Roth Conversions Before RMDs: A 60s Tax Guide

There is a strange little window in retirement planning that often gets ignored because nothing dramatic is happening yet. You may be retired, your paycheck has stopped, Social Security may not have started, Medicare may or may not be in the picture, and required minimum distributions are still a few years away. This is the low-income gap year zone. It can be boring-looking. It is not boring.

For retirees roughly ages 62 to 73, Roth conversions can act like moving taxable income from a future year where it may be expensive into a current year where it may be cheaper. Not magically cheaper. Not tax-free. More like rearranging Lego pieces before the tower gets too tall and wobbly. The goal is to shrink future required minimum distributions, reduce lifetime taxes, and keep more control over Medicare premiums, Social Security taxation, and survivor taxes.

Why Ages 62 to 73 Can Be a Roth Conversion Corridor

The basic mechanism is simple: traditional IRA and 401(k) dollars are tax-deferred, not tax-erased. A Roth conversion moves money from a pre-tax account into a Roth IRA. You include the taxable converted amount in income now, then future qualified Roth withdrawals can be tax-free.

The IRS explains that a conversion to a Roth IRA results in taxation of any untaxed amounts in the traditional IRA, and the conversion is generally reported on Form 8606. The IRS also notes that there are no income limits on Roth conversions and annual IRA contribution limits do not cap conversions, so the planning constraint is usually tax cost, not eligibility. See the IRS IRA FAQs on rollovers and Roth conversions.

The age 62-to-73 window matters because many retirees have temporarily lower taxable income after leaving work but before required minimum distributions begin. If you delay Social Security, that gap can get even wider. This is not automatically good or bad. It is just available space on the tax shelf.

According to the IRS RMD FAQs, retirees generally must begin RMDs from traditional IRAs, SEP IRAs, SIMPLE IRAs, and retirement plan accounts when they reach age 73. The IRS describes RMDs as “the minimum amounts you must withdraw from your retirement accounts each year.” Roth IRAs are different: the IRS states in Publication 590-B that original Roth IRA owners do not have to take distributions during their lifetime.

That difference is the engine. Convert some traditional IRA money before RMDs begin, and there is less traditional IRA money left to force out later. The Roth side can keep growing without lifetime RMDs. It is not a loophole. It is just the tax code doing exactly what it says, which is oddly refreshing.

How Roth Conversions Reduce Future RMD Taxes

RMDs are calculated by taking the prior December 31 account balance and dividing it by an IRS life expectancy factor. So if your traditional IRA balance is larger, your RMD is larger. If you convert part of that balance to Roth before age 73, you reduce the account base used for future RMD calculations.

Imagine two buckets. One bucket is traditional IRA money: every scoop that comes out later is generally ordinary income. The other bucket is Roth IRA money: qualified distributions are tax-free, and the original owner has no lifetime RMDs. Roth conversions move water from the first bucket to the second, but the transfer itself creates a tax splash in the year you do it. The question is not “Can I avoid tax?” You usually cannot. The better question is “Which year should absorb the splash?”

If you do nothing before 73, your traditional IRA keeps compounding until RMDs start. That may sound pleasant, like letting dough rise. But eventually the oven turns on. Your RMDs can stack on top of Social Security, pensions, interest, dividends, capital gains, and perhaps a spouse’s income. That can push more income into higher brackets and may increase Medicare surcharges.

A conversion strategy tries to smooth that income. Instead of paying a lot of tax later in a compressed RMD phase, you deliberately fill lower brackets in your 60s. NerdWallet’s Roth conversion guide makes the same practical point: conversions raise the tax bill in the year of conversion, but low-income years after retirement and before RMDs begin can reduce the tax cost, and spreading conversions over multiple years can help avoid being pushed into higher brackets.

Step-by-Step: Map Your Personal Conversion Corridor

Do not start with the conversion amount. Start with your tax map. Picking a Roth conversion number without mapping your income is like adding retinol, acids, and a new sunscreen on the same day, then trying to figure out which one caused the chaos. Technically possible. Needlessly dramatic.

1. Estimate your baseline taxable income. Add pensions, interest, dividends, capital gains, part-time work, taxable withdrawals, and any Social Security you plan to claim. Then subtract your standard or itemized deduction.
2. Find your current tax bracket ceiling. The “room” between your baseline taxable income and the top of your target bracket is your rough conversion space.
3. Layer in Medicare IRMAA thresholds. If you are on Medicare, conversion income can raise modified adjusted gross income. CMS states that 2025 IRMAA uses income from two years prior, and the standard Part B premium is $185 per month for individuals at or below $106,000 MAGI and joint filers at or below $212,000. Above those thresholds, surcharges begin.
4. Check Social Security timing. Delaying Social Security can create more conversion room before monthly benefits begin, but it also means spending from other assets temporarily. That may be worthwhile. It may not. The numbers need to sit in the same spreadsheet, not in separate emotional compartments.
5. Decide how you will pay the tax. Paying conversion tax from taxable savings is usually cleaner because the full converted amount lands in the Roth. Paying from the IRA reduces the amount that gets converted and can blunt the benefit.

The best age to start is often the first full year after retirement when earned income drops, but before Social Security and RMDs fill the room again. For some people that is 62. For others it is 65, 67, or 70. There is no universal “best age,” because the useful unit is not age by itself. It is the gap between current taxable income and future forced taxable income.

Should You Convert to the 12%, 22%, or 24% Bracket?

Bracket-filling is not a moral ranking system. The 12% bracket is not automatically virtuous and the 24% bracket is not automatically reckless. They are prices. You are deciding how much tax to prepay at each price to avoid a potentially higher price later.

Converting to the top of the 12% bracket

This is the conservative version. It often fits retirees with moderate IRA balances, modest pensions, and a desire to avoid Medicare surcharges. The tradeoff is that you may not convert enough before RMDs begin, especially if your pre-tax balance is large and still growing. It is like using a teaspoon to drain a bathtub. Technically progress. Possibly not enough progress.

Converting into the 22% bracket

This is often the practical middle. It may make sense when projected RMDs will push you into the same or higher bracket later, or when one spouse may eventually file as single after the other dies. Survivor taxes are an under-discussed part of this. A married couple can look comfortable in joint brackets, then the surviving spouse inherits nearly the same income with single-filer brackets. Rude, but common.

Converting into the 24% bracket

This can be sensible for households with large traditional IRAs, strong pensions, delayed Social Security, or estate-planning goals. But it has to be modeled carefully because 24% federal tax plus state tax plus IRMAA can make the real marginal cost higher than it looks. A conversion that saves future RMD tax but triggers several years of Medicare surcharges may still be worth it, but please make it earn its keep.

CMS reports that income-related monthly adjustment amounts affect roughly 8% of people with Medicare Part B. For 2025, the first IRMAA tier adds $74 per month to Part B and $13.70 per month to Part D for individuals just over the $106,000 MAGI threshold, with higher surcharges at higher income levels. That is not a reason to avoid all conversions. It is a reason to measure the cliff before stepping over it.

Common Mistakes That Shrink the Benefit

• Forgetting that conversions cannot be undone. The IRS says Roth conversions made on or after January 1, 2018, cannot be recharacterized back to a traditional IRA. So a large December conversion based on vibes is not ideal tax planning.
• Ignoring IRMAA’s two-year lookback. A 2025 Medicare premium can be based on 2023 income. A conversion at 63 can affect premiums at 65. The delay makes it easy to miss, like touching a hot pan and getting the burn in the next room.
• Paying the tax from the IRA without modeling it. If you convert $80,000 but withhold $18,000 for taxes from the IRA, only $62,000 moves to Roth. The withheld amount may also count as a distribution. It is not always fatal, but it is less efficient than using taxable cash when available.
• Misunderstanding the five-year rules. Kitces explains that there are two separate Roth IRA five-year rules: one for qualified earnings treatment and one for conversion principal. For people already over 59½, the conversion five-year penalty rule is generally moot, but the broader Roth five-year clock can still matter for earnings.
• Waiting until RMDs start. Once RMDs begin, you generally must take the RMD first before converting additional IRA dollars. RMDs themselves cannot be converted. This does not end Roth planning, but it makes the corridor narrower.

A simple case-style example shows the scale. Suppose a retired couple, both 63, has $1.4 million in traditional 401(k)/IRA assets, $80,000 in taxable income before conversions, and plans to delay Social Security to 70. If they convert $90,000 per year for seven years, they move $630,000 into Roth before RMDs. Their current taxes rise, yes. But their future traditional IRA balance and RMDs may be dramatically lower. In a reasonable projection with moderate growth, lower widowhood taxes, and fewer high-bracket RMD years, lifetime tax savings can land around $145,000. That number is not universal; change the growth rate, state tax, Social Security age, or death order, and it moves. The mechanism, however, is real.

Social Security, SECURE 2.0, and the Final Decision

Should you delay Social Security to make room for Roth conversions? Sometimes. Delaying benefits can create lower-income conversion years and may increase the eventual monthly benefit. But using portfolio assets while waiting has its own risk, especially in weak markets. The cleanest answer is to compare two coordinated plans: claim earlier with smaller conversions, or claim later with larger conversions.

SECURE 2.0 made this planning window more valuable for many retirees by pushing the RMD starting age to 73 for people reaching age 73 in 2024 or later, according to the IRS. Publication 590-A also notes the RMD age increase to 73 for those turning 72 after December 31, 2022. More years before RMDs means more possible conversion room. Not infinite room. Just more runway before the plane has to take off.

So, should you do Roth conversions in your 60s before RMDs start? If you expect future RMDs to push you into higher tax brackets, if you can pay the tax from taxable assets, if you want more tax-free flexibility later, or if survivor tax exposure is a concern, the answer is often yes. If conversions would trigger painful IRMAA surcharges, force you to sell depressed assets, or use up cash you need for living expenses, the answer may be “smaller” or “not this year.”

The practical next step is not to convert everything. It is to run a year-by-year projection from now through at least age 85. Map baseline income, Social Security timing, RMD estimates, tax brackets, IRMAA thresholds, and survivor scenarios. Then choose annual conversions that fill the right amount of space. Good Roth conversion planning is not a heroic one-time maneuver. It is careful measuring, repeated annually, with fewer surprises later. Which is exactly the kind of boring that can save tens of thousands of dollars.