Backdoor Roth IRA 2026: standard $7,000 and mega $43,500+
For single filers above $165K MAGI or married filing jointly above $246K, direct Roth contributions are off the table. The backdoor is a legal, IRS-acknowledged path that gets your money into Roth anyway. The mega backdoor multiplies the capacity through your 401(k).
Standard backdoor Roth: 5 steps
- 1
Open a Traditional IRA
If you do not already have one, open a Traditional IRA at any custodian (Vanguard, Fidelity, Schwab, E*TRADE all offer this). The account name and process are identical to a Roth IRA.
- 2
Contribute up to $7,000 non-deductible
Make a non-deductible contribution. Because you are above the income limit for the deduction, you would not get one anyway. Track it as non-deductible (this becomes your basis).
- 3
Convert to Roth immediately
Within a few days of the cash settling, convert the entire Traditional balance to your Roth IRA. Same custodian, internal transfer. Speed matters: any earnings before conversion are taxable.
- 4
File Form 8606 with your tax return
Report the non-deductible contribution and the conversion. Form 8606 establishes your $7,000 basis so the conversion is treated as a return of basis (zero tax) rather than a taxable distribution.
- 5
Repeat every year
The backdoor is an annual ritual. Each tax year, contribute $7,000 ($8,000 at 50+) non-deductibly and convert. Many custodians have a one-click backdoor flow.
Pro-rata rule: the trap that surprises high earners
The trap: the IRS treats all your Traditional, SEP, and SIMPLE IRA balances as one pool when calculating the taxable portion of any conversion. If you have a $92,500 pre-tax rollover IRA and you add $7,000 non-deductible plus convert that $7,000, only $562 of the conversion is tax-free. The other $6,438 is taxable.
Worked example
| Pre-tax Traditional IRA balance | $92,500 |
| Non-deductible contribution (basis) | $7,000 |
| Total IRA value | $99,500 |
| Pre-tax percentage | 92.96% |
| Convert $7,000 -> taxable portion | $6,508 |
| Convert $7,000 -> tax-free portion | $492 |
Workaround: roll the $92,500 pre-tax balance into a workplace 401(k) before converting. 401(k) balances are excluded from the pro-rata calculation, leaving you with only the $7,000 non-deductible basis, which converts tax-free.
Mega backdoor Roth through your 401(k)
If your employer's 401(k) plan allows after-tax contributions plus either in-plan Roth conversions or in-service withdrawals, you can move much more than $7,000 a year into Roth space. The 2026 total 401(k) limit is $70,000.
2026 mega backdoor capacity
| Total 401(k) limit (under 50) | $70,000 |
| Less: employee deferral max | ($23,500) |
| Less: typical employer match | ($5,000) |
| Mega backdoor headroom | ~$41,500 |
You contribute $41,500 after-tax to your 401(k), then immediately convert it to Roth (either in-plan or via in-service withdrawal to a Roth IRA). The IRS does not double-tax the basis. Headroom varies by plan and match generosity; check your plan documents.
Standard vs mega backdoor at a glance
| Attribute | Standard backdoor | Mega backdoor |
|---|---|---|
| 2026 capacity | $7,000 ($8,000 if 50+) | Up to ~$41,500 |
| Account used | Traditional IRA -> Roth IRA | After-tax 401(k) -> Roth 401(k) or Roth IRA |
| Eligibility | Anyone with earned income | Plan must allow after-tax + conversions |
| Pro-rata risk | Yes, across all your IRAs | No (401(k) is separate pool) |
| Tax form | Form 8606 | Form 1099-R; tracked by custodian |
Common mistakes
- Letting earnings pile up. Waiting months between contribution and conversion turns growth into taxable income. Convert within a week.
- Skipping Form 8606. Without it, the IRS has no record of your basis and could tax the conversion. File every year you contribute non-deductibly.
- Ignoring pro-rata. Doing the backdoor with a sizeable pre-tax IRA balance creates a tax bill. Roll the pre-tax balance into a 401(k) first.
- Mistaking it for tax avoidance. The backdoor lets you fund a Roth despite income limits. It does not avoid tax on pre-existing pre-tax balances.