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A backdoor Roth IRA is a two-step process that lets high-income earners contribute to a Roth IRA even when their income is above the Roth IRA contribution limits. You make a non-deductible traditional IRA contribution, then convert it to a Roth IRA. The “backdoor” is legal, IRS-approved, and widely used by high earners.
In 2026, you cannot contribute directly to a Roth IRA if your income exceeds $161,000 (single) or $240,000 (married filing jointly). The backdoor Roth removes this income limit by going through the traditional IRA first.
Roth IRA Income Limits in 2026
| Filing Status | Full Contribution | Phase-Out Range | No Contribution |
|---|---|---|---|
| Single / Head of Household | Under $146,000 | $146,000–$161,000 | Over $161,000 |
| Married Filing Jointly | Under $230,000 | $230,000–$240,000 | Over $240,000 |
| Married Filing Separately | None | $0–$10,000 | Over $10,000 |
If your income puts you above these limits, the direct path is closed. The backdoor Roth opens it back up.
How the Backdoor Roth IRA Works: Step by Step
- Open a traditional IRA. If you do not already have one, open a traditional IRA at Fidelity, Vanguard, Schwab, or any other major brokerage.
- Make a non-deductible contribution. Contribute up to $7,000 ($8,000 if you are 50 or older) for 2026. Because your income is above the deduction limit, this contribution is non-deductible — you do not get a tax break for it. This is fine. The money goes in after-tax.
- Wait briefly (optional). Some advisors recommend waiting a few days before converting to avoid any “step transaction” arguments. This is typically conservative and not strictly required.
- Convert to Roth. Contact your IRA custodian and convert the traditional IRA to a Roth IRA. You can do this online at most major brokerages in a few clicks. You owe tax on any gains that accrued between the contribution and the conversion — so the faster you convert, the less taxable gain there is.
- File Form 8606. Report the non-deductible contribution on IRS Form 8606 with your tax return. This is critical — it establishes your cost basis and prevents you from being taxed again on the same money when you withdraw.
The Pro-Rata Rule: The Main Complication
The backdoor Roth works cleanly only if you have no pre-tax money in any traditional IRA. If you do, the pro-rata rule applies — and it can create a significant tax bill.
The IRS treats all your traditional IRAs as one pool when you convert. It does not let you pick which “dollars” to convert. Instead, it applies a formula:
Taxable portion = (Pre-tax IRA balance / Total IRA balance) x Conversion amount
Example: You have $90,000 in a rollover IRA from a previous employer (pre-tax) and make a $10,000 non-deductible contribution to a traditional IRA. Total IRA balance: $100,000. 90% is pre-tax. When you convert $10,000, 90% ($9,000) is taxable. Only $1,000 converts tax-free.
To avoid the pro-rata rule, roll any pre-tax traditional IRA money into a current employer’s 401(k) or 403(b) before executing the backdoor Roth. Many employers accept incoming rollovers — check with your plan administrator.
Mega Backdoor Roth
The mega backdoor Roth is a related strategy for people whose employer 401(k) plan allows after-tax contributions (beyond the standard pre-tax/Roth limit).
In 2026, the total 401(k) contribution limit (employee + employer) is $70,000. Most people max out the employee contribution ($23,500 + catch-up) and receive employer match. If your plan allows after-tax contributions beyond that, you can contribute up to the $70,000 total limit.
You then convert those after-tax contributions to Roth — either within the 401(k) (if the plan allows in-plan Roth conversion) or by rolling them out to a Roth IRA.
This can let you put an additional $30,000–$40,000+ into Roth accounts in a single year. The mega backdoor Roth is powerful but available only with certain 401(k) plans.
Backdoor Roth vs. Traditional IRA
| Feature | Backdoor Roth | Non-Deductible Traditional IRA |
|---|---|---|
| Tax on contributions | After-tax (same) | After-tax (no deduction at high income) |
| Tax on growth | Tax-free | Taxed as ordinary income on withdrawal |
| Required minimum distributions | None during owner’s lifetime | Yes, starting at age 73 |
| Withdrawal flexibility | Contributions anytime, tax-free | Taxable on growth portion |
If you cannot deduct a traditional IRA contribution anyway (because you are covered by a workplace plan and over the income limit), a backdoor Roth is almost always better. You get Roth benefits — tax-free growth, no RMDs — instead of keeping money in an account that will be taxed as ordinary income on withdrawal.
When to Do the Backdoor Roth
The best time to execute the backdoor Roth is early in the year. This way:
- The money has more time to grow tax-free in the Roth
- Less accrued gain to worry about between contribution and conversion
- You have a full year for the converted funds to compound
Many financial advisors suggest doing it in January of each year as a routine.
Is the Backdoor Roth Legal?
Yes. The IRS and Congress have acknowledged the strategy. The original Build Back Better Act proposed eliminating backdoor Roth conversions (the “Rothification” proposal), but this did not pass. As of May 2026, backdoor Roth conversions remain legal and fully allowed.
Congress could change this in the future, so high earners who plan to use this strategy long-term should stay current on tax legislation.
For more on Roth strategies, see our guide on Roth conversions and our guide on retirement catch-up strategies for investors in their 40s.
FAQ
What is a backdoor Roth IRA?
A two-step workaround for high earners. You contribute to a traditional IRA on a non-deductible basis, then convert to a Roth. You end up with Roth money despite being above the income limit for direct contributions.
What is the Roth IRA income limit in 2026?
You cannot make a full direct contribution if you earn over $161,000 (single) or $240,000 (married filing jointly).
What is the pro-rata rule?
If you have any pre-tax money in a traditional IRA, the IRS treats all IRA balances as one pool. You cannot cherry-pick which dollars to convert. Part of every dollar converted is taxable based on the ratio of pre-tax to total IRA money.
Is it legal?
Yes. As of May 2026, backdoor Roth conversions are fully permitted by the IRS.
What is a mega backdoor Roth?
Using after-tax 401(k) contributions beyond the standard employee limit, then converting them to Roth. Available only at employers that allow after-tax 401(k) contributions and in-plan Roth conversions or rollovers.
Rates and limits as of May 2026. Tax laws can change. Consult a CPA or financial advisor before executing a backdoor Roth strategy.
Related: Solo 401(k): Complete Guide for the Self-Employed in 2026