Does Converting to a Roth IRA Change What Heirs Owe in Capital Gains?
When someone hears that inherited investments get a “step-up in basis,” it’s natural to wonder whether converting retirement savings to a Roth IRA might work the same way for the people who eventually inherit them. It doesn’t, and understanding why involves keeping two separate tax rules apart in your mind.
The short answer
Converting a traditional IRA to a Roth IRA does not create a capital-gains step-up in basis for heirs, because retirement accounts were never subject to that rule to begin with. What changes with a conversion is how withdrawals are taxed as ordinary income, not how any embedded investment gain is measured. Heirs of a Roth IRA generally receive tax-free qualified withdrawals under the account’s rules, but that’s a different mechanism entirely from step-up in basis.
Two rules that sound similar but aren’t
- Step-up in basis. Adjusts the cost basis of certain inherited assets — like a holding in a taxable brokerage account or real estate — to their value at the original owner’s death, which can reduce the capital gains tax an heir owes if they sell soon after inheriting.
- Retirement account tax treatment. Determines whether withdrawals from an inherited IRA are taxed as ordinary income (traditional) or generally not taxed (Roth), based entirely on the type of account, not on any basis adjustment.
Retirement accounts work under a completely different framework than capital assets. Money inside an IRA, whether traditional or Roth, isn’t taxed using capital-gains rules while it sits inside the account. Growth inside the account isn’t tracked as individual purchases and sales the way a brokerage account is. Instead, the tax treatment depends on whether the account is traditional (generally taxed as ordinary income on withdrawal) or Roth (generally not taxed on a qualified withdrawal, because tax was already paid going in or at conversion).
What heirs inherit with a traditional IRA
A non-spouse heir of a traditional IRA typically has to draw down the account within a period set by the government and changing over time, and each withdrawal is generally taxed as ordinary income to the heir, the same way it would have been taxed to the original owner. There’s no capital-gains step-up available to erase that tax bill, because the money was never in a capital-gains regime.
What heirs inherit with a Roth IRA
A non-spouse heir of a Roth IRA also typically has to draw the account down within a set period, but qualified withdrawals are generally free of income tax, assuming the account met the applicable holding requirements. This is the real benefit of a Roth conversion for heirs — not a change to basis, but a shift in which tax bucket the eventual withdrawals fall into. The heir avoids the ordinary-income hit a traditional IRA withdrawal would have triggered, which is a meaningfully different outcome from a capital-gains step-up, even though both can reduce what someone ultimately owes.
Why the mix-up happens
The confusion is understandable. Both step-up in basis and Roth conversion are strategies people discuss in the context of passing on wealth efficiently, and both can reduce a tax bill for the next generation. But they operate through entirely separate parts of the tax code — one adjusts an asset’s cost basis for capital-gains purposes, the other changes which category of income a withdrawal falls into. Conflating them can lead to unrealistic expectations about how much tax relief a Roth conversion actually provides to a beneficiary.
A practical habit
Rather than assuming a Roth conversion functions like a step-up, it helps to think of it as prepaying and reclassifying tax now so that future withdrawals — by you or by an heir — fall into the tax-free category instead of the ordinary-income category. Whether that trade makes sense depends on individual circumstances, current and expected future tax situations, and the rules governing inherited retirement accounts, which are set by the government and subject to change. Because these rules shift over time and vary by relationship to the original owner, it’s worth confirming the current framework directly rather than relying on assumptions carried over from other kinds of inherited property.