The tax consequences of a Uniform Gifts to Minors Act (or Uniform Transfers to Minors Act) account fall into four buckets: income tax on what the account earns, gift tax on what the donor puts in, possible estate tax if the donor also acts as custodian, and a basis rule that follows the assets when the child takes control. On top of those, the account can sharply cut college financial aid. For 2026, the income tax piece works in three tiers: the first $1,350 of the child’s unearned income is effectively tax-free, the next $1,350 is taxed at the child’s rate, and anything above $2,700 is taxed at the parents’ marginal rate under the Kiddie Tax.1Internal Revenue Service. Topic No. 553, Tax on a Child’s Investment and Other Unearned Income (Kiddie Tax)
How the Account’s Income Is Taxed
Every dollar of interest, dividends, capital gains, and rent produced inside a UGMA or UTMA belongs to the child for tax purposes. The child is the legal owner of the assets from the moment they are contributed, so the IRS treats the earnings as the child’s unearned income.
The first tier, $1,350 for 2026, is sheltered by the standard deduction available to a dependent with investment income. The second tier, the next $1,350, is taxed at the child’s own rate, which for most children with no job income means 10% on ordinary income. An account that throws off $2,700 or less in a year will usually generate little or no federal tax.
The third tier is where the Kiddie Tax bites. Unearned income above $2,700 is taxed at the parents’ marginal rate rather than the child’s. If the parents sit in the 32% bracket, the excess is taxed at 32%. The rule exists to stop high-income families from parking investments in a child’s name to pick up a lower rate.2Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
Capital gains get no escape hatch. Long-term gains inside the account still qualify for preferential rates, but the applicable rate is set by the parents’ income level, not the child’s. A child holding appreciated stock in the account can face a 15% or 20% long-term rate because of where the parents land on the income scale.
Who Gets Caught by the Kiddie Tax
The Kiddie Tax reaches more people than its name suggests. It applies to:
- Children under 18, automatically, regardless of job income.
- 18-year-olds whose earned income does not exceed half of their own support for the year.
- Full-time students aged 19 through 23 who meet the same support test.
Once a child ages out of these brackets, or their earned income passes half of their support, all custodial account income is taxed at the child’s own rate.2Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
Which parent’s rate applies depends on filing status. Married parents filing jointly use their combined income. Parents married but filing separately use the higher-income spouse’s rate. For divorced or unmarried parents, the rate comes from the parent who had custody for most of the year, even if someone else funded the account.3Internal Revenue Service. Instructions for Form 8615 (2025)
Reporting the Income: Form 8615 or Form 8814
Once unearned income clears $2,700, the family has to choose between two reporting paths, and the choice has real tax consequences.
The default path is Form 8615, attached to the child’s own Form 1040. Form 8615 calculates the tax on the portion of unearned income subject to the parents’ rate; the parent provides their name, Social Security number, and filing status so the IRS can apply the correct bracket.4Internal Revenue Service. Form 8615 – Tax for Certain Children Who Have Unearned Income Filing a separate return for the child preserves the child’s own lower rate on the first $2,700.
The shortcut is Form 8814. If the child’s only income is interest, dividends, and capital gain distributions, and the total is less than $13,500, the parent can skip the child’s return and report the income on their own.5Internal Revenue Service. Instructions for Form 8814 (2025) The trade-off: everything above $2,700 gets folded into the parents’ return at the parents’ rate, and the child loses the benefit of the lower tiers. For modest accounts the simplicity is usually worth it. For accounts producing several thousand dollars a year, the separate return with Form 8615 almost always produces a lower combined bill.1Internal Revenue Service. Topic No. 553, Tax on a Child’s Investment and Other Unearned Income (Kiddie Tax)
Gift Tax When You Fund the Account
Every contribution to a UGMA or UTMA is an irrevocable gift. The donor cannot take it back, redirect it to a different child, or reclaim it. The custodian has a fiduciary duty to use the assets solely for the child’s benefit.
For 2026, a donor can contribute up to $19,000 per child with no gift tax filing requirement. A married couple electing to split gifts can contribute up to $38,000 per child. Contributions within these limits do not reduce the donor’s lifetime exemption and do not require Form 709.6Internal Revenue Service. What’s New – Estate and Gift Tax
Contributions above $19,000 per donor per child in a year require the donor to file Form 709. Filing does not necessarily mean owing tax; the excess counts against the donor’s lifetime gift and estate tax exemption, which sits at $15,000,000 for 2026 following changes enacted by the One, Big, Beautiful Bill.6Internal Revenue Service. What’s New – Estate and Gift Tax Couples electing to split gifts have to file Form 709 even when the per-child total stays under $38,000; the election itself triggers the filing requirement.7Internal Revenue Service. Instructions for Form 709
UGMA and UTMA contributions qualify as present-interest gifts, which is what unlocks the annual exclusion. The IRS treats the gift as a present interest because the custodian can spend the property for the child’s benefit before majority, and whatever remains passes to the child at majority.8Office of the Law Revision Counsel. 26 USC 2503 – Taxable Gifts
The Estate Tax Trap: Donor as Custodian
This is the trap families miss. If the person who funded the account also serves as custodian and dies before the child reaches the age of majority, the entire account is pulled back into the donor’s taxable estate. The IRS treats the custodian’s power to spend account assets for the child’s benefit as a retained power over the gift, which is enough to trigger inclusion under the estate tax rules for revocable transfers.9Office of the Law Revision Counsel. 26 USC 2038 – Revocable Transfers
The fix is simple: do not serve as custodian on accounts you fund. Name a spouse, grandparent, or other trusted adult. For accounts already set up with the donor as custodian, appointing a successor custodian removes the risk going forward; the specifics depend on state law and the holding institution.
With the federal exemption at $15,000,000 for 2026, inclusion only produces an actual tax bill for very large estates. It still matters for planning, though, because it consumes exemption that could otherwise shelter other assets.6Internal Revenue Service. What’s New – Estate and Gift Tax
Carryover Basis When Control Transfers
The account terminates when the child reaches the age of majority, which runs from 18 to 25 depending on the state and how the transfer was set up. The custodian then hands over full control, and the beneficiary can do whatever they want with the assets.
The handoff itself is not a taxable event. The child already owned the assets; the custodian was only managing them. What carries over is the cost basis. The child inherits the donor’s original basis, not the current market value. If a parent contributed stock worth $5,000 with a basis of $2,000, the child’s basis is $2,000, and any future sale is measured from that starting point.10eCFR. 26 CFR 1.1015-1 – Basis of Property Acquired by Gift
This is one of the less obvious costs of gifting appreciated assets into a custodial account. Assets held until the donor’s death would have gotten a stepped-up basis at date of death, potentially erasing the built-in gain. Gifting them during life into the account locks in the lower basis, and for highly appreciated holdings that can mean a much larger tax bill when the child sells.
The Financial Aid Hit
UGMA and UTMA accounts land harder on the FAFSA than almost any other family savings vehicle. Because the child legally owns the assets, the federal aid formula treats the account as a student asset and assesses it at up to 20% per year. Money in a parent-owned 529 plan is assessed at roughly 5.6% as a parental asset. A $50,000 custodial account could cut aid eligibility by up to $10,000 in a single year; the same balance in a parent-owned 529 would reduce it by about $2,800.
A custodial 529 plan preserves the child’s ownership (since custodial gifts are irrevocable) while picking up the more favorable parental asset treatment on the FAFSA. The constraint is that 529 funds must be used for qualified education expenses, so the move only makes sense if college is in the picture.
For families expecting to qualify for need-based aid, the combination of the Kiddie Tax and the 20% FAFSA assessment makes a UGMA or UTMA one of the least tax-efficient places to save for a child’s education.