Mega Backdoor Roth Calculator

Calculate exactly how much additional after-tax money you can shovel into your Mega Backdoor Roth strategy this year based on IRS Section 415(c) total limits.

Tax Year

Your Age

Your Primary Pre-Tax/Roth 401(k) Contribution

Employer Match & Profit Sharing

Your Maximum Strategy

$0
Mega Backdoor After-Tax Allowed

IRS Total Source Limit

Total Shoveled to Tax-Advantaged

The IRS limits the total combined dollars (yours + employer) that can enter your 401(k) plan. After-tax contributions let you legally push the rest of the limit into a Roth conversion.