Roth IRA Calculator
Project your tax-free retirement wealth. Enter your details below to see how compound growth, consistent contributions, and IRS-advantaged tax treatment work together over time.
Your Retirement Inputs
Adjust values to model your Roth IRA growth
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Compound Growth Projection
Roth IRA vs Taxable Account
The Engine Behind Your Roth IRA: Compound Growth
Albert Einstein reportedly called compound interest the eighth wonder of the world, and your Roth IRA is the purest vehicle to harness it. Unlike a savings account where growth is modest, a Roth IRA lets you invest in diversified funds that historically deliver 8–10% annually — and every dollar of that growth is tax-free when you withdraw it in retirement.
Growth Milestones: $7,000/Year at 8% Return
Based on $7,000 annual contributions at an 8% average return, no initial balance. Earnings grow tax-free in a Roth IRA.
Why Tax-Free Growth Is Your Biggest Financial Advantage
In a standard brokerage account, you owe capital gains taxes every time you sell a position, receive a dividend, or realize any gains. That annual tax drag can erode 20–30% of your investment returns over a career. With a Roth IRA, your investments grow in a completely tax-sheltered environment. You already paid income tax on the money you contributed, so when you pull it out in retirement, the IRS does not take another cent — not on the principal, not on the gains, not on the dividends.
Zero Capital Gains Tax
Sell winners, rebalance your portfolio, or switch funds inside your Roth — no taxable event occurs. This freedom lets you manage investments without worrying about triggering a tax bill.
Tax-Free Withdrawals Forever
After age 59½ and holding the account for 5+ years, every withdrawal is 100% tax-free. Your retirement income doesn't push you into a higher bracket or trigger Medicare surcharges.
No Required Minimum Distributions
Unlike Traditional IRAs and 401(k)s, Roth IRAs have no RMDs during the owner's lifetime. Your money stays invested and growing for as long as you want, giving you maximum control.
Estate Planning Powerhouse
Roth IRAs pass to heirs income-tax-free. While beneficiaries must draw down the balance within 10 years under current rules, they won't owe income taxes on those distributions.
How to Use This Roth IRA Calculator
Follow these three steps to generate your personalized retirement projection.
Set Your Timeline
Enter your current age and when you plan to retire. The longer your time horizon, the more compound growth works in your favor. Even a 5-year extension can add six figures to your final balance.
Define Your Contributions
Add your initial balance and annual contribution amount. The calculator respects IRS limits and automatically flags when you exceed them. Even small increases to your contribution can dramatically impact your final balance.
Review Your Projection
Instantly see your projected Roth IRA balance, total growth, lifetime tax savings, and how your Roth compares to a taxable brokerage account. Use the year-by-year table to see exactly how your money grows each year.
The Math Behind Your Roth IRA Projection
Our calculator uses the future value of annuity formula combined with a present value compound growth model. Here is how your results are computed, year by year:
For each year i from 1 to N (years until retirement), the Roth balance updates as: Balance(i) = [Balance(i-1) + Contribution] × (1 + r), where r is your expected annual return. Contributions are capped at the IRS limit for your age (with catch-up starting at 50).
The taxable account follows the same contribution schedule but applies your marginal tax rate to each year's investment gains: TaxableBalance(i) = TaxableBalance(i-1) + Contribution + Interest - (Interest × TaxRate). The difference between the two balances at retirement represents your tax-free advantage.
Key Formula Variables
Your current Roth IRA balance before any new contributions.
Amount you contribute each year, capped by IRS limits.
Expected annual investment return (e.g. 8% for diversified equity).
Number of years from your current age to your target retirement age.
Frequently Asked Questions
Common questions about using the Roth IRA calculator, contribution limits, and growth projections.
Our calculator uses the compound interest formula FV = P(1+r)^n + C × [((1+r)^n − 1) / r], where P is your starting balance, C is your annual contribution, r is the annual rate of return, and n is the number of years until retirement. It accounts for IRS contribution limits and catch-up contributions after age 50.
Historically, the S&P 500 has returned roughly 10% per year before inflation and about 7% after inflation. We default to 8% as a moderate estimate. Conservative investors may want to use 5–6%, while those heavily in equities might model 9–10%. The key is consistency over decades.
The calculator uses the current 2025 IRS limits of $7,000 per year (under 50) and $8,000 per year (50 and older). While the IRS adjusts limits periodically for inflation, future increases are not guaranteed, so we hold limits constant for conservative projections.
That gap represents the power of compound growth. When your investment earnings generate their own earnings year after year, your money grows exponentially. Over 30+ years, it is common for compound growth to produce 4–6× your total contributions.
Yes. Roth IRA and 401(k) contribution limits are completely separate. In 2025, you can contribute up to $7,000 to a Roth IRA and up to $23,500 to a 401(k). Many financial advisors recommend maxing both if you can afford it.
Starting at 40 means you have about 25 years until retirement at 65. Contributing $7,000/year at an 8% return could still grow to roughly $550,000. While starting earlier is ideal, the tax-free growth of a Roth IRA still delivers significant value even with a shorter time horizon.