A Roth IRA is a retirement account you fund with after-tax dollars — and the powerful part is that all the growth, and your eventual withdrawals in retirement, are completely tax-free. That makes decades of compounding especially valuable, because none of it is shared with the IRS later.
The default models about $583 a month (roughly the annual contribution limit spread over the year) at 7% for 30 years. Adjust it to your own contributions and timeline.
Why a Roth IRA supercharges compounding
In a regular taxable account, you can owe tax on dividends and gains along the way, which quietly drags on compounding. In a Roth IRA, nothing is taxed inside the account and qualified withdrawals in retirement are tax-free. So the entire balance the calculator shows is money you actually get to keep.
Because the benefit is on the growth, the longer your money compounds, the more a Roth is worth relative to a taxable account. Starting in your twenties versus your thirties can mean a dramatically larger tax-free sum — exactly the “cost of waiting” the visualizer below makes concrete.
Contribution limits and time horizon
The IRS caps annual Roth IRA contributions (in recent years, $7,000, or $8,000 if you’re 50 or older), and eligibility phases out at higher incomes. This calculator doesn’t enforce those limits — it simply projects whatever contribution you enter — so keep the current cap in mind when you set your monthly amount.
Because the limit is modest, time is your most important lever. Maxing a Roth consistently from a young age is one of the most reliable paths to a seven-figure retirement balance, even though the yearly contribution feels small.
What steady contributions could become
Contributing near the limit every year at a 7% long-run return can grow into a substantial tax-free nest egg over a working lifetime, with the majority of the final balance coming from growth rather than your deposits. The interest-versus-contributions split in the results makes that ratio obvious.
Remember this is a projection at an assumed average return, not a guarantee. Markets vary; use the likely-range toggle and the “in today’s money” view to keep your expectations grounded.
Frequently asked questions
How much will my Roth IRA grow?
It depends on how much you contribute, your return, and your time horizon. As an example, about $583 a month at 7% for 30 years can grow to well over half a million dollars — all tax-free. Enter your own numbers above for a personalized projection.
What is the Roth IRA contribution limit?
In recent years the annual limit has been $7,000, or $8,000 if you’re 50 or older, with eligibility phasing out at higher incomes. Limits change over time, so check the current year’s figure when planning.
Is a Roth IRA worth it?
For most long-term savers, yes — tax-free growth and tax-free retirement withdrawals are valuable, especially if you expect to be in a similar or higher tax bracket later. The longer your money compounds, the bigger the advantage.
Can you become a millionaire with a Roth IRA?
Yes. Consistently contributing near the limit from a young age at a reasonable long-run return can compound into seven figures by retirement — and because it’s a Roth, that balance is tax-free.