The investments you choose depend on your time horizon and risk tolerance, not the account type

A Roth IRA is a container — it holds investments, but it is not itself an investment. You must choose what goes inside it. The most common options are mutual funds, exchange-traded funds (ETFs), individual stocks, and bonds. Some people also hold certificates of deposit (CDs) or money market funds for the most conservative portion. Your brokerage (Fidelity, Vanguard, Charles Schwab, and others) will let you buy most of these from within your Roth account.

The decision is not about maximizing tax shelter — that is automatic in a Roth. The decision is about what mix of risk and return fits your situation. Someone 35 years old with 30 years until retirement can afford more volatility than someone 60 years old with 5 years left. The Roth wrapper does not change that math.

Key Takeaways

  • Mutual funds and ETFs that track broad market indexes (like the S&P 500 or total stock market) are the most common choice for long-term Roth investors because they offer instant diversification and low fees.
  • Individual stocks carry higher risk and require more research, but some people hold a small portion of their Roth in individual companies they understand.
  • Bonds and bond funds are more stable but offer lower returns; they are often used for the portion of your portfolio you want to protect from short-term swings.
  • Your brokerage charges different fees depending on what you buy, so comparing expense ratios on funds and commission structures matters over decades.
  • Target-date funds automatically shift from stocks to bonds as you approach retirement, removing the need to rebalance yourself.

Index funds and ETFs: the default choice for most people

An index fund or ETF that tracks a broad market index is where most Roth investors start. These funds hold hundreds or thousands of stocks in a single purchase, so you own a slice of the entire market (or a large portion of it) with one transaction. The most popular are funds tracking the S&P 500 (500 large U.S. companies), the total U.S. stock market, or international stocks.

The advantage is simplicity and low cost. A fund tracking the S&P 500 might charge 0.03% per year in fees — meaning you pay $3 annually on a $10,000 investment. You do not have to pick individual companies or rebalance constantly. Over 30 years, this low-cost approach compounds significantly.

The difference between a mutual fund and an ETF is mostly technical: ETFs trade like stocks during market hours, while mutual funds settle at the end of the day. For a Roth IRA held long-term, this difference matters very little. Both are available at every major brokerage. Vanguard's VTSAX (mutual fund) and VTI (ETF) both track the total U.S. stock market and charge nearly identical fees.

Individual stocks: higher risk, higher attention required

You can hold individual company stocks inside a Roth IRA. Some people dedicate a small portion — 5% to 20% — to stocks they research and believe in, while keeping the rest in index funds. This approach lets you take a concentrated bet without the tax consequences that would apply in a taxable account.

The trade-off is time and risk. Picking individual stocks requires reading financial statements, understanding the business, and monitoring news. A single company can lose 50% of its value or more. If you do not have the time or interest, index funds remove this burden entirely.

Some people use individual stocks as a learning tool within a Roth — a way to practice stock picking with money that will not trigger capital gains taxes when they sell at a loss or profit. Others never touch individual stocks and do just fine with funds alone.

Bonds and bond funds for stability and income

A bond is a loan you make to a government or company. They pay you interest over time and return your principal at maturity. Bond funds hold many bonds, so you get diversification and do not have to wait for maturity to access your money.

Bonds are less volatile than stocks — they do not swing 20% in a year — but they also return less over long periods. A bond fund might return 3% to 5% annually, while a stock fund might return 8% to 10% (though with bigger ups and downs). Younger investors often hold mostly stocks and a small bond allocation. Older investors often flip this, holding mostly bonds and some stocks for growth.

The most common bond choice for a Roth is a fund tracking the total bond market or U.S. Treasury bonds. These are stable and widely available. Some people also use bond funds as a "safe" portion they can tap if they need money in an emergency, though withdrawals from a Roth have their own rules.

Target-date funds: automatic rebalancing as you age

A target-date fund is a single fund that holds a mix of stocks and bonds, and it automatically shifts the mix over time. You pick the fund based on your expected retirement year — for example, "Target Date 2055" if you plan to retire around 2055. The fund starts with a high stock percentage (say, 85% stocks, 15% bonds) and gradually moves toward bonds as 2055 approaches.

This removes the need to rebalance yourself or decide when to shift from aggressive to conservative. The fund manager handles it. Target-date funds are available at every major brokerage and are often the default choice in employer 401(k) plans. They work just as well in a Roth IRA.

The downside is less control — you cannot customize the exact mix — and slightly higher fees than a bare-bones index fund. But for someone who wants a simple, set-it-and-forget-it approach, a target-date fund is a solid choice.

CDs and money market funds: the conservative option

You can hold a CD (certificate of deposit) or money market fund inside a Roth IRA. These are the safest options: CDs are FDIC-insured up to $250,000, and money market funds hold short-term government and corporate debt. They pay a fixed rate of interest, currently ranging from 4% to 5% depending on the CD term and the bank.

The trade-off is that these returns are lower than stocks or even bonds over long periods. Someone 30 years from retirement who holds only CDs will likely end up with less purchasing power than someone who held stocks, because inflation will erode the value of that fixed interest rate. CDs and money market funds work best as a small, stable portion of a larger portfolio, or for someone very close to retirement who cannot afford volatility.

How to compare costs across brokerages

Different brokerages charge different fees for the same investments. Fidelity, Vanguard, and Charles Schwab all offer low-cost index funds, but the exact funds and their expense ratios vary slightly. Before opening a Roth IRA, check what funds each brokerage offers and what they charge.

Look at the expense ratio — the annual percentage fee — not the account opening fee (most brokerages charge zero). A fund with a 0.05% expense ratio costs half as much as one with a 0.10% ratio. Over 30 years, this difference compounds into thousands of dollars. Vanguard and Fidelity are known for low-cost index funds; some other brokerages charge more.

You can also compare by looking at the fund's prospectus or fact sheet, both available on the brokerage website. The expense ratio is always listed. If a brokerage charges significantly more than competitors for the same fund, that is a signal to look elsewhere.

Frequently Asked Questions

Can I change what I invest in after I open the Roth?

Yes. You can buy and sell investments inside your Roth IRA without triggering taxes or penalties. You can shift from stocks to bonds, sell one fund and buy another, or move between individual stocks and funds. The tax shelter applies to all of it. The only limit is that you cannot add more than the annual contribution limit ($7,000 in 2024, varying by year) to the account itself.

Should I pick one fund or spread across multiple?

One broad index fund is enough. A single total stock market fund gives you exposure to thousands of companies. Adding more funds does not improve returns; it just adds complexity. Some people hold one stock fund and one bond fund for simplicity. More than that is usually unnecessary.

What if I want to invest in real estate or cryptocurrency inside a Roth?

Most brokerages do not offer real estate or cryptocurrency directly in a Roth IRA. You can hold real estate investment trusts (REITs), which are funds that own real estate, through a standard brokerage. Cryptocurrency requires a specialized custodian and carries additional fees and complexity. For most people, stocks and bonds are the practical options.

Is it better to invest a lump sum or add money gradually?

Historically, lump-sum investing outperforms gradual investing over long periods, because you have more money in the market longer. But if you are uncomfortable with volatility, adding money gradually (dollar-cost averaging) can feel less risky psychologically. The difference in long-term returns is usually small. Pick whichever approach you will actually stick with.

How often should I rebalance my Roth?

Once a year is typical. If you hold 70% stocks and 30% bonds, and stocks rise so you end up at 75% stocks, you can rebalance back to 70% by selling some stocks and buying bonds. This keeps your risk level consistent. If you hold a single target-date fund, rebalancing happens automatically.