Converting money from a Traditional IRA to a Roth IRA can be an important part of a long-term retirement strategy. A Roth conversion generally involves moving eligible money from a Traditional IRA into a Roth IRA and potentially paying income tax on the taxable portion of the amount converted. Because the tax cost can vary substantially depending on your circumstances, estimating the potential liability before completing a conversion can be useful.
Convert IRA to Roth Calculator
What Is a Roth Conversion?
A Roth conversion is the process of moving money from a Traditional IRA or another eligible retirement account into a Roth IRA. Unlike qualified Roth IRA distributions, which can generally be tax-free when applicable requirements are met, the conversion itself may create taxable income.
The key issue is that not necessarily every dollar converted is automatically taxable.
For example, suppose you have a Traditional IRA containing both pre-tax and after-tax money. The portion representing pre-tax funds can generally be included in taxable income when converted. After-tax contributions may receive different treatment, subject to applicable tax rules and the aggregation and pro-rata rules.
That’s why the calculator includes a field called Percentage That Is Pre-Tax.
If you enter 100%, the calculator assumes the entire conversion is taxable before applying the estimated tax rates. If you enter 70%, it assumes 70% of the conversion amount is taxable.
This simplified approach is useful for estimating the tax exposure based on the assumptions you provide.
How to Use the Convert IRA to Roth Calculator
Using the calculator involves five main inputs.
1. Enter Your Traditional IRA Balance
Enter the current balance of the Traditional IRA you are considering converting.
For example:
- Traditional IRA balance: $100,000
The calculator uses this amount to make sure the conversion amount does not exceed the account balance.
2. Enter the Pre-Tax Percentage
Enter the estimated percentage of the IRA funds that are pre-tax.
For a Traditional IRA consisting entirely of pre-tax money, you might enter:
100%
If you have a mixture of pre-tax and after-tax amounts, you can enter an appropriate percentage based on your circumstances.
For example:
- Pre-tax percentage: 80%
The calculator will then treat 80% of the converted amount as taxable.
3. Enter Your Estimated Federal Tax Rate
Enter the federal tax rate you want to use for the estimate.
For example:
- Federal tax rate: 24%
This calculator applies the rate you enter directly to the estimated taxable amount.
In real-world tax planning, federal income taxes use tax brackets rather than one universal rate for all income. Therefore, the rate entered here should be viewed as an estimated rate or planning assumption.
4. Enter Your Estimated State Tax Rate
If applicable, enter your estimated state tax rate.
For example:
- State tax rate: 5%
If you are assuming no state income tax for your calculation, the calculator allows you to use 0%.
5. Enter the Amount to Convert
Enter the amount of the Traditional IRA you plan to convert.
For example:
- Amount to convert: $40,000
If you leave this field blank, the calculator assumes that you want to convert the entire Traditional IRA balance.
The conversion amount cannot exceed the IRA balance entered.
What the Calculator Shows
After you select Calculate, the tool provides several results.
Amount Converted
This is the amount of Traditional IRA money included in the estimated Roth conversion.
If you enter $40,000 as the conversion amount, the calculator reports:
$40,000.00
If you leave the conversion amount blank, the full IRA balance is used.
Estimated Taxable Amount
This represents the portion of the conversion assumed to be taxable based on the pre-tax percentage.
For example, if you convert $40,000 and 80% is pre-tax:
$40,000 × 80% = $32,000
The estimated taxable amount is therefore $32,000.
Estimated Federal Tax
The calculator applies your estimated federal tax rate to the taxable amount.
If the taxable amount is $32,000 and your estimated federal tax rate is 24%:
$32,000 × 24% = $7,680
The estimated federal tax is $7,680.
Estimated State Tax
The same basic approach is used for state tax.
If the taxable amount is $32,000 and the state tax rate is 5%:
$32,000 × 5% = $1,600
Estimated Total Tax
The estimated federal and state taxes are added together.
Using the previous example:
$7,680 + $1,600 = $9,280
The estimated total tax is therefore $9,280.
Estimated Amount Remaining After Tax
The calculator subtracts estimated taxes from the conversion amount.
Using the example:
$40,000 − $9,280 = $30,720
The estimated amount remaining after tax is $30,720.
This number should not automatically be interpreted as the amount deposited into the Roth IRA after taxes. In actual tax planning, the treatment and payment of conversion-related taxes can be more complicated. The calculator is showing a simple estimate based on its inputs.
Effective Combined Tax Rate
The calculator divides estimated total tax by the conversion amount.
For the example:
$9,280 ÷ $40,000 × 100 = 23.20%
The estimated effective combined tax rate is therefore 23.20%.
Convert IRA to Roth Calculator Formula
The calculator uses a series of straightforward formulas.
1. Taxable Amount Formula
The estimated taxable amount is:
Taxable Amount = Conversion Amount × Pre-Tax Percentage
Because the percentage is entered as a percentage, the calculation converts it to a decimal.
For example:
$50,000 × 80% = $40,000
So, $40,000 is treated as taxable in the calculator’s estimate.
2. Estimated Federal Tax Formula
The estimated federal tax is:
Federal Tax = Taxable Amount × Federal Tax Rate
For example:
$40,000 × 24% = $9,600
3. Estimated State Tax Formula
The estimated state tax is:
State Tax = Taxable Amount × State Tax Rate
For example:
$40,000 × 5% = $2,000
4. Estimated Total Tax Formula
The estimated total tax is:
Total Tax = Federal Tax + State Tax
For the example:
$9,600 + $2,000 = $11,600
5. Estimated Net Amount Formula
The calculator estimates the amount remaining after tax as:
Net Amount = Conversion Amount − Total Tax
For example:
$50,000 − $11,600 = $38,400
6. Effective Combined Tax Rate Formula
The effective combined rate is:
Effective Tax Rate = Total Tax ÷ Conversion Amount × 100
For the example:
$11,600 ÷ $50,000 × 100 = 23.20%
This provides a quick way to understand the estimated combined tax burden relative to the amount converted.
Worked Example: Converting $50,000 From a Traditional IRA
Consider a hypothetical investor with the following assumptions:
| Input | Example |
|---|---|
| Traditional IRA balance | $100,000 |
| Pre-tax percentage | 80% |
| Federal tax rate | 24% |
| State tax rate | 5% |
| Amount converted | $50,000 |
Step 1: Calculate the taxable portion
The calculator assumes that 80% of the $50,000 conversion is pre-tax:
$50,000 × 0.80 = $40,000
Estimated taxable amount: $40,000
Step 2: Estimate federal tax
$40,000 × 0.24 = $9,600
Estimated federal tax: $9,600
Step 3: Estimate state tax
$40,000 × 0.05 = $2,000
Estimated state tax: $2,000
Step 4: Calculate total estimated tax
$9,600 + $2,000 = $11,600
Estimated total tax: $11,600
Step 5: Calculate the amount remaining after estimated tax
$50,000 − $11,600 = $38,400
Estimated amount remaining after tax: $38,400
Step 6: Calculate the effective combined rate
$11,600 ÷ $50,000 × 100 = 23.20%
Estimated effective combined tax rate: 23.20%
This example demonstrates how changing the pre-tax percentage or estimated tax rates can materially change the estimated tax cost.
Full IRA Conversion Example
Suppose another investor has a $200,000 Traditional IRA and wants to convert the entire account.
Assume:
- IRA balance: $200,000
- Pre-tax percentage: 100%
- Federal tax rate: 22%
- State tax rate: 4%
- Conversion amount: blank
Because the conversion field is blank, the calculator uses the full $200,000 balance.
The taxable amount would be:
$200,000 × 100% = $200,000
Federal tax:
$200,000 × 22% = $44,000
State tax:
$200,000 × 4% = $8,000
Total estimated tax:
$44,000 + $8,000 = $52,000
Estimated amount remaining after tax:
$200,000 − $52,000 = $148,000
Effective combined tax rate:
$52,000 ÷ $200,000 × 100 = 26%
Again, these figures are simplified estimates based on the assumptions entered into the calculator.
Why the Pre-Tax Percentage Matters
The pre-tax percentage is one of the most important variables in this calculator.
Consider a $60,000 conversion with a 25% estimated federal tax rate and no state tax.
If 100% of the conversion is treated as pre-tax:
$60,000 × 100% = $60,000 taxable
Estimated federal tax:
$60,000 × 25% = $15,000
But if only 50% is treated as pre-tax:
$60,000 × 50% = $30,000 taxable
Estimated federal tax:
$30,000 × 25% = $7,500
The difference is significant.
However, determining the taxable portion of an IRA conversion can involve more than simply estimating a percentage. People with nondeductible IRA contributions or multiple Traditional, SEP, or SIMPLE IRAs may need to consider applicable tax rules and the pro-rata calculation.
Roth Conversion Taxes and Tax Brackets
One of the most important limitations of a simple Roth conversion calculator is that federal income tax generally works through tax brackets.
A conversion can increase taxable income and potentially cause some income to fall into higher marginal tax brackets. Therefore, entering one estimated federal tax rate is a simplification.
For planning purposes, users may want to compare several scenarios rather than relying on one estimate.
For example:
| Scenario | Conversion | Pre-Tax | Federal Rate | State Rate |
|---|---|---|---|---|
| Small conversion | $20,000 | 100% | 22% | 5% |
| Medium conversion | $40,000 | 100% | 24% | 5% |
| Larger conversion | $60,000 | 100% | 24% | 5% |
| Partial-taxable conversion | $60,000 | 70% | 24% | 5% |
Comparing scenarios can help you see how the estimated tax changes as the conversion amount or taxable percentage changes.
Partial Roth Conversions
You do not necessarily have to model a Roth conversion as an all-or-nothing decision.
The calculator allows you to enter a specific Amount to Convert. This makes it useful for comparing partial conversion scenarios.
For example, instead of entering the full $150,000 IRA balance, you might evaluate:
- $10,000 conversion
- $25,000 conversion
- $50,000 conversion
- $75,000 conversion
- Full conversion
You can compare the estimated tax associated with each amount.
Partial conversions can also be considered when an individual wants to manage the amount of additional taxable income generated in a particular year. The appropriate amount depends on the person’s broader financial and tax situation.
Should You Pay Conversion Taxes From the IRA?
The source of the money used to pay taxes is an important planning consideration.
If you are converting money to a Roth IRA, using outside funds to pay the resulting tax may allow more of the retirement account to remain invested inside the Roth IRA. On the other hand, using IRA assets to cover taxes can reduce the amount ultimately converted and may have additional consequences depending on the person’s age and circumstances.
The calculator does not determine which funding method is appropriate. It simply estimates taxes based on the taxable amount and tax rates you enter.
Because the consequences can vary by situation, consider discussing the tax payment strategy with a qualified professional.
Factors That Can Affect a Roth Conversion
The calculator provides a simplified estimate, but actual results can depend on many factors.
Filing Status
Your federal tax situation can depend on whether you file as single, married filing jointly, married filing separately, head of household, or another applicable status.
Other Income
Wages, business income, investment income, pensions, Social Security benefits, and other taxable income can affect your overall tax situation.
Deductions and Credits
Available deductions and credits can affect taxable income and the final tax liability.
IRA Contributions
Whether IRA contributions were deductible or nondeductible can affect the taxable portion of a conversion.
Multiple Retirement Accounts
Individuals with multiple Traditional, SEP, or SIMPLE IRAs may need to consider applicable aggregation and pro-rata rules when determining the taxable portion of a conversion.
State Taxes
State income tax treatment varies. Some states impose individual income taxes, while others have different rules or no broad individual income tax.
Future Tax Rates
A Roth conversion is not simply about today’s tax bill. Long-term planning can also involve expectations about future taxable income and future tax treatment.
Roth IRA Conversion vs. Traditional IRA
A Traditional IRA and Roth IRA have different tax characteristics.
| Feature | Traditional IRA | Roth IRA |
|---|---|---|
| Contributions | May be deductible depending on circumstances | Generally not deductible |
| Investment growth | Generally tax-deferred | Generally tax-free when qualified |
| Taxation of qualified withdrawals | Generally taxable | Generally tax-free |
| Roth conversion | Can create taxable income | Not applicable to an existing Roth balance |
| Required distributions | Rules apply to Traditional IRA owners | Roth IRA owner rules differ |
The exact tax treatment depends on the account, transaction, taxpayer, and applicable rules.
When a Roth Conversion May Require Extra Planning
A Roth conversion can interact with other parts of your financial picture.
For example, a conversion can increase taxable income for the year. That may affect calculations or thresholds that depend on income. It can also be relevant when planning retirement withdrawals, charitable giving, Medicare-related income considerations, or other tax-sensitive decisions.
For that reason, a Roth conversion should generally be considered as part of an overall tax plan rather than as an isolated calculation.
How to Use the Calculator for Scenario Planning
One useful approach is to run multiple calculations.
Scenario A: Small Conversion
Enter a smaller conversion amount and record:
- Taxable amount
- Federal tax
- State tax
- Total tax
- Effective tax rate
Scenario B: Medium Conversion
Increase the conversion amount and compare the results.
Scenario C: Full Conversion
Leave the conversion amount blank to estimate a conversion of the entire IRA balance.
You can then compare the estimated tax costs and net amounts.
This does not determine the appropriate conversion strategy, but it gives you a numerical framework for discussing different possibilities with a tax or financial professional.
Important Limitations of This IRA to Roth Calculator
This tool is intentionally straightforward. It does not attempt to replicate a complete federal or state income tax return.
In particular, it does not calculate:
- Detailed federal tax brackets
- Filing-status-specific tax calculations
- Deductions
- Tax credits
- Alternative Minimum Tax
- Net Investment Income Tax
- Other income sources
- Detailed state tax systems
- Individual tax basis calculations
- Complete pro-rata calculations across all applicable IRA accounts
- Future investment growth
- Future Roth withdrawals
- Required minimum distribution calculations
- Personalized tax planning
The calculator instead applies the percentages you enter to the estimated taxable portion of the conversion.
Therefore, the results should be treated as planning estimates rather than exact tax liabilities.
Frequently Asked Questions
1. What is a Roth IRA conversion?
A Roth IRA conversion generally involves moving eligible funds from a Traditional IRA or another qualifying retirement account into a Roth IRA. The taxable portion of the conversion can generally be included in income for tax purposes.
2. Is a Roth conversion taxable?
A Roth conversion can create taxable income. The amount subject to tax depends on factors such as the nature of the IRA funds and the applicable tax rules. This calculator estimates the taxable portion using the pre-tax percentage you enter.
3. How does the Convert IRA to Roth Calculator work?
The calculator takes your IRA balance, pre-tax percentage, estimated federal tax rate, state tax rate, and conversion amount. It estimates the taxable amount and then calculates estimated federal, state, and combined taxes.
4. What does the pre-tax percentage mean?
The pre-tax percentage represents the portion of the conversion that the calculator assumes is made up of pre-tax funds. For example, entering 80% means the calculator treats 80% of the conversion amount as taxable.
5. What happens if I leave the conversion amount blank?
If you leave the conversion amount blank, the calculator assumes that you want to convert the entire Traditional IRA balance.
6. Can I use the calculator for a partial Roth conversion?
Yes. Enter the specific amount you want to convert. The calculator will use that amount rather than the full IRA balance.
7. Does the calculator calculate actual federal income tax?
No. It provides an estimate based on the federal tax rate you enter. Actual federal tax can depend on your filing status, total income, deductions, credits, tax brackets, and other factors.
8. Does state tax apply to Roth conversions?
State treatment varies by jurisdiction. If applicable, you can enter an estimated state tax rate to calculate an estimated state tax amount.
9. What is the effective combined tax rate?
The effective combined tax rate is the estimated total federal and state tax divided by the amount converted. It provides a simple percentage representation of the estimated tax cost relative to the conversion.
10. Why is my taxable amount lower than my conversion amount?
If you entered a pre-tax percentage below 100%, the calculator treats only that percentage of the conversion as taxable. For example, a $50,000 conversion with a 60% pre-tax percentage produces an estimated taxable amount of $30,000.
11. Can I convert my entire Traditional IRA to a Roth IRA?
A full conversion may be possible depending on your circumstances, but it can create a substantial taxable amount. The calculator can estimate the tax exposure by leaving the conversion amount blank.
12. Should I convert my entire IRA at once?
There is no universal answer. Some people may consider partial conversions to manage the amount of taxable income generated in a particular year. The appropriate approach depends on individual tax and retirement circumstances.
13. Does the calculator account for deductions?
No. The calculator applies the tax rates you provide directly to the estimated taxable amount. It does not calculate deductions or tax credits.
14. Can nondeductible IRA contributions affect a Roth conversion?
Yes. Nondeductible contributions can affect the tax treatment of a conversion. Individuals with after-tax IRA basis may need a more detailed calculation, including applicable pro-rata rules.
15. Is the calculator’s result an exact tax bill?
No. It is an estimate for planning purposes. Actual tax liability can depend on numerous factors, including income, filing status, deductions, other retirement accounts, tax brackets, state rules, and the specific tax treatment of your IRA funds.
Final Thoughts
A Roth conversion can have significant tax implications, so understanding the potential cost before converting funds can be valuable. The Convert IRA to Roth Calculator offers a simple way to estimate how much of a planned conversion may be taxable and how estimated federal and state tax rates could affect the result.
To use the calculator effectively, enter your Traditional IRA balance, pre-tax percentage, estimated federal tax rate, estimated state tax rate, and conversion amount. If you want to estimate a full conversion, leave the conversion amount blank.
The calculator then provides an estimate of the converted amount, taxable amount, federal tax, state tax, total tax, net amount after estimated tax, and effective combined tax rate.
For a more realistic planning exercise, run several conversion amounts and compare the resulting estimates. Keep in mind that a simple percentage-based estimate cannot replace a detailed tax calculation. Your actual tax liability may depend on your complete income picture, filing status, deductions, IRA basis, other retirement accounts, state tax rules, and other circumstances.
Before making a substantial Roth conversion, consider reviewing the numbers with a qualified tax or financial professional who can evaluate the transaction in the context of your complete financial situation.