Custodial Brokerage Accounts for Kids
Custodial accounts are the simplest way to invest for a kid in ETFs — but the money becomes legally theirs at adulthood, and that single fact shapes every decision around them.
Don't have time? Here's what you need to know:
- 1A custodial account (UGMA/UTMA) lets an adult invest for a minor in broad assets like ETFs, with no earned-income requirement.
- 2Contributions are irrevocable gifts — the money is legally the child's and transfers to their full control at the age of majority.
- 3Taxes follow 'kiddie tax' rules, and the account counts as the student's asset on the FAFSA, which can reduce financial aid.
- 4For education-specific goals with retained control, a 529 plan usually fits better; many families use both.
What a Custodial Account Is (UGMA and UTMA)
A custodial brokerage account lets an adult — usually a parent — invest on behalf of a minor. It's created under one of two state laws: the Uniform Gifts to Minors Act (UGMA) or the Uniform Transfers to Minors Act (UTMA). UTMA is broader and more common today, allowing a wider range of assets. The adult acts as custodian, managing the investments until the child reaches the age at which the account transfers to them.
Inside the account you can hold ordinary investments, including broad ETFs like VTI or VOO, making it a straightforward way to start a child's long-term portfolio. There's no contribution limit set by the IRS in the way a retirement account has, and there's no requirement that the child have earned income — which distinguishes a custodial brokerage account from a custodial Roth IRA.
The Catch: It's the Child's Money — Permanently
The single most important fact about a custodial account is that contributions are irrevocable gifts. Once money goes in, it legally belongs to the child. The custodian must manage it for the child's benefit and cannot take it back or redirect it to another kid or to themselves. This is very different from a 529 plan, where the account owner keeps control and can change the beneficiary.
It also means that when the child reaches the age of majority — which varies by state, commonly somewhere between 18 and 21, and later in a few states — full control passes to them. At that point they can do whatever they want with the balance, whether that's tuition or a sports car. For families uncomfortable handing a young adult a large lump sum with no strings, that loss of control is the main drawback to weigh.
Important: Custodial-account money becomes the child's to control at the age of majority, with no spending restrictions. If you need control over how funds are used — for education specifically, for example — a 529 plan or trust may fit better.
Taxes and Financial Aid: The Kiddie Tax and FAFSA
Custodial accounts have their own tax treatment. Investment income is taxed under the 'kiddie tax' rules: a first slice of a child's unearned income is tax-free, the next slice is taxed at the child's rate, and amounts above a threshold are taxed at the parents' rate. The exact thresholds adjust over time, so the headline is the structure, not a fixed number — modest amounts get favorable treatment, larger amounts don't escape tax.
For college planning, be aware that custodial accounts count as the student's asset on the FAFSA, and student assets are assessed more heavily than parental assets when calculating financial-aid eligibility. A 529 plan owned by a parent is generally treated more favorably. If maximizing need-based aid is a priority, that distinction can matter more than the tax difference.
| Custodial (UGMA/UTMA) | 529 Plan | |
|---|---|---|
| Owner of assets | The child | The account owner (e.g. parent) |
| Control at adulthood | Transfers to child | Stays with owner |
| Use of funds | Any purpose | Education (for tax benefit) |
| Investment choice | Broad (any ETF/stock) | Plan menu |
| FAFSA treatment | Student asset (heavier) | Parent asset (lighter) |
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When a Custodial Account Makes Sense
A custodial account fits when you want maximum flexibility in how the money can eventually be used — not just education — and you're comfortable with the child taking control as an adult. The broad investment menu is a real advantage: you can build a simple, diversified ETF portfolio with low expense ratios rather than being confined to a plan's preset options.
If the goal is specifically college and you want to keep control and protect financial-aid eligibility, a 529 plan is usually the better tool. Many families use both — a 529 for education with its tax advantages and aid treatment, and a custodial account for general-purpose savings or to teach an older teen about investing. The right choice depends on what you're optimizing for: flexibility, control, taxes, or aid.
Tip: Consider using a custodial account as a teaching tool: as your child gets older, walk them through the ETFs they own and how the account has grown. It turns an abstract gift into a real lesson in long-term investing.
Frequently Asked Questions
What is the difference between UGMA and UTMA?
Both are state laws that govern custodial accounts for minors. UTMA (Uniform Transfers to Minors Act) is broader and more common, allowing a wider range of assets, while UGMA (Uniform Gifts to Minors Act) is older and more limited. In practice most custodial brokerage accounts today are UTMA accounts.
When does the child get control of a custodial account?
At the age of majority for custodial accounts in your state — commonly between 18 and 21, and later in a few states. At that point the assets transfer fully to the child, who can use them for any purpose with no restrictions. The custodian's control ends.
How are custodial accounts taxed?
Under 'kiddie tax' rules: a first portion of the child's unearned investment income is tax-free, the next portion is taxed at the child's rate, and amounts above a threshold are taxed at the parents' rate. The thresholds adjust over time, so modest amounts get favorable treatment while larger ones don't escape tax.
Custodial account vs 529 plan — which is better for college?
For college specifically, a parent-owned 529 plan is usually better: it keeps control with the owner, offers tax-free growth for qualified education expenses, and is treated more favorably on the FAFSA. A custodial account offers more flexibility in how funds are used but counts as the student's asset and transfers to them at adulthood.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.