When Is a Roth Conversion NOT Worth It? Seven Times to Skip It

Almost everything written about Roth conversions is a sales pitch — convert, convert, convert. The truth is more boring: a conversion is just prepaying a tax bill, and prepaying only makes sense if the price is going up. Plenty of the time it isn’t, which is exactly when a Roth conversion is not worth it. Here are the seven situations where the smart move is to leave the money in the traditional IRA and keep your cash.

The one question that decides it

Before any of the specifics: a conversion wins only if your tax rate in the future will be higher than your rate today. That’s the whole game. You pay tax now to skip tax later, so it only pays off if “later” would have cost more. If your rate today is the same or higher than what you’ll face down the road, converting hands the IRS money you didn’t have to give them. Every reason below is really just a version of that same math.

1. You’ll be in a lower tax bracket later

This is the core case. If you’re in a high bracket now and expect a lower one in retirement, converting is a losing trade on its face. Paying 32% or 37% today to avoid 22% or 24% later means voluntarily overpaying by the difference. The classic mistake is a peak-earnings professional converting during their highest-income years, when waiting until they retire into a lower bracket would have been cheaper. If your career income is at its top right now, that is usually the worst time to convert, not the best.

2. You have a big pension — or you simply won’t need the money

A conversion is supposed to defuse a future tax problem. If you don’t have one, there’s nothing to defuse. Two versions of this: a large pension plus Social Security may already keep you in a comfortable bracket for life, so there’s no looming spike for a conversion to smooth out — and if that pension income means your retirement rate is about the same as today’s, you gain little. And if you genuinely won’t spend down the traditional IRA yourself, you’re really converting for your heirs, which only makes sense depending on their tax rates (see #4).

3. You give to charity

If you’re charitably inclined, converting money you’d otherwise donate is a quiet waste. Once you’re 70½, a qualified charitable distribution lets you send money straight from a traditional IRA to a charity completely tax-free, and it counts toward your required minimum distribution — up to a generous annual limit that’s indexed for inflation (well over $100,000). Charitable bequests work similarly: a charity that inherits your traditional IRA pays no tax on it. Either way, that money was destined to escape tax entirely. Convert it first and you’ve paid income tax to fund a gift that would have been free.

4. Your heirs are in lower brackets than you

Under the SECURE Act, most non-spouse heirs must empty an inherited IRA within ten years, which pushes many people toward converting so their heirs inherit tax-free. But that logic flips if your heirs will pay less tax than you would. If you’re in the 35% bracket and your kids are early-career or in school in the 12% bracket, it’s cheaper overall for them to inherit the traditional IRA and pay 12% than for you to prepay 35% now. Convert only if your heirs’ rate is higher than yours, not lower.

5. You’d have to pay the conversion tax from the IRA itself

A conversion only works well if every converted dollar lands in the Roth and you pay the tax from outside cash. If you have to withhold the tax from the IRA, two bad things happen. Under 59½, the portion held back to pay the IRS is itself an early distribution, hit with the 10% penalty under IRC § 72(t). And at any age, peeling off money for taxes shrinks the amount that actually makes it into the tax-free account, gutting the benefit. No taxable-account cash to cover the bill is often reason enough to wait.

6. Converting this year would trip a cliff

A conversion piles onto your income for the year, and that spike can cost you more than the conversion saves. The usual suspects:

• Medicare premiums — a conversion can push you over an IRMAA threshold and raise your Part B and Part D premiums two years later. See whether a conversion will spike your IRMAA premiums.
• ACA subsidies — if you’re under 65 on a marketplace plan, conversion income can wipe out your premium tax credit, as we cover in the ACA subsidy cliff.
• Social Security taxation — a conversion can push more of your benefits into the taxable column, up to 85%.
• The 3.8% net investment income tax — the higher income can drag your dividends and capital gains into that surtax.

None of these mean “never convert” — they mean a conversion that ignores them can carry an effective tax rate far above your bracket, which is often a reason to convert less, or not this year.

7. You’re about to leave a high-tax state

Where you convert matters, not just when. Convert while you live in a high-tax state like California and you pay that state’s income tax on every converted dollar. If you’re planning to retire to a state with no income tax, waiting until after you move means those withdrawals escape state tax entirely. Prepaying California tax on money you could have pulled out state-tax-free a few years later is a self-inflicted cost. (One more reason to skip, or at least delay: you’ll need the money within about five years — the per-conversion five-year clock and the short runway for tax-free growth rarely justify the upfront tax on that short a horizon.)

When it still is worth it

To be fair to the other side: conversions earn their reputation in real situations. If you expect a higher bracket later — common for early retirees in low-income “gap years” before required distributions and Social Security start, which we cover in how much to convert before RMDs hit — converting is often a clear win. The same goes for protecting a surviving spouse from the compressed single brackets, or for heirs who will be in high brackets. The point of this post isn’t that conversions are bad; it’s that they’re a tool with a specific job, and forcing them where the math doesn’t support it just prepays tax you didn’t owe.

Quick answers

Is a Roth conversion always a good idea?

No. A conversion only pays off if your future tax rate is higher than today’s. If you’ll be in a lower bracket later, give to charity, or are about to move to a no-tax state, it often costs more than it saves.

Why is converting bad if I’ll be in a lower bracket later?

Because you’re prepaying tax at today’s higher rate to avoid a lower rate later. You hand the IRS the difference for no reason — waiting and withdrawing at the lower rate keeps that money.

Should I convert if I can’t pay the tax from savings?

Usually not. Paying the conversion tax out of the IRA shrinks the amount that reaches the Roth and, if you’re under 59½, adds a 10% penalty on the withheld portion. Outside cash to cover the tax is close to a requirement.

Next steps

A Roth conversion is prepaying a tax bill, and you should only prepay when the price is rising. If your future rate is lower, your money is headed to charity, your heirs are in low brackets, you’d fund the tax from the IRA, the conversion would trip a cliff, or you’re about to leave a high-tax state, the disciplined answer is to wait — or skip it. Knowing when not to convert is as valuable as knowing when to.

If you want the actual math for your situation — your bracket today versus retirement, your cash, your state, your heirs — book a meeting with our office here. It’s the same even-handed analysis behind everything in our work on Roth conversion and backdoor Roth tax planning, including the threshold question of Roth vs. traditional in the first place.

Disclaimer: This article is for educational purposes only and does not constitute investment, tax, or financial advice. The right answer depends on your specific brackets, balances, and timing. Always consult a qualified professional about your specific situation.