What is a Roth IRA and How Does It Work?

A Roth IRA is an individual retirement (IRA) account funded with after-tax dollars. Your contributions have the potential to grow tax-free, and qualified withdrawals in retirement are also tax-free. It is one of the most powerful tax-advantaged accounts available to U.S. taxpayers, and is especially valuable if you’re a young investor likely to be in a higher tax bracket later in your career than you are today.

This guide walks through how a Roth IRA works, the 2026 contribution and income limits, withdrawal rules, and whether one fits your situation. If you’re comparing Roth to traditional IRAs, see our deep-dive on the difference between a Roth IRA and a traditional IRA for the full breakdown.

How a Roth IRA works in 3 steps

A Roth IRA works in 3 steps:

1. Contribute after-tax dollars (money you’ve already paid income tax on)
2. Let the money have the chance to grow tax-free while invested in stocks, bonds, ETFs, or mutual funds
3. Withdraw it tax-free in retirement (as long as you’re at least age 59½ and the account has been open for at least five years)
    

The tax advantage is a trade-off with timing. With a traditional IRA, you deduct contributions from your current taxable income and pay tax later when you withdraw. With a Roth IRA, you pay tax now and skip it entirely in retirement. If your future tax rate is higher than your current one, which is often true for young earners early in their career, paying taxes today can save you from paying more later.

Roth IRAs are funded by you, not your employer. You open one at a brokerage or robo-advisor, contribute up to the annual limit, and choose how the money is invested. There’s no required minimum distribution (RMD), which means the money can be invested tax-free for as long as you want.

Why is a Roth IRA especially good for young investors?

Young investors get more value from a Roth IRA than almost any other group because of a simple tax-bracket calculation. When you’re in the early stages of your career, you’re usually in a lower tax bracket than you’ll be in later. Paying taxes on your contributions at today’s lower rate, letting that money compound tax-free for 30 to 40 years, then pulling it out tax-free in retirement.

Here’s what that math could look like: Assuming an 8% average annual return, if a 22-year-old contributes $200/month to a Roth IRA, by age 65 they’d have roughly $530,000. Every dollar of that, including the ~$426,000 in investment earnings, can come out tax-free in retirement.

The same $200/month in a taxable brokerage account would end up smaller, because investment earnings get taxed along the way (dividends, capital gains). Tax-free compound growth potential over decades is the Roth IRA’s defining advantage.

2026 Roth IRA contribution and income limits

For 2026, the Roth IRA contribution limit is $7,500 ($8,600 if you’re 50 or older), and contribution eligibility phases out between $153,000 and $168,000 for single filers and between $242,000 and $252,000 for married couples filing jointly, per IRS Notice 2025-67. Here’s the full breakdown:

Contribution limits for 2026

• $7,500 if you’re under 50
• $8,600 if you’re 50 or older (including a $1,100 catch-up contribution)
   

These limits apply to the combined total of all your IRAs, both Roth and traditional, in a given tax year. You have until the federal tax filing deadline (April 15, 2027 for the 2026 tax year) to make contributions counted toward 2026.

Income limits (phase-out ranges)

Roth IRA eligibility phases out based on modified adjusted gross income (MAGI):

Between the two MAGI thresholds for your filing status, your contribution limit is reduced (phased out) proportionally. Earning above the top threshold means you can’t contribute directly to a Roth IRA.

Contributing more than the limit triggers an IRS penalty of 6% per year on the excess amount for each year it remains in the account. If you overcontribute by mistake, withdraw the excess (and any earnings on it) before the tax filing deadline to avoid the penalty.

Key benefits of a Roth IRA

The main benefits of a Roth IRA are tax-free growth potential, tax-free qualified withdrawals in retirement, and flexibility that traditional IRAs and 401(k)s don’t offer. The four biggest:

• Tax-free growth potential and qualified withdrawals. Your contributions and all investment earnings come out tax-free in retirement if you meet the requirements.
• Contributions can be withdrawn anytime. Because you’ve already paid taxes on your contributions, you can withdraw them penalty-free and tax-free at any age. This is a backstop, not an emergency fund. Every dollar pulled out loses years of potentially tax-free compounding and can’t be replaced beyond the annual contribution limit.
• No required minimum distributions during your lifetime. Unlike traditional IRAs and 401(k)s, Roth IRAs don’t force you to start withdrawing as early as age 73, so the money has the potential to keep growing tax-free as long as you want.
• A hedge against future tax rate changes. If tax rates rise over your working life (or in retirement), your Roth IRA is protected because you’ve already paid taxes on the contributions.
   

Roth IRA withdrawal rules and the 5-year rule

Roth IRA withdrawals follow 2 sets of rules: one for your contributions and one for your earnings.

Contributions (the money you put in) can be withdrawn at any time, for any reason, tax-free and penalty-free. You’ve already paid income tax on those dollars.

Earnings (investment growth) can only be withdrawn tax-free and penalty-free if both of the following are true:

• You’re at least age 59½
• The Roth IRA has been open for at least five years
   

This is known as the 5-year rule. The clock starts on January 1 of the tax year of your first Roth IRA contribution, and a separate 5-year clock applies to each Roth conversion.

Early withdrawals of earnings generally trigger income tax plus a 10% penalty, but the IRS lists several exceptions, including a first home purchase (up to $10,000), qualified higher education expenses, and disability. See IRS Publication 590-B for the full list.

Roth IRA vs. traditional IRA vs. 401(k)

A Roth IRA is funded with after-tax dollars and offers tax-free withdrawals in retirement. A traditional IRA is funded with tax-deductible dollars and is taxed when you withdraw. A 401(k) is an employer-sponsored retirement plan with a much higher contribution limit and often an employer match.

Roth vs. traditional IRA: Same contribution limits, but opposite tax treatment. Traditional IRAs also have RMDs starting as early as age 73, while Roth IRAs do not. For the full side-by-side, see our Roth IRA vs. traditional IRA comparison.

Roth IRA vs. 401(k): You can have both, and many people do. A common strategy is to contribute up to the employer match (it’s essentially free money) for your 401 (k), then fund a Roth IRA up to its annual limit. If you have more funds to invest for long-term growth, you can consider contributing more to your 401(k). The goal of maxing out a Roth or traditional IRA is worth it whenever cash flow allows.

How to open a Roth IRA

Opening a Roth IRA takes about 15 minutes at most brokerages or investing apps. Five steps:

1. Confirm you’re eligible. You need earned income (wages, salary, self-employment), and your MAGI must be within the limits above.
2. Choose a provider. Most major brokerages, robo-advisors, and investing apps offer Roth IRAs. Look for low fees, a good mobile experience, and features that match your goals (auto-investing, IRA matching, educational resources).
3. Open and fund the account. You’ll need your Social Security number, employment info, and bank account details for funding. Most providers let you open an account in under 15 minutes.
4. Choose your investments. A Roth IRA is a wrapper; the real decision is what to invest in. Many people start with a diversified portfolio of ETFs or a target-date fund matched to their retirement year.
5. Set up recurring contributions. Automating your contributions is the single most effective way to actually max out your Roth IRA. $625/month hits the $7,500 annual limit.
    

Does Acorns offer a Roth IRA?

Yes. Acorns Later lets you open a Roth IRA (or Traditional or SEP IRA) directly in the Acorns app, with automated recurring contributions and expert-built ETF portfolios. Accounts are SIPC-protected up to $500,000, and the IRA Custodian and Administrator is Forge Trust.

The feature that sets Acorns apart is Acorns Later Match: An IRA contribution match during your first year as a Silver or Gold subscriber. Silver subscribers can get a 1% match on new contributions, and Gold subscribers get a 3% match. Maxing out your 2026 contribution at the Gold level gets you an extra $225 on top of your $7,500, money that otherwise wouldn’t exist.

The match only applies during your first subscription year and requires keeping matched funds in the Later account for 4 years, also known as a holding period.

Open a Roth IRA with Acorns Later.

Frequently asked questions

What is the difference between a Roth IRA and a traditional IRA?

The main difference is when you pay taxes. Roth IRA contributions are made with after-tax dollars, meaning you pay income tax now and withdraw tax-free in retirement. Traditional IRA contributions are typically tax-deductible, meaning you pay no tax now but pay income tax on withdrawals in retirement. For the full side-by-side comparison, see our guide to the difference between a Roth IRA and a traditional IRA.

What is the interest rate on a Roth IRA?

A Roth IRA itself doesn’t have an interest rate. It’s an account that holds investments and your returns depend on how those investments perform over time. While past performance can’t predict future performance, the market has historically returned between 7-10% over the long-term.

What is a backdoor Roth IRA?

A backdoor Roth IRA is a strategy used by high earners whose income exceeds the Roth IRA contribution limits. You make a non-deductible contribution to a traditional IRA, then convert it to a Roth IRA. Because there’s no income limit on Roth conversions, this lets you contribute indirectly. Taxes, if applicable, will be due in the current tax year on the conversion. The mechanics are legal but have tax implications (especially if you have existing pre-tax traditional IRA balances, due to the pro-rata rule), so it’s worth consulting a qualified tax professional before attempting one.

Can I open a Roth IRA at any age?

There’s no age limit to open a Roth IRA, but you (or the account holder) must have earned income to contribute. Kids with earned income from a job can have a custodial Roth IRA opened on their behalf by a parent or guardian. It’s a powerful way to give a young earner decades of tax-free compound growth potential. There’s no maximum age either. You can contribute as long as you have earned income.

Can I withdraw money from my Roth IRA before retirement?

Yes, you can withdraw your contributions (the money you’ve put in) at any time without taxes or penalties because you’ve already paid income tax on those dollars. However, withdrawing earnings before age 59½ may trigger income tax plus a 10% early withdrawal penalty unless you qualify for an exception (first-home purchase up to $10,000, qualified education expenses, disability, and a few others). Even contribution withdrawals come with a cost. Every dollar pulled out loses years of potential tax-free compounding and can’t be replaced beyond the annual contribution limit.

Is a Roth IRA worth it?

For most people with earned income, especially those in lower tax brackets now than they expect to be in retirement, yes. If you expect to be in a meaningfully lower tax bracket in retirement than you are today, a traditional IRA’s upfront deduction may serve you better. If your employer offers a 401(k) match you’re not yet capturing, consider prioritizing that first since the match is free money.