Roth IRA Calculator
Project your Roth IRA growth — all gains are tax-free in retirement.
Formula
FV = Contribution×[(1+r)^n–1]/r×(1+r)
Example
$6,500/year at 9% from age 25 to 65 → ~$2.4M tax-free.
Understanding the Roth IRA
The Roth IRA is the only retirement account where you can withdraw your contributions (not earnings) at any age without penalty - making it the most flexible retirement vehicle in the US tax code. The Roth IRA calculator quantifies what tax-free growth produces over decades.
How it actually works
Project your Roth IRA growth — all gains are tax-free in retirement.
The formula is straightforward arithmetic once the inputs are correct; the value of the calculator is in handling the algebraic manipulation reliably and removing transcription errors. Plug in your specific inputs above and the result appears as you type, so you can immediately see how each variable affects the answer.
What the numbers really say
Contributing the 2026 max ($7,000/year) to a Roth IRA at 7% returns for 40 years produces $1.55 million - and not a dollar of that is taxable on withdrawal. The same contributions to a taxable brokerage account would face capital gains tax on roughly $1.27 million in gains - a $190,000-$300,000 tax savings depending on the rate.
The deeper context most users miss
Retirement planning has a counterintuitive feature: the closer you get to retirement, the less you can change. The 35-year-old who realizes they are behind can still catch up through aggressive saving and decades of compounding. The 60-year-old in the same position has essentially run out of math options - they are facing reduced retirement, delayed retirement, or both. This is why every personal finance writer says the same thing about retirement: start now, even small amounts, even if you do not know what you are doing. The 25-year-old saving $200/month into an index fund will outperform the 45-year-old saving $800/month into the same fund over a typical working life.
What people get wrong
- Missing the income limit. Roth IRA contributions phase out at $146,000-$161,000 modified AGI for singles in 2026, $230,000-$240,000 for MFJ. Above this, a backdoor Roth (contribute to Traditional, convert) still works.
- Withdrawing earnings early. Contributions can come out any time tax-free. Earnings withdrawn before 59-1/2 typically face tax + 10% penalty unless exceptions apply (first home purchase up to $10K, qualified education, disability).
- Confusing Roth contribution with Roth conversion. Contributions are limited to $7,000/yr ($8,000 for 50+). Conversions from Traditional IRAs have no limit but are taxable in the conversion year.
- Not contributing because of low income. Roth IRA needs earned income at least equal to the contribution. Stay-at-home spouses can use a Spousal IRA based on working spouse income.
When this calculator helps most
The roth ira calculator is most useful when you are making a real decision - comparing options, sizing a commitment, sanity-checking a quote, or planning ahead. The output is precise to your inputs; the inputs themselves are the place to slow down. Spend extra time on the assumptions you are making about rate, term, timing, or context-specific variables - those swing the answer far more than the formula's arithmetic does. A 5% change in the input often produces a 10-20% change in the output, which means small input errors compound into large output errors.
Where the math comes from
IRC Section 408A governs Roth IRAs. The IRS publishes annual contribution and income limits. Fidelity, Vanguard, and Schwab publish current Roth IRA conversion analyses and projection tools.
Questions and answers
Traditional or Roth IRA?
Roth wins if you expect higher taxes in retirement. Traditional wins if you expect lower. Young workers in lower brackets usually favor Roth; high earners in peak years often favor Traditional for current deduction.
Can I withdraw my Roth contributions?
Yes - your contributions can come out at any age tax-free and penalty-free. Earnings have age and time-based restrictions for tax-free withdrawal.
What is the 5-year rule?
Roth earnings can be withdrawn tax-free if (a) the account is 5+ years old AND (b) you are 59-1/2+. Both conditions must be met. Conversions have their own 5-year clock per conversion.
How does a backdoor Roth work?
Contribute (non-deductible) to a Traditional IRA, then convert to Roth. Used by high-income earners who exceed Roth income limits. The pro-rata rule complicates if you have other Traditional IRA balances.
What about RMDs?
Roth IRAs have no required minimum distributions during your lifetime - unique among retirement accounts. This makes them powerful estate planning vehicles.
Sources & References
Authoritative references consulted in building this calculator and educational content. These are primary sources — check directly for the most current figures.
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