Can You Reverse a Roth Conversion? Custodian Errors and Fixes

You cannot reverse a Roth conversion. Once you move money from a traditional IRA, SEP IRA, SIMPLE IRA, or an employer plan like a 401(k) into a Roth IRA, the transfer is final and the full taxable amount is locked into that year’s income. The Tax Cuts and Jobs Act closed the door on undoing conversions starting January 1, 2018, and the only narrow way back is if your custodian made a processing error.

Why Conversions Became Irrevocable

Before 2018, a conversion came with a safety valve called recharacterization. If your investments dropped after the conversion, or the tax bill turned out larger than you expected, you could move the money back to a traditional IRA and treat the conversion as if it had never happened. The Tax Cuts and Jobs Act (P.L. 115-97) eliminated that option for any conversion completed on or after January 1, 2018.¹ Federal law now treats every Roth conversion as final.²

The practical effect is blunt. Convert $100,000 in January, watch the account fall to $70,000 by December, and you still owe income tax on the full $100,000. Nothing that happens to the investments after the transfer date changes the taxable amount.

The One Way Money Can Go Back: Custodian Error

The single situation where converted funds can return to a traditional IRA is a processing mistake by the financial institution. If you asked for a different type of transfer and the custodian converted the account to a Roth instead, the IRS treats that as a clerical error rather than a valid conversion, and the custodian can restore the funds to their original account.³

You need documentation showing your original instructions differed from what the custodian executed. The institution has to acknowledge the error and issue corrected tax forms. Regret over the tax bill or a market decline does not qualify. Neither does a change of heart.

Annual Contributions Are Different — Those You Can Still Undo

Recharacterization still exists for regular annual IRA contributions. If you put money into a Roth IRA for the year and later decide you would rather have it in a traditional IRA (or the reverse), you can request a trustee-to-trustee transfer that moves the contribution plus any earnings or losses attached to it.⁴

The deadline is the due date of your tax return, including extensions. If you filed on time but missed that deadline, you have up to six months after the original due date (extensions aside) to complete the transfer and file an amended return. For 2025 returns due April 15, 2026, that extended cutoff is October 15, 2026.⁴

This is worth stating plainly because the two operations are easy to confuse: a contribution you made directly to a Roth IRA can be recharacterized; a conversion from a traditional account into a Roth IRA cannot.

What to Do If You Already Regret the Conversion

If the conversion is already done, your options are limited to how you handle future years and what you do inside the Roth going forward. A few things matter.

Spread Future Conversions Across Years

You are not required to convert an entire traditional IRA balance in one transaction. The IRS lets you convert any amount, whether by trustee-to-trustee transfer, same-trustee transfer, or 60-day rollover.¹ Converting smaller portions across multiple years, sometimes called a Roth conversion ladder, is often the way to keep each year’s tax bracket manageable.

The timing rule is strict on one point: a conversion counts for the tax year in which it is completed. To have a conversion apply to 2026, the transfer must finish by December 31, 2026. Unlike annual contributions, which you can make up until the April filing deadline, conversions follow the calendar year with no grace period.⁵

Watch the Five-Year Rule Before Pulling Money Out

If part of the reason you want to undo the conversion is to get the money out, the five-year rule matters. Withdraw converted funds from your Roth IRA within five years of the conversion while you are under age 59½, and you may owe a 10% early withdrawal penalty on the taxable portion of that conversion.⁶

Each conversion has its own five-year clock that starts on January 1 of the conversion year. A $50,000 conversion in March 2026 begins its clock on January 1, 2026 and ends December 31, 2030. A separate conversion in 2027 runs its own clock through the end of 2031.⁶

The 10% penalty does not apply if you are 59½ or older, if you are permanently and totally disabled, if the distribution goes to your beneficiary or estate after your death, or if you withdraw up to $10,000 over your lifetime for a first home purchase.⁷

What to Check Before You Convert Next Time

Because there is no rewind, the checks that matter are the ones you run before pressing the button.

The Pro-Rata Rule

If your traditional IRA holds a mix of pre-tax and after-tax (non-deductible) contributions, you cannot cherry-pick the after-tax dollars for conversion. The IRS treats all of your traditional, SEP, and SIMPLE IRAs as one combined pool when calculating how much of a conversion is taxable.⁵ With $90,000 pre-tax and $10,000 after-tax across all those accounts, 90% of any conversion is taxable regardless of which specific account you drew from.

This aggregation catches people with large SEP IRA balances from self-employment the hardest. A $500,000 SEP IRA sitting alongside a smaller traditional IRA of mostly after-tax money can turn what looked like a low-tax conversion into a heavily taxable one. Total up every traditional, SEP, and SIMPLE IRA balance before you convert.

Medicare Premium Surcharges

A conversion raises your modified adjusted gross income for the year, and Medicare uses your MAGI from two years earlier to set the Income-Related Monthly Adjustment Amount (IRMAA) on Part B and Part D premiums. For 2026, IRMAA surcharges begin above $109,000 in MAGI for single filers and $218,000 for married couples filing jointly, based on 2024 returns.⁸ A single large conversion can push you into a higher IRMAA tier two years later; smaller conversions across several years can keep you under the thresholds.

Social Security Benefit Taxation

A conversion also feeds into the combined income calculation that determines how much of your Social Security benefits are taxable. Up to 50% of benefits become taxable once combined income tops $25,000 for single filers or $32,000 for joint filers, and up to 85% above $34,000 and $44,000 respectively.⁹ The tradeoff is that qualified Roth withdrawals in later years do not count toward combined income at all, so paying now can reduce the future taxation of benefits.

The Withholding Trap on 60-Day Rollovers

If you convert through a 60-day rollover instead of a direct trustee-to-trustee transfer, the distributing custodian may withhold federal tax from the distribution, typically 20% for employer plans or 10% for IRAs. That withheld money does not reach the Roth IRA, so the IRS treats it as a regular distribution from the traditional account. If you are under 59½, the withheld portion can trigger the 10% early withdrawal penalty on top of the income tax.

Two ways around this: ask for a direct trustee-to-trustee transfer, which involves no withholding, or replace the withheld amount from other savings inside the 60-day window so the full intended sum lands in the Roth. You then recover the withheld taxes as a credit at filing time.

Estimated Tax Payments

A conversion typically arrives without withholding, especially through direct transfers, and that lump of taxable income can create an underpayment penalty. To stay safe, your total withholding and estimated payments for the year need to equal at least the smaller of 90% of the current year’s tax or 100% of the prior year’s tax (110% if your prior-year adjusted gross income was above $150,000, or $75,000 if married filing separately).¹⁰¹¹ Hitting the prior-year safe harbor through quarterly Form 1040-ES payments or a bumped-up Form W-4 withholding is usually the cleanest route.

1
Internal Revenue Service. Retirement Plans FAQs Regarding IRAs
2
Office of the Law Revision Counsel. 26 USC 408A – Roth IRAs
3
Internal Revenue Service. Fixing Common Mistakes – Correcting a Roth Contribution Failure
4
Internal Revenue Service. Publication 590-A (2025), Contributions to Individual Retirement Arrangements (IRAs) – Recharacterizations
5
Internal Revenue Service. Instructions for Form 8606 (2025)
6
Internal Revenue Service. Publication 590-B (2025), Distributions from Individual Retirement Arrangements (IRAs) – Additional Tax on Early Distributions
7
Office of the Law Revision Counsel. 26 USC 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts
8
CMS.gov. 2026 Medicare Parts A and B Premiums and Deductibles
9
Office of the Law Revision Counsel. 26 USC 86 – Social Security and Tier 1 Railroad Retirement Benefits
10
Internal Revenue Service. Estimated Taxes
11
Internal Revenue Service. Form 1040-ES, Estimated Tax for Individuals