Mega backdoor Roth capacity calculator

Compute how much you can move into Roth via the mega backdoor in your 401(k) — based on your salary, employer contributions, and the IRC 415(c) annual additions limit.

Annual salary

Employee 401(k) contribution

$23,000 (2024), or $30,500 if 50+.Employer match received

Employer profit-share / nonelective

Current age

Mega backdoor Roth capacity

Show the work

Total contributions so far$32,000
Annual additions limit$69,000
Limit as % of salary34.5%