How to Use This Calculator
- 1
Enter Traditional IRA Balance ($)
Input the current balance of your Traditional IRA that you are considering converting to a Roth IRA.
- 2
Specify Conversion Percentage (%)
Indicate what percentage of your Traditional IRA balance you wish to convert. This can be a partial or full conversion.
- 3
Input Current Tax Rate (%)
Provide your current marginal income tax rate, as this will be applied to the converted amount.
- 4
Enter Expected Retirement Tax Rate (%)
Estimate the marginal tax rate you anticipate paying in retirement, which helps compare future tax liabilities.
- 5
Optionally Expand Advanced Options
Adjust the assumed growth rate (default 7%) and years until retirement (default 20) to customize your projection.
- 6
Review Your Conversion Analysis
The calculator displays Roth Future Value, Tax Due on Conversion, Conversion Benefit vs. Traditional, Traditional After-Tax Value, and Breakeven Period. The Conversion Analysis insights panel shows your tax rate spread, effective conversion cost, and per-dollar growth comparison.
Example Calculation
An investor with a $50,000 Traditional IRA balance plans a 100% conversion to Roth. Their current marginal tax rate is 22%, and they expect a 20% rate in retirement.
Traditional IRA Balance ($)
50,000
Conversion Percentage (%)
100
Current Tax Rate (%)
22
Expected Retirement Tax Rate (%)
20
Results
Roth Future Value
$193,484
Tax Due on Conversion
$11,000
Conversion Benefit vs. Traditional
$38,697
Traditional After-Tax Value
$154,787
Breakeven Period
3.7 years
Tips
Convert in Low-Income Years
A Roth conversion is most tax-efficient in years when your income drops — between jobs, early retirement, or a sabbatical. The lower bracket means less tax on the converted amount.
Pay Taxes from Outside Funds
Pay the conversion tax from a taxable account, not from the IRA itself. Paying the $11,000 tax externally keeps the full $50,000 growing tax-free in the Roth.
Stagger Large Conversions
For large balances, split conversions over 2-3 years to avoid jumping into a higher bracket. Converting $25,000 per year at 22% is cheaper than converting $50,000 at 24%.
Use the Advanced Options
Adjust the growth rate and time horizon to see how different scenarios affect the breakeven point. A higher return shortens the breakeven, making conversion more attractive.
Estimating Taxes and Benefits of an IRA Conversion
The IRA Conversion Calculator helps you estimate the tax implications and long-term financial benefits of converting a Traditional IRA to a Roth IRA.
This strategic move can be highly advantageous for retirement planning, particularly if you anticipate higher tax rates in the future.
The tool compares future account values and calculates the breakeven point, providing clarity on the true cost and benefit of the conversion.
The Financial Logic Behind a Roth Conversion
Converting a Traditional IRA to a Roth IRA involves paying taxes on the converted amount in the current year.
In return, all future qualified withdrawals from the Roth IRA, including earnings, are entirely tax-free.
The calculator assesses this trade-off by comparing the future value of the converted Roth IRA (tax-free) against what the Traditional IRA would yield after being taxed in retirement.
The key calculations are:
Amount Converted = Traditional IRA Balance × (Conversion Percentage / 100)
Tax Due on Conversion = Amount Converted × (Current Tax Rate / 100)
Future Value Roth = Amount Converted × (1 + Growth Rate)^Years
Future Value Traditional (After Tax) = (Amount Converted × (1 + Growth Rate)^Years) × (1 - Retirement Tax Rate / 100)
Conversion Benefit = Future Value Roth - Future Value Traditional (After Tax)
Breakeven Period = ln(Amount Converted / Net Roth After Tax) / ln(1 + Growth Rate)
Projecting a $50,000 Roth IRA Conversion
Let's consider an investor with a $50,000 Traditional IRA balance who plans a full 100% conversion to a Roth IRA.
Their current marginal federal income tax rate is 22%, and they anticipate a 20% tax rate in retirement.
We'll project over 20 years with an assumed 7% annual growth rate.
- Traditional IRA Balance: $50,000
- Conversion Percentage: 100%
- Current Tax Rate: 22%
- Expected Retirement Tax Rate: 20%
- Growth Rate: 7%
- Years: 20
Calculations:
Amount Converted = $50,000 × (100 / 100) = $50,000
Tax Due on Conversion = $50,000 × (22 / 100) = $11,000
Net Roth After Tax = $50,000 - $11,000 = $39,000
Future Value Roth (20 years) = $50,000 × (1.07)^20 = $50,000 × 3.86968 = $193,484
Future Value Traditional (20 years, After Tax) = $193,484 × (1 - 0.20) = $193,484 × 0.80 = $154,787
Conversion Benefit = $193,484 - $154,787 = $38,697
Breakeven Period = ln(50,000 / 39,000) / ln(1.07) = 3.7 years
The Roth conversion results in a future value of $193,484 (tax-free), compared to $154,787 after-tax from the Traditional IRA — a $38,697 advantage.
The $11,000 tax cost pays for itself in approximately 3.7 years.
Strategic Roth IRA Conversions for Long-Term Tax Savings
A Roth IRA conversion is a powerful strategy for long-term tax savings, particularly appealing to investors who expect to be in a higher tax bracket during retirement.
By paying taxes on the converted amount now, future qualified withdrawals, including all earnings, become entirely tax-free.
This is a significant advantage, especially for younger investors with a long time horizon for their investments to grow.
For high-income earners who exceed the direct Roth contribution limits, the "backdoor Roth" strategy — involving a non-deductible Traditional IRA contribution followed by a conversion — allows them to still access the benefits of a Roth IRA. This approach is also valuable for estate planning, as Roth IRAs are not subject to Required Minimum Distributions (RMDs) for the original owner, allowing for continued tax-free growth.
Professional Considerations for Roth Conversions
Financial advisors approach Roth conversions with a holistic view, evaluating several client-specific factors.
Key considerations include the client's current income and marginal tax bracket versus their projected retirement bracket.
A conversion is most favorable when current tax rates are low.
Advisors also assess cash flow to ensure conversion taxes can be paid from outside the IRA, preserving the full converted amount for tax-free growth. The time horizon is critical — a longer period until retirement allows more time for tax-free growth to outweigh the upfront cost. Finally, advisors consider the impact on Medicare premiums (IRMAA) and the overall sequence of withdrawals in retirement, balancing taxable and tax-free income streams.
Frequently Asked Questions
What is an IRA conversion?
An IRA conversion involves moving funds from a tax-deferred Traditional IRA to a tax-free Roth IRA. The amount converted is treated as taxable income in the year of conversion, but future qualified withdrawals from the Roth IRA, including earnings, are entirely tax-free. This strategy is most advantageous when you expect to be in a higher tax bracket in retirement.
Why would someone convert a Traditional IRA to a Roth IRA?
Individuals convert to a Roth IRA to lock in tax-free withdrawals in retirement, bypass Required Minimum Distributions (RMDs) which apply to Traditional IRAs starting at age 73, and potentially leave a tax-free inheritance to beneficiaries. It is particularly valuable when current tax rates are lower than expected future rates.
What is the breakeven period for a Roth conversion?
The breakeven period is the time it takes for the tax-free growth in the Roth IRA to offset the upfront taxes paid on the conversion. For example, converting $50,000 at a 22% tax rate costs $11,000 in taxes, and the breakeven is approximately 3.7 years at 7% growth. After that point, the Roth conversion becomes increasingly advantageous.
Are there income limits for Roth IRA conversions?
No, there are no income limits for converting a Traditional IRA to a Roth IRA. While there are income limits for contributing directly to a Roth IRA ($161,000 MAGI for single filers in 2026), anyone can perform a Roth conversion regardless of income. This is commonly called a 'backdoor Roth' strategy.
How does the growth rate affect my conversion decision?
A higher growth rate makes conversion more attractive because more earnings accumulate tax-free in the Roth. At 7% growth, $50,000 becomes $193,484 in 20 years — all tax-free. In a Traditional IRA, that same $193,484 would be worth only $154,787 after paying 20% retirement tax on withdrawal.