How a Roth IRA grows
A Roth IRA is an individual retirement account you fund with money you've already paid tax on. In exchange, your investments grow without yearly tax, and qualified withdrawals in retirement are tax free. You can open one at most brokerages and choose your own investments. It's one of the most flexible retirement accounts, and you don't need an employer to get one.
Enter your age, balance, yearly contribution, expected return, retirement age and tax rate. The calculator caps your contribution at the IRS limit for your age, works through each year and shows your balance at retirement. It also estimates what you'd save compared with paying tax on that growth in a regular taxable account. The example starts at 30 with $10,000 and adds $7,500 a year at 7%.
For 2026, you can contribute up to $7,500, or $8,600 if you're 50 or older. Your income can limit that: the allowed amount phases out from $153,000 to $168,000 for single filers and from $242,000 to $252,000 for married couples filing jointly. See the IRS limits. The calculator holds limits flat in future years, so long projections may run a little low.
Two rules are worth remembering. You can take out your own contributions at any time without tax or penalty, which makes a Roth more flexible than most retirement accounts. Earnings are tax free only if you're at least 59½ and it's been five years since your first Roth contribution. Otherwise, earnings can owe tax and a 10% penalty, with some exceptions. Returns here are steady and hypothetical, so real results will vary.
The calculator also checks your income. Enter your modified AGI and filing status, and it shows how much you can put in for 2026. At $100,000 as a single filer, you can contribute the full $7,500. At $160,000, the limit drops to $4,000, because you're about halfway through the $153,000 to $168,000 phase-out. A married couple filing jointly at $245,000, both 55, could each put in $6,020 of the $8,600 catch-up limit. Above the range, it notes the backdoor Roth, a common route that has its own tax rules.
Maxing out a Roth IRA from different ages
This shows contributions of $7,500 a year until age 65 at a steady 7% return, starting from zero, with limits held at the 2026 level before catch-ups.
| Start at age | Years | You contribute | Balance at 65 |
|---|---|---|---|
| 25 | 40 | $300,000 | $1,497,263 |
| 30 | 35 | $262,500 | $1,036,777 |
| 40 | 25 | $187,500 | $474,368 |
| 50 | 15 | $112,500 | $188,468 |
Figures assume year-end contributions and leave out the catch-up. The calculator adds contributions monthly, so its results run slightly higher.