A Roth conversion from an inherited IRA is only available to a surviving spouse, and only after the spouse rolls the account into their own IRA. Every other beneficiary is blocked by federal law from converting an inherited IRA, with one narrow exception: a non-spouse who inherits a pre-tax employer plan account can direct a trustee-to-trustee transfer straight into an inherited Roth IRA, which functions as a taxable conversion. Whether a conversion is even on the table depends entirely on your relationship to the person who died and, for non-spouses, on where the money currently sits.
Why Non-Spouse Beneficiaries Cannot Convert
The prohibition is statutory. Under 26 U.S.C. § 408(d)(3)(C), the normal rollover rules do not apply to any amount received by an individual from an inherited IRA, and any transfer out of the account is not excluded from gross income.1Office of the Law Revision Counsel. 26 USC 408 – Individual Retirement Accounts The statute defines an account as inherited when someone acquires it by reason of another individual’s death and is not that person’s surviving spouse. Because a Roth conversion is a form of rollover, the bar covers conversions as well.
IRS Publication 590-B says the same thing in plainer terms: if you inherit a traditional IRA from anyone other than your deceased spouse, “you can’t roll over any amounts into or out of the inherited IRA.”2Internal Revenue Service. Publication 590-B, Distributions From Individual Retirement Arrangements (IRAs) The funds have to stay inside the inherited IRA structure until you take a taxable distribution. Once that distribution lands in your bank account, it is ordinary income for the year, and it cannot then be contributed or converted into a Roth because it does not qualify as an eligible rollover.
The Employer Plan Exception
Non-spouse beneficiaries have one workaround, and it only works before the money reaches an IRA. If you inherit a pre-tax account inside an employer-sponsored plan (a 401(k), 403(b), or governmental 457(b)), 26 U.S.C. § 402(c)(11) lets a non-spouse designated beneficiary direct a trustee-to-trustee transfer from the employer plan into an inherited IRA, and the statute specifically allows the receiving account to be either a traditional IRA or a Roth IRA.3Office of the Law Revision Counsel. 26 USC 402 – Taxability of Beneficiary of Employees Trust A transfer to an inherited Roth IRA functions as a taxable conversion: you pay ordinary income tax now on the pre-tax amount, and the inherited Roth grows tax-free thereafter.
This only works as a direct transfer from the plan. If the employer forces a distribution to you first, or you move the funds into an inherited traditional IRA and then try to convert, you lose the option. The resulting inherited Roth IRA is still subject to the 10-year distribution rule, but withdrawals come out tax-free. Coordinate with the plan administrator before any money moves.
How a Surviving Spouse Converts
Surviving spouses are the only beneficiaries with a straight path from an inherited traditional IRA to a Roth. It is a two-step process. First, roll the inherited IRA into your own traditional IRA. Then convert some or all of the balance to a Roth.
The rollover step works because § 408(d)(3)(C) explicitly excludes surviving spouses from the definition of an inherited account holder. Once the rollover is complete, the account is no longer inherited. It is your traditional IRA, and the IRS treats you as if you were the original owner.4Internal Revenue Service. Retirement Topics – Beneficiary From there, the conversion is an ordinary Roth conversion, subject to the same rules as any conversion you could have done with your own savings.
One timing rule catches people. If the deceased account holder had a required minimum distribution for the year of death but had not taken it, you must satisfy that RMD before completing the rollover.5Vanguard. RMD Rules for Inherited IRAs The year-of-death RMD cannot be rolled over or converted; it goes to income.
A spouse can also elect to keep the account as an inherited IRA. That may make sense for a spouse under 59½ who needs to draw on the money, because inherited IRA distributions are exempt from the 10% early withdrawal penalty at any age. But keeping the inherited IRA closes the conversion door. The rollover is the only gateway.
The SECURE 2.0 Spousal Election
Section 327 of the SECURE 2.0 Act created a separate election for surviving spouses who inherit defined contribution plan accounts, not IRAs. Under the election, the surviving spouse is treated as if they were the deceased employee for RMD purposes. If the deceased died before RMD age, the surviving spouse can delay distributions until the year the deceased would have reached RMD age, and RMDs use the more favorable Uniform Lifetime Table. The election also avoids the 10% early distribution penalty. It is an alternative to the spousal rollover, not a supplement. A spouse aiming for a Roth conversion still needs the rollover route.
What a Spousal Conversion Costs
The entire converted amount counts as ordinary income in the year of conversion. The IRS does not allow spreading it across multiple years or treating any portion as capital gains. Report the conversion on Form 8606 and include the taxable amount on Form 1040.6Internal Revenue Service. Retirement Plans FAQs Regarding IRAs
Bracket impact is where large conversions do damage. For 2026, a single filer’s income is taxed at 24% above $105,700 and at 32% above $201,775, with the 35% bracket starting at $256,225. For joint filers, 32% starts at $403,550.7Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 A surviving spouse with $80,000 in other income who converts $200,000 in one year lands at $280,000, well into the 32% bracket. Converting $50,000 per year over four years usually produces a materially lower total tax bill. Years of unusually low income right after a spouse’s death are often the best candidates for partial conversions.
The Pro-Rata Rule
A spouse who has their own traditional IRA contributions alongside the rollover needs to watch the pro-rata rule. The IRS treats every traditional, SEP, and SIMPLE IRA you own as a single pool when calculating how much of a conversion is taxable. You cannot cherry-pick only the after-tax portion.8Internal Revenue Service. Instructions for Form 8606
Suppose you rolled a $300,000 inherited traditional IRA into your name and also hold a separate traditional IRA with $100,000 in nondeductible contributions. Your total is $400,000, and 25% is after-tax. Convert $100,000 and only $25,000 is tax-free; the other $75,000 is taxable, even if you meant to convert “just the after-tax part.” The ratio is measured across all your traditional IRAs as of December 31 of the conversion year.
Medicare Premium Surcharges
A large conversion can trigger income-related monthly adjustment amounts on Medicare Part B and Part D. Medicare uses modified adjusted gross income from two years prior, so a conversion in 2024 shows up in 2026 premiums. The standard 2026 Part B premium is $202.90 per month, rising with income. The first surcharge tier hits at $109,000 for single filers and $218,000 for joint filers, raising the monthly Part B premium to $284.10. At the top tier ($500,000 single, $750,000 joint), Part B is $689.90 per month, and Part D carries its own surcharges at the same thresholds.9Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles For a spouse near the first threshold, a $150,000 conversion can add thousands in premiums two years later, and the cost never appears on the tax return.
Paying the Tax and the Five-Year Clock
Pulling money out of the newly converted Roth to pay the tax bill is a common and expensive mistake. If you are under 59½ and withdraw converted amounts within five years of the conversion, those withdrawals face a 10% early distribution penalty on top of the income tax you already owed.10Internal Revenue Service. Topic No. 557, Additional Tax on Early Distributions From Traditional and Roth IRAs Pay the tax from money outside the retirement account whenever you can.
Each conversion also starts its own five-year clock. Earnings on converted amounts qualify for tax-free withdrawal only after both the five-year period has passed and you have reached 59½. The five-year period begins on January 1 of the year of conversion, whatever month you actually convert.11Office of the Law Revision Counsel. 26 USC 408A – Roth IRAs For a spouse already past 59½, this is mostly a technicality; converted principal can always come out without penalty. For a younger spouse, it is a real constraint, and staggering conversions across years means each slice has its own countdown.
Large conversions can also create an estimated tax obligation. The safe harbor protects you from underpayment penalties if you pay at least 100% of last year’s total tax, or 110% if your AGI exceeded $150,000. Increasing withholding on wages or pension payments is treated as paid evenly through the year, which is useful for late-year converters who realize the shortfall in December.
What Non-Spouses Can Do Instead
Since a non-spouse cannot convert money already sitting in an inherited IRA, the planning question shifts to how you take the required distributions. The SECURE Act of 2019 replaced the old stretch IRA with a 10-year distribution deadline for most non-spouse heirs of owners who died on or after January 1, 2020. The entire balance must be gone by December 31 of the tenth year after death.12Internal Revenue Service. Internal Revenue Bulletin 2024-33 – Section 401(a)(9)(H)
Whether annual RMDs are required inside that window depends on when the owner died relative to their required beginning date. If the owner died before it, you generally have flexibility on timing as long as the account is empty by year 10. If the owner died on or after it, you must take annual RMDs in years one through nine based on your life expectancy, with the balance due in year 10.5Vanguard. RMD Rules for Inherited IRAs
A small group of non-spouse heirs (minor children of the owner until age 21, disabled or chronically ill individuals, and beneficiaries not more than 10 years younger than the deceased) are eligible designated beneficiaries and can stretch distributions over their own life expectancy instead.4Internal Revenue Service. Retirement Topics – Beneficiary
With no conversion available, the lever you do control is timing. Waiting until year 10 and taking one lump sum is almost always the wrong move: $500,000 in a single year pushes most people into the 32% or 35% bracket, while $50,000 per year over 10 years may keep the same total in the 22% or 24% range. Map your expected income across the 10 years and load distributions into low-income years: gaps between jobs, years with large deductions, or years before Social Security begins. Watch the same IRMAA thresholds that affect spousal conversions; distributions above $109,000 (single) or $218,000 (joint) can raise your Medicare premiums two years later.
Qualified Charitable Distributions
A beneficiary age 70½ or older who does not need the money for living expenses can reduce the tax hit through qualified charitable distributions. A QCD lets you transfer up to $111,000 per year (inflation-adjusted for 2026) directly from a traditional or inherited traditional IRA to a qualifying charity. The distribution satisfies your RMD for the year and is excluded from gross income entirely. The money must go directly from the IRA custodian to the charity; if it passes through your hands, it counts as taxable income and you would need to itemize to claim a deduction instead. For a non-spouse working through the 10-year window, QCDs can absorb distributions in years that would otherwise cross into a higher bracket.