A custodial account for stocks is a brokerage account an adult opens and manages for a minor, where the child is the legal owner of every share, dollar, and dividend from the moment the account is funded. The adult, called the custodian, picks the investments and handles the paperwork, but the assets belong to the child. When the child reaches the age set by state law, control passes to them outright. Because ownership sits with the minor from day one, the account carries tax, financial aid, and control consequences that matter before you put money in, not after.
UGMA and UTMA: The Two Legal Frameworks
Custodial accounts operate under one of two state model laws. The Uniform Gifts to Minors Act (UGMA) is the older statute and covers financial assets: cash, stocks, bonds, and insurance policies. The Uniform Transfers to Minors Act (UTMA) is broader and can hold nearly anything of value, including real estate, art, and royalties alongside securities. Most states have adopted some version of UTMA, and it is the more common framework today.
Neither law requires you to draft trust documents or hire an attorney. The state statute itself is the governing agreement. It defines the custodian’s authority, the child’s ownership, and the age at which the custodianship ends. Each account names one child, and that beneficiary cannot be changed later. If you want to invest for two kids, you open two accounts.
Who Owns the Money and What the Custodian Can Do
Every contribution is an irrevocable gift. Once money or stock enters the account, it belongs to the child. You cannot pull it back later because of a divorce, financial hardship, or a falling-out. The child holds legal title even though they cannot touch the assets until the termination age.
The custodian has a fiduciary duty to manage the account solely for the child’s benefit. That shapes what you can and cannot do with the money. Investment decisions, withdrawals, and account activity must all serve the minor. Using custodial funds to remodel your own home, for instance, would violate that duty.
Withdrawals before the termination age are allowed, but only for expenses that directly benefit the child: education, medical bills, extracurricular activities, and similar needs. The account cannot cover the basic parental support a parent is already legally required to provide.
One practical detail worth handling at the outset: name a successor custodian on the application. If the original custodian dies or becomes unable to serve and no successor is on file, a court may need to appoint one, which costs time and money. Most brokerage applications include a field for this.
Gift Tax Rules for Contributions
Because contributions are gifts, federal gift tax rules apply. For 2026, a donor can give up to $19,000 per recipient per year without triggering a gift tax return.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 A married couple can combine exclusions and give up to $38,000 per child per year with no filing required. Contributions above the annual exclusion count against the donor’s lifetime gift and estate tax exemption and require filing IRS Form 709 for the year of the gift.
The account itself has no annual contribution cap. The gift tax exclusion only determines whether the donor owes tax or must file a return. Grandparents, other relatives, and family friends can each contribute up to the annual exclusion amount to the same child’s account without gift tax consequences.
How the Investment Income Is Taxed
Because the child owns the assets, the IRS taxes the account’s investment income under the child’s Social Security number. A set of rules commonly called the “kiddie tax” prevents families from parking large amounts of investment income in a child’s lower bracket. For 2026, the tiers work like this:
- The first $1,350 of unearned income is covered by the child’s standard deduction and is not taxed.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
- The next $1,350 is taxed at the child’s own rate, usually 10 percent.
- Anything above $2,700 is taxed at the parent’s marginal rate, which is often significantly higher.2Internal Revenue Service. Instructions for Form 8615
When a child’s unearned income exceeds $2,700, the child must file their own return with Form 8615 attached to calculate the tax owed at the parent’s rate.2Internal Revenue Service. Instructions for Form 8615 Unearned income includes dividends, taxable interest, and capital gains, but not wages a child earns from a job. In some cases parents can elect to report the child’s investment income on their own return, but the option is limited to situations where the child’s income consists only of interest and dividends and falls under a specific threshold. Keep thorough records of trades, dividend payments, and capital gain distributions; you will need them at tax time.
When the Child Takes Control
Every custodial account has a termination age: the birthday when the custodian must hand over full control to the beneficiary, now a legal adult. The exact age depends on the state law governing the account and the type of transfer that created it. Across all states, termination ages range from 18 to 25, with 21 being the most common default. A small number of states let the custodian elect an extended age at the time the account is opened, pushing the transfer as late as 25.
Once the beneficiary hits that age, they get unrestricted access to everything in the account. They can sell the stocks, withdraw the cash, or keep investing, and the former custodian has no legal say. That is the most important thing to understand before funding an account: there is no built-in way to stop a young adult from spending the money however they choose. If you are worried about how a child might handle a large sum at 18 or 21, a formal trust with conditions on distributions gives more control, at the cost of higher setup fees and legal complexity.
Custodial Account or 529 Plan
Custodial accounts and 529 education savings plans both help families invest for a child, but they behave very differently.
- Earnings in a 529 plan grow tax-free, and qualified education withdrawals are tax-free. Earnings in a custodial account are taxable each year under the kiddie tax rules above.
- A 529 plan hits non-education withdrawals with income tax plus a 10 percent additional federal tax on the earnings portion. A custodial account puts no restriction on what the money is used for once the child reaches the termination age.
- The owner of a 529 plan keeps control indefinitely, can change the beneficiary to another family member, and can roll funds into a Roth IRA for the beneficiary under certain conditions. A custodial account must be turned over at the termination age and cannot switch beneficiaries.
- A custodial brokerage account can hold individual stocks, bonds, ETFs, mutual funds, and other securities the custodian selects. A 529 plan limits you to the investment menus the plan offers.
- On the FAFSA, custodial accounts count as student assets and are assessed at up to 20 percent when calculating the family’s expected contribution toward college costs. Parent-owned 529 plans count as parental assets, assessed at a maximum of roughly 5.64 percent. A $50,000 custodial account could reduce aid eligibility by about $10,000; the same $50,000 in a parent-owned account would reduce it by roughly $2,820.
A custodial account fits better when the goal is flexible, general-purpose wealth building for a child. A 529 is usually the stronger choice when the money is earmarked for education and the contributor wants continuing control.
How to Open a Custodial Stock Account
Opening a custodial brokerage account requires information for both the adult and the child. For the child, you will need legal name, date of birth, and Social Security number. For the custodian, you will need Social Security number, residential address, and employment information. Financial institutions collect this data to verify identities and comply with anti-money-laundering requirements under the USA PATRIOT Act.3Financial Crimes Enforcement Network. USA PATRIOT Act
Most major brokerage firms offer custodial accounts through a dedicated section of their website. The application will route you to your state’s UGMA or UTMA statute based on the minor’s residence and prompt you to designate a successor custodian. You submit through a secure online portal with an electronic signature, and the firm typically activates the account within one to three business days.
Fund the account by linking an external bank account for an electronic transfer, sending a wire, or mailing a check. Once the funds clear, you can start buying stocks, ETFs, mutual funds, or other securities the brokerage offers. From that point forward, every investment choice has to be made with the child’s best interests in mind, and that duty lasts until the day you hand the account over.