5 Clues a Roth Conversion May Be a Bad Fit for You

Turning a traditional IRA into a Roth IRA can look like a savvy tax strategy, but for some families the upfront tax cost ends up outweighing the later benefit. In a few common situations, the numbers work against a conversion.

A Roth conversion swaps a tax bill now for the possibility of tax-free withdrawals later. Federal rules generally include the converted amount in income in the year it is received, and the IRS permits money from a traditional IRA to be moved into a Roth IRA. That does not mean the move is right for everyone. For many people approaching retirement, the better answer is to leave the money where it is. Here are five warning signs that a conversion may not help you.

Your Tax Rate Is Higher Now Than It Will Be Later

A conversion tends to work best when your current tax rate is no higher than the rate you expect to face when you eventually withdraw the money. Under current tax brackets, married couples filing jointly reach 12% at incomes above $24,800, 22% above $100,800 and 24% above $211,400.

Example Household A is married filing jointly and has taxable income of $150,000, then converts $50,000.

1. New taxable income: $150,000 + $50,000 = $200,000. That remains below $211,400, so the entire conversion is taxed in the 22% bracket.
2. Tax on the conversion: $50,000 × 22% = $11,000.
3. If the couple expects to be in the 12% bracket in retirement, withdrawing the same $50,000 later would cost $50,000 × 12% = $6,000.
4. Extra cost of converting: $11,000 − $6,000 = $5,000.

A planned move to a state without income tax can make the difference even larger. If you convert before relocating, you may owe state tax that a later withdrawal could avoid. Future required minimum distributions, pension income, or a surviving spouse filing as single can also push retirement tax rates higher. The years after your last paycheck and before RMDs begin are often the best time to consider a conversion.

You Pay the Conversion Tax Out of the IRA

Go back to Household A. If the $11,000 tax bill is withheld from the IRA itself, only $39,000 reaches the Roth. The penalty waiver for conversion transactions applies only to the amount actually converted. The withheld portion is treated as a regular distribution, and if the owner is under 59½, it can trigger the 10% additional tax: $11,000 × 10% = $1,100. A smaller conversion that matches cash you can cover outside the IRA may be a better approach. If you have other money available, this problem may not matter.

You Need the Converted Money Within Five Years

Roth IRA withdrawals follow a specific order: regular contributions come out first, followed by conversion and rollover contributions on a first-in, first-out basis, with taxable amounts removed before earnings. Amounts converted and withdrawn within the five-taxable-year period are treated as taxable for penalty purposes. Earnings are tax-free only in a qualified distribution, which generally requires both reaching age 59½ and meeting a separate five-taxable-year rule. If you expect to need the money soon, there is also less time for tax-free growth to offset the upfront cost. The case for converting improves if you are already past 59½ and can leave the funds invested for many years.

You Sit Just Below an IRMAA Tier or Rely on ACA Credits

The standard monthly Medicare Part B premium is $202.90. Joint filers with modified adjusted gross income above $218,000, or single filers above $109,000, pay $284.10 instead, plus a separate Part D surcharge.

Example Household B is married, both spouses are on Medicare, and their modified adjusted gross income is $200,000 before a $50,000 conversion.

1. New MAGI: $200,000 + $50,000 = $250,000, which falls into the bracket above $218,000 and up to $274,000.
2. Part B surcharge: $81.20 × 12 months × 2 people = $1,948.80.
3. Part D surcharge: $14.50 × 12 months × 2 people = $348.

People who are not yet on Medicare can face a similar issue. Marketplace premium tax credits are based on household income, and conversion income can reduce the subsidy. One way to manage the effect is to convert only enough to stay below the next income threshold. Even if a one-time surcharge stings, it may still be worthwhile if it helps reduce larger required distributions later.

Your IRA Is Headed to Charity

A charity does not owe income tax on an inherited traditional IRA. If you convert first, you pay tax on money that could have passed to the charity tax-free. Qualified charitable distributions offer another path. They are excluded from income for eligible account owners and can count toward required minimum distributions.

The case for converting for heirs is also weaker than many investors assume. The basic exclusion amount for estates is $15,000,000, and recent estate tax filings show far more nontaxable returns than taxable ones. If your heirs are in high tax brackets and only a small portion is meant for charity, converting the family share can still make sense.

Run These Checks Before You Convert

Before moving money, compare your current marginal tax rate with the rate you expect in retirement, including state taxes. Make sure you have enough cash outside the IRA to pay the bill, that the funds can remain untouched for at least five years, and that your modified adjusted gross income stays within the Medicare and ACA thresholds you care about. If two or more of these warning signs apply, partial conversions spread over several years, qualified charitable distributions, or no conversion at all may be the smarter choice.