Finance & Economics / Personal Finance

Mega Backdoor Roth Calculator

Annual Salary

Your Current Age

Age 50+ allows catch-up contributions ($7,500 extra)

Your Annual Traditional 401(k) Contribution

2024 limit: $23,000 ($30,500 if age 50+)

Employer Match (Annual)

Does Your 401(k) Allow After-Tax Contributions?

Check your plan documents or ask HR. Not all plans offer this.

Does Your Plan Allow In-Service Conversions to Roth?

This is critical - you must be able to convert while still employed

What is a Mega Backdoor Roth?

The Mega Backdoor Roth is a strategy that allows you to contribute up to $69,000 ($76,500 if 50+) to a Roth account in 2024, far exceeding the standard $7,000 Roth IRA limit.

How It Works:

Max out your traditional 401(k): $23,000 ($30,500 if 50+)
Get employer match (varies by company)
Make after-tax (non-Roth) contributions to fill remaining capacity
Immediately convert after-tax contributions to Roth 401(k) or Roth IRA

Requirements:

Your 401(k) plan must allow after-tax contributions (not all do)
Plan must allow in-service conversions or in-plan Roth conversions
You must have income high enough to max out contributions

Key Benefits:

Get tens of thousands into Roth accounts annually
No income limits (unlike regular Roth IRA contributions)
Tax-free growth and withdrawals in retirement
Can combine with regular backdoor Roth IRA ($7,000 more)

Important Notes:

Convert frequently to minimize taxable gains on earnings
Some plans auto-convert after-tax contributions
Track your after-tax basis for tax reporting
This is legal and IRS-approved (not a loophole)

Note: Only about 20-30% of 401(k) plans offer this option. Check with your HR or plan administrator.

Mega Backdoor Roth Calculator

What is a Mega Backdoor Roth?

See Also

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Compound Interest Calculator with Variable Contributions

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Investment Compound Growth Calculator (Dollar Cost Averaging)

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Roth IRA Conversion Tax Impact Calculator

Required Minimum Distribution (RMD) Calculator

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Pension Lump Sum vs Annuity Calculator

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Backdoor Roth IRA Calculator