twice in recent years — first with the SECURE Act in 2019 (pushing RMDs to 72), then with SECURE 2.0 in 2022 (pushing them to 73, and 75 for those born after 1960). IRMAA thresholds adjust annually. What looks optimal today may look different in five years. I build flexibility into every plan because no Roth conversion strategy survives contact with a tax reform bill entirely intact.

Recommended Resources

These are books I either personally reference or recommend to clients who want to go deeper on the mechanics behind these strategies:

The Bottom Line

My advice on Roth conversions for clients over 55 didn’t change because I was wrong before. It changed because I got more precise. The window for high-impact, low-risk conversions is real — but it’s narrower than it looks, and the landmines around Medicare premiums, Social Security taxation, and state taxes are more consequential than most online Roth content acknowledges.

If you’re over 55 and working through your own conversion strategy, the single most valuable thing you can do is map every income source, every threshold, and every timing decision before you convert a dollar. The tax savings are real. So are the traps.