Mega Backdoor Roth: How to Move Up to $47,500 Extra Into Roth
The standard backdoor Roth gives you $7,500/year in Roth access. The mega backdoor Roth is a different scale - $30,000-$50,000+ into Roth-advantaged space in a single year.
The Contribution Structure
The bottom line
The gap between employee + employer contributions and $72,000 is your potential after-tax contribution space.
How the Conversion Works
The Numbers on High Earner Impact
The bottom line
The complexity front-loads to setup. The payoff - decades of tax-free compounding - lasts far longer.
What would you do?
Priya earns $290,000. Her company's 401(k) allows after-tax contributions and in-plan Roth conversions. She maxes her traditional 401(k) at $24,500. Employer match: $8,700.
Your Move
Call your plan's HR department and ask two questions: (1) Does our 401(k) allow after-tax contributions beyond the employee deferral? (2) Does our plan allow in-plan Roth conversions or in-service distributions for after-tax amounts? If both yes, you have access to the mega backdoor.
Sources
- Internal Revenue Service, Notice 2025-67
2026 retirement plan limits (401(k), IRA, SIMPLE, catch-up)
Educational information only. Not financial, tax, or legal advice or a recommendation. Figures are drawn from the primary sources cited above; verify current amounts with the source before acting.
Educational content only. Not financial, tax, or legal advice. Consult a qualified professional before making decisions based on your specific circumstances.
Last reviewed: April 2026