Should Your Heirs’ Expected Tax Rates Change How Much You Convert to Roth?

Whose tax are you choosing to pay?

Converting money from your traditional IRA to your Roth IRA generally makes the previously untaxed amount taxable to you in the conversion year. You are choosing a current tax cost in exchange for potential future Roth benefits. [1]

Qualified Roth IRA distributions are tax-free, including qualifying distributions to beneficiaries. The five-tax-year requirement still matters, so an heir should not assume that every recently opened Roth can immediately distribute earnings tax-free. [2]

Many adult children inheriting after 2019 must empty an inherited IRA by the end of the tenth year after the owner’s death. A traditional IRA can therefore add taxable withdrawals during their working years. Some beneficiaries qualify for exceptions, and annual distribution requirements depend on the circumstances. [3]

That possible overlap makes an heir’s tax situation relevant. It does not establish what the heir’s rate will be when withdrawals occur. Retirement, a career change, a different state of residence, or a later inheritance can change the answer.

Which rates should you compare?

Use the tax attributable to the additional income. In a progressive tax system, higher rates apply to successive portions of taxable income; the top bracket does not apply to every dollar. Comparing your average tax rate with your child’s top bracket can misstate the opportunity. [4]

Have your tax professional estimate the added cost of the conversion amount you are considering, including applicable state taxes and relevant income-based costs. Then compare plausible tax costs on the heir’s eventual withdrawals. A larger conversion can push more of your income into a higher tax bracket.

Treat each intended beneficiary separately before combining the family picture. A child in a demanding career, a sibling already retired, and a spouse continuing the household plan may have different needs and tax circumstances. One person’s current salary should not determine how you treat the entire IRA.

What else belongs in the family comparison?

Compare total after-tax resources using consistent spending, investment, and timing assumptions. Research on Roth conversion arithmetic shows why the source of the tax payment and the comparison period matter. Money used to pay conversion tax has an opportunity cost; a larger Roth balance alone does not establish a larger family benefit. [5]

Include the assets left outside the retirement account. If conversion taxes consume savings you might need for care, a move, or ordinary spending, the apparent estate benefit may ask too much of your present life. The money you retain should support the same retirement in each scenario.

Also avoid assuming an adult child can fix the account choice later by rolling an inherited IRA into their own IRA. Federal law denies that rollover treatment to nonspouse beneficiaries. The inheritance requires its own withdrawal plan. [6]

How should this change the amount you convert?

Compare a smaller conversion, a larger conversion, and leaving the money in the traditional IRA. Test a lower and higher plausible heir tax cost, as well as the possibility that you use more of the account yourself. Ask which amount still serves your priorities when the most favorable inheritance assumption does not occur.

If the benefit depends on one child remaining in a high bracket for many years, keep that uncertainty visible. If a measured conversion supports your retirement and improves several reasonable family outcomes, the heirs’ tax picture may strengthen the reason to proceed. Revisit the amount as your needs and their lives change.

To connect this decision with the practical handoff, read What Should Your Heirs Know Before Inheriting a Retirement Account?.