Roth IRAs offer tax-free growth and tax-free qualified withdrawals, but direct contributions are limited to people below certain income levels. A backdoor Roth IRA is a legal two-step process that lets higher earners get money into a Roth anyway. The strategy is well established and has been used since income limits on Roth conversions were removed in 2010, but the details matter. A misstep with the pro-rata rule or the tax forms can turn a tax-free move into an unexpected bill.
Why the backdoor exists
Two rules create the opening:
- Roth contributions have income limits. If your modified adjusted gross income is above the phase-out range for your filing status, you cannot contribute directly to a Roth IRA. The IRS adjusts these ranges every year.
- Roth conversions do not. Since 2010, anyone can convert money from a traditional IRA to a Roth IRA regardless of income.
Anyone with earned income can make a nondeductible contribution to a traditional IRA. Converting that contribution to a Roth produces a Roth balance for people who could not contribute directly. Congress has discussed limiting the strategy in past proposals, but as of 2026 it remains permitted.
The contribution limit
For 2026, the IRA contribution limit is $7,500, with an additional catch-up contribution of $1,100 for people age 50 or older, for a total of $8,600. The limit applies to all your traditional and Roth IRAs combined. Your contribution also cannot exceed your taxable compensation for the year, though a working spouse can fund a spousal IRA for a non-working spouse.
How to do a backdoor Roth, step by step
Step 1: Check for existing pre-tax IRA balances
Before you begin, list every traditional, SEP, and SIMPLE IRA you own and their balances. This determines whether the pro-rata rule will create taxes, explained below.
Step 2: Make a nondeductible traditional IRA contribution
Open a traditional IRA, if you do not have one, and contribute up to the annual limit. Because your income is high, and especially if you are covered by a workplace plan, the contribution is not deductible. That makes it after-tax money, or “basis.”
Step 3: Convert to a Roth IRA
Ask your IRA custodian to convert the traditional IRA balance to a Roth IRA. Many people convert within days to minimize earnings. If the account earns interest or gains before conversion, those earnings are taxable when converted. Keeping the contribution in a money market or cash position until conversion limits that.
Step 4: Report it on your tax return
You file Form 8606 to report the nondeductible contribution and the conversion. Your custodian will send Form 1099-R showing the distribution from the traditional IRA and Form 5498 showing contributions. Many tax software programs handle this correctly only if you answer the IRA questions carefully.
The pro-rata rule
This is where most backdoor Roth mistakes happen. When you convert, the IRS does not let you choose to convert only after-tax dollars. Instead, it treats all your traditional, SEP, and SIMPLE IRA balances as one pot and applies a ratio.
How the calculation works
The taxable share of a conversion equals pre-tax IRA dollars divided by total IRA dollars, measured as of December 31 of the conversion year, plus amounts converted during the year.
Example
You contribute $7,500 nondeductible to a new traditional IRA and convert it. You also have a $92,500 rollover IRA from an old 401(k), all pre-tax. Your total IRA balance is $100,000, of which $7,500, or 7.5%, is after-tax. When you convert $7,500, only 7.5% is tax-free and 92.5%, or about $6,938, is taxable income.
Without the rollover IRA, the same conversion would be almost entirely tax-free.
Ways to avoid the pro-rata problem
- Roll pre-tax IRA money into a workplace plan. Many 401(k) and 403(b) plans accept roll-ins. Money in an employer plan is not counted in the pro-rata calculation. This must be done by December 31 of the conversion year.
- Convert everything. If the pre-tax balance is small, converting it all and paying the tax may be reasonable.
- Skip the strategy. If neither option works, the backdoor Roth may not make sense for you.
Note that inherited IRAs and Roth IRAs are not included in the calculation, and your spouse’s IRAs are not counted against yours.
The step transaction doctrine
Some people worry that the IRS might treat a contribution followed immediately by a conversion as a single prohibited direct Roth contribution. Congressional committee reports on the 2017 tax law acknowledged that converting nondeductible contributions is permitted, and the strategy is widely used. Still, keep clean records and do not commingle steps.
Timing and deadlines
- You can make an IRA contribution for a tax year until the tax-filing deadline the following April.
- A conversion is reported in the calendar year it occurs.
- Contributing for 2026 in early 2027 and converting immediately means the contribution belongs to 2026 while the conversion belongs to 2027. Form 8606 handles this, but it requires accurate entries in both years.
The five-year rules
Roth IRAs have two separate five-year clocks:
- For earnings: Earnings are tax-free only if your first Roth IRA has been open at least five years and you are 59½ or meet another exception.
- For conversions: Each conversion has its own five-year period for the 10% penalty on taxable converted amounts withdrawn before age 59½. With a clean backdoor Roth, little of the conversion is taxable, so this matters less, but it still affects people with pro-rata taxable amounts.
Is a backdoor Roth right for you?
It can make sense if:
- Your income exceeds the Roth limits.
- You have no, or easily movable, pre-tax IRA balances.
- You expect to keep the money invested for many years.
- You are already maximizing your workplace plan or want tax diversification in retirement.
It may not make sense if you have large pre-tax IRAs you cannot roll into a workplace plan, or if you need the money in the near term.
Related option: the mega backdoor Roth
Some 401(k) plans allow after-tax contributions above the normal employee limit, plus in-plan Roth conversions or in-service withdrawals. This “mega backdoor” can move much larger amounts into Roth accounts. It depends entirely on your plan’s features, so check your plan documents.
Record keeping that makes future years easier
Because a backdoor Roth often repeats every year, a simple recordkeeping system saves time and prevents errors. Keep a folder for each tax year with the confirmation of your nondeductible contribution, the conversion confirmation from your custodian, Form 1099-R, Form 5498, and a copy of the filed Form 8606. Line 14 of Form 8606 shows your remaining basis carried forward, which becomes important if you ever have leftover after-tax money in a traditional IRA.
Also note the date of each conversion, because each one starts its own five-year clock for the early-withdrawal penalty on any taxable portion. If you change custodians, download your account history before closing the old account. Statements can be hard to retrieve years later, and the IRS expects you to prove your basis if you claim that part of a distribution or conversion was already taxed. Many people also give a copy of these records to a spouse or tax preparer so the information survives a change in who manages the household finances.
Frequently Asked Questions
Is a backdoor Roth IRA legal?
Yes. It combines a nondeductible traditional IRA contribution with a Roth conversion, both permitted under current law. Income limits on conversions were removed in 2010.
What happens if I forget to file Form 8606?
Without Form 8606, the IRS may treat your conversion as fully taxable. You can file a late or amended Form 8606 to document your basis, and there is a $50 penalty for failure to file unless you show reasonable cause.
Does my 401(k) count toward the pro-rata rule?
No. Only traditional, SEP, and SIMPLE IRA balances count. Money in a 401(k), 403(b), or governmental 457(b) plan is excluded.
How long should I wait between contributing and converting?
There is no required waiting period. Many people convert within a few days to minimize taxable earnings, while some wait for a full statement cycle for record clarity.
Can I do a backdoor Roth every year?
Yes. As long as you have earned income and follow the rules, you can repeat the process annually.
This article is for general informational purposes only and is not legal, medical, tax, or financial advice. Rules vary by state and change over time; confirm details with the relevant agency or a licensed professional.
