There is no Roth conversion age limit. Federal tax law lets you move money from a traditional IRA, SEP IRA, or an employer plan like a 401(k) into a Roth IRA at any age, whether you’re 25 or 85, and pay income tax on the converted amount now in exchange for tax-free growth later.1Internal Revenue Service. Retirement Topics – IRA Contribution Limits The one real age-related complication shows up once required minimum distributions start, because RMD dollars themselves cannot be converted.
No Age Cap, No Income Cap
The IRS permits rollover contributions to a Roth IRA regardless of the account holder’s age. Before 2010, conversions were closed to anyone with a modified adjusted gross income above $100,000, but the Tax Increase Prevention and Reconciliation Act of 2005 removed that ceiling for conversions starting in the 2010 tax year. Someone earning millions today can still convert.
Direct Roth contributions work differently, and that’s where most of the confusion starts. Direct contributions phase out by income: for 2026, single filers lose eligibility between $153,000 and $168,000 of MAGI, and joint filers between $242,000 and $252,000. The annual contribution cap is $7,500, or $8,600 at age 50 or older. None of those numbers apply to a conversion. You could convert $500,000 in a single year at any age, though every pre-tax dollar you convert lands on your tax return as ordinary income.
The absence of income limits on conversions is what makes the backdoor Roth possible for high earners: contribute nondeductibly to a traditional IRA, then convert. That strategy only works cleanly if you don’t already hold pre-tax money in other traditional IRAs, because of the pro-rata rule discussed below.
The Real Age Rule: RMDs Can’t Be Converted
Under current law, required minimum distributions begin at age 73. That threshold rises to 75 starting in 2033 under the SECURE Act 2.0. Roth IRAs are exempt from RMDs during the original owner’s lifetime, which is one of the main reasons people convert in the first place.
Once you’re of RMD age, the sequencing matters. The IRS treats required minimum distributions as ineligible for rollover into any retirement account, including a Roth IRA.2Internal Revenue Service. Retirement Plans FAQs Regarding IRAs – Section: Required Minimum Distributions The first dollars leaving your traditional IRA in any given year are treated as satisfying the RMD, so you can’t skip ahead to the conversion. You have to take the full RMD first, then convert additional amounts from what’s left.
If RMD money accidentally lands in a Roth IRA, the IRS classifies it as an excess contribution and charges a 6% excise tax for each year it stays there. You can fix it by withdrawing the excess (plus attributable earnings) before your filing deadline, but the simpler play is to take the RMD early in the year, park it in a taxable account, and run the conversion separately.
Age 59½ and the Five-Year Clock
Each Roth conversion starts its own five-year clock on January 1 of the conversion year. That clock decides whether the 10% early withdrawal penalty applies if you pull the converted amount out before age 59½. Convert $50,000 at 53 and withdraw it at 56, and the taxable portion of that conversion can be hit with the 10% penalty because the window hasn’t closed.
Once you turn 59½, the penalty on converted amounts disappears regardless of how long ago you converted. A 62-year-old who converted last year can withdraw those converted dollars penalty-free right now. The five-year rule really only bites people who convert in their 40s or early 50s and then need the money back quickly. A separate five-year rule governs whether Roth earnings come out tax-free, and that clock starts with your first-ever Roth contribution or conversion, not with each new conversion.
Medicare Premium Impact for Converters 63 and Older
If you’re 63 or older, a conversion can affect more than income tax. The converted amount adds to your MAGI, and Medicare uses your MAGI from two years earlier to set Part B and Part D premiums through the Income-Related Monthly Adjustment Amount, known as IRMAA. A large conversion in one year can raise your Medicare premiums two years later, sometimes by hundreds of dollars a month.
That isn’t a reason to skip converting. It’s a reason to model the full cost. If a $100,000 conversion saves $30,000 in future taxes and adds $5,000 to one year of Medicare premiums, the math can still favor converting. Where people get hurt is doing a large conversion without seeing the IRMAA hit coming. You can appeal an IRMAA surcharge after a qualifying life-changing event like retirement or divorce, but doing a Roth conversion is not on the qualifying list. Sizing the conversion to stay below the next IRMAA bracket is often the practical answer.
Inherited IRAs: A Boundary Worth Knowing
Age isn’t the only limit on who can convert. If you inherited a traditional IRA from someone other than your spouse, you cannot convert those inherited assets to a Roth. A surviving spouse can roll an inherited IRA into their own IRA and then convert; a non-spouse beneficiary has no such rollover option and generally must follow the inherited account’s distribution timeline, which under the SECURE Act is typically a 10-year depletion window.3Internal Revenue Service. Retirement Topics – Beneficiary
The Pro-Rata Rule When You Have Mixed Balances
The IRS treats all of your non-inherited traditional IRAs as one combined pool when working out how much of a conversion is taxable. If you hold $90,000 of pre-tax money in a rollover IRA and add a $10,000 nondeductible contribution to a separate traditional IRA, the IRS sees a single $100,000 balance that’s 90% pre-tax. Every dollar you convert will be 90% taxable, no matter which account you pull from.
You track any nondeductible basis on Form 8606, Part I; Part II runs the taxable/nontaxable calculation at conversion time.4IRS. 2025 Instructions for Form 8606 – Nondeductible IRAs The balance measurement date is December 31 of the conversion year, so shuffling money between IRAs mid-year won’t help. One workaround: if your employer’s 401(k) accepts incoming rollovers, moving pre-tax IRA money into that plan removes it from the pro-rata calculation.
How to Actually Do the Conversion
Conversions must be completed by December 31 of the tax year you want them to count for. Unlike IRA contributions, which you can make up to the April filing deadline, conversions follow the calendar year strictly. Most custodians set the year-end cutoff at 4 p.m. Eastern on the last business day of the year, and processing times vary, so leaving it to late December is risky.
Three mechanics are available:
- Trustee-to-trustee transfer. Your current custodian sends the assets directly to the Roth IRA provider. You never handle the funds. This is the cleanest option and the default at most institutions.
- Direct rollover. The custodian issues a check payable to the new trustee “for the benefit of” you, and the check goes to the receiving institution rather than your bank account.
- Indirect (60-day) rollover. The funds come to you personally, and you have 60 days to deposit them into a Roth IRA. Miss the window and the whole distribution becomes taxable without conversion treatment.5Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions
Most people should stick with the trustee-to-trustee transfer.6Internal Revenue Service. Retirement Plans FAQs Regarding IRAs The 60-day rollover invites mistakes, and if a plan custodian withholds 20% for taxes on the distribution, you’d need to add that 20% back from other funds to complete the full rollover.
When you initiate the conversion, the custodian will ask whether to withhold taxes. Withholding is tempting because it feels like paying the bill upfront, but every withheld dollar is a dollar that doesn’t make it into the Roth to grow tax-free. Under 59½, it’s worse: the withheld amount is treated as an early distribution and can trigger a 10% additional tax unless an exception applies.7Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions The usual better move is to decline withholding, convert the full amount, and pay the tax from a taxable account, making quarterly estimated payments if the conversion is large enough to trigger an underpayment penalty.
At tax time, the sending custodian issues a Form 1099-R and the receiving Roth custodian files a Form 5498. You report the taxable portion on your return and file Form 8606 to document the conversion and any nondeductible basis.4IRS. 2025 Instructions for Form 8606 – Nondeductible IRAs