California UTMA Accounts: Custodian Duties, Taxes, and Payout Age

California’s Uniform Transfers to Minors Act, found at Probate Code sections 3900 through 3925, sets the rules for California UTMA accounts: custodial accounts that let you transfer assets to a child without creating a trust, with an adult custodian managing the property until the child reaches the transfer age.¹ Every transfer into the account is permanent, the assets legally belong to the child from day one, and both the tax treatment and the financial-aid consequences can catch families off guard.

Opening the Account and What You Can Put In

Setting up a UTMA account takes three decisions: who serves as custodian, where the account lives, and what you fund it with. Any adult other than the transferor can serve as custodian, and so can a trust company.¹ Parents often name themselves for convenience, but doing so creates an estate-tax risk covered further down.

The account is opened at a bank or brokerage in a specific format: the custodian’s name, followed by “as custodian for [child’s name] under the California Uniform Transfers to Minors Act.” Most major brokerages offer these with no annual maintenance fee, though some app-based platforms charge a monthly subscription.

California’s UTMA covers a broad range of property. You can transfer cash, publicly traded securities, life insurance and annuity contracts, real estate, titled personal property like vehicles, and essentially any other type of property through a written instrument.² Each asset type has its own registration and documentation requirements, and the transfer language must follow the statutory format to be valid.

Transfers Are Irrevocable

Once assets go into a California UTMA account, you cannot take them back. The transfer is irrevocable, and the property is legally vested in the child.¹ This is what separates a UTMA from a revocable trust or a savings account in your own name. If you transfer $50,000 in stock and later regret it, there’s no legal mechanism to reverse the gift. The child will receive whatever remains at the termination age regardless of your feelings at that point.

What the Custodian Can and Can’t Do

A custodian’s core duties are to take control of the property, invest and manage it, keep it separate from personal assets, and maintain detailed records of every transaction, including the information needed to prepare the child’s tax returns.³ A parent or the child’s legal representative can inspect the records at reasonable intervals, and the child gains that right at age 14.

Investment decisions must meet a prudent-person standard: the custodian handles the assets the way a careful person would handle someone else’s property. Uncompensated custodians, which most parent-custodians are, get some protection from liability for investment losses unless those losses stem from bad faith, intentional wrongdoing, gross negligence, or a failure to invest prudently.⁴ That protection stops at misusing funds.

Spending UTMA Funds

A custodian can spend UTMA money on anything that benefits the child, without a court order. The statute is broad: the custodian may pay out or spend as much as they consider “advisable for the use and benefit of the minor,” and they don’t need to weigh whether anyone else has a duty to support the child or whether the child has other income.¹ Spending UTMA funds does not reduce anyone’s existing child support obligation.

There’s a narrower option when the person making the gift also serves as custodian. In that situation, the transferor-custodian can elect a restricted standard under which no funds may be spent before the termination date except by court order, and only for the child’s support, maintenance, or education.¹ It’s worth considering if you want to preserve the account for a specific future purpose like college.

Naming a Successor Custodian

Planning for custodian replacement is easy to overlook and expensive to fix later. A custodian can designate a successor at any time by signing and dating a written instrument before a witness. The designation takes effect only when the custodian resigns, dies, or becomes incapacitated, unless the instrument also includes the resignation.¹ The original transferor can also name successors in the transfer document itself, and the transferor’s designation takes priority over one the custodian later makes.

Without a designated successor, the fallback depends on the child’s age. A child who is at least 14 can designate a successor from among adult family members, their conservator, or a trust company. If the child is under 14 or does nothing within 60 days, the child’s conservator automatically becomes successor custodian. If there is no conservator, any interested person can petition the court to appoint one.¹ Court proceedings are slow and costly, so naming a successor upfront is the better path.

Tax Rules for UTMA Accounts

Because the assets legally belong to the child, the account’s investment income is reported on the child’s return. For a young child with little other income, the first portion of earnings can be tax-free or taxed at a low rate. The federal kiddie tax caps that benefit once unearned income crosses a threshold.

The Kiddie Tax in 2026

For 2026, the kiddie tax works in three tiers. The first $1,350 of a child’s unearned income (dividends, interest, capital gains) is tax-free. The next $1,350 is taxed at the child’s own rate. Any unearned income above $2,700 is taxed at the parent’s marginal rate.⁵ The kiddie tax applies to children under 18, to 18-year-olds whose earned income doesn’t exceed half their support, and to full-time students aged 19 through 23 under the same earned-income test.

If the child’s total investment income is under $13,500 and consists only of interest, dividends, and capital gain distributions, you can report it on your own return using Form 8814 instead of filing a separate return for the child.⁵ That simplifies filing but can sometimes produce slightly higher tax, so running both approaches before choosing is worth the time.

The practical takeaway: a UTMA delivers meaningful tax savings only on the first $2,700 of annual investment income. Above that, you’re paying at your own rate anyway. Custodians managing for growth should factor this in, since tax-efficient index funds and growth stocks with modest annual distributions keep more of the return inside the favorable zone.

Gift Tax on Contributions

Every contribution to a UTMA account is a completed gift for federal tax purposes. In 2026, the annual gift tax exclusion is $19,000 per recipient.⁶ You and your spouse can each give up to $19,000 to the same child in the same year with no gift tax filing, for a combined $38,000. Gifts above the exclusion count against your lifetime estate and gift tax exemption and require filing Form 709, though no actual tax is owed until that lifetime exemption is used up.

The Estate-Tax Trap for Donor-Custodians

Families regularly trip on this one. If you transfer assets to a UTMA account and also serve as custodian, those assets may be pulled back into your taxable estate if you die before the child reaches the transfer age. Federal law includes in a decedent’s gross estate any transferred property over which the decedent retained the power to direct how it’s used or distributed.⁷ A custodian’s broad power to spend UTMA funds for the child’s benefit can be treated as exactly that kind of retained power.

The fix is straightforward: name someone other than the donor as custodian. If a grandparent funds the account, a parent can serve. If a parent funds it, the other parent or another trusted adult can serve. For most families the estate tax exemption is high enough that this never becomes a live issue, but for larger accounts or higher-net-worth families it’s worth avoiding from day one.

Impact on College Financial Aid

UTMA accounts can meaningfully reduce a student’s financial aid eligibility. Because the account legally belongs to the child, the FAFSA treats it as a student asset rather than a parent asset. The federal formula assesses student assets at 20% per year, so one-fifth of the UTMA balance is expected to go toward college costs annually.⁸ Parent-owned assets like 529 plans are assessed at a maximum rate of about 5.64%.

A $50,000 UTMA account increases the student’s expected family contribution by $10,000 per year. The same $50,000 in a parent-owned 529 plan would increase it by roughly $2,800. Schools that use the CSS Profile for institutional aid also require reporting of UTMA accounts as student assets. If need-based aid is likely to matter, a 529 plan or an irrevocable trust can accomplish similar goals with a much smaller hit to eligibility.

When the Child Gets the Money

By default, the custodian must transfer all remaining assets to the child when the child turns 18.⁹ California allows delay, but the maximum age depends on how the account was funded.

Irrevocable lifetime gifts, the most common funding method, can be delayed only until the child turns 21.¹⁰
Transfers from wills, trusts, or powers of appointment can be delayed until the child turns 25.¹⁰

To delay the transfer, the statutory language in the account registration must specify the age, using the format “as custodian for [name] until age [age] under the California Uniform Transfers to Minors Act.”¹⁰ If the transfer document does not include an age, the default is 18. You cannot add a delayed age later, since the original transfer language controls.

This distinction carries weight. Many parents are comfortable giving an 18-year-old access to a modest account but uneasy about handing a large sum to someone that young. If control past 21 matters and the transfer is a straightforward gift, a UTMA won’t get you there; a trust offers more flexibility on both timing and conditions.

What Happens If a Custodian Mismanages the Account

Courts have ordered custodians to return every dollar of improperly spent funds plus interest, pay any tax liability the child incurred as a result, and cover the child’s attorney’s fees. In one case, a custodian who invested UTMA funds in speculative penny stocks was ordered to repay $65,000 in lost principal plus $15,000 for lost investment appreciation. In another, a custodian who diverted funds to cover personal expenses and child support obligations was ordered to return the money and removed as custodian. Courts have awarded attorney’s fees against a breaching custodian that exceeded the total value of the account.

The statutory standard for uncompensated custodians provides some cover against ordinary investment losses, but none against bad faith, gross negligence, or spending the child’s money on yourself.⁴ Clear records and a separate account are your best defense if anyone ever questions your management.

1
Justia Law. California Probate Code 3900-3925 – California Uniform Transfers to Minors Act
2
California Legislative Information. California Probate Code 3909
3
California Legislative Information. California Probate Code Part 9 – California Uniform Transfers to Minors Act
4
California Legislative Information. California Probate Code 3912
5
Internal Revenue Service. Topic No. 553, Tax on a Child’s Investment and Other Unearned Income (Kiddie Tax)
6
Internal Revenue Service. What’s New – Estate and Gift Tax
7
Office of the Law Revision Counsel. 26 USC 2038 – Revocable Transfers
8
Federal Student Aid. 2025-2026 Student Aid Index (SAI) and Pell Grant Eligibility Guide
9
California Legislative Information. California Probate Code 3920
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California Legislative Information. California Probate Code 3920.5