Tax and Planning Calculators
Roth IRA Calculator
Roth IRA Calculator project Roth IRA growth and compare it with a simplified taxable account subject to annual return tax drag.
Tax and Planning Calculators
Roth IRA Calculator
Project Roth IRA growth and compare it with a simplified taxable account subject to annual return tax drag.
Formula
Roth grows at full entered return plus year-end contributions; comparison account grows at return x (1-tax-on-return) plus the same contributions; subtract balances for tax-drag advantage.
About the Roth IRA Calculator
Project Roth IRA growth and compare it with a simplified taxable account subject to annual return tax drag. Tax and planning calculators estimate a named scenario from the entered income, contribution, benefit, rate, timing, or jurisdiction assumptions.
How the Roth IRA Calculator Works
Roth grows at full entered return plus year-end contributions; comparison account grows at return x (1-tax-on-return) plus the same contributions; subtract balances for tax-drag advantage.
The calculation runs in your browser. Submitted values are validated for the required numeric range, data shape, units, and method-specific restrictions before a result is shown.
Required Inputs
- Starting Roth balance (required)
- Annual contribution (required)
- Years (required)
- Annual return (%) (required)
- Tax rate on taxable account return (%) (required)
Results Reported
The result panel shows the final answer together with the intermediate quantities needed to audit the calculation. Depending on this method, reported values include:
starting_balanceannual_contributionyearsroth_projected_balancetotal_cash_contributedroth_projected_growthsimplified_taxable_account_balanceprojected_roth_advantage_from_tax_dragowner_lifetime_rmd_assumedqualified_withdrawal_tax_assumed
Roth IRA Calculator Example
Use the example data button, calculate, then review the result table, formula, and worked solution before using the answer.
| Input | Example value |
|---|---|
| Starting Roth balance | 10000 |
| Annual contribution | 7000 |
| Years | 20 |
| Annual return (%) | 7 |
| Tax rate on taxable account return (%) | 20 |
How to Use the Calculator
- Confirm that the calculator title and method match the quantity, test, conversion, or planning question you need to solve.
- Enter values with compatible units and the requested sample, group, matrix, count, date, or option format.
- Select Example Data to inspect a valid input layout, or enter your own values and select Calculate.
- Review the result table, formula, worked substitutions, warnings, and interpretation rather than using only the headline number.
- Use Copy Result or Download CSV when you need a reusable record of the displayed calculation.
Understanding the Result
Tax rules and thresholds can change and personal circumstances vary, so confirm important decisions with current official guidance or a qualified adviser.
Keep the entered values, units, selected options, and any warning shown beside the result. For a hypothesis test, report the statistic, degrees of freedom where applicable, p-value, alpha level, effect size, and decision. For an estimate or conversion, report the formula convention and final unit.
Accuracy and Limitations
The calculator keeps full browser precision during calculation and rounds only for display. Accuracy still depends on correct inputs and on whether the displayed model represents the real problem. Educational calculators cannot replace required professional review, current official rules, field measurements, laboratory methods, or specialist statistical software where those are necessary.
Frequently Asked Questions
What does the Roth IRA Calculator calculate?
Project Roth IRA growth and compare it with a simplified taxable account subject to annual return tax drag.
Which formula does the Roth IRA Calculator use?
Roth grows at full entered return plus year-end contributions; comparison account grows at return x (1-tax-on-return) plus the same contributions; subtract balances for tax-drag advantage.
Is this a separate calculator?
Yes. This page has its own public URL, inputs, formula notes, browser function, fixture, and worked solution.
What should I verify before using the answer?
Check the entered values, units, selected options, formula convention, warnings, and result interpretation shown on this calculator page.