Yes, a 16-year-old can invest in stocks, but not by opening a brokerage account alone. Because minors can legally back out of contracts, brokerages won’t let anyone under 18 sign the account agreement themselves. The standard route is a custodial account: an adult opens it, names the teen as the owner, and places the trades until the teen reaches the age set by state law. At that point, the account and everything in it becomes the young adult’s, with no conditions attached.
Why a Teen Can’t Open a Brokerage Account Alone
A brokerage account is a binding contract covering terms of service, margin disclosures, and trade execution. Minors generally have the right to walk away from contracts they sign, which makes the agreement unenforceable from the broker’s side. No firm wants to execute trades for a customer who could legally disaffirm the arrangement the next day.
There is one narrow exception. A minor who has been legally emancipated by a court may have the capacity to enter contracts, depending on state law. In practice, this is rare, and most brokerages still won’t open an account for an emancipated minor without extra documentation. For nearly every 16-year-old, the path is a custodial account.
How a Custodial Account Works
Custodial accounts are created under either the Uniform Transfers to Minors Act (UTMA) or the Uniform Gifts to Minors Act (UGMA). Nearly every state has adopted one or both. An adult, the custodian, opens a brokerage account, names the minor as the beneficial owner, and manages the investments on the minor’s behalf. UTMA accounts are more common today because they can hold a wider range of assets, not just securities and cash.1Cornell Law School. Uniform Transfers to Minors Act
Every dollar deposited into the account is an irrevocable gift to the minor. The custodian can’t pull money back out for personal use and has a fiduciary duty to invest and spend it for the minor’s benefit. Withdrawals to pay for things that directly benefit the child, like education, a car, or extracurriculars, are allowed. Using the account to reimburse the custodian’s own expenses is not.
Anyone can contribute: parents, grandparents, aunts, family friends. For 2026, each person can give up to $19,000 per recipient without filing a gift tax return.2Internal Revenue Service. Gifts and Inheritances 1 Married couples can combine exclusions for up to $38,000 per child per year.
Opening the Account
Most major online brokerages offer UTMA or UGMA accounts, and the setup takes about 15 minutes. Federal anti-money-laundering rules require the brokerage to collect the custodian’s full legal name, date of birth, residential address, Social Security number, and a government-issued photo ID.3eCFR. 31 CFR 1020.220 – Customer Identification Program Requirements for Banks For the teen, you’ll need at minimum the full legal name and Social Security number.
The custodian signs the account agreement and accepts fiduciary responsibility. Funding usually happens through an ACH transfer from the custodian’s bank; some firms accept paper checks. Minimum deposits range from $1 at some brokerages to a few hundred dollars at others. Once the account is approved, the custodian can start buying stocks, ETFs, and mutual funds immediately.
When the Teen Gets Full Control
Custodial accounts have an expiration date. Once the minor reaches the termination age set by state law, the custodian must hand over the assets. The most common termination age is 18 or 21, and a handful of states allow custodianships to run to 25.1Cornell Law School. Uniform Transfers to Minors Act
The transfer is automatic and unconditional. The young adult can liquidate the whole portfolio, spend the balance however they like, or keep investing. There’s no mechanism to delay the transfer or attach strings to how the money is used. Families who want more control over timing and distributions generally have to use a trust, which costs more to set up and maintain.
Taxes on the Earnings
Investment income in a custodial account belongs to the minor for tax purposes. That sounds like a tax advantage, since kids sit in a lower bracket, but the “kiddie tax” under Internal Revenue Code Section 1(g) limits the benefit by taxing a child’s unearned income above a threshold at the parent’s marginal rate.4Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
For 2026, the thresholds run as follows:5IRS.gov. Rev Proc 2025-32 Inflation-Adjusted Items for 2026
- The first $1,350 of unearned income is tax-free, covered by the minor’s standard deduction.
- The next $1,350, up to $2,700 total, is taxed at the child’s own rate.
- Anything above $2,700 is taxed at the parent’s marginal rate, which can reach 37%.
The kiddie tax applies to children under 19, or under 24 if they’re full-time students who don’t provide more than half of their own support. When unearned income tops $2,700, the child files a return with Form 8615 attached.6Internal Revenue Service. 2025 Instructions for Form 8615 In some cases a parent can instead report the child’s interest, dividends, and capital gain distributions on their own return using Form 8814, if the total stays under $13,500.7Internal Revenue Service. Instructions for Form 8814 (2025)
Custodial Roth IRA if the Teen Has Earned Income
If the 16-year-old has a part-time job, a summer gig, or documented self-employment income, a custodial Roth IRA is worth considering alongside or in place of a taxable custodial account. The money grows tax-free and qualified withdrawals in retirement are tax-free, so decades of compounding come with no tax drag.
The teen must have earned income reported to the IRS. Cash babysitting doesn’t count unless it’s reported as self-employment income; a W-2 job or documented self-employment income does. The annual contribution can’t exceed the lesser of the teen’s earned income or the IRA limit, which is $7,500 for 2026.8Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 A teen who earns $3,000 over the summer can contribute up to $3,000, regardless of the higher statutory cap.
A parent or grandparent can put up the contribution as long as the teen has at least that much in earned income. The dollars don’t have to come from the teen’s paycheck. A Roth IRA also isn’t counted as a student asset on the FAFSA, which makes it a more aid-friendly place to build wealth for a working teenager.
Effect on College Financial Aid
Custodial brokerage accounts can quietly cost a family thousands of dollars in aid. On the FAFSA, UTMA and UGMA accounts count as the student’s asset. The federal formula assesses student assets at up to 20% per year, compared with a maximum of roughly 5.64% for parent-held assets. A $50,000 custodial account could reduce a student’s aid by up to $10,000 per year; the same $50,000 in a parent account would cut aid by at most about $2,820.
Private colleges that use the CSS Profile often treat custodial accounts the same way, though each school applies its own formula. Money in a custodial account will hurt need-based aid more than money in the parent’s name, and because the gift is irrevocable, it can’t be moved back once it’s in. Families who expect to apply for aid sometimes spend custodial funds down on legitimate expenses for the minor before filing the FAFSA, or route earned income into a custodial Roth IRA, which is generally excluded from FAFSA assets.
What the 16-Year-Old Actually Does
The custodian places the trades, but the point of the account is to get the teen involved. Nothing stops a teenager from researching companies, reading earnings reports, and telling the custodian what to buy. The custodian just has to be the one who clicks the button.
Some brokerages offer companion apps built for teen investors, where the minor can view the portfolio, track performance, and submit trade requests for the custodian to approve. That’s about as close to independent investing as a 16-year-old can get, and it’s a meaningful head start over waiting until 18 to open a first account.