Who Claims the Income on a Custodial Account? A Plain-English 2026 Tax Guide

The minor child is the legal owner of all income in a UGMA or UTMA custodial account and their Social Security number is the one reported to the IRS. In 2026, the first $1,350 of unearned income is tax-free, the next $1,350 is taxed at the child's rate, and anything above $2,700 is taxed at the parent's marginal rate under the kiddie tax (IRC Section 1(g)), reported via Form 8615 attached to the child's own Form 1040.

The minor child, not the parent who opened the account, is the legal owner of all income generated inside a UGMA or UTMA custodial account. That means the child's Social Security number is the one tied to every 1099-DIV and 1099-INT the brokerage sends out. But ownership is only half the story. The kiddie tax, codified in Internal Revenue Code Section 1(g), can push the actual tax bill onto the parents even when the child signs the return. This guide maps the three distinct tax situations custodians face in 2026, walks through who files what form, and flags the mistake that costs families the most.

The Short Answer: The Child Owns the Income, With a Major Catch

The minor child listed on the account application is the owner of every dollar that enters a UGMA or UTMA custodial account. Dividends, interest payments, capital gains distributions: all of it belongs to the child under federal tax law. That is why the brokerage reports all income under the child's Social Security number, not the custodian's.

The custodian, typically a parent or grandparent, manages the assets but holds no ownership interest. The IRS views the arrangement as an irrevocable gift. Once funds are deposited, they cannot be reclaimed by the adult who put them there. This ownership structure is what makes custodial accounts distinct from parent-owned brokerage accounts where the adult simply earmarks funds for a child's future.

But here is the catch that catches families off guard: while the child owns the income, the kiddie tax may force that income to be taxed at the parent's marginal rate. The child's name stays on the return, but the tax bill can look nothing like what a low-bracket minor would normally pay.

For a deeper look at how this ownership structure interacts with the obligation to actually cut the check to the IRS, see our guide on who pays taxes on a custodial account.

How Custodial Accounts Are Structured (UGMA vs. UTMA in 30 Seconds)

A custodial account is a taxable investment or savings account that an adult opens for a minor beneficiary. The adult acts as custodian, making all trading and withdrawal decisions, but the minor is the beneficial owner. When the child reaches the state-defined age of majority, typically 18 or 21, depending on the state and whether the account is UGMA or UTMA, full legal control transfers to the now-adult beneficiary automatically. There is no opt-out for the custodian. The handover is mandatory.

Two statutes govern these accounts, and knowing which one applies matters because it determines what assets the account can hold.

UGMA accounts

The Uniform Gifts to Minors Act is the original framework, adopted by all 50 states. UGMA accounts are limited to traditional financial assets: stocks, bonds, mutual funds, ETFs, cash, and insurance policies. Real estate, fine art, and other hard assets cannot be held in a UGMA. The age of majority under UGMA is typically 18, though some states set it at 21. Once the minor reaches that age, the custodian must transfer the assets outright. There is no provision for staggered distributions or continued oversight.

UTMA accounts

The Uniform Transfers to Minors Act is the broader successor statute, now adopted by every state except South Carolina. UTMA accounts can hold essentially any type of property: real estate, intellectual property, partnership interests, collectibles, in addition to all the financial assets UGMA permits. The age of majority under UTMA is typically 21, though states vary. This extra runway can matter for tax planning: a child who turns 18 under a UGMA gains control immediately, while a UTMA beneficiary might have three more years before the account becomes theirs to manage directly.

Custodial Roth IRA: a different beast

A custodial Roth IRA is a retirement account, not a general-purpose savings vehicle, and it follows entirely different rules. The minor must have earned income, wages from a summer job, self-employment income from babysitting or lawn mowing, to contribute. For 2026, the contribution limit is $7,500 or the total of the minor's earned income, whichever is less (NerdWallet, April 2026). Because contributions are made with after-tax dollars and qualified withdrawals are tax-free, a custodial Roth IRA sidesteps the annual tax-reporting headache that taxable UGMA and UTMA accounts create. But it requires the child to actually have a job.

The essentials

• The minor child is the legal owner of all custodial account assets and income for tax purposes, the child's SSN, not the custodian's, goes on every tax document.
• In 2026, the first $1,350 of a child's unearned income is exempt from federal tax; the next $1,350 is taxed at the child's own rate (Investopedia, 2026).
• Any unearned income above $2,700 triggers the kiddie tax, which taxes the excess at the parent's marginal rate, not the child's, via IRS Form 8615.
• The kiddie tax applies until the child turns 19, or age 24 for full-time students who do not provide more than half of their own support through earned income.
• Parents may elect to report a child's interest and dividend income on their own Form 1040 using Form 8814, but only under narrow eligibility conditions.

The Three Tax Situations Every Custodian Faces in 2026

The tax treatment of custodial account income depends on a two-tier threshold system. Understanding where a child's unearned income falls on this spectrum determines who files, what form to use, and at whose rate the income is taxed. These three scenarios cover every possible outcome for 2026.

Take a concrete example: a 15-year-old with no job holds a UTMA account that generates $2,400 in dividend income during 2026. She has no earned income. Here is how that $2,400 plays out across the three tiers.

For a broader overview of how these thresholds interact with overall custodial account obligations, our guide to custodial account tax rules covers the full compliance picture.

Situation 1, Income under $1,350: no federal tax owed

If a child's total unearned income for the year is $1,350 or less, no federal income tax return is required and no tax is owed on that income. The first $1,350 of unearned income is fully exempt (Investopedia, 2026).

For the 15-year-old in our example with $2,400 in dividends, she blows past this threshold. So she moves into Situation 2. But a child earning only $900 in interest from a custodial savings account would stop here: no return, no tax, no forms. The custodian does nothing beyond keeping the 1099-INT in the file.

One caveat: this $1,350 exemption is federal only. Some states have their own filing thresholds and may require a state return even when no federal return is due.

Situation 2, Income above $1,350: the child files at their own rate

Once unearned income exceeds $1,350, the child must file a federal tax return. The first $1,350 remains tax-free. The next portion, up to the kiddie-tax trigger point, is taxed at the child's own marginal rate.

In 2026, the kiddie tax trigger sits at $2,700 total unearned income. That means the band between $1,351 and $2,700 is taxed at the child's rate. For our 15-year-old with $2,400 in dividends, the math works out like this: $1,350 is exempt, and the remaining $1,050 falls into the child's-rate band, taxed at 10%, the lowest bracket. Her federal tax liability comes to roughly $105, and she files her own Form 1040.

No Form 8615 is required at this level. The child simply reports the dividend income on a standard 1040 and pays the small bill.

Situation 3, Kiddie tax kicks in: income taxed at the parent's rate

When a child's total unearned income crosses $2,700, the kiddie tax activates under IRC Section 1(g). The first $1,350 stays tax-free, the next $1,350 stays at the child's rate, and everything above $2,700 is taxed at the parent's marginal rate.

If our 15-year-old had earned $5,000 in dividends instead of $2,400, the breakdown would be: $1,350 tax-free, $1,350 taxed at her 10% rate ($135), and the remaining $2,300 taxed at her parent's rate. If the parent is in the 24% bracket, that last slice costs $552. Total federal tax: approximately $687, versus the $500 she would have paid if all income above the exemption were taxed at her own 10% rate.

Form 8615 must be attached to the child's Form 1040. This form computes the tax at the parent's rate and requires the parent's taxable income figure. The child still files her own return; the parent does not absorb the income onto theirs.

Who Actually Files the Return, Child, Parent, or Both?

Knowing which tax situation applies is step one. Knowing who physically files the paperwork is step two, and the answer is not always "the child files alone." The IRS provides multiple filing paths depending on the child's age, income type, and total income level.

IRS Publication 929, "Tax Rules for Children and Dependents," is the authoritative source for these procedures, and it is worth bookmarking if you manage a custodial account.

The filing decision also shapes the practical question of who is responsible for paying taxes in a custodial account, since the filer and the payer are not always the same person in practice.

When the child files a standalone return

When unearned income exceeds $1,350 and the parent does not elect Form 8814, the child files a standalone Form 1040. This return reports all the child's income, earned and unearned, under the child's name and SSN. If the kiddie tax applies, Form 8615 is attached. The child signs the return. A parent may prepare and file it on the child's behalf if the child is too young to handle the paperwork, but the IRS treats the child as the filer of record.

The standard deduction for a dependent child filing a return with only unearned income is capped at the greater of $1,350 or earned income plus $450, up to the full $14,600 single-filer standard deduction for 2026.

When parents can report the child's income on their own return

IRS Form 8814 allows parents to report a child's interest and dividend income directly on the parent's Form 1040, skipping a separate child return entirely. This election is available only when four conditions are all met: the child was under 19 (or under 24 and a full-time student) at year-end, the child's income consists exclusively of interest and dividends (including capital gain distributions reported as dividends), total gross income is under $13,500 for 2026, and no estimated tax payments were made in the child's name.

Form 8814 is convenient but can be costly. The parent's marginal rate applies to the included income, which may be higher than what the child would pay on a standalone return. Conversely, if the parent is in a low bracket and the child's income would trigger the kiddie tax anyway, Form 8814 saves the hassle of a second return with no rate penalty.

Form 8615: what it is and when it's required

Form 8615, "Tax for Certain Children Who Have Unearned Income", is the mechanism that enforces the kiddie tax. It must be attached to the child's Form 1040 whenever the child's unearned income exceeds $2,700 and the child is subject to the kiddie tax rules based on age and support status.

The form computes the child's tax liability by applying the parent's marginal rate to the excess unearned income above the $2,700 threshold. To complete it, the filer needs the parent's taxable income from their own return. If parents file jointly, the joint taxable income is used. If parents are divorced, the custodial parent's taxable income is the relevant figure.

IRS instructions for Form 8615 include a worksheet for determining which parent's rate applies and how to allocate when parents file separately.

The Most Expensive Mistake Parents Make With Custodial Account Taxes

The most frequent tax error custodians make is not a wrong form or a missed deadline. It is the assumption that once the child turns 18, the kiddie tax no longer applies. That assumption is dangerously incomplete.

The kiddie tax applies through the year in which the child turns 19 if the child does not provide more than half of their own support from earned income. And the rule extends further: for a full-time student, it applies through the year the child turns 24, again provided the child's earned income does not exceed half of their own support.

In practice, a college sophomore with a UTMA account generating $6,000 in annual capital gains distributions can still get hit with the kiddie tax at age 20, taxed at a parent's 32% or 35% marginal rate. The money belongs to the student. The 1099 carries the student's SSN. But the tax bill is calculated using mom or dad's bracket.

Families who file without Form 8615 in this situation face an IRS matching notice, back taxes, and potential underpayment penalties. The IRS receives copies of all 1099 forms and cross-references them against filed returns by SSN. A discrepancy between reported income and a return that omits Form 8615 triggers an automated inquiry.

For the full breakdown of what triggers an actual tax bill on these accounts, see do you have to pay taxes on custodial accounts.

What Happens to the Tax Obligation When the Child Reaches the Age of Majority?

Once the child no longer meets the kiddie tax age and support criteria, the tax landscape simplifies sharply. All custodial account income is taxed exclusively at the adult child's own marginal rate. Form 8615 drops out of the picture. The former minor, now the account owner in full legal control, files a standard Form 1040 reporting dividends, interest, and capital gains just like any other taxpayer.

Two practical shifts occur simultaneously. First, legal control transfers per state law: the custodian must retitle the account into the beneficiary's name alone. Second, the tax obligation shifts entirely onto the now-adult beneficiary. These two events may not align perfectly. A child could reach the age of majority under state law at 18 while still being subject to the kiddie tax until 19 or 24.

A planning flag worth noting involves financial aid. Assets held in a custodial account are counted as the student's assets on the Free Application for Federal Student Aid (FAFSA), where they are assessed at a higher rate than parental assets. A custodial account valued at $30,000 could reduce need-based aid eligibility by roughly $6,000 under the standard federal formula. Families weighing college funding strategies often evaluate whether to spend down custodial account assets on qualified education expenses before the FAFSA base year.

Sources

• irs.gov
• investopedia.com
• nerdwallet.com
• nerdwallet.com

The information provided here is general in nature and is not a substitute for advice from a licensed financial advisor. Review your situation with a professional before committing.