Backdoor and Mega Backdoor Roth strategies offer powerful ways to boost tax-advantaged retirement savings for high earners. Here are the core points from the lesson:
A Backdoor Roth involves making a non-deductible IRA contribution and quickly converting it to a Roth IRA, but you must avoid having pre-tax IRA balances or you'll face tax via the pro-rata rule
Mega Backdoor Roths allow after-tax 401(k) contributions (beyond the regular limit) to be converted into Roth accounts, enabling up to ~$40K in additional Roth savings annually
The ideal Mega Backdoor setup includes in-plan Roth conversions, which are often automatable and avoid tax on earnings during the transition
Be cautious of contribution timing to avoid missing employer match benefits—either spread contributions evenly or ensure your plan supports a “true-up” feature