A backdoor Roth conversion lets high earners get money into a Roth IRA even when their income is too high to contribute directly. It works by contributing to a non-deductible traditional IRA, then converting that money to a Roth. Before we ever recommend one, John Shedenhelm’s team checks a single number first: your total pre-tax IRA balance.
What Is a Backdoor Roth Conversion?
A backdoor Roth conversion is a two-step move. First, you put after-tax money into a traditional IRA. Second, you convert that IRA to a Roth IRA. Because the contribution was already taxed, the conversion itself should trigger little or no extra tax, as long as you don’t have other pre-tax IRA money mixed in.
Why High Earners Need the Backdoor Route
You can’t contribute directly to a Roth IRA once your income crosses a certain line.
For 2026, the IRS phases out direct Roth IRA contributions between $242,000 and $252,000 of modified adjusted gross income (MAGI) for married couples filing jointly, and between $153,000 and $168,000 for single filers. Above the top of that range, a direct contribution isn’t allowed at all.
There’s no income limit on Roth conversions, though. That gap is what makes the backdoor route work. You contribute to a traditional IRA (anyone can, regardless of income), then convert it. Nothing in the tax code stops you from doing both in the same week.
Did You Know? The backdoor Roth strategy isn’t a loophole Congress overlooked. The Joint Committee on Taxation has flagged it in past legislative proposals, but as of 2026 it remains fully legal and unchanged in the tax code.
The Pro-Rata Rule: The Trap That Ruins Backdoor Roths
Here’s the number we check before we ever say yes to a backdoor Roth: your combined balance across every traditional, SEP, and SIMPLE IRA you own, as of December 31 of the conversion year.
The IRS doesn’t let you cherry-pick which dollars you convert. If you have other pre-tax IRA money anywhere, the conversion is taxed on a pro-rata basis, blending your new after-tax contribution with all your existing pre-tax balances. A $7,500 non-deductible contribution sitting next to a $150,000 rollover IRA from an old 401(k) means the conversion is mostly taxable, not tax-free.
Pro Tip: If you have an old 401(k) or SEP IRA sitting around, moving it into your current employer’s 401(k) plan (if the plan accepts rollovers) before you convert can clear the pro-rata problem entirely, since employer plan balances aren’t counted in the IRA aggregation rule.
We ask three follow-up questions once that number is in hand:
- Do you have any other traditional, SEP, or SIMPLE IRA balances anywhere, at any custodian?
- Can any of those balances be rolled into a current employer 401(k) before year-end?
- What is your marginal tax bracket this year, since that determines the true cost if a rollover isn’t possible?
Step-by-Step: How to Do a Backdoor Roth Conversion
- Confirm your income exceeds the direct Roth IRA contribution limit for 2026.
- Check your total pre-tax IRA balance across every account you own.
- If possible, roll pre-tax IRA balances into an employer 401(k) that accepts incoming rollovers.
- Contribute up to $7,500 (or $8,600 if you’re 50 or older) to a traditional IRA, non-deductible.
- File IRS Form 8606 to report the non-deductible contribution.
- Convert the traditional IRA to a Roth IRA, ideally within days, to avoid taxable growth before conversion.
- Report the conversion on your tax return using Form 8606 again.
Mega Backdoor Roth: The After-Tax 401(k) Version
A mega backdoor Roth is a different tool that solves a similar problem at a much larger scale. Instead of using an IRA, it uses after-tax contributions inside a 401(k) plan, if your plan allows them.
For 2026, the total amount that can go into a 401(k) from all sources, employee deferrals, employer match, and after-tax contributions combined, is $72,000 (or higher with catch-up contributions for those 50 and up). If your plan permits after-tax contributions and in-plan Roth conversions or in-service withdrawals, you can potentially move tens of thousands more into Roth status every year than a backdoor IRA conversion alone allows.
Not every 401(k) plan supports this. It has to be written into the plan document, and not all employers include it.
When a Backdoor Roth Doesn’t Make Sense
A backdoor Roth isn’t right for everyone. It usually doesn’t make sense if:
- You already have a large pre-tax IRA balance you can’t roll into a 401(k), making the pro-rata tax cost too high.
- You expect your tax bracket to drop a lot in retirement, which reduces the long-term payoff of paying tax now.
- You need the contributed money within the next five years, since Roth conversions carry their own five-year clock for penalty-free withdrawals of converted amounts before age 59½.
Did You Know? The five-year clock on a Roth conversion is separate from the five-year clock on your very first Roth contribution. Each conversion starts its own five-year timer for early-withdrawal purposes.
A backdoor Roth conversion is one piece of a bigger tax-bucket strategy, one that works best when it’s coordinated with your other accounts rather than done in isolation. That’s the same coordination John Shedenhelm uses when building a tax-efficient withdrawal order for clients years before retirement. It’s why the pro-rata check comes before any recommendation, not after, and why we ask about every IRA account you own, even ones you may have forgotten from an old job.
If you’ve already worked through the mechanics of a Roth conversion ladder for retirement income, a backdoor Roth solves a different, earlier-career problem: getting money into Roth status in the first place, while you’re still earning too much to contribute directly.
High earners weighing this move should also loop in a CPA, since the interaction between pro-rata rules, state taxes, and other income can get complicated fast. The advisors at Eagle Financial Solutions coordinate that review as part of a full tax-bucket plan, not a one-time transaction.
Getting locked out of direct Roth contributions doesn’t mean you’re locked out of a Roth account. It just means the path in has one more step, and one number worth checking before you take it. Schedule a conversation with Eagle Financial Solutions to see whether a backdoor Roth fits your specific mix of accounts.
FAQ
Is a backdoor Roth conversion legal in 2026? Yes. The backdoor Roth has been used for years and remains fully legal under current tax law as of 2026. It combines two allowed moves: a non-deductible IRA contribution and a Roth conversion, both explicitly permitted by the IRS.
What is the pro-rata rule for backdoor Roth conversions? The pro-rata rule taxes a Roth conversion based on the ratio of pre-tax to after-tax money across all your traditional, SEP, and SIMPLE IRAs combined. You can’t convert only the after-tax portion if pre-tax balances exist elsewhere.
How much can I contribute to a backdoor Roth in 2026? You can contribute up to $7,500 to a traditional IRA in 2026, or $8,600 if you’re 50 or older, before converting it. This is the same limit that applies to regular IRA contributions.
What’s the difference between a backdoor Roth and a mega backdoor Roth? A backdoor Roth uses a traditional IRA and is capped at the annual IRA contribution limit. A mega backdoor Roth uses after-tax 401(k) contributions and can move far more money into Roth status, but only if your employer’s plan allows it.
