A custodial account for stocks is a brokerage account an adult opens and manages for a child who is too young to hold one on their own. The child is the legal owner of the shares, dividends, and cash inside it. The adult, called the custodian, makes every buy, sell, and withdrawal decision until the child reaches a transfer age set by state law. Every deposit is an irrevocable gift, and once the child reaches that age, the account becomes theirs outright.
UGMA and UTMA Accounts
These accounts exist under one of two model state laws: the Uniform Gifts to Minors Act or the Uniform Transfers to Minors Act. Both let an adult transfer property to a child without setting up a formal trust, and both treat every contribution as an irrevocable gift, meaning the donor permanently gives up ownership and cannot reclaim the money later.1Cornell Law School Legal Information Institute (LII). Uniform Gifts to Minors Act (UGMA)
The practical difference is what the account can hold. UGMA accounts are limited to financial assets like stocks, bonds, and mutual funds. UTMA accounts can hold those plus a wider range of property, including real estate.1Cornell Law School Legal Information Institute (LII). Uniform Gifts to Minors Act (UGMA) For a stock-focused account the distinction rarely matters, but most brokerages default to the UTMA structure because it leaves more room to add other assets later.
One boundary worth knowing up front: the beneficiary cannot be changed. Unlike a 529 plan, where you can swap in a sibling, a UGMA or UTMA is permanently tied to the child it was opened for. A second child needs a separate account.
Contributions and the Gift Tax
Anyone can put money into a child’s custodial account, not just the custodian. Grandparents, aunts, uncles, and family friends can all deposit cash or transfer securities. Every contribution counts as a completed gift for federal tax purposes.
For 2026, the annual gift tax exclusion is $19,000 per donor, per recipient.2Internal Revenue Service. What’s New – Estate and Gift Tax A married couple can combine exclusions and give up to $38,000 to one child’s account without any gift tax paperwork. Anything within that limit needs no filing.
A donor who exceeds $19,000 in gifts to one child during the year must file Form 709 to report the overage.3Internal Revenue Service. Instructions for Form 709 Filing doesn’t automatically mean owing tax. The excess counts against the donor’s lifetime exclusion, which for 2026 is $15,000,000.2Internal Revenue Service. What’s New – Estate and Gift Tax Few people ever exhaust that, but the report is still required.
Cost basis is easy to overlook. When someone gifts stock into the account, the child inherits the donor’s original purchase price. If a grandparent bought shares at $10 and gifts them when they’re worth $50, the child’s taxable gain on a future sale is measured from $10, not $50.
How the Income Inside Is Taxed
Dividends, interest, and capital gains inside a custodial account are reported under the child’s Social Security number. The IRS limits how much of that income gets the child’s lower rate. Internal Revenue Code Section 1(g), known as the kiddie tax, pushes unearned income above a set threshold up to the parent’s marginal rate.4Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
For 2026, the first $1,350 of a child’s unearned income is covered by the dependent’s standard deduction and isn’t taxed. The next $1,350, up to $2,700, is taxed at the child’s own rate, usually the lowest bracket. Everything above $2,700 is taxed at the parent’s marginal rate.
Once unearned income passes $2,700, the custodian files Form 8615 with the child’s return to calculate the tax.5Internal Revenue Service. Topic No. 553, Tax on a Child’s Investment and Other Unearned Income (Kiddie Tax) Skipping it can lead to penalties and interest.
Small accounts have a shortcut. If the child’s total gross income is under $13,500 and consists only of interest, dividends, and capital gain distributions, the parent can report it on their own return using Form 8814.5Internal Revenue Service. Topic No. 553, Tax on a Child’s Investment and Other Unearned Income (Kiddie Tax) That avoids a separate return, but it raises the parent’s adjusted gross income, which can affect other deductions.
Who the Kiddie Tax Applies To
The rule doesn’t stop at 18. It applies to any child under 18 at year end regardless of other income. It applies at age 18 if earned income didn’t cover more than half the child’s support. And it applies from ages 19 through 23 if the child is a full-time student and earned income didn’t cover more than half of their support.4Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed A 20-year-old college student with a part-time job and a dividend-heavy account can still see that income taxed at a parent’s rate.
Opening and Funding the Account
Federal rules require the brokerage to verify identity for both the adult and the child.6FFIEC BSA/AML Manual. Assessing Compliance with BSA Regulatory Requirements – Customer Identification Program For the child, you’ll need full legal name, date of birth, and Social Security number, which becomes the primary tax identifier on the account because the child is the legal owner. For the custodian, you’ll need name, address, date of birth, and a government-issued ID number such as a driver’s license or passport.
Most major brokerages have an online application specifically for UGMA or UTMA accounts. During setup, you’ll pick which state’s law governs the account, which sets the age at which the child takes control. Naming a successor custodian at this stage matters: if the original custodian dies or becomes incapacitated without one, a court or state law decides who takes over.
Funding usually starts with an electronic transfer from a linked bank account. After the cash settles, typically one to three business days, the custodian buys stock the same way as in any brokerage account: ticker symbol, share quantity, order confirmation. The shares are registered in the child’s name under the custodian’s management. You can also move existing shares in from another brokerage through an in-kind transfer. The transfer is still a completed gift, and the child still picks up the donor’s original cost basis.
Rules for Spending From the Account
The custodian can withdraw at any time, but every dollar must be spent for the child’s benefit. That’s the core fiduciary duty of running a custodial account. Education, extracurriculars, a first car, and summer camp all fit comfortably.
The risky area is using the funds for what a parent is already legally required to provide. Every state requires parents to furnish basic necessities like food, shelter, and clothing. Spending the child’s money to cover those can be treated as a breach of fiduciary duty, and it can also create tax consequences for the custodian.
The IRS doesn’t ask for receipts on each withdrawal, but keeping records is smart. If the child or another family member later questions how funds were used, documentation tying each withdrawal to a specific benefit for the child is the strongest defense.
Effect on College Financial Aid
Because the money legally belongs to the child, the FAFSA treats it as a student asset. Student assets are assessed at 20%, so a $50,000 custodial account can cut financial aid eligibility by roughly $10,000.
A parent-owned 529 plan is assessed at a maximum rate of 5.64%. The same $50,000 in a 529 would reduce aid eligibility by about $2,820. Families saving specifically for college often prefer a 529 for that reason. Custodial accounts make more sense when the money might be used for something other than higher education, since 529 plans penalize non-qualified withdrawals.
When the Child Takes Control
The custodian’s authority ends when the beneficiary reaches the transfer age under their state’s version of UTMA or UGMA. In most states the default is 21, but the range runs from 18 up to 25 or even 30 depending on the state and how the account was set up.7Social Security Administration. POMS SI SEA01120.205 – The Legal Age of Majority for Uniform Transfer to Minors Act (UTMA) The type of transfer matters too. In several states an irrevocable gift triggers a transfer age of 21, while other transfer types default to 18.
At that point the custodian has to hand over the account. Most brokerages handle it with a change-of-ownership form that re-registers the account as a standard individual brokerage account in the former minor’s name. From then on the young adult can sell, hold, withdraw, or reinvest as they choose, with no oversight from the former custodian.
A custodian who refuses or delays without justification can be sued for breach of fiduciary duty. There is no discretion built into the transfer age. If handing a large sum to a young adult with no strings is a concern, a trust is a different vehicle with different rules; a custodial account is not the place to build in restrictions.