When Should You Do a Roth Conversion?

A Roth conversion is simple in concept: you take money that's sitting in a pre-tax retirement account, a traditional IRA or old 401(k), pay income tax on it now, and move it into a Roth IRA where it grows tax-free going forward.

The question isn't whether conversions can be useful. They often are. The question is when they make sense for your specific situation, because the timing matters a lot.

The Core Logic Behind a Conversion

When you convert, you're making a bet: that paying taxes now at your current rate is better than paying taxes later at your future rate. If you're in a lower bracket today than you expect to be in retirement, converting is often smart. If you're in a higher bracket today, paying taxes now is more expensive, and the case for converting gets weaker.

That's the core logic. Everything else is about finding the right moments to act on it.

When a Roth Conversion Makes Sense

You're in an Unusually Low-Income Year

Career transitions create windows. A job change with a few weeks gap in paychecks. A leave of absence, paid or unpaid. Going back to school. Starting a business that loses money early on. Taking a year off between roles. In any of these situations, your taxable income for the year might be significantly lower than your typical run rate.

That's the window. If you're normally in the 24% bracket but find yourself in the 12% bracket for one year, converting $30,000 or $40,000 at 12% instead of 24% saves real money. On $30,000, that's a $3,600 difference in federal tax alone.

You Have Pre-Tax IRA Money You Want to Reduce

If you have a traditional IRA from old contributions or rollovers, that money will eventually be taxable, either when you withdraw it in retirement or when required minimum distributions (RMDs) force it out starting at age 73. Converting some of that balance in low-income years shrinks the future taxable balance and the future RMDs that come with it.

Smaller RMDs later means more flexibility in retirement. If your RMDs are large, they can push you into higher brackets, trigger more of your Social Security to be taxable, and increase Medicare premiums. Getting ahead of that through conversions can pay off more than the math on the conversion itself suggests.

You Want Tax Diversification in Retirement

Having money in both pre-tax and Roth accounts gives you flexibility in retirement to manage your taxable income year by year. If you can draw from a Roth in years when pulling from a traditional account would push you into a higher bracket or trigger other income-based costs, you're better positioned. A conversion now builds that Roth balance.

When a Roth Conversion Probably Doesn't Make Sense

You're in a High Bracket Right Now

If you're in the 32% or 35% bracket, you're paying a premium to convert. Unless you have strong reason to believe your retirement tax rate will be higher, it's hard to justify locking in a high tax cost now. You're better off leaving the money pre-tax and looking for a lower-bracket year to convert.

You'd Need to Sell Other Investments to Pay the Tax

The conversion amount is added to your ordinary income for the year. If you convert $50,000, you'll owe income tax on $50,000. That tax has to come from somewhere. Ideally, it comes from cash savings, not from selling investments in a taxable account, which may trigger capital gains taxes on top of the conversion tax. If you don't have the cash to cover the tax comfortably, converting a smaller amount or waiting for a better year often makes more sense.

You're Close to a Phase-Out or Threshold That Matters to You

A large conversion can push your income above thresholds for certain tax credits, financial aid eligibility, ACA health insurance subsidies, or Medicare premium tiers. If any of those apply to your situation right now, run the numbers before converting. The conversion might still make sense, but it might also wipe out a benefit worth more than the conversion itself.

How Much Should You Convert?

The general approach is to convert up to the top of your current bracket without pushing yourself into the next one. Say you're a single filer and your taxable income is $40,000, putting you in the 12% bracket. The 12% bracket goes up to $48,475. You have roughly $8,000 of space in that bracket. Converting $8,000 fills that space at 12%. Converting $10,000 would push $1,525 of it into the 22% bracket.

That's the kind of calculation worth doing before you act.

The five-year rule also matters here: Roth conversions have their own five-year clock. Money you convert can't be withdrawn penalty-free for five years from the date of conversion (for those under 59 and a half). If you might need the money soon, account for that. For more on how this interacts with your broader Roth strategy, see Roth IRA vs. 401(k): How to Choose.

If you're earning above the income limit for direct Roth contributions, the backdoor Roth IRA is a separate but related strategy worth understanding.

Frequently Asked Questions

How does a Roth conversion affect my taxes in the year I do it?

The converted amount is added to your ordinary income for the year. If you convert $20,000, it's as if you earned an extra $20,000. That amount is taxed at your marginal rate. This is why doing conversions in low-income years, when your marginal rate is lower, produces better outcomes.

Can I convert just part of my traditional IRA?

Yes. You can convert any amount you choose, not the whole balance. Partial conversions are common and often make more sense because you can target the conversion to stay within a specific bracket.

What is the five-year rule for Roth conversions?

Each Roth conversion starts its own five-year clock. If you're under 59 and a half, you need to wait five years after a conversion before withdrawing those converted dollars penalty-free. This is separate from the five-year rule for Roth contributions. If you're already over 59 and a half, this rule generally doesn't apply to you.

Is a Roth conversion the same as a backdoor Roth?

They share the same conversion step, but they're different strategies with different purposes. A backdoor Roth is for high earners who can't contribute directly to a Roth. It starts with a nondeductible traditional IRA contribution and then converts it. A Roth conversion is about strategically moving existing pre-tax money into a Roth to manage future taxes. You can do both, depending on your situation.

What are required minimum distributions and why do they matter here?

Starting at age 73, the IRS requires you to withdraw a minimum amount from pre-tax retirement accounts each year. Those withdrawals are taxable. The larger your pre-tax balance, the larger your RMDs and the more income you're forced to recognize each year in retirement. Converting some of that balance to Roth now reduces future RMDs, giving you more control over your taxable income later.

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Disclosure: This article is for educational purposes only and does not constitute personalized investment, tax, or legal advice. Individual situations vary. Please consult a qualified financial professional before making financial decisions. Villaire Financial, LLC is a registered investment adviser. Schedule a free intro call if you'd like to talk through your specific situation.