Roth IRA Growth Calculator
Why the Roth IRA Is America's Most Flexible Retirement Account
The Roth IRA's core advantage is deceptively simple: pay taxes now on the money you contribute, and everything that grows inside the account — plus every dollar you take out in qualified retirement distributions — is completely tax-free. For a 30-year-old who maxes contributions for 35 years, that can mean over $800,000 in tax-free growth by retirement.
Roth vs. Traditional: Which Is Right for You?
A traditional IRA gives you a tax deduction today but taxes withdrawals in retirement. A Roth does the opposite — no deduction now, but no tax bill later. The right choice depends on whether you expect a higher or lower tax rate in retirement. Younger workers in their 20s and 30s are typically in lower brackets today, making Roth almost always the better choice. Peak earners in their 50s may prefer the immediate deduction of a traditional account. Many planners recommend holding both types for maximum flexibility — tax diversification is as valuable as portfolio diversification.
Real-World Roth IRA Example
A 30-year-old who maxes the Roth at $7,000/year for 35 years at 7% annual returns accumulates roughly $1.07 million by age 65. Total out-of-pocket: $245,000. Tax-free growth: $825,000. At a 22% retirement tax rate, a traditional IRA of the same size would trigger $235,000 in taxes on withdrawal — money the Roth owner keeps entirely. Pair this with the 401k calculator and the full retirement calculator to see your complete tax-optimized picture. For early retirees, the early retirement calculator shows how Roth contributions provide penalty-free access before 59½.
The Most Common Roth IRA Mistake
Waiting too long to open one. There is no "good time" — the best time to open a Roth IRA is the day you have earned income that fits within the contribution limits. Even $1,000 opened at age 22 grows to over $14,000 by age 65 at 7%. The second most common mistake: not knowing about the backdoor Roth option for high earners above the income limits. A financial advisor can walk through the mechanics if your income exceeds the phase-out thresholds.
Roth IRA FAQs
How do I calculate Roth IRA growth?
Use the future value formula: FV = P(1+r)^n + C×[((1+r)^n−1)/r]. Because Roth IRA qualified withdrawals are tax-free, the projected balance equals your fully spendable amount in retirement — no withholding applies. The key lever is time: at 7%, money doubles roughly every 10 years, so starting 10 years earlier can nearly double your final balance even at identical contribution levels.
What is a good Roth IRA balance at retirement?
A Roth IRA balance of $500,000–$1 million is a strong complement to Social Security and a 401k. At a 4% withdrawal rate, $750,000 generates $30,000/year in completely tax-free income. For the full picture, use the retirement income calculator to combine your Roth with all other income sources.
What are the Roth IRA contribution limits for 2024?
The 2024 Roth IRA contribution limit is $7,000 ($8,000 if you're 50+). Single filers phase out between $146,000–$161,000 MAGI; married filers between $230,000–$240,000. Above those limits, a backdoor Roth conversion — contributing to a nondeductible traditional IRA, then immediately converting — may still be available to you. Always consult a tax advisor before executing this strategy.
Can I contribute to both a Roth IRA and a 401k?
Yes — the limits are completely separate. The standard recommendation: first contribute to your 401k up to the employer match, then max your Roth IRA ($7,000 in 2024), then return to maximize 401k contributions up to the $23,000 limit. This captures free matching money first, then locks in tax-free growth. See the 401k calculator alongside this tool to model both accounts together.