Is the Mega Backdoor Roth Calculator free?

Yes. The Mega Backdoor Roth Calculator on calculpage is completely free with no account required.

Yes. All calculations run entirely in your browser. Nothing you enter is transmitted to any server.

What category does the Mega Backdoor Roth Calculator belong to?

The Mega Backdoor Roth Calculator belongs to the Financial category on calculpage.

Financial

Estimate how much after-tax 401(k) money you can convert to Roth.

Annual Salary

Pre-Tax 401(k) Contribution

401(k) Total Combined Limit (2024: $69,000)

After-Tax Amount to Convert

After-Tax Room = $69,000 - Pre-Tax Contribution - Employer Match. Converted amount grows tax-free.

Mortgage

Loan

Auto Loan

Interest

Payment

Retirement

Does my plan need to allow this?▼

Yes. The mega backdoor Roth requires your 401(k) plan to allow after-tax contributions and in-service withdrawals or in-plan Roth conversions.

Are the converted funds immediately tax-free?▼

The after-tax contributions (basis) convert tax-free. Any earnings on those contributions before conversion are taxable at conversion.

What is the 2024 combined 401(k) limit?▼

The total limit across employee deferrals, employer contributions, and after-tax contributions is $69,000 ($76,500 with catch-up if age 50+).

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