Roughly 70% of American workers now have access to a workplace retirement plan, and that number keeps climbing.
Sounds great—until you realize those same workers often earn too much to contribute to a Roth IRA directly.
For 2024, the income phase-out starts at $146,000 for single filers and $230,000 for married couples filing jointly.
Cross that line, and the door slams shut, at least on paper.
Financial planners call it the "backdoor Roth IRA," and it's been legal since 2010.
You contribute to a traditional IRA, which has no income limits, then convert that money to a Roth.
You pay taxes on any gains or pre-tax dollars converted, but after that, the money grows tax-free and comes out tax-free in retirement.
No income caps, no contribution limits tied to your salary.
The IRS has a rule called the pro-rata calculation.
If you hold any pre-tax money in a traditional IRA—from an old 401(k) rollover, say—you can't just convert the new after-tax dollars.
The IRS treats all your traditional IRA money as one big pool.
So if you have $50,000 in pre-tax IRA funds and add $7,000 after-tax, converting that $7,000 means roughly 88% of it is taxable.
That's a nasty surprise for people who didn't plan ahead.
If you have a 401(k) at work, roll your pre-tax IRA money into it before doing the backdoor conversion.
Most employers allow this, and it clears the deck.
Then your traditional IRA holds only after-tax dollars, and the conversion becomes nearly tax-free.
The catch: not every 401(k) plan accepts rollovers, and the paperwork can take weeks.
Miss the timing, and you're stuck with a tax bill.
There's also the step transaction doctrine, a fuzzy IRS rule that could theoretically challenge backdoor Roths if they look like a single coordinated move.
So far, the IRS hasn't targeted small investors, and Congress hasn't closed the loophole despite repeated proposals.
In 2021, the Build Back Better Act nearly eliminated backdoor Roths for high earners before it died in the Senate.
Similar proposals resurface every few years.
For now, the strategy remains a legitimate tool for high earners who max out their 401(k) and still want more tax-free growth.
The annual contribution limit for 2024 is $7,000, or $8,000 if you're 50 or older.
That's not life-changing money on its own, but over 20 years, it adds up.
A $7,000 annual contribution growing at 7% could surpass $300,000, all tax-free.
The bottom line: the backdoor Roth IRA isn't a loophole for the ultra-wealthy.
It's a workaround for upper-middle-class savers who got locked out of a popular retirement account.
If your income is creeping toward the phase-out, talk to a tax professional before December 31.
The rules are unforgiving, and the IRS doesn't offer do-overs. **Our take:** The backdoor Roth is a rare example of legal tax planning that actually works for ordinary high earners, not just billionaires.
Final Thoughts
The pro-rata rule and shifting political winds mean you need to review it every year, not once a decade.