How a UTMA Custodial Account Works: Investing for a Child, and the Kiddie Tax

A UTMA account, also called a custodial account, lets an adult invest for a child. The money belongs to the child from the first day, an adult manages it, and the child takes control at 18 or 21. There is no tax relief on the way in and no special shelter: dividends and gains are taxed every year, in the child's name, under the kiddie-tax rules. This guide explains how the account works, how it is taxed, and when a 529 plan is the better choice. All figures are for 2026.

How a UTMA account works

You open the account at a broker as the custodian, for one child. The rules come from your state's version of the Uniform Transfers to Minors Act (UTMA). Some accounts still run under the older Uniform Gifts to Minors Act (UGMA), which allows fewer kinds of assets. For stocks, funds and cash, the two work the same way.

• The gift is final. Once money goes in, it is the child's. You cannot take it back, and you cannot move it to another child.
• You manage it. As custodian, you choose the investments and must act prudently. You can spend the money only for the child's benefit.
• The child takes control. At the age your state sets (usually 18 or 21, and up to 25 in a few states), you must hand the account over. From that day, the child decides what to do with it.
• No contribution limit. Anyone can pay in. The gift-tax exclusion of $19,000 per giver per child in 2026 sets how much one person can give in a year without a gift-tax return.
• No deduction. A payment in is a gift, not a deduction.

UTMA or 529: the main differences

A 529 is better for money meant for school. A UTMA fits money with no fixed purpose: a first car, a first home, a business, or a gift from grandparents that the family wants invested in individual stocks. Read how a 529 plan works.

How a UTMA account is taxed: the kiddie tax

Dividends, interest and realized gains in the account are the child's income, taxed every year. To stop parents from moving income into a child's lower tax band, the kiddie tax applies to a child's unearned income above a threshold. In 2026 it works in three bands:

The kiddie tax applies to a child under 18 at the end of the year, and to a full-time student under 24 who does not support themselves from their own earnings. The child files their own return once the income passes the filing threshold. In narrow cases (only interest and dividends, below a set amount), a parent can report the child's income on their own return with Form 8814 instead. The rules are in IRS Topic 553.

What this means in practice

A child with $4,000 of dividends in 2026 pays no tax on the first $1,350, the child's rate on the next $1,350, and the parent's rate on the last $1,300. So the account saves tax only on its first $2,700 of income each year. A portfolio that yields 2% in dividends reaches that level at about $135,000.

Two habits help:

• Prefer funds with low payouts and low turnover. Broad index funds and growth stocks keep the yearly income small, so more of the return grows untaxed until it is sold.
• Use the low bands each year. Realizing some long-term gains while the child's income stays under $2,700 can reset the cost basis at a low or zero rate.

When the child takes control, there is no tax: the income was taxed as it arose, so there is no deferred tax to pay.

Spending the money

You can spend UTMA money on things that benefit the child: education, a computer, camps, travel, medical costs. You should not use it for costs a parent must pay anyway, such as basic food and housing, because the money is not yours. If the child later asks, you must be able to show how you spent it.

At the age of majority, the full account passes to the child, whatever their plans. This is the main risk of a UTMA: an 18-year-old can spend it all. If that worries you, a 529 plan keeps you in control.

UTMA accounts and financial aid

On the FAFSA, a UTMA counts as the student's asset, which reduces aid by about 20% of its value each year. A parent-owned 529 counts at most about 5.6%. Some families sell the UTMA investments and move the cash into a custodial 529 for the same child. The money stays the child's, but the FAFSA treats a custodial 529 as a parent asset. A sale can create taxable gains, so plan it over several years.

Foreign withholding inside a UTMA account

A UTMA is a taxable account, so foreign tax works as it does in your own brokerage account. A foreign country withholds tax on its dividends at the treaty or ordinary rate, and there is no exemption. The child can claim the foreign tax credit on their own return, which brings most of that tax back if the child owes US tax on the income. Read more in what is dividend withholding tax.

Track your UTMA account with the rest of your portfolio in Cadances

A custodial account sits next to your own 401(k), IRAs and taxable account, and maybe a 529 for the same child. Cadances is a portfolio tracker: it puts all of them in one place and gives you one total, one allocation and one performance figure, while it keeps each account's tax rules apart.

• An account type priced the way the law prices it. On the Portfolios screen, UTMA / UGMA is its own account type, with taxable treatment. Dividends and gains inside it show as taxed, because they are.
• The kiddie tax, made visible. For US residents, the Tax screen compares the account's dividends for the year with the $2,700 threshold, and tells you when they pass it and Form 8615 applies. It shows no exit tax, because there is none.
• One portfolio per child. Keep each child's UTMA and 529 in their own portfolios, so you can follow each child's savings separately and see your family's total in one view. Import the export file from your broker, or add the holdings by hand.
• Performance and allocation. On Performance, compare the account with the S&P 500 over the window you pick. Set allocation rules and see when the mix drifts away from your target.

One limit to keep in mind: Cadances sees only this portfolio. If the child has interest, gains or other unearned income elsewhere, it counts toward the $2,700 too, so treat the flag as a floor, not the full figure.

Start free. Create your Cadances account: no card, no time limit. The Free plan holds one portfolio of up to 15 holdings, which is enough for one custodial account. To track an account for each child next to your own, compare the paid plans.

The bottom line

• A UTMA is an irrevocable gift: the money is the child's, and the child takes control at 18 or 21.
• There is no contribution limit and no deduction; the gift-tax exclusion is $19,000 per giver in 2026.
• Income is taxed every year: the first $1,350 is free, the next $1,350 is at the child's rate, and above $2,700 the parent's rate applies on Form 8615.
• Low-payout funds keep the kiddie tax small.
• For money meant for school, a 529 plan is usually better, for tax and for financial aid.

Each monthly payment is dollar-cost averaging by design, and a diversified mix inside the account matters as much as the amount you put in.

This article is general information, not tax or legal advice. Your state's law and your own situation decide what applies to you.