Backdoor Roth IRA Calculator
Calculate taxes and verify IRS Pro-Rata Rule compliance for high-income Backdoor and Mega-Backdoor Roth IRA conversions.
Zero pre-tax IRA balances detected. Your entire $7,000 conversion will transfer to your Roth IRA with $0 federal or state tax liability.
IRS Form 8606 Inputs
Executing Tax-Compliant Backdoor Roth IRA Conversions
For high-earning individuals exceeding IRS Modified Adjusted Gross Income (MAGI) phase-out thresholds, the Backdoor Roth IRA is a premier wealth-building vehicle. However, the IRS Pro-Rata Rule under IRC Section 408(d)(2) aggregates all non-Roth IRAs (Traditional, SEP, and SIMPLE IRAs). If you hold pre-tax balances anywhere in the IRA ecosystem on December 31st of the conversion year, your conversion triggers unexpected, irreversible taxable income.
Institutional-Grade Features
IRS Pro-Rata Rule Math
Aggregates total pre-tax vs. post-tax non-deductible basis across all Traditional, SEP, and SIMPLE IRAs.
IRS Form 8606 Simulation
Simulates exact lines from IRS Form 8606 to compute taxable vs. non-taxable conversion amounts.
Federal & State Marginal Tax Estimate
Calculates the exact federal and state income tax liabilities triggered by the conversion.
Reverse Rollover Strategy
Detects opportunities to perform an employer 401(k) reverse rollover to eliminate pro-rata taxes entirely.
Long-Term Tax-Free Compounding
Projects future tax-free growth over 10, 20, and 30 years compared to taxable brokerage holding.
One-Click PDF/Print Summary
Export the tax analysis directly for your CPA before filing your annual tax return.
Strategic Wealth Scenarios
- ✓High-Income Tech & Finance Professionals
Circumvent single ($161k+) and married ($240k+) direct Roth contribution limits lawfully.
- ✓Physicians & Medical Specialists
Maximize after-tax retirement savings capacity alongside maxed employer 401(k) / 403(b) accounts.
- ✓SEP IRA & Small Business Owners
Identify pre-tax SEP IRA balances that would inadvertently trigger pro-rata taxation.
- ✓Mega-Backdoor 401(k) Planners
Evaluate after-tax 401(k) conversions to in-plan Roth or Roth IRA up to IRS Section 415(c) limits.
Frequently Asked Questions
What is the IRS Pro-Rata Rule for Backdoor Roth IRAs?
The IRS looks at all of an individual's Traditional, SEP, and SIMPLE IRAs combined as of December 31 of the year you do the conversion. You cannot choose to convert only your non-deductible after-tax contributions. If 80% of your total IRA assets are pre-tax and 20% are after-tax, 80% of any conversion will be taxable.
How can I avoid the Pro-Rata Rule completely?
The most effective method is to roll over your existing pre-tax Traditional, SEP, or SIMPLE IRA balances into your current employer's 401(k) or 403(b) before December 31st of the conversion year. Employer-sponsored qualified retirement plans are not counted under the IRA pro-rata aggregation rule.
What tax form must I file for a Backdoor Roth IRA?
You must file IRS Form 8606 (Nondeductible IRAs) with your federal tax return (Form 1040) for any year you make non-deductible contributions or perform Roth conversions.
Is there a waiting period between contributing and converting?
There is no statutory waiting period required by the IRS. Following the 2017 Tax Cuts and Jobs Act congressional committee report reaffirming the legality of backdoor conversions, most investors convert as soon as the funds clear to minimize taxable market gains.
More Financial Calculators
Need a Brain Break? ☕
Done working on your task? Take a quick 60-second break, test your reflexes, and flap through infinite pixel obstacles in Sky Flap!