Decision Guide · Reviewed 6 September 2026
High earners can bypass Roth income limits via non-deductible Traditional IRA contribution + conversion.
If you earn > $168K (single) or $252K (married filing jointly) in 2026, you can't contribute directly to a Roth IRA. But you can contribute to a Traditional IRA (non-deductible) and convert to Roth immediately, achieving the same goal. The trick is managing the pro-rata tax rule.
Who needs a backdoor Roth?
Roth IRA 2026 income limits (direct contribution):
- Single: phase-out $153K–$168K (can't contribute at $168K+)
- Married filing jointly: phase-out $242K–$252K (can't contribute at $252K+)
- Married filing separately: phase-out $0–$10K (basically unavailable)
If you exceed these limits, backdoor Roth is your only way to contribute to Roth IRA tax-free.
The backdoor Roth process (5 steps)
- Contribute $7,500 to Traditional IRA (2026 limit). Ask your broker "non-deductible contribution" to flag on Form 8606.
- Wait 1–2 days for settlement (not required but good practice).
- Convert entire balance (Traditional → Roth IRA) via broker form. No amount limit on conversions.
- Report conversion on Form 8606 (attached to tax return) with basis and converted amount.
- Accept taxes owed on any gains. Usually minimal if converted immediately, but can happen.
Example: Straightforward backdoor (no pro-rata issue)
You have $0 in any Traditional IRA accounts. You earn $200K (above Roth limit).
- Step 1: Contribute $7,500 non-deductible to Traditional IRA (basis $7,500, value $7,500).
- Step 2: Convert $7,500 Traditional → Roth IRA immediately.
- Step 3: File Form 8606 showing $7,500 basis, $7,500 converted, $0 taxable gain.
- Result: $7,500 now in Roth tax-free, permanent Roth growth with zero tax impact.
Pro-rata rule: The gotcha
If you own ANY Traditional IRA (including SEP IRA, SIMPLE IRA), the IRS pro-rates conversions.
Formula: Taxable conversion = (Total Traditional IRA balance − non-deductible basis) / Total Traditional IRA balance × Converted amount
Example: Pro-rata trap
- You have $92,500 in Traditional IRA (balance from old 401k rollover).
- You contribute $7,500 non-deductible to Traditional IRA (now $100K total).
- You try to convert $7,500 to Roth. IRS says: 92.5% of your Traditional IRA is pre-tax, so 92.5% of the conversion is taxable.
- Taxable conversion: $7,500 × 92.5% = $6,937.50 of ordinary income (at a 32% bracket, $2,220 of tax owed).
- The Roth gets $7,500, but you owe $2,220 of tax you expected to avoid.
How to avoid pro-rata trap
- Before executing backdoor: Roll any Traditional IRA balance into your 401k (if your plan allows, which most do).
- Result: Traditional IRA balance = $0. Pro-rata rule doesn't apply. Conversion is 100% non-taxable.
- Timing: Do rollover before year-end, then execute backdoor. File taxes cleanly next year.
Backdoor Roth annual checklist
- Check Traditional IRA balance (including old 401k rollovers). If > $0, consider rollover to 401k first.
- Contribute $7,500 to Traditional IRA (mark as non-deductible).
- Wait 1–2 days for settlement.
- Convert entire Traditional IRA balance to Roth.
- File Form 8606 with your tax return (crucial; forgetting this triggers phantom income tax).
- Keep records of contribution year and amount.
Tax-filing mistake: Forgetting Form 8606
If you convert but don't file Form 8606, the IRS assumes you converted pre-tax money (no basis). You owe tax on the entire conversion. Avoid this by filing Form 8606 even if you owe $0 tax.
Mega backdoor Roth (if available)
Some 401k plans allow "after-tax" contributions beyond the $24,500 employee limit. In 2026 the overall cap on everything going into the plan (your contributions, employer contributions and after-tax money) is $72,000, before catch-up contributions. With a $24,500 deferral and no employer money, that leaves room for up to $47,500 after-tax; employer contributions reduce that room. The plan must then let you convert the after-tax portion to Roth.
Not all plans allow this. Check with your plan administrator if interested.
Recommendation: Execute backdoor Roth annually if you earn above Roth limits. Tax-free growth compounds to hundreds of thousands over time.
Disclaimer: Backdoor Roth conversions have complex pro-rata and aggregation rules. Consult a tax professional (CPA/tax attorney) before executing, especially if you have existing Traditional IRAs. This is educational information, not tax advice.