Roth IRA Conversion Calculator

Analyze whether converting from a Traditional IRA to a Roth IRA makes financial sense. Compare after-tax retirement values under different tax rate scenarios.

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Enter your IRA details and tax rates to compare Traditional vs Roth conversion outcomes.

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Pro Tip

Consider converting in years with lower income, such as between jobs, early retirement, or before Social Security starts. Multiple small conversions can be more tax-efficient than one large conversion.

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Roth Conversion Strategy

A Roth IRA conversion is a powerful tax planning tool that involves moving funds from a Traditional IRA (or other pre-tax retirement account) to a Roth IRA. The converted amount is taxed as ordinary income in the year of conversion, but all future growth and qualified withdrawals are completely tax-free.

The fundamental question in a Roth conversion decision is whether it is better to pay taxes now at your current rate or later at your retirement rate. If you expect your tax rate to be higher in retirement (due to income growth, higher tax brackets, or legislative changes), converting now locks in the lower rate.

Time is a critical factor. The longer the converted funds have to grow tax-free, the greater the benefit. A conversion at age 40 with 25 years of growth has a much larger potential benefit than a conversion at age 60 with only 5 years of growth, all else being equal.

Roth conversions also eliminate Required Minimum Distributions (RMDs). Traditional IRAs require withdrawals starting at age 73, potentially pushing you into higher tax brackets. Roth IRAs have no RMDs during the original owner's lifetime, offering more flexibility in retirement income planning.

Roth Conversion Formulas

After-Tax Value Comparison

Traditional After-Tax = FV × (1 - Retirement Tax Rate)
Roth After-Tax = FV (tax-free)

Where:

FV = Future Value = Conversion Amount x (1 + return)^years

Tax Cost Now = Conversion Amount x Current Tax Rate

Net Benefit = Roth After-Tax - Traditional After-Tax - Tax Cost Now

Example

Convert $50,000 at 24% tax rate, 7% return, 20 years, 22% retirement rate:

  • • Tax cost now: $50,000 x 24% = $12,000
  • • Future value (both): $50,000 x (1.07)^20 = $193,484
  • • Traditional after-tax: $193,484 x (1 - 22%) = $150,918
  • • Roth after-tax: $193,484 (fully tax-free)
  • • Net benefit: $193,484 - $150,918 - $12,000 = $30,566 in favor of Roth

Frequently Asked Questions

What is a Roth IRA conversion?
A Roth conversion involves moving money from a Traditional IRA (pre-tax) to a Roth IRA (after-tax). You pay income tax on the converted amount now, but all future growth and qualified withdrawals are tax-free. This can be beneficial if you expect to be in a higher tax bracket in retirement.
When does a Roth conversion make sense?
Conversions are most beneficial when your current tax rate is lower than your expected retirement tax rate, you have a long time horizon for tax-free growth, you can pay the conversion tax from non-retirement funds, or you want to reduce future Required Minimum Distributions.
Do I have to convert the entire balance?
No, you can convert any amount. Partial conversions allow you to manage the tax impact by spreading conversions over multiple years. This strategy, called a Roth conversion ladder, can keep you in a lower tax bracket each year while gradually converting your Traditional IRA.
Should I pay conversion taxes from the IRA or outside funds?
Paying taxes from outside funds (non-retirement savings) is strongly recommended. If you pay from the IRA itself, that portion is both taxed as income AND loses years of tax-free growth. Using outside funds preserves the full converted amount for tax-free compounding.
Can I undo a Roth conversion?
No, as of the Tax Cuts and Jobs Act of 2017, Roth conversions are irrevocable. You cannot recharacterize (undo) a conversion. This makes careful planning essential before converting, as you will owe the taxes regardless of what happens to the investment value afterward.