How Money Grows Inside a Roth IRA

Roth IRAs don't earn interest the way a savings account does, but the money you put in them does grow

A Roth IRA is a container, not an investment. The account itself doesn't earn interest. Instead, you choose what to put inside it — stocks, bonds, mutual funds, or even a money market fund — and those holdings are what actually grow. The Roth IRA wrapper gives you the tax benefit: your money grows tax-free, and you don't pay taxes when you withdraw it in retirement.

Think of it like a jar. The jar doesn't make the money multiply. But anything you put in the jar grows without the government taking a cut along the way. That's the Roth advantage. If you put $7,000 into a Roth IRA and do nothing else, that $7,000 just sits there. It doesn't become $7,100 on its own. You have to choose an investment — a stock fund, a bond fund, a CD — and that investment is what produces the return.

Key Takeaways

• A Roth IRA itself earns no interest; you must choose what investments go inside it, and those investments produce the growth.
• Common Roth IRA investments include stock mutual funds, bond funds, index funds, individual stocks, and money market funds.
• The tax-free growth is the Roth benefit — any gains, dividends, or interest your investments earn are not taxed while the money stays in the account.
• If you want may provide interest, you can hold a CD or high-yield savings vehicle inside your Roth IRA, though rates and terms vary by provider.

What investments can go inside a Roth IRA

Your brokerage or bank — the institution that holds your Roth IRA — offers a menu of investments you can buy with your contributions. Most large brokerages offer thousands of mutual funds, index funds, ETFs, and individual stocks. Some banks offer CDs (certificates of deposit) inside a Roth IRA, which do pay a fixed interest rate for a set term.

The investments available depend on where you open your Roth IRA. Vanguard, Fidelity, and Charles Schwab each offer different fund lineups. A bank might offer only CDs and money market funds. A discount brokerage might offer stocks and funds but no CDs. Before you open an account, check what investment options the provider actually has. If you want broad stock market exposure through a low-cost index fund, make sure that provider offers one.

You can also hold cash in your Roth IRA and not invest it at all. That cash earns nothing, but it's there if you want to buy something later. Many people contribute to a Roth IRA, let the money sit for a few days or weeks, then buy an investment once they've decided what they want.

How tax-free growth works in a Roth IRA

Suppose you put $7,000 into a Roth IRA and buy a stock mutual fund. Over 30 years, that fund grows to $50,000. In a regular taxable brokerage account, you would owe taxes on the $43,000 gain — either when you sell the fund or, depending on the fund type, on dividends and distributions along the way. In a Roth IRA, you owe zero taxes on that $43,000 gain. You can withdraw the full $50,000 tax-free in retirement.

That tax-free growth compounds over time. If your investments earn 7% per year on average, and you never pay taxes on those gains, the money grows faster than it would in a taxable account where taxes chip away at your returns each year. The longer the money stays in the Roth IRA, the bigger the advantage.

This is why a Roth IRA is most powerful when you open it young. A 25-year-old who contributes $7,000 per year for 40 years until age 65 will have far more money than a 45-year-old who starts then, even if both invest in the same funds and earn the same returns. Time and tax-free compounding are the engine.

CDs and money market funds inside a Roth IRA

If you want may provide interest rather than market-dependent returns, you can hold a CD inside your Roth IRA. A CD is a fixed-term deposit: you give the bank money for a set period (3 months, 1 year, 5 years), and the bank pays you a fixed interest rate. When the term ends, you get your principal plus interest back.

The interest rate on a CD varies by bank and by term length. A 1-year CD might pay 4.5% at one bank and 4.8% at another. A 5-year CD typically pays more than a 1-year CD. You can search CD rates on sites that compare banks, but you'll need to check directly with the bank or brokerage that holds your Roth IRA to see what rates they offer for Roth CDs specifically.

Some Roth IRA providers also offer money market funds, which hold short-term bonds and pay interest that fluctuates with market rates. These are less risky than stock funds but typically pay less over long periods. Money market funds are useful if you're saving for a near-term goal within your Roth IRA or if you want to park cash temporarily while you decide on a longer-term investment.

Why most people don't use Roth IRAs for interest-bearing accounts

A Roth IRA has an annual contribution limit — $7,000 for 2024 if you're under 50, and $8,000 if you're 50 or older. Because the limit is modest and the account is meant for long-term retirement savings, most people use it to buy growth-oriented investments like stock funds rather than interest-bearing CDs. A CD inside a Roth IRA ties up your contribution room for a year or more at a modest interest rate, when you could use that same room to buy a stock fund that historically returns more over decades.

That said, some people do use Roth IRAs for CDs, especially if they're older and closer to retirement, or if they want a portion of their retirement savings in something may provide. There's no rule against it. The trade-off is lower long-term growth in exchange for certainty and safety.

Common mistakes when choosing Roth IRA investments

One mistake is opening a Roth IRA and leaving the money in cash because you're unsure what to invest in. Cash in a Roth IRA earns nothing and misses years of potential growth. If you're not sure, a straightforward target-date fund (a fund that automatically shifts from stocks to bonds as you approach retirement) or a broad stock index fund is a reasonable starting point for most people.

Another mistake is thinking the Roth IRA itself is an investment. It's not. You still have to pick what goes inside. Some people open a Roth IRA, contribute money, and then don't realize they need to actually buy something with that money. The contribution sits idle until they take action.

A third mistake is choosing investments based on what a friend or family member chose, without considering your own time horizon and risk tolerance. A 30-year-old and a 60-year-old should probably invest differently inside their Roth IRAs, even though they're using the same account type. The younger person has time to recover from market downturns; the older person does not.

Frequently Asked Questions

Can I move money between different investments inside my Roth IRA without paying taxes?

Yes. Selling one investment and buying another inside your Roth IRA does not trigger any taxes or penalties, even if you sell at a gain. The tax-free treatment applies to all transactions within the account. You can trade as often as you want without tax consequences. The only limit is the annual contribution cap — you can't add more than $7,000 per year (or $8,000 if you're 50+), but moving money between existing investments is unlimited.

What happens if my Roth IRA investment loses money?

You don't owe taxes on losses, and you can't deduct them from your other income. If you buy a stock fund for $7,000 and it drops to $5,000, you've lost $2,000, but the IRS doesn't care. The loss stays inside the Roth IRA. If the fund recovers to $8,000 later, that $3,000 gain is tax-free. The downside is that losses in a Roth IRA don't help your taxes the way losses in a taxable account can.

Do I have to choose an investment when I open a Roth IRA?

No. You can open a Roth IRA and contribute money without when ready choosing an investment. The money can sit in cash for days or weeks while you decide. However, cash earns nothing, so the sooner you choose an investment, the sooner your money can start growing. Most people choose an investment within a few days of opening the account.

Is a Roth IRA safer than investing in the stock market?

A Roth IRA is a tax structure, not a safety feature. If you put stock funds inside a Roth IRA, you're still exposed to stock market risk. If you put a CD inside a Roth IRA, it's as safe as any CD — the bank guarantees your principal and interest. The Roth IRA itself doesn't make any investment safer or riskier. It just means the growth is tax-free.

Can I withdraw my investment gains early from a Roth IRA?

You can withdraw contributions (the money you put in) at any time without penalty. Withdrawing earnings (the growth) before age 59½ typically triggers a 10% penalty and income taxes, unless you meet a narrow exception like a first-time home purchase (up to $10,000 lifetime) or a may have access to disability. The Roth IRA rules are complex here, so check the specific rules before you withdraw.