Backdoor Roth IRA: Step-by-Step for 2026

1. Our verdict on the backdoor Roth IRA

Quick Answer: Do it if your pre-tax IRA balance is zero. The conversion then costs nothing in tax and puts $7,500 into a Roth for 2026. If you are carrying a rollover IRA, the pro-rata rule can make 87% of that same conversion taxable. Clear the balance first, or skip the move.

Most guides to this move spend their time on the clicks: open an account, fund it, press convert. The clicks are the easy part.

What separates a free $7,500 Roth contribution from a surprise four-figure tax bill is one number you have probably never looked at: the combined balance of every traditional, SEP and SIMPLE IRA in your name.

This guide runs it the way we run every comparison at DollarVisor: the rule first, then the arithmetic, then what it costs in ten states. Every figure traces to the IRS or a named public source, the standard behind our investing guides.

If you want to watch the steps before you read them, this walkthrough covers the 2026 version.

2. What is a backdoor Roth IRA?

Quick Answer: A backdoor Roth is not a special account. It is two ordinary transactions done back to back: a nondeductible contribution into a traditional IRA, then a conversion of that money into a Roth IRA. Income limits apply to Roth contributions. They do not apply to conversions.

The rule it works around is narrow. The IRS caps who may put money into a Roth by income, but removed the cap on conversions in 2010 and never put one back. So a high earner takes the long way round, on three published rules:

• Anyone with earned income can fund a traditional IRA. There is no ceiling on contributing, only on deducting, which a high earner with a workplace plan blows past anyway.
• A nondeductible contribution creates basis. Money you already paid tax on is tracked as basis on IRS Form 8606, and basis is not taxed again when it moves.
• Conversions have no income limit. Per IRS Publication 590-A, any traditional IRA holder can convert to a Roth at any income level.

Line those three up and after-tax money lands in a Roth without a Roth contribution ever being made. Still deciding whether a Roth is the right target? Start with the Roth versus traditional IRA comparison.

3. Who is locked out of a Roth in 2026?

Quick Answer: For 2026, direct Roth IRA contributions phase out between $153,000 and $168,000 of modified adjusted gross income for single filers, and between $242,000 and $252,000 for married couples filing jointly. Above the top of your range, the back door is the only way in.

Read the last two rows against the Roth rows. A single filer with a 401(k) loses the traditional IRA deduction at $91,000 but keeps Roth access until $168,000. Between those numbers the back door is pointless: contribute to the Roth directly.

Above $168,000 single or $252,000 joint the door is shut. If your employer plan allows after-tax contributions, check the much larger version of this move before settling for $7,500.

4. The five steps, start to finish

Quick Answer: Check your pre-tax IRA balance, contribute up to $7,500 to a traditional IRA without claiming a deduction, leave it in cash, convert the full amount to your Roth IRA, then file Form 8606 with your tax return. Steps one and five are the ones people skip.

How to do a backdoor Roth IRA in 2026

The sequence assumes both accounts sit at the same brokerage, which keeps the conversion an internal transfer rather than a check in the mail.

1. Check every pre-tax IRA you own. Add up all traditional, SEP and SIMPLE IRA balances. If that total is anything other than zero, read section 5 before you contribute a dollar.
2. Open a traditional IRA if you do not have one. The account is a pass-through you will empty within days. Our brokerage account comparison covers which providers charge nothing for the round trip.
3. Contribute up to $7,500 and do not deduct it. That is $8,600 if you turn 50 or older during 2026. This is a lump sum into a holding account, so the usual case for spreading contributions out over time belongs to the investing you do inside the Roth afterwards.
4. Convert the whole balance to your Roth IRA. Leave the cash uninvested until the conversion clears. Anything it earns in the traditional IRA becomes taxable income when it moves.
5. File Form 8606 with that year’s return. Part I records the nondeductible contribution and your basis. Part II records the conversion. Skip it and the IRS has no record that you already paid tax on the money.

Timing between steps three and four worries people, but Publication 590-A sets no waiting period.

5. The pro-rata rule, with the math

Quick Answer: The IRS treats all your traditional, SEP and SIMPLE IRAs as one pot on December 31. Your conversion is taxed in proportion to how much of that pot is pre-tax money. With $50,000 of pre-tax IRA money, 87% of a $7,500 conversion is taxable, not zero.

The formula is plain: divide the pre-tax balance across all your traditional IRAs by that balance plus your new after-tax contribution, and that fraction of the conversion is taxable. The IRS works a version of this in its own briefing on conversions, where a taxpayer moving $10,000 of after-tax money is taxed on 75% of it.

Notice how fast the curve flattens. From $50,000 upward the outcome barely moves: it is close to fully taxable either way. There is no balance small enough to ignore.

One old rollover IRA turns a tax-free contribution into a taxable one. The size of the rollover barely matters.

6. What that tax bill costs in your state

Quick Answer: Take the $50,000 case above, where $6,522 of the conversion is taxable. Federal tax at 24% is $1,565 everywhere. State tax ranges from $0 in Texas, Florida, Illinois and Pennsylvania to $607 in California: a spread of just over 39% on the same transaction.

Illinois and Pennsylvania are the rows worth pausing on. Neither is a no-income-tax state, yet both land at zero. Illinois subtracts federally taxed retirement income from its base, and Pennsylvania treats a trustee-to-trustee IRA conversion as non-taxable. A handful of other states, including Mississippi, treat it the same way, so confirm your own before you assume the worst.

A Californian and a Pennsylvanian doing the identical transaction pay $607 apart: money that would otherwise compound inside the Roth for decades. Rates here are marginal rates for a working filer in their forties, so age-based exclusions in New York and Georgia are not applied.

7. How to clear a pre-tax IRA balance first

Quick Answer: Roll the pre-tax IRA money into your current employer’s 401(k) before December 31. Employer plan balances are invisible to the pro-rata calculation, so once the IRA reads zero, your conversion goes back to being tax-free.

This fix rarely gets mentioned until after the tax bill lands. It works because pro-rata only looks at IRAs: a 401(k), 403(b) or 457 balance sits outside the formula. Confirm all of this before you move a dollar:

• Your plan accepts roll-ins. Not all do. Ask the administrator for the incoming rollover form; if the answer is no, the strategy stops here.
• The plan’s fees clear the break-even. You are parking the balance permanently to save tax once. On $50,000 moved to save roughly $1,565, a plan charging 0.40% more than your IRA costs $200 a year: the saving is gone inside eight years. Price it against what your 401(k) actually charges.
• You have a plan at all. If you are self-employed, a solo 401(k) opened before December 31 works the same way and gives you control over the fund menu.
• The transfer completes before December 31. The balance is measured at year end. A rollover that settles on January 3 does nothing for the year you converted in.

If your plan refuses roll-ins and the balance is large, skip the back door and use a taxable brokerage account. A $6,522 taxable event to shelter $7,500 rarely pays back inside a normal retirement timeline.

8. How common is the pre-tax IRA problem?

Quick Answer: Common enough that it should be your first check, not your last. About a third of US households own a traditional IRA, and in mid-2024 some 59% of those households held employer-plan rollover money inside it: exactly the balance that triggers pro-rata.

Read the last three rows as one story. Most traditional IRAs are not side accounts built from annual contributions. They are old workplace plans that followed someone out the door, usually in full.

That is why this strategy fails so often in practice. The high earner changing jobs every few years is exactly the person carrying a rollover IRA without thinking of it as one.

9. Five mistakes that create a tax bill

Quick Answer: The expensive errors are investing the money before converting, forgetting that SEP and SIMPLE IRAs count, skipping Form 8606, rolling a 401(k) into an IRA in the same calendar year, and assuming the five-year clock does not apply to you.

• Investing before the conversion. Any growth in the traditional IRA is taxable when it converts. Leave the cash alone, then invest inside the Roth.
• Forgetting SEP and SIMPLE IRAs. Freelancers often carry one and do not count it. The formula counts every traditional, SEP and SIMPLE IRA you own, and ignores your spouse’s.
• Not filing Form 8606. Without it there is no record of your basis, and the same dollars can be taxed twice.
• Rolling a 401(k) out in the same year. Moving a plan into an IRA in December undoes a clean conversion done in March, because the balance is measured on December 31.
• Ignoring the five-year rule on converted money. Per IRS Publication 590-B, withdrawing a converted amount within five years can trigger the 10% early-distribution tax even when no income tax is due.

None are edge cases, and four of the five come down to timing: the one part of this entirely under your control.

10. So should you do it?

Quick Answer: Yes if your pre-tax IRA balance is zero or your employer plan will absorb it before year end. No if you are carrying rollover money you cannot move, because you would be paying real tax now to shelter $7,500 later.

Three profiles cover most readers.

1. No traditional IRA at all. Do it every year, as early as you can. The conversion is tax-free and the Roth gets the longest runway.
2. A rollover IRA and a plan that accepts roll-ins. Move the balance first, convert second, and leave a buffer before December 31.
3. A rollover IRA and no way to move it. Skip the back door. A taxable brokerage account holding index funds costs nothing today and little in tax drag.

Our numbers are recalculated whenever the IRS updates its limits. Read how we build these comparisons before you rely on them. No company pays for placement in anything we publish.

11. Frequently Asked Questions

1. Is a backdoor Roth IRA legal in 2026?

Yes. The strategy uses two transactions the IRS publishes rules for: a nondeductible traditional IRA contribution, reported on Form 8606, and a conversion to a Roth, which has had no income limit since 2010. Congress has considered closing it and has not done so, so it remains available for the 2026 tax year.

2. How much can I put through a backdoor Roth IRA in 2026?

Up to $7,500, the 2026 IRA contribution limit set in IRS Notice 2025-67. If you are 50 or older at any point in 2026 you can add the $1,100 catch-up, for $8,600 total. The limit covers all your IRAs combined, so a contribution elsewhere reduces what you can send through the back door.

3. Do I have to wait between the contribution and the conversion?

No published rule sets a waiting period, and IRS Publication 590-A does not name one. Many people convert within a few days, once the contribution settles. Keeping the money in cash during the gap matters more than the gap itself, because any earnings are taxable when they move.

4. What happens if I already have a rollover IRA?

The pro-rata rule applies and most of your conversion becomes taxable. With $50,000 of pre-tax IRA money, 87% of a $7,500 conversion is taxable income. The usual fix is to roll that balance into your current employer’s 401(k) before December 31, since workplace plans are excluded from the calculation.

5. Do I owe state tax on a backdoor Roth?

Only if part of your conversion is taxable, and then it depends on where you live. Texas and Florida have no income tax. Illinois subtracts federally taxed retirement income from its base, and Pennsylvania does not tax a direct trustee-to-trustee conversion. California taxes it at up to 9.3%.

This article is information, not financial or tax advice. Limits and state rules change; confirm current figures with the IRS and your state tax authority, or a qualified tax professional, before you act. See our full disclaimer.