She Inherits Her Father’s $400,000 IRA and Wants to Convert It to a Roth. The IRS Doesn’t Allow It

Here is a hypothetical case. Dana, an adult daughter, is named beneficiary of her father’s traditional IRA, which holds $400,000. She wants to convert the whole account to a Roth IRA so that future growth comes out tax free, and her custodian turns her down. Federal law sides with the custodian. A non-spouse heir can’t convert an inherited IRA. She can still decide when, and how fast, that money becomes taxable income.

Why Non-Spouse Heirs Can’t Convert

A Roth conversion counts as a rollover. Under 26 U.S.C. § 408A(e)(1)(B)(i), a qualified rollover contribution from an IRA has to meet the requirements of section 408(d)(3). Treasury Regulation 26 CFR 1.408A-4, A-1(a) applies that test to conversions. Paragraph A-1(c) says any converted amount is treated as a distribution plus a rollover contribution, even when the money moves trustee-to-trustee.

Section 408(d)(3) is where Dana’s plan fails. An IRA counts as inherited when the beneficiary “acquired such account by reason of the death of another individual” and was not that person’s surviving spouse (§ 408(d)(3)(C)(ii)). Rollover treatment doesn’t apply to these accounts. Publication 590-B (2025) says it simply: a non-spouse heir “can’t treat the inherited IRA as your own” and “can’t roll over any amounts into or out of the inherited IRA.” The one move she has is a trustee-to-trustee transfer into another IRA kept in her father’s name for her benefit.

A Surviving Spouse Can Convert

If Dana’s mother had inherited the account, she would have had three choices: name herself as the owner, roll the money into her own IRA, or stay on as beneficiary. Once she owns the IRA, Publication 590-A lets her convert from any traditional IRA, and the converted amount “may be included in gross income and subjected to ordinary income tax.” In any year she owes a required minimum distribution, she has to take it before converting. Under A-6, the first dollars withdrawn that year count toward the RMD.

Inherited 401(k)s Follow Different Rules

Employer plans give non-spouse heirs a Roth path that inherited IRAs don’t. Publication 590-A says a non-spouse designated beneficiary of a deceased employee can roll an eligible rollover distribution into a Roth IRA, but only “by a direct trustee-to-trustee transfer into an inherited Roth IRA.” The taxable amount goes into her income, and inherited-account distribution rules still apply. If her father had moved his 401(k) into an IRA before he died, Dana inherits an IRA and this option is gone.

Dana’s 10-Year Payout Clock

Under Publication 590-B, an eligible designated beneficiary is a surviving spouse, a minor child, a disabled or chronically ill person, or someone not more than 10 years younger than the owner. Dana, a healthy adult daughter, doesn’t fit any of those categories. She has to empty the account by December 31 of the year containing the 10th anniversary of her father’s death. If he died in 2025, for example, her deadline is December 31, 2035. If he died before his required beginning date, she owes nothing until the 10th year. If he died on or after that date, she also has to take annual required minimum distributions in the years in between.

Spreading Withdrawals Keeps Income in Lower Brackets

Hypothetical assumptions: tax year 2026, Dana files single, earns $100,000 in wages, takes the $16,100 standard deduction, and her father died before his required beginning date. To keep the math simple, the account doesn’t grow.

1. Taxable income before any IRA money: $100,000 − $16,100 = $83,900.
2. Even split over the payout period: $400,000 ÷ 10 = $40,000 per year. Taxable income becomes $83,900 + $40,000 = $123,900. In 2026, the 24% rate applies above $105,700 and 32% starts above $201,775, so her top dollars are taxed at 24%.
3. Lump sum in one year: $83,900 + $400,000 = $483,900. The 35% rate applies above $256,225 and 37% above $640,600, so her top dollars are taxed at 35%.

Brackets are adjusted for inflation each year, investment growth makes the withdrawals bigger, and state income tax adds to the bill. The inherited-IRA conversion ban is one of several quiet rules that can drain a retirement account, and we charted the rest in a free tax trap map.

Using Withdrawals to Fund Her Own Roth

Inherited IRA money can supply the cash for Dana’s own Roth moves, within limits.

• Roth contributions: Eligibility depends on compensation, which is “what you earn from working.” Her wages qualify her. Inherited distributions don’t count, although the cash can stand in for the paycheck dollars she contributes. Income limits on Roth contributions still apply.
• Converting her own IRA: She can use withdrawals to pay the tax on converting her own traditional IRA. Under A-9, the converted amount counts as income “for all purposes,” including Social Security taxation. That income piles on top of her inherited withdrawals for the year.
• Basis: Section 408(d)(2)(A) treats all of a person’s IRAs as one contract. Inherited basis gets different treatment, though: a non-spouse heir can’t combine it with her own, and she has to file separate Forms 8606.

Who These Strategies Don’t Suit

An even split works best when income stays flat. If Dana plans to retire before year 10, taking out more money out in her lower-income years may cost less. If her own conversion would push her top dollars from 24% into 32%, the extra tax may wipe out the benefit. If she has no earned income, Roth contributions are off the table. If she needs the cash now, it makes little sense to tie up extra savings to pay conversion taxes.

Her first step is to find out whether her father died before or after his required beginning date, because that decides whether she owes annual withdrawals. After that, she can set each year’s withdrawal against the IRS bracket thresholds that apply to that year.

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