Roth IRA Calculator

Roth IRA Calculator

A Roth IRA is one of the most powerful tax-free wealth-building tools available to U.S. investors. You contribute after-tax dollars now, and every dollar of growth — dividends, capital gains, and interest — comes out completely tax-free in retirement. This calculator shows your projected balance at retirement, how much of that balance is pure tax-free growth, the estimated taxes you avoid compared to a taxable account, and a sustainable monthly income figure based on a 25-year drawdown. The numbers reflect exactly what you get to spend, not what you owe the IRS.

How Roth IRA Growth Is Calculated

The calculator compounds annual contributions at your expected return rate each year using this sequence:

• Year-end Balance = (Prior Balance + Annual Contribution) x (1 + Return Rate)
• Tax-Free Growth = Final Balance - Total Lifetime Contributions
• Estimated Tax Savings = Tax-Free Growth x 22% (assumed marginal rate in retirement)
• Sustainable Monthly Income = Final Balance / (25 years x 12 months)

The 2026 annual contribution limit is $7,000 ($8,000 if age 50 or older). Exceeding these limits triggers a 6% IRS penalty on the excess for every year it remains in the account.

Worked Examples

Scenario 1 — Early starter, age 25: Maria opens a Roth IRA at 25 with a $3,000 balance and contributes $7,000 per year until age 65. At a 7% return, her balance reaches approximately $1,530,000. Total contributions: $280,000. Tax-free growth: $1,250,000. In a taxable account at a 15% capital gains rate, she would owe roughly $187,500 on those gains. Monthly income in retirement: $5,100.

Scenario 2 — Mid-career catch-up, age 40: David starts at 40 with $50,000 already saved and contributes the $8,000 catch-up limit each year until 65. At 7%, he reaches roughly $700,000. Total contributions: $250,000. Tax-free growth: $450,000. Estimated tax savings versus a taxable account: $67,500. Monthly retirement income: $2,333.

Scenario 3 — Consistent contributor, age 30: Sarah has $15,000 at age 30 and contributes $7,000 every year to 65 at 7%. Final balance: approximately $1,015,000. Her $245,000 in contributions grew by $770,000 tax-free — at a 22% marginal rate, that avoids $169,400 in taxes. Monthly income: $3,383.

Roth IRA Growth Reference Table

When to Use This Calculator

• You want to see whether your current contribution rate puts you on track for a specific retirement income target
• You are deciding between a Roth IRA and a Traditional IRA and need to compare the tax-free growth advantage in dollar terms
• You are evaluating a backdoor Roth conversion and want to project the long-term payoff against the upfront tax cost
• You recently got a raise and are modeling what increasing your annual contribution from $5,000 to $7,000 adds at retirement
• You are helping a younger family member understand why starting a Roth IRA at 22 versus 32 creates a $700,000+ difference

Common Mistakes to Avoid

1. Contributing above the income limit without a backdoor strategy. In 2026, single filers with MAGI above $165,000 cannot contribute directly. If you do anyway and the IRS flags it, the penalty is 6% per year on the excess — on a $7,000 over-contribution held for 5 years, that is $2,100 in penalties alone, plus potential interest.

2. Withdrawing contributions “just this once.” Your contributions can come out penalty-free at any time, but removing $10,000 at age 40 does not just cost $10,000 — at 7% growth over 25 years that withdrawal costs you roughly $54,000 in lost retirement balance.

3. Sitting in cash inside the Roth IRA. Many people open a Roth IRA at a brokerage and never invest the cash in a fund. A $20,000 cash balance sitting uninvested for 10 years at 0% versus 7% is a $19,400 opportunity cost — and it is an extremely common error.

4. Missing the annual contribution deadline. The IRS allows Roth IRA contributions for a given tax year until the April 15 filing deadline of the following year. Missing this window permanently forfeits that year’s contribution room — you cannot go back and make it up. At $7,000 per missed year compounding at 7% for 20 years, each lapse costs roughly $27,100 in future tax-free balance.

Current Context for 2026

• 2026 contribution limit: $7,000 (under age 50); $8,000 (age 50 or older)
• Income phase-out for single filers: $150,000 — $165,000 MAGI (estimated; IRS adjusts annually)
• Income phase-out for married filing jointly: $236,000 — $246,000 MAGI (estimated)
• 5-year rule: Roth IRA must be open for at least 5 tax years before earnings can be withdrawn tax-free, regardless of age
• No required minimum distributions (RMDs): Unlike Traditional IRAs, Roth IRAs have no RMD requirement during the account owner’s lifetime
• Backdoor Roth: Still legal in 2026 for high earners; watch the pro-rata rule if you hold other pre-tax IRA balances
• Market reference rate: The S&P 500 has returned approximately 10% annually over the past 50 years; a 60/40 portfolio averages closer to 6-7%

Tips

1. Max out every year without exception. At 7% growth, a single missed $7,000 contribution at age 30 costs approximately $74,000 in final retirement balance at age 65. No other action has this magnitude of impact.
2. Open the account early, even with $500. The 5-year clock starts the first tax year you make any contribution. If you open at 22 and retire at 60, the clock has been running for 38 years — all withdrawals are fully tax-free.
3. Invest in growth-heavy assets inside the Roth. Because gains are never taxed, the Roth IRA is the best account to hold high-growth assets like broad stock index funds. Hold bonds and dividend-heavy funds in tax-deferred accounts instead.
4. Use the backdoor Roth if income exceeds the limit. Contribute to a non-deductible Traditional IRA, then convert promptly. If you have no other pre-tax IRA balances, the conversion is nearly tax-free. Do not let income limits stop you entirely.
5. Do not treat your Roth IRA as an emergency fund. Contributions can be withdrawn tax and penalty-free, but doing so destroys tax-free compounding. Build a 3-6 month cash emergency fund separately so the Roth stays untouched.
6. Increase contributions with every raise. If you get a $3,000 raise, direct $583/month more toward Roth contributions and bring yourself closer to the annual maximum. The marginal tax cost is the same rate you are already paying.

Related Calculations

• Traditional IRA Calculator — compare pre-tax deductions now against taxable withdrawals later to determine which account type wins at your expected tax rates
• 401(k) Calculator — model employer match, pre-tax contributions, and projected balance; most people should capture the full match before funding a Roth IRA
• Compound Interest Calculator — isolate the compounding mechanics without contribution limits to understand return-rate sensitivity
• Retirement Calculator — combine all retirement accounts into a single projection showing total income readiness
• Tax Calculator — estimate your current marginal tax rate to decide whether a Roth (pay taxes now) or Traditional (defer taxes) is more advantageous this year