Summary: If you make too much money to contribute directly to a Roth IRA, you’ve probably heard someone say, “Just do a backdoor Roth.” Sounds simple, right? Not so fast.

In this episode of The Retirement Cheat Code, JD White breaks down how the backdoor Roth IRA actually works — and the one rule that quietly blows up the strategy for a lot of high earners.

You should watch these related videos if you’re not sure about these terms before diving into this one:

What is a Traditional IRA?

Roth IRA Explained: The Retirement Account Everyone Should Have

Tax Buckets – How EVERYTHING Gets Taxed

Backdoor Roth IRA Explained (Without the IRS Surprise)

Hi everyone, JD White here. Today we’re talking about one of those strategies that gets thrown around in the financial world like it’s easy: the backdoor Roth IRA.

Yes, it’s a powerful tool.
No, it’s not as simple as people make it sound.

There are rules. And if you don’t understand them, you can accidentally create a tax bill you weren’t expecting.

Let’s walk through it calmly and clearly.

What Is a Backdoor Roth IRA?

At its core, the backdoor Roth IRA is a two-step move:

1. Contribute to a traditional IRA (as a non-deductible contribution).
2. Convert that money to a Roth IRA.

Why would you do this?

Because high earners are often phased out of making direct Roth IRA contributions. But there are no income limits on:

• Making a non-deductible traditional IRA contribution (as long as you have earned income)
• Doing a Roth conversion

So we use the traditional IRA as the “side door” into the Roth. Hence, backdoor.

Step One: Non-Deductible Traditional IRA Contribution

First rule: you must have earned income.

No earned income, no IRA contribution. Period.

For 2025:

• $7,000 if you’re under age 50
• $8,000 if you’re 50 or older

You contribute to a traditional IRA, but you do not deduct it on your tax return. That’s why it’s called a non-deductible contribution.

You’ve already paid taxes on that money. It goes in after-tax.

Step Two: Convert to Roth IRA

Now we convert that traditional IRA contribution to a Roth IRA.

Since you already paid taxes on the contribution, there’s no tax due on the amount you just put in — assuming everything is structured correctly.

That’s the magic of the backdoor.

But here’s where things get tricky.

The Rule That Trips People Up: The Pro Rata Rule

If you already have money sitting in a traditional IRA, things change.

Let’s say:

• You already have $100,000 in a traditional IRA (pre-tax money).
• You add $8,000 as a non-deductible contribution.
• Now the total IRA balance is $108,000.

You convert $8,000 thinking, “Great, that’s my backdoor Roth.”

Not so fast.

The IRS requires conversions to be done pro rata — meaning proportionally across all traditional IRA money.

In this example:

• Only about 7–8% of your IRA is after-tax money.
• The other 92–93% is pre-tax.

So when you convert $8,000:

• Most of it will be treated as taxable income.
• You’ll owe federal (and possibly state) taxes on that portion.

At that point, it’s not really a backdoor Roth. It’s just a taxable Roth conversion.

That’s why this strategy generally only works cleanly if you have no existing traditional IRA balances.

And when I say “no balance,” I mean none. Not even sitting in an old rollover IRA from a previous 401(k).

How Some People Fix This

If you do have a traditional IRA balance, there is sometimes a workaround.

For example, I personally consolidated my traditional IRA into my current 401(k). Once that traditional IRA balance was gone, I was able to do a clean backdoor Roth the following year.

So the sequence looked like this:

Year 1:

• Consolidate traditional IRA into 401(k)

Year 2:

• Make non-deductible IRA contribution
• Convert to Roth

Clean slate. No pro rata problem.

Not every 401(k) allows this. You have to check the plan rules. But it’s worth exploring if you’re serious about using this strategy long term.

When the Backdoor Roth Makes Sense

This strategy works best when:

• You’re over the Roth income limits
• You have earned income
• You have no existing traditional IRA balances
• You want long-term tax-free growth

If you already have large traditional IRA balances, the math often doesn’t work — and you’re just layering complexity onto a simple Roth conversion.

The Two Big Rules to Remember

If you take nothing else from this:

1. You must have earned income to contribute.
2. You cannot have existing traditional IRA balances if you want to avoid the pro rata tax issue.

Miss either of those, and the backdoor can turn into a front-facing tax bill.

Final Thoughts

The backdoor Roth IRA is a powerful strategy — but it lives in the details. This is not something to do casually because someone on the internet said, “It’s easy.”

It can be easy.

But only if you understand the rules first.

If you enjoyed this one — and I know we got a little into the weeds — click the thumbs up button. If you’re new here, subscribe. And as always, thank you for watching. We’ll catch you on the next one.