Roth IRA Calculator

About the Roth IRA Calculator

A Roth IRA calculator projects the tax-free growth of your Roth Individual Retirement Account and — critically — compares it head-to-head with a Traditional IRA to help you make the most important retirement tax decision: pay taxes now or pay taxes later. The Roth IRA is one of the most powerful wealth-building vehicles available to American savers. Contributions are made with after-tax dollars, meaning you get no deduction today, but all qualified withdrawals in retirement — including all investment gains — are completely tax-free. For younger workers who expect to be in a higher tax bracket in retirement, the Roth IRA is often the superior choice. Our free Roth IRA calculator shows your projected balance at retirement, the after-tax comparison against a Traditional IRA, and the real-dollar advantage of choosing the right account type. It uses your current tax rate and expected retirement tax rate to model which approach will leave you with more spendable money in retirement. The 2025 contribution limit of $7,000 per year ($8,000 age 50+) applies to all IRA contributions combined, with income phase-outs starting at $150,000 for single filers.

How It Works

The Roth IRA projection compounds your after-tax contributions at your expected annual return: Balance(year) = Prior Balance x (1 + r) + Annual Contribution. For the Traditional IRA comparison, contributions are pre-tax — meaning you can invest slightly more per year because you have not paid tax yet on those dollars. Traditional contribution equivalent = Roth contribution / (1 - current tax rate). At retirement, the Roth balance is yours tax-free. The Traditional balance is reduced by your expected retirement tax rate to get the spendable amount. Example: Age 28, contributing $7,000/year to Roth until age 65 (37 years), $10,000 starting balance, 7% return, 24% current tax rate, 22% expected retirement rate. Roth final balance: $1,245,000 (tax-free). Traditional balance: $1,302,000 but after 22% tax = $1,016,000. Roth wins by $229,000. Reversing the tax rates — say you expect to be in a lower bracket in retirement — can shift the advantage to Traditional. The calculator shows exactly which account type wins under your specific tax situation.

Tips & Best Practices

• ✓The Roth IRA advantage is largest when your current tax rate is low and you expect higher rates in retirement — making it ideal for young earners in their 20s and 30s before reaching peak earnings years.
• ✓Roth IRA contributions (not earnings) can be withdrawn at any time, penalty-free and tax-free — making the Roth function as an emergency fund of last resort without sacrificing retirement savings permanently.
• ✓Backdoor Roth IRA: if your income exceeds the Roth contribution limits, you can contribute to a non-deductible Traditional IRA then immediately convert to Roth — a legal strategy used by high earners to access tax-free growth.
• ✓Time in the market amplifies the Roth advantage: a $7,000 contribution at age 25 grows to approximately $106,000 by age 65 at 7% — all tax-free. The same contribution at age 45 grows to only $27,000. Starting decades earlier compounds to a far larger tax-free number.
• ✓Roth conversions in low-income years: if you have a year with unusually low income (sabbatical, career change, early retirement), converting Traditional IRA or 401(k) balances to Roth while in a lower bracket permanently reduces future Required Minimum Distributions and builds tax-free wealth.
• ✓Unlike Traditional IRAs, Roth IRAs have no Required Minimum Distributions during your lifetime — meaning the tax-free money can continue compounding indefinitely and be passed to heirs who then inherit the account tax-advantaged.
• ✓The 5-year rule: Roth IRA earnings cannot be withdrawn tax-free until the account has been open for at least 5 years AND you are at least 59½. Open a Roth IRA as early as possible to start the 5-year clock, even if you only contribute a small amount initially.

Who Uses This Calculator

Young workers deciding between Roth and Traditional 401(k) or IRA contributions. High earners evaluating backdoor Roth IRA strategies. Pre-retirees comparing their expected tax situation now versus in retirement. Financial planners demonstrating the tax-free compounding benefit of early Roth contributions. People planning estate wealth transfer and seeking to minimize heirs tax burden.