Roth Conversions in Retirement: The Planning Window Most Advisors Never Open

There is a planning window in retirement that most financial advisors never open. It sits between the day you retire and the day your Required Minimum Distributions begin — typically a span of 8 to 12 years. During this window, your taxable income is often at its lowest. Your tax brackets are wider than they’ll ever be again. And the Roth conversion opportunity that exists during these years quietly closes when your RMDs start.

Most people never use it — not because they don’t want to, but because their advisor manages their portfolio and their CPA manages their taxes, and nobody is managing the two together.

That’s the customization gap in action. And for retirees with $2 million or more, leaving this window unused can cost $100,000 to $300,000 in lifetime taxes.

What a Roth Conversion Actually Does

A Roth conversion moves money from a traditional IRA — where it will eventually be taxed as ordinary income when you withdraw it — into a Roth IRA, where it grows tax-free forever and is never subject to RMDs.

You pay taxes on the converted amount in the year you convert. That’s the trade: pay the tax now, at a rate you can control, in exchange for tax-free growth and tax-free withdrawals later. For the right person at the right time, it’s one of the most powerful planning tools in retirement.

Why the Window Opens — and Why It Closes

When you retire but before you claim Social Security, your income typically drops significantly. You no longer have a salary hitting your return. You may be drawing from taxable accounts or Roth accounts — neither of which shows up as ordinary income. For many retirees, this creates the lowest effective tax bracket they’ll see for the rest of their lives.

Once Social Security begins, that income fills your lower brackets. Once RMDs begin at age 73, you’re forced to take distributions from your IRA whether you want to or not — and those withdrawals count as ordinary income. The opportunity to convert at favorable rates shrinks or disappears entirely.

The window doesn’t announce itself. It doesn’t send a reminder. If nobody is watching it, it passes.

The Five Variables That Determine the Right Conversion Amount

This is where generic advice fails. “Convert as much as possible” is not a strategy. The right conversion amount in any given year is determined by five variables that are specific to your situation:

1.  Your current tax bracket and how much room you have before the next threshold. Converting $80,000 might keep you in the 22% bracket. Converting $120,000 might push you into 24%. The marginal rate matters.

2.  Your IRMAA exposure. If you’re on Medicare or approaching it, a large Roth conversion can push your Modified Adjusted Gross Income above an IRMAA threshold, triggering $2,000–$10,000+ in additional Medicare premiums two years later. The conversion math has to include the Medicare cost.

3.  Your Social Security timing. If you haven’t claimed Social Security yet, converting before you claim is usually more efficient — your taxable income is lower and your conversion goes further. Once Social Security begins, it fills your lower brackets and reduces the conversion opportunity.

4.  Your withdrawal plan. If you’re drawing primarily from taxable accounts now, your IRA balance is growing tax-deferred and your future RMDs will be larger. Converting now reduces the RMD burden later. This interaction between your current withdrawal strategy and future conversion planning requires a single, coordinated model.

5.  Your estate goals. Roth assets pass to heirs income-tax-free. Traditional IRA assets do not. For families planning to leave assets to children or grandchildren, the estate value of a Roth conversion is often as important as the personal tax savings.

What This Looks Like in Practice

At Sevey Wealth, Roth conversion planning is not a separate conversation from your withdrawal strategy. It’s built into the same model. Before we recommend a conversion amount in any year, we’ve already modeled your Social Security claiming date, your estimated RMDs, your Medicare costs, your bracket exposure, and your estate goals.

We’re also in communication with your CPA before year-end — not after — so the conversion amount reflects your actual income for the year, not a projection made in February.

That coordination — advisor and CPA, investment plan and tax plan, working from the same model at the same time — is what makes the strategy work. Without it, you’re guessing at one of the most consequential decisions in your financial life.

The Conversation Most People Have Never Had

If you have a traditional IRA and you're somewhere between retirement and age 73, here's a useful question to sit with: Has anyone ever walked me through a Roth conversion strategy that accounts for my Social Security timing, my Medicare premiums, and my RMD trajectory — all at the same time?

For most people the answer is no. Not because the opportunity doesn't exist. Not because their advisor is incompetent. But because investment management and tax planning typically happen in separate conversations, with separate professionals, who aren't working from the same model.

That's the gap this blog is describing. And it's not a small one.

The window between retirement and RMDs is finite. It doesn't wait for a good time. If you've never had a coordinated conversation about how to use it, the most useful thing I can offer is a concrete look at what that conversation actually involves — for your specific numbers, your specific timeline, your specific situation.

If you’d like to see what a coordinated conversion strategy looks like for your situation, I’m glad to walk you through it. Book a complimentary Decision Review at seveywealth.com/contact.