Mega Backdoor Roth Strategy Guide for High-Income 401(k) Users (2026)
Implement mega backdoor Roth strategy: after-tax 401(k) contribution, in-plan conversion, eligibility requirements, and high-income Roth strategy.
Summary
Mega backdoor Roth enables large Roth contributions for high earners. This guide explains after-tax contributions, conversion, and eligibility.
Key Steps
- 1Check plan availability: plan must allow after-tax contributions and in-plan Roth conversion.
- 2Contribute after-tax: 401(k) after-tax contributions up to combined $69,000 limit.
- 3Convert immediately: in-plan Roth conversion of after-tax balance, minimal growth taxed.
- 4Track conversion basis: after-tax portion converted tax-free, earnings taxed.
- 5Roll to Roth IRA: some plans allow Roth 401(k) rollover to Roth IRA.