What Is a Roth IRA? Rules, Limits & How to Open One

What Is a Roth IRA?

A Roth IRA (Individual Retirement Account) is a special investment account that provides tax-free growth and tax-free withdrawals in retirement. It is named after Senator William Roth, who helped create it through the Taxpayer Relief Act of 1997.

The key feature of a Roth IRA is the tax treatment. You contribute money you have already paid taxes on (after-tax dollars). In return, every dollar of growth — dividends, interest, capital gains — is never taxed again. When you withdraw money in retirement, you pay zero federal income tax on any of it.

This is the opposite of a traditional IRA, where contributions may be tax-deductible today but withdrawals are taxed as ordinary income in retirement. The Roth trades a tax break today for tax freedom in the future.

For young investors with decades of compound growth ahead, the Roth IRA is often considered the single most powerful wealth-building tool available. Tax-free compounding for 30-40 years can save hundreds of thousands of dollars in taxes that would otherwise reduce your retirement income.

How the Roth IRA Works

The mechanics of a Roth IRA are straightforward:

1. Contribute after-tax money. You contribute money from your income that has already been taxed. Unlike a traditional IRA, you get no tax deduction for contributing.

2. Invest the contributions. Inside the Roth IRA, you can invest in stocks, bonds, index funds, ETFs, mutual funds, and other investments. There are no restrictions on what you can hold.

3. Watch it grow tax-free. All dividends, interest, and capital gains within the account compound without any tax impact. No capital gains tax when you sell a stock for profit within the Roth. No tax on dividends received within the Roth.

4. Withdraw tax-free in retirement. After age 59 1/2 and once the account has been open for at least 5 years, all withdrawals — both contributions and earnings — are completely tax-free.

Contribution Limits for 2025

The IRS sets annual limits on how much you can contribute to a Roth IRA. For the 2025 tax year:

These limits are combined across all your IRA accounts (Roth and traditional). If you contribute $3,000 to a traditional IRA, you can only contribute $4,000 to a Roth IRA in the same year.

The limits apply per person, not per account. Even if you have multiple Roth IRAs (though there is no benefit to this), your total contributions across all of them cannot exceed the annual limit.

Important: You must have earned income (wages, salary, self-employment income) at least equal to your contribution. If you earn only $5,000 in a year, your maximum contribution is $5,000, not $7,000.

For the latest limits, see our dedicated guide on Roth IRA contribution limits, which covers income phase-outs and backdoor Roth strategies.

Income Limits and Phase-Outs

Not everyone can contribute directly to a Roth IRA. The IRS imposes income limits based on your Modified Adjusted Gross Income (MAGI).

2025 income limits:

If your income falls within the phase-out range, your allowed contribution is reduced proportionally. If your income exceeds the upper limit, you cannot contribute directly — but the backdoor Roth strategy (explained in our contribution limits guide) provides a legal workaround.

Roth IRA vs Traditional IRA

Choosing between a Roth IRA and a traditional IRA is one of the most important decisions in retirement planning.

Choose the Roth IRA if:

• You are young and in a lower tax bracket now than you expect in retirement
• You want tax-free income in retirement for planning flexibility
• You want to avoid Required Minimum Distributions (RMDs)
• You expect tax rates to increase in the future

Choose the traditional IRA if:

• You are in a high tax bracket now and expect a lower one in retirement
• You need the tax deduction today to reduce current tax liability
• Your employer plan does not have a Roth option

For many investors, the answer is both. Having money in both Roth and traditional accounts gives you tax diversification — the ability to choose which account to withdraw from in retirement to minimize your tax bill.

Tax-Free Growth: The Math That Makes It Powerful

The power of the Roth IRA becomes clear when you run the numbers on tax-free versus taxable growth.

Consider $7,000 invested annually from age 25 to 65 in an index fund earning 8% average annual return:

The Roth IRA produces $587,540 more after-tax retirement income than the traditional IRA and $628,000 more than the taxable account. This difference is entirely because the Roth's growth is never taxed.

The tax savings increase even more if tax rates rise in the future, which is a reasonable expectation given current government debt levels.

Withdrawal Rules and the 5-Year Rule

Roth IRA withdrawal rules are more flexible than most retirement accounts, but there are important details to understand.

Contributions can be withdrawn anytime. Since you already paid taxes on your contributions, you can withdraw them at any time, for any reason, with no tax and no penalty. This makes the Roth IRA a useful emergency backup (though you should have a separate emergency fund first).

Earnings withdrawals have two conditions for being tax-free and penalty-free:

1. You must be at least 59 1/2 years old
2. The account must have been open for at least 5 years (the "5-year rule")

If you withdraw earnings before meeting both conditions, you may owe income tax plus a 10% early withdrawal penalty. Exceptions exist for:

• First-time home purchase (up to $10,000)
• Qualified education expenses
• Disability
• Unreimbursed medical expenses
• Health insurance premiums during unemployment

No Required Minimum Distributions

One of the Roth IRA's most underappreciated advantages is the absence of Required Minimum Distributions (RMDs). Traditional IRAs and 401(k)s force you to begin withdrawing money starting at age 73, whether you need it or not. These forced withdrawals create taxable income.

Roth IRAs have no RMDs during the account holder's lifetime. This means:

• You can let the money compound tax-free for as long as you live
• You have full control over when and how much to withdraw
• You can pass the entire Roth IRA to heirs (though they will have RMDs)
• Your Roth IRA can serve as a tax-free legacy for the next generation

The RMD advantage is particularly valuable for retirees who have sufficient income from other sources (Social Security, pensions, other accounts) and do not need to draw on their Roth IRA. Every year the money stays invested and compounding tax-free is a year of additional growth.

What to Invest In Inside Your Roth IRA

The Roth IRA is an account type, not an investment itself. Inside it, you can hold virtually any investment. The best approach depends on your age and time horizon.

For younger investors (20s-30s):

• 90-100% stocks through low-cost index funds (S&P 500, total market)
• Maximize growth potential during decades of tax-free compounding
• Can tolerate short-term volatility

For mid-career investors (40s-50s):

• 60-80% stocks, 20-40% bonds
• Begin adding stability as retirement approaches
• Consider dividend growth stocks for compounding income

For near-retirees (55+):

• 40-60% stocks, 40-60% bonds
• Focus on capital preservation and income
• Keep some growth exposure for decades of potential retirement spending

Frequently Asked Questions

Can I have both a Roth IRA and a 401(k)?

Absolutely. A Roth IRA and a 401(k) are separate accounts with separate contribution limits. In 2025, you can contribute $7,000 to a Roth IRA and $23,500 to a 401(k) (or $31,000 if 50+). If your employer offers a Roth 401(k), you can contribute to both a Roth 401(k) and a Roth IRA, maximizing your tax-free growth across both accounts.

Is it too late to start a Roth IRA at 40?

Not at all. A 40-year-old contributing $7,000 annually at 8% return would have approximately $508,000 by age 65 — all withdrawable tax-free. While starting at 25 is ideal due to compound interest, starting at 40 still provides 25 years of tax-free growth, which is enormously valuable.

What happens to my Roth IRA when I die?

Your Roth IRA passes to your designated beneficiaries tax-free. Spousal beneficiaries can treat the inherited Roth as their own and continue tax-free growth with no RMDs. Non-spousal beneficiaries must withdraw the entire balance within 10 years of inheritance, but those withdrawals are still tax-free.

Can I contribute to a Roth IRA if I have no job?

You need earned income to contribute. However, if you are married and your spouse has earned income, they can contribute to a spousal Roth IRA on your behalf even if you have no personal income. Both spouses can contribute up to the limit as long as total household earned income covers both contributions.

Should I max out my Roth IRA before investing in a taxable account?

In most cases, yes. The tax-free growth of a Roth IRA is too valuable to leave on the table. The general priority is: 1) contribute enough to your 401(k) to get the full employer match, 2) max out your Roth IRA, 3) max out the rest of your 401(k), 4) invest in a taxable brokerage account. Exceptions exist if you need the money before retirement or have specific short-term goals.