The Roth IRA is one of the best accounts in the US tax code: you contribute after-tax dollars, the money grows tax-free, and you pay zero taxes on qualified withdrawals in retirement. The problem? If you earn too much, the IRS phases out your ability to contribute directly.

In 2026, single filers with modified adjusted gross income (MAGI) above $161,000 and married filers above $240,000 can't contribute to a Roth IRA at all. But there's a workaround that's been fully legal since 2010 and widely used ever since: the backdoor Roth IRA.

What Is the Backdoor Roth IRA?

The backdoor Roth IRA is a two-step process:

1. Make a non-deductible contribution to a traditional IRA
2. Convert that traditional IRA to a Roth IRA

Since there's no income limit on traditional IRA contributions (only on deductibility), and there's no income limit on Roth conversions, high earners can use this path to fund a Roth IRA regardless of their income. The strategy is legal, well-documented, and explicitly acknowledged by the IRS.

Who Needs the Backdoor Roth?

You need the backdoor Roth if:

• Your MAGI exceeds the Roth IRA phase-out range for your filing status
• You're already maxing your 401(k) and want additional tax-advantaged space
• You expect your tax rate in retirement to be equal to or higher than your current rate

If you're under the income limits, just contribute to a Roth IRA directly. The backdoor is only necessary when you've exceeded the threshold.

The Pro-Rata Rule: The Trap Most People Miss

Before you execute a backdoor Roth, you need to understand the pro-rata rule. This is where most people get caught.

If you have any pre-tax money sitting in traditional IRAs—from deductible contributions or old 401(k) rollovers—the IRS treats all your IRA money as one combined pool when you do a conversion. You can't cherry-pick and say “I'm only converting the non-deductible portion.”

Here's the math: If you have $94,000 in a traditional IRA from old rollovers, then contribute $6,000 in non-deductible funds and try to convert just the $6,000, the IRS considers only 6% ($6,000 ÷ $100,000) of that conversion to be non-deductible. The remaining 94% is taxable.

The clean backdoor Roth only works when you have no pre-tax money in any traditional IRA. If you have old rollover IRAs, consider rolling them into your current employer's 401(k)—if the plan allows incoming rollovers—to clear the pre-tax balance before executing the backdoor.

Step-by-Step: How to Do a Backdoor Roth IRA

Step 1: Open a Traditional IRA and Make a Non-Deductible Contribution

Contribute up to the annual IRA limit to a traditional IRA. In 2026, that's $7,000 ($8,000 if you're 50 or older). Since you're over the Roth income limit, this contribution is non-deductible—you don't get a tax break for it now. Keep this in mind for Step 4.

Step 2: Wait (Optional, But Recommended)

Some financial advisors recommend waiting a few weeks or months between the contribution and the conversion to avoid what's known as the “step transaction doctrine”—a legal principle where the IRS could collapse two steps that were clearly designed as one transaction. In practice, same-day conversions have been widely executed without issue. But if you want to be conservative, a brief waiting period doesn't hurt.

Step 3: Convert the Traditional IRA to a Roth IRA

Log into your brokerage account and execute a Roth conversion. Most major brokerages (Fidelity, Vanguard, Schwab) make this a simple online process. Convert the full balance. If the money has been sitting in a money market fund, there may be a tiny amount of earnings—those will be taxable, but the amount is usually negligible.

Step 4: Report the Conversion on Form 8606

This is the most important step people skip. You must file IRS Form 8606 with your tax return to report the non-deductible traditional IRA contribution and the conversion. This is how you prove to the IRS that you already paid tax on this money—so you don't pay tax on it again in retirement.

If you don't file Form 8606, the IRS has no record of the non-deductible basis and may try to tax your Roth distributions later. File it every year you do a backdoor Roth.

How Much Can You Put In?

The contribution limit for a backdoor Roth is the same as a regular IRA: $7,000 per year in 2026 ($8,000 if 50+). This is per person, so a married couple can do $14,000 combined, or $16,000 if both are 50+.

If you want to put more into a Roth, the Mega Backdoor Roth (available through some 401(k) plans) allows after-tax 401(k) contributions of up to $46,500 in 2026, which can then be converted to a Roth. Not all employers offer this, but it's worth checking your plan documents if you want maximum Roth exposure.

Backdoor Roth vs. Traditional Tax-Deferred Accounts

High earners often ask: if I'm in the 32% bracket now, should I still do a Roth? The answer depends on your expected tax rate in retirement.

If you expect significant taxable income in retirement (pensions, Social Security, required minimum distributions from large 401(k)s), Roth withdrawals become especially valuable—they don't count toward income for taxation of Social Security or Medicare means-testing. Roth accounts also have no required minimum distributions (RMDs), giving you more flexibility to manage taxable income late in life.

The conventional wisdom of “Roth is for low brackets, traditional is for high brackets” is a simplification. Tax diversification—having money in both pre-tax and post-tax accounts—is often the smarter long-term strategy.

Is the Backdoor Roth Still Legal?

Yes. As of 2026, the backdoor Roth IRA remains legal and unchanged. Congress has periodically discussed closing this loophole (it appeared in the Build Back Better Act in 2021, which ultimately didn't pass), but it remains intact. It's been used by millions of high earners for over 15 years without legal challenge.

That said, tax law can change. It's worth keeping an eye on any legislative proposals that could affect IRA rules. But if the strategy is legal today, use it. Don't avoid legal tax advantages out of fear of potential future changes.

The Bottom Line

The backdoor Roth IRA is a straightforward strategy that high earners should be executing every year. The steps take less than 30 minutes, the tax savings compound over decades, and the process is fully legal and IRS-recognized.

The only real trap is the pro-rata rule. Clear out pre-tax IRA balances before you start, file Form 8606 religiously, and you'll have tax-free money waiting for you in retirement—regardless of what your income looks like today.

Related reading: Roth IRA vs Traditional IRA: The Simple Breakdown | Retirement Planning Beyond Your 401(k) | The HSA Is Actually a Secret Investment Account