A traditional IRA hands your heirs a decade of forced taxable income at their peak salary. An inherited Roth grows untouched and comes out tax-free. Whose bracket pays is the whole question.
Since the SECURE Act, most non-spouse heirs must empty an inherited IRA within ten years — Roth or traditional, same deadline. Everything else about that decade is different:
| Inside the ten years | Inherited traditional IRA | Inherited Roth IRA |
|---|---|---|
| Withdrawals taxed? | Yes — ordinary income, at the heir’s rate | No — qualified distributions are tax-free |
| Forced annual withdrawals? | Often yes — if the owner’s own RMDs had begun | No — a Roth owner has no required beginning date |
| Stacks on the heir’s salary? | Yes — every withdrawn dollar | Never |
| Can it grow untouched to year ten? | Usually not | Yes — the full decade, then out tax-free |
A traditional IRA carries a deferred income-tax bill that someone must pay. Die with the account intact and the bill transfers to your heirs — due within ten years, at their rates, in their circumstances. And their circumstances are usually the worst possible ones for it: heirs tend to inherit in their fifties, at peak salary, so a hypothetical $2,000,000 account becomes roughly $200,000 a year of forced income stacked on top of their highest-earning years — often taxed in brackets the account’s owner never occupied in their life.
Converting reverses the assignment. The tax gets paid now, at your rate — ideally inside the low-bracket window between retirement and RMDs. The comparison is then simple to state and personal to answer: your rate in the window, versus their rate at their peak. When the window rate is lower — and for many households it’s the lowest rate any generation of the family will ever see on that money — prepaying converts a bad decade into a clean one.
The estate-tax red herring: conversion doesn’t shrink the taxable estate — both account types are included. For most families the estate tax never applies anyway. The inheritance question is an income-tax question, and pretending otherwise is how it goes unplanned.
Two mechanical details decide how clean the Roth handoff actually is:
And one non-tax detail outranks everything above: the beneficiary form at the custodian controls who inherits — not the will. The cheapest fix in estate planning, and the most expensive to skip.
A fair comparison lists the cases where prepaying loses:
Which column your household lands in isn’t a philosophy — it’s your window rate, your heirs’ likely rates, your Medicare and Social Security exposure along the way, and what the account would force out under the 10-year rule. The guide walks the chain; the calculator runs your numbers, including what your heirs would keep.
Generally no. Qualified distributions from an inherited Roth IRA are free of federal income tax, and because a Roth owner has no required beginning date, most non-spouse heirs owe no annual withdrawals — just the ten-year deadline. If the original owner hadn’t yet satisfied the five-year account clock, heirs wait out the remainder before earnings are qualified.
Dollar for dollar of account balance, heirs generally keep more from a Roth: distributions are tax-free, nothing stacks on their salary, and the account can grow untouched for the full ten years. But the comparison isn’t free — converting a traditional IRA to Roth means the owner pays the tax up front. Which generation’s tax rate is lower decides whether prepaying made sense.
Not directly — both account types are included in the taxable estate. What conversion changes is income tax: it settles the deferred income-tax bill at the owner’s rate instead of passing it to heirs at theirs. For most families the estate tax never applies, and the income-tax question is the whole question.
Several common cases: heirs expected to be in lower brackets than the owner’s conversion rate; accounts intended for charity, since a charity pays no income tax on a traditional IRA it receives; and situations where paying the conversion tax would compromise the owner’s own retirement security, which always comes first.
Your window rate, your RMDs, their decade — free, in about 3 minutes.
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