Calculated using standard mathematical and industry formulas.
Compare Traditional IRA and Roth IRA tax growth under annual IRS contribution limits ($7,000 in 2026). Traditional IRAs provide immediate tax deductions with taxed withdrawals; Roth IRAs use post-tax dollars to deliver 100% tax-free capital growth and tax-free retirement withdrawals.
How to use this calculator?
Enter your current age and target retirement age.
Enter your annual contribution amount (IRS annual limit is $7,000 for under age 50, $8,000 for age 50+).
Set your expected annual investment growth rate.
Enter your current marginal tax bracket and expected retirement tax bracket.
Compare your final after-tax nest egg in a Roth IRA versus a Traditional IRA.
Formula & calculation method
Roth vs. Traditional IRA Tax Growth Equations
Roth IRA Net = PMT × [ ((1 + r)^n - 1) / r ] (Tax-Free Withdrawals); Traditional IRA Net = Pre-Tax Capital × (1 - Retirement Tax Rate)
r = annual return rate, n = years until retirement.
Step-by-step calculation example
$7,000/yr over 35 yrs @ 7% return → $967,634 gross balance. Roth IRA yields $967,634 tax-free vs Traditional IRA $822,489 (after 15% tax).
Key insights to remember
Roth IRAs grow 100% tax-free and allow completely tax-free withdrawals in retirement, making them superior if you expect your tax rate to stay equal or rise.
Traditional IRAs provide immediate up-front tax deductions today, making them advantageous if your tax bracket drops significantly in retirement.
Roth IRAs have no Required Minimum Distributions (RMDs) during the owner's lifetime, allowing wealth to compound indefinitely or pass tax-free to heirs.
You can contribute to both a Roth and Traditional IRA, but your combined total contribution across all IRAs cannot exceed the annual IRS limit.
How to interpret your results?
Roth vs. Traditional Strategy
Roth IRAs favor investors who expect their future retirement tax bracket to be equal to or higher than today. Traditional IRAs maximize tax relief during peak earning years.
Expert advice & guidance
💡 Tax tip: You can contribute to both an employer 401(k) and a personal IRA simultaneously, compounding tax-advantaged growth across both accounts.
Frequently asked questions
What is an IRA account and how does it work?
An Individual Retirement Account (IRA) is a tax-advantaged personal retirement vehicle. Traditional IRAs offer upfront tax deductions with taxed future withdrawals, whereas Roth IRAs use after-tax dollars for tax-free compounding growth.
What is a Roth IRA and what are its tax benefits?
A Roth IRA is a retirement account funded with after-tax money. Because taxes are paid upfront, all principal growth, dividends, and future withdrawals in retirement are 100% exempt from federal and state income tax.
How does a Roth IRA work?
Money deposited in a Roth IRA is invested in stocks, bonds, or ETFs. Contributions can be withdrawn anytime tax-free and penalty-free. Investment earnings become tax-free after reaching age 59½ and satisfying the 5-year holding rule.
How to open a Roth IRA account?
To open a Roth IRA: select an online brokerage (Fidelity, Vanguard, Charles Schwab), complete an online application, verify income eligibility under IRS MAGI limits, link a bank account, and allocate funds into investments.
Related calculators
Retirement Calculator: Nest Egg & 4% Rule — Estimate your required retirement savings nest egg, projected monthly income under the 4% safe withdrawal rule, and retirement readiness timeline.
Compound Interest Calculator: Savings Growth — Calculate compound interest and future portfolio balance with monthly deposits. Visualize exponential wealth accumulation with compounding returns.
Savings Goal Calculator: Monthly Deposit Plan — Calculate how much to save each month or how long it takes to reach your financial savings goal. Plan with compound interest, HYSA rates, and 50/30/20 budgets.