The Age Requirement to Invest in Stocks in the US: What You Need to Know

Want to start investing as a teenager but not sure if you can? Here’s the straight answer: If you’re under 18 and trying to open a brokerage account solo, you’re out of luck. The legal minimum age to independently manage your own investment account is 18 years old in the US. But—and this is important—there’s a workaround. Minors can absolutely start investing if they have the right account setup and an adult partner backing them up.

Why Starting Young Actually Matters

The data is simple but powerful: Begin investing at 15 versus 25, and the difference in your final portfolio is staggering. This isn’t just motivational talk—it’s pure math. The earlier you start, the longer compound returns work in your favor. A $1,000 investment at age 14 earning 4% annually becomes $1,081.60 after just two years. After 50 years, that same $1,000 could grow to roughly $18,000. That’s the magic of compounding—your money makes money, and then that new money makes money too.

Beyond the numbers, young investors develop habits that stick. When you learn to save and invest as a teenager, you’re building a financial mindset that will pay dividends your entire adult life.

Account Types Available for Minors in the US

Here’s where the flexibility comes in. While minors can’t open accounts independently, they have several options:

Joint Brokerage Accounts: The Flexible Route

A joint brokerage account is shared between a minor and an adult—usually a parent, but technically any trusted adult. Both parties own the investments, and both can make decisions (though in practice, adults typically guide the choices).

Key advantage: These accounts offer maximum flexibility. You can invest in stocks, ETFs, mutual funds, or just about anything a standard brokerage offers. There’s no theoretical minimum age—though brokers usually set practical limits. An adult could open one for a newborn and gradually let the teenager take over decisions as they mature.

Tax consideration: The adult is responsible for reporting capital gains taxes, which vary based on your federal tax bracket and holding period.

Most major brokers offer joint accounts, and many investing apps designed for teens facilitate this setup easily.

Custodial Accounts: The Protected Approach

A custodian (typically a parent) opens and manages this account, but the minor actually owns all assets inside. Here’s the critical distinction: The adult makes investment decisions, though they can certainly involve the minor in the process.

When the minor reaches the age of majority—usually 18 or 21, depending on the state—they gain full control of the account.

Tax benefits: Custodial accounts offer a tax advantage called the “kiddie tax.” A certain amount of unearned income is shielded from taxation annually, while another portion is taxed at the child’s (typically lower) tax rate. Income exceeding these limits gets taxed at the parent’s rate.

There are two main types:

UGMA (Uniform Gifts to Minors Act): Holds financial assets only—stocks, bonds, mutual funds, ETFs, and insurance products. Adopted in all 50 states.

UTMA (Uniform Transfers to Minors Act): Can hold financial assets plus any property, including real estate and vehicles. Adopted in 48 states (South Carolina and Vermont are exceptions).

Both types typically restrict high-risk strategies like options trading or margin trading.

Custodial Roth IRAs: The Tax-Free Growth Option

Got a summer job or babysitting income? You’ve got “earned income” in the IRS’s eyes. In 2023, you can contribute the lesser of your actual earnings or $6,500 annually to a custodial IRA.

Why Roth is attractive for teens: Traditional IRAs use pre-tax dollars today (you pay taxes later). Roth IRAs use after-tax dollars today (growth is tax-free forever). Since teenagers typically have low tax brackets, locking in tax-free growth through a Roth IRA is a smart move. Decades of compounding returns at zero tax rates is a powerful advantage.

The catch: Early withdrawals of earnings before age 59½ incur penalties (though exceptions exist for disability, death, and qualified education expenses).

Education-Focused Accounts

529 Plans: Designed specifically for education expenses. Funds grow tax-free when used for qualified expenses like tuition, fees, room and board, or even K-12 costs and trade schools. Any adult can open one for a minor.

Education Savings Accounts (ESAs/Coverdell): Similar to 529s but with lower contribution limits ($2,000/year per student). Funds must be used for qualified education expenses before age 30.

What Investments Make Sense for Young Investors

Since you likely have 40+ years until retirement, aggressive growth-oriented investments make more sense than conservative bonds.

Individual Stocks

Buying individual stocks means owning a tiny slice of a company. If the company thrives, your stock appreciates. The downside? Company struggles mean stock declines. The appeal for young investors: You’re not passively watching money grow. You research companies, follow news, and understand what you own.

Mutual Funds

A mutual fund pools money from thousands of investors to buy hundreds or thousands of securities simultaneously. Investing $1,000 in one stock means all your eggs are in one basket. Investing $1,000 in a mutual fund spreads that risk across dozens or hundreds of companies. If one holding drops 20%, it barely dents your overall investment.

Trade-off: You typically pay annual fees that come directly from the fund’s performance, so compare options carefully.

Exchange-Traded Funds (ETFs) and Index Funds

ETFs trade like stocks throughout the day, while mutual funds settle once daily after market close. The real difference: Most ETFs are passively managed “index funds” that track a collection of securities by predetermined rules. Since index funds don’t require active managers making constant buy-sell decisions, they’re cheaper than actively managed funds and often outperform them.

For teenagers wanting to invest $1,000 across a diversified basket of stocks, bonds, and other assets, index-based ETFs are an excellent choice.

The Compounding Effect: Real Numbers

Let’s make this concrete. Invest $1,000 in an account earning 4% annually:

• After Year 1: $1,040 (you earned $40)
• After Year 2: $1,081.60 (you earned $41.60 on the original $1,000 plus the $40 from year one)

That $1.60 difference seems small, but extend this 50 years—you’re looking at transformational growth.

More importantly, you’re building a lifelong habit. Once you’re an adult, investing becomes non-negotiable—as essential as paying rent or buying groceries. The earlier you internalize this, the wealthier you’ll be.

The Bottom Line on Age and Investing in the US

You must be 18 to open and manage your own brokerage account, IRA, or similar investment vehicle independently. However, if you’re under 18, you can:

• Open a joint brokerage account with a parent or guardian
• Have a custodial account opened in your name (managed by an adult)
• Contribute to a custodial Roth IRA if you have earned income
• Benefit from education savings vehicles like 529 plans

The minimum age for these accounts varies by provider, but most accept minors from early teen years onward. More importantly, you can actually own the investments and—depending on the account type—have real input on investment decisions.

The clock is ticking. Start now, let compounding work its magic, and thank yourself in 30 years.