A backdoor Roth IRA for high-income earners is a two-step workaround: you contribute to a traditional IRA on a nondeductible basis, then convert those dollars to a Roth IRA. Both steps are allowed on their own under the tax code, and putting them together lets you get money into a Roth even when your income is well past the direct-contribution limits. For 2026, single filers with modified adjusted gross income of $168,000 or more, and married couples filing jointly at $252,000 or more, cannot contribute to a Roth IRA directly at all.1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 Neither the contribution to a traditional IRA nor a Roth conversion carries an income limit, which is why the workaround exists.
Who the Strategy Is For
For 2026, single filers get the full $7,500 Roth contribution below $153,000 of MAGI, a partial contribution between $153,000 and $168,000, and nothing above that. Married couples filing jointly phase out between $242,000 and $252,000.1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 If you contribute directly to a Roth anyway and your income turns out to be too high, the IRS charges a 6% excise tax on the excess for every year it stays in the account.2Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts and Annuities The backdoor route sidesteps that entirely.
The Two Steps
Step one is a nondeductible contribution to a traditional IRA. The 2026 limit is $7,500, or $8,600 if you’re 50 or older.3Internal Revenue Service. Retirement Topics – IRA Contribution Limits Anyone with earned income can make this contribution regardless of MAGI. Because your income is too high for the deduction, you designate the contribution as nondeductible. Those dollars have already been taxed, so they won’t be taxed again when they move into the Roth.
Step two is the conversion. Federal law places no income restriction on Roth conversions.4Office of the Law Revision Counsel. 26 USC 408A – Roth IRAs You tell your brokerage to move the funds from the traditional IRA into a Roth IRA. A trustee-to-trustee transfer between accounts at the same institution is the cleanest way to do it. If you take a distribution and try to redeposit it yourself instead, you have 60 days to complete the rollover or the IRS treats it as a taxable distribution.5Internal Revenue Service. Topic No. 413, Rollovers From Retirement Plans Miss that window and you’ll owe a 10% early withdrawal penalty on top of the tax if you’re under 59½.6Office of the Law Revision Counsel. 26 USC 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts
Watch the calendar. Conversions must be completed by December 31 to count for that tax year. Contributions can be made up until the April filing deadline, but a January conversion belongs to the year you did it, not the prior one. Converting soon after the contribution, before the money accrues meaningful earnings, keeps the taxable portion of the conversion close to zero.
The Pro-Rata Rule Is Where Most People Get Burned
You cannot simply convert your $7,500 in new nondeductible contributions and leave older pre-tax IRA money alone. The IRS treats every traditional, SEP, and SIMPLE IRA you own as one combined pool.7Office of the Law Revision Counsel. 26 USC 408 – Individual Retirement Accounts Every dollar that leaves is a proportional mix of pre-tax and after-tax money, regardless of which account it came from or how many brokerages you use.
Here’s what that looks like. Say you already have $93,000 in a traditional IRA from years of deductible contributions, and you add $7,000 in new nondeductible contributions. Total balance: $100,000. Your nondeductible basis is 7% of the total. If you convert $7,000 to a Roth, only $490 of that conversion is tax-free. The other $6,510 gets added to your taxable income and taxed at your marginal rate, which can reach 37% in 2026.8Internal Revenue Service. Federal Income Tax Rates and Brackets That wipes out most of the benefit.
The clean fix is to have a zero balance across all traditional, SEP, and SIMPLE IRAs by December 31 of the conversion year. If you have pre-tax IRA money, you can often roll it into your current employer’s 401(k), assuming the plan accepts incoming rollovers. This reverse rollover is permitted under federal law and isn’t subject to the one-rollover-per-year rule that applies to IRA-to-IRA transfers.9Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions Once the pre-tax dollars are parked in the 401(k), what remains in your IRAs is nondeductible basis, and the conversion becomes nearly tax-free.
Paperwork You Have to File
Form 8606 is the one that keeps you from being taxed twice on the same money. You use it to report the nondeductible contribution and to calculate the taxable portion of the conversion.10Internal Revenue Service. Form 8606 – Nondeductible IRAs File it every year you make a nondeductible contribution or take a distribution from an IRA where you have basis.11Internal Revenue Service. 2025 Instructions for Form 8606 Keep copies indefinitely. If the IRS later questions whether your conversion was taxable, you carry the burden of proving those dollars were nondeductible, and lost records can mean paying tax on the same money twice.
Form 1099-R arrives from your brokerage in January or February after the conversion. It reports the full conversion amount as a distribution from the traditional IRA. Box 7 usually shows Code 2 if you’re under 59½ or Code 7 if you’re 59½ or older.12Internal Revenue Service. 2025 Instructions for Forms 1099-R and 5498 Don’t be alarmed by seeing the whole conversion amount listed as a distribution. Form 8606 is what separates taxable from nontaxable on your return.
Form 5498 comes from your IRA custodian and reports contributions.13Internal Revenue Service. Form 5498 – IRA Contribution Information It may not show up until May, after you’ve already filed. That’s fine; it’s a confirmation for your records.
The Five-Year Clock on Converted Dollars
Each conversion starts its own five-year holding period, beginning January 1 of the year the conversion happened. Convert in October 2026 and the clock runs from January 1, 2026 to January 1, 2031. This only bites if you’re under 59½ and try to withdraw the converted amount early. Pull it out before both the five-year window closes and you turn 59½, and the IRS adds a 10% early withdrawal penalty on the taxable portion of the conversion.6Office of the Law Revision Counsel. 26 USC 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts For most backdoor Roth conversions, the taxable portion is a sliver of earnings, so the actual penalty exposure is small. Roth withdrawals also come out in a set order (regular contributions first, then conversions oldest-first, then earnings), which means the clock rarely affects anyone who isn’t draining their entire Roth.
Is the Strategy Actually Legal
The concern some taxpayers raise is that the IRS could collapse the two steps into a single disqualified direct Roth contribution under the step-transaction doctrine. That worry is largely theoretical. Informal IRS comments from 2018 indicated the agency was not focused on challenging backdoor Roth conversions, and congressional staff working on the 2017 Tax Cuts and Jobs Act treated the strategy as a legitimate use of existing law. The statute itself explicitly allows nondeductible traditional IRA contributions and separately allows Roth conversions at any income level.4Office of the Law Revision Counsel. 26 USC 408A – Roth IRAs Congress has considered proposals to restrict backdoor Roth conversions in recent years but hasn’t passed any.
Some practitioners recommend waiting a short period between the contribution and the conversion, sometimes until month-end, so the account earns a bit of interest and the two steps look distinct. Others convert the same day without issue. There is no IRS rule setting a required waiting period, and the statute treats all IRA distributions in a given year as a single distribution for tax purposes regardless of timing.7Office of the Law Revision Counsel. 26 USC 408 – Individual Retirement Accounts What matters more is bringing your total traditional IRA balance to zero by year-end.
Moving More Than $7,500: The Mega Backdoor Roth
If the standard IRA limit feels small next to your income, the mega backdoor Roth uses your 401(k) to move much larger sums into Roth accounts. For 2026, the combined annual cap on all 401(k) contributions (employee deferrals, employer match, and after-tax) is $72,000, or $80,000 if you’re 50 or older.1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
After you max out your regular pre-tax or Roth 401(k) deferrals ($24,500 for 2026) and account for any employer match, you contribute additional after-tax dollars up to the overall cap. You then convert those after-tax contributions to a Roth IRA or an in-plan Roth account. Because the principal was already taxed, only the earnings portion is taxable at conversion, and converting quickly keeps that small.
Two things have to be true. Your 401(k) plan must allow after-tax contributions beyond the standard deferral limit, and it must permit either in-service withdrawals or in-plan Roth conversions. Not every plan offers these features, so check with your plan administrator before counting on the strategy. Nondiscrimination testing rules may also cap what highly compensated employees can contribute even when the plan technically allows it. One useful feature: 401(k) balances are not swept into the IRA pro-rata calculation, so a mega backdoor Roth and a standard backdoor Roth can run side by side without interfering with each other.