Who Pays Taxes on a Custodial Account? 2026 Kiddie Tax Rules

The child, not the parent, not the custodian, is legally responsible for paying taxes in a custodial account. Every dollar of dividends, interest, and realized capital gains inside a UTMA or UGMA account belongs to the minor beneficiary for tax purposes, even though the child may not have access to the funds until age 18 or 21. But legal ownership does not mean the child's low tax bracket always applies. The IRS Kiddie Tax (IRC Section 1(g)) can push a significant portion of that income onto the parent's marginal rate, creating a filing obligation that catches many families off guard. This guide walks through exactly who owes what, which IRS forms to use, and how the age-based rules determine the tax bill each year.

Comprendre qui paie les impôts sur un compte de garde est essentiel pour les parents et tuteurs.

Key takeaways

• [object Object]
• [object Object]
• [object Object]
• [object Object]
• [object Object]

The Short Answer: The Child Owns the Tax Bill, With a Big Catch

The child who benefits from the account is the legal taxpayer, full stop. A custodial account established under the Uniform Transfers to Minors Act (UTMA) or the Uniform Gifts to Minors Act (UGMA) creates an irrevocable gift to the minor. Once assets enter the account, they belong to the child for both legal and tax purposes, even though a custodian (typically a parent) manages them and the brokerage lists the custodian's name on statements and Form 1099.

The real question most parents face is not who the taxpayer is, but at whose rate the tax is calculated. The IRS Kiddie Tax rules overlay the child's ownership with a rate structure borrowed from the parent, creating a three-tier system that often surprises families the first time a 1099 arrives for a custodial account that seemed small.

Ces règles fiscales, y compris la Kiddie Tax, sont cruciales à connaître.

This is the tension at the center of custodial account taxation: the child owns the tax bill, but the IRS can tax a large slice of that bill at the parent's marginal rate, and the parent may end up doing most of the paperwork.

What 'custodial account' actually means for tax purposes

For IRS purposes, a custodial account is not a separate tax entity. It is simply a brokerage or bank account titled in the custodian's name "as custodian for [child's name] under [state's] UTMA/UGMA." The IRS disregards the custodian's name on the account and looks through to the beneficial owner, the minor. All income generated inside the account (dividends, interest, capital gains) is reported under the child's Social Security number, never the custodian's.

The custodian's role is purely administrative: managing investments, making withdrawals for the child's benefit, and eventually transferring control when the child reaches the age of termination under state law (typically 18 or 21). The custodian has no tax liability for the account's income and cannot legally use the funds for their own benefit. This distinction, custodian as manager, child as taxpayer, is the foundation that the Kiddie Tax rules then modify.

Why ownership ≠ tax rate

Ownership of the income (child) and the tax rate applied to it (sometimes the parent's) are legally distinct concepts under the Internal Revenue Code. IRC Section 1(g), the Kiddie Tax, does not reassign ownership of the income to the parent. It simply calculates the tax on the child's net unearned income using the parent's marginal rate bracket.

Why does this matter practically? Because the child remains the taxpayer on record. Any IRS notice, underpayment, or penalty will be addressed to the child, not the parent. The parent's involvement is limited to signing the child's return (since minors cannot execute legal documents) and providing their tax information for the Form 8615 calculation. A parent who assumes "the 1099 came in my name, so I'll report it on my return" without following the proper Kiddie Tax procedure risks an incorrect filing and potential IRS correspondence.

How the Kiddie Tax Works: Three Income Tiers That Determine Who Pays What Rate

The Kiddie Tax divides a child's unearned income into three buckets, each with its own tax treatment. For the 2025 tax year (returns filed in 2026), the thresholds are set by the IRS and adjusted annually for inflation. The structure applies identically whether the custodial account holds stocks, bonds, mutual funds, ETFs, or cash equivalents, the income type affects the rate within each tier, but the tier boundaries remain the same.

Understanding this three-bucket framework before tax season starts is what separates a smooth filing from a last-minute scramble. The tiers operate as a progressive filter: income passes through Tier 1 first, then Tier 2, then whatever remains lands in Tier 3 at the parent's rate.

Tier 1: Income below the tax-free threshold

The first $1,300 of a child's unearned income (for tax year 2025) is entirely tax-free. This is the standard deduction for a dependent child with only unearned income, and it shelters the first chunk of custodial account earnings regardless of the income type, dividends, interest, or capital gains all qualify.

A child with $800 in custodial dividend income owes zero federal tax and, in most cases, has no filing requirement at all. The tax-free tier operates automatically: no form is needed to claim it, though filing becomes mandatory once total unearned income crosses the filing threshold. This tier exists precisely because Congress recognized that small custodial accounts, birthday gifts from grandparents, modest UGMA savings, should not generate tax complexity for families.

Tier 2: Income taxed at the child's own rate

The next $1,300 of unearned income (from $1,301 to $2,600 for 2025) is taxed at the child's own marginal rate. Since most children have little or no earned income, this typically means the lowest bracket: 10% for ordinary income like non-qualified dividends and short-term capital gains. Qualified dividends and long-term capital gains falling in this tier may be taxed at 0% if the child's total taxable income stays within the zero-rate threshold for those preferential categories.

At this tier, the child files their own return but does not yet need Form 8615, the Kiddie Tax computation only triggers when unearned income exceeds $2,500. A teenager with $2,000 in custodial dividends pays nothing on the first $1,300 and 10% (or potentially 0% for qualified dividends) on the remaining $700, all at their own rate. The filing is straightforward and the parent's tax information is not required.

Tier 3: Income pushed to the parent's rate (Kiddie Tax zone)

Any unearned income above $2,500 (for 2025) enters the Kiddie Tax zone and is taxed at the parent's top marginal rate. The IRS calls this portion "net unearned income" on Form 8615, and it is calculated by subtracting $2,500 from the child's total unearned income. This is not a cliff, the parent's rate applies only to the excess above $2,500, not to the entire amount.

Here is where the filing complexity spikes. Form 8615 must be attached to the child's separate return, and the parent must provide their filing status, taxable income, and marginal rate. If the parent's marginal rate is 24%, 32%, or higher, the tax bite on Tier 3 income can be substantial, far beyond what the child's own 10% bracket would produce. The Kiddie Tax was enacted in 1986 specifically to close the loophole of parents shifting investment assets to children to exploit the rate differential, and this third tier is the mechanism that closes it.

Worked example: a 14-year-old with custodial dividends

Take a 14-year-old with a custodial account that generated $3,000 in dividend income during 2025. The child has no earned income from a summer job and is a dependent on the parent's return. The parent's top marginal rate is 24%.

• Tier 1: The first $1,300 is covered by the child's standard deduction. Tax owed: $0.
• Tier 2: The next $1,300 (from $1,301 to $2,600) is taxed at the child's rate. Assuming ordinary (non-qualified) dividends, the 10% bracket applies. Tax owed: $130.
• Tier 3: The remaining $400 (above the $2,500 Kiddie Tax threshold) is taxed at the parent's 24% marginal rate. Tax owed: $96.
• Total tax: $226 on $3,000 of income, an effective rate of about 7.5%.

Compare this to what the family might expect. Without the Kiddie Tax, the entire taxable portion ($1,700 after the standard deduction) would be taxed at the child's 10% rate, yielding $170 in tax. The Kiddie Tax adds $56, modest in this example, but the difference scales rapidly with larger custodial balances. A child with $12,000 in custodial dividends would see $9,500 taxed at the parent's rate, potentially adding thousands to the family's combined tax bill.

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

The child's name on the account determines who owes the tax. The income thresholds determine who files the paperwork. This distinction trips up even experienced parents: the child is legally required to file their own return once unearned income crosses the IRS filing threshold ($1,300 for 2025), even though the parent will almost certainly be the one preparing it and signing on the child's behalf.

A second path exists, the parent election under Form 8814, which lets the parent report the child's income on their own return under limited conditions. Choosing between these two filing methods is the most practical decision custodians face each tax season, and the wrong choice can mean an IRS notice or an unnecessarily high tax bill.

The custodian's role vs. the taxpayer's role

The custodian's name appearing on the brokerage 1099 is a reporting convention, not a tax assignment. Brokerages issue Form 1099-DIV and 1099-INT under the custodian's name and SSN because the custodian is the legal signatory on the account. But the 1099 also includes the child's SSN in the "recipient's TIN" field, and the IRS matches that income to the child's Social Security number.

The custodian's practical responsibility is to forward the 1099 to whoever prepares the child's return and to ensure filing happens. This is an administrative duty, not a tax liability. If the child's return is never filed, the IRS will pursue the child (once they reach majority, through collection procedures), not the custodian. However, the custodian who ignores the filing obligation creates a problem the child inherits at age 18 or 21, unpaid taxes plus interest and potential penalties.

State UTMA/UGMA laws give the custodian authority to use custodial funds for the child's benefit, which includes paying the child's tax bill from the custodial account itself. This is often the most practical approach: the account generates the income, and the account pays the resulting tax.

Form 8615 vs. Form 8814: which one applies?

The choice between Form 8615 and Form 8814 is governed by strict IRS eligibility rules, not by family preference. The decision tree is binary:

Form 8615 path (child files own return). Required when the child's unearned income exceeds $2,500 (for 2025) and the child has a filing requirement. Form 8615 is attached to the child's Form 1040 and computes the Kiddie Tax using the parent's taxable income and filing status. The parent must sign the child's return. This path is mandatory when Form 8814 conditions are not met.

Form 8814 path (parent election). Available only if ALL of the following conditions are satisfied: (1) the child's only income is interest, dividends, and capital gain distributions (no earned income, no Social Security benefits, no income from a trade or business); (2) the child's total gross income is under $12,500 (for 2025); (3) no estimated tax payments were made in the child's name; and (4) no federal income tax was withheld from the child's income. Filing Form 8814 adds the child's income above $2,500 directly to the parent's taxable income, taxed at the parent's rate.

Form 8814 simplifies paperwork, one return instead of two, but may increase the parent's adjusted gross income, potentially affecting AGI-sensitive deductions, credits, and phaseouts. Form 8615, while requiring a separate child return, keeps the income off the parent's AGI. The trade-off between simplicity and AGI impact is the core decision families face.

Common mistake: assuming the custodian's name on the 1099 means the custodian pays the tax

The single most frequent error families make: seeing the custodian's name on the Form 1099 and assuming the custodian reports the income on their own return as if it were theirs. This mistake has real consequences.

If the parent simply adds the custodial dividends to their own Form 1040 Schedule B without either filing Form 8814 (the parent election) or preparing a separate child return with Form 8615, the filing is technically incorrect. The IRS document-matching system may flag the discrepancy between the 1099 issued under the child's SSN and the absence of that income on any return filed under that SSN. The result: a CP2000 notice proposing additional tax, often months or years after the original filing.

A second variation of this mistake: the parent assumes that because the account is small, say, $1,800 in dividends, no filing is needed at all. At $1,800, the child exceeds the $1,300 filing threshold and must file a return. The tax may be minimal ($50 on the Tier 2 portion), but the filing obligation exists independently of the tax due. Failure-to-file penalties (5% of unpaid tax per month, up to 25%) can apply even when the tax owed is small.

Age Matters: When the Kiddie Tax Stops Applying

Age determines when the Kiddie Tax stops overriding the child's own tax rate. The IRS draws two bright lines: age 19 for non-students and age 24 for full-time students. After crossing the applicable line, the child files as an independent taxpayer, and the parent's rate is out of the picture, permanently.

State UTMA and UGMA laws operate on a separate timeline. The age at which the custodian must transfer control of the account to the beneficiary (typically 18 or 21) has no bearing on federal tax rules. A 21-year-old full-time student still falls under the Kiddie Tax until age 24, even if they gained full legal control of the custodial account at 18 under their state's law.

Under 19: Kiddie Tax applies regardless of employment

For any child under age 19 at the close of the tax year, the Kiddie Tax applies regardless of how much earned income the child has from a job. Working summers at a restaurant does not exempt a 17-year-old from Kiddie Tax treatment on custodial account dividends. The only exception is the narrow case where the child provides more than half of their own support from earned income, rare for minors still living at home.

This blanket rule means that every custodial account held by a child under 19, no matter the balance or the child's employment status, must be evaluated through the three-tier Kiddie Tax framework each year. There is no de minimis exception and no opt-out.

Full-time students ages 19–23: the earned-income test

For full-time students ages 19 through 23, the Kiddie Tax applies only if the child's earned income does not exceed half of their own support. "Support" includes housing, food, education, medical care, clothing, and other living expenses, the parent's contributions count toward the support total. If the child earns enough from employment to cover more than half of these costs, the Kiddie Tax does not apply, and the child files independently at their own rate.

This earned-income test creates a planning opportunity. A 20-year-old college student with a custodial account generating $6,000 in dividends could potentially escape Kiddie Tax treatment by earning enough from a job or paid internship to cross the 50% support threshold. But the test applies annually, a summer internship in 2025 does not protect against Kiddie Tax in 2026 if the child returns to full-time study without sufficient earned income.

Pour plus de détails sur les règles fiscales des comptes de garde, consultez les directives de l'IRS.

Age 24 and older: full tax independence

At age 24, the Kiddie Tax disappears regardless of student status, earned income, or support. The child, now an adult for all tax purposes, files a standard Form 1040 and pays tax entirely at their own marginal rate. Custodial account income is reported as ordinary investment income, and the parental rate connection is severed.

For non-students, this milestone arrives earlier: age 19. The transition year requires attention because the Kiddie Tax applies based on age at year-end. A child who turns 19 on December 28, 2026, is still subject to the Kiddie Tax for the entire 2026 tax year, the birthday arrives too late to affect that year's filing. Tax independence begins with the tax year in which the child is 19 (or 24) on December 31.

Types of Custodial Account Income and How Each Is Taxed

Every type of investment income inside a custodial account is classified as unearned income and flows through the Kiddie Tax tiers. But the tax rate applied within each tier depends on the character of the income, ordinary rates for some types, preferential rates for others. Custodians who understand these distinctions can structure the account's holdings to minimize the tax drag over the child's accumulation years.

Dividends and interest: taxed in the year received

Interest from bonds, CDs, money market funds, and savings accounts is taxed as ordinary income at every tier. Non-qualified dividends, typically from REITs, certain foreign stocks, and money market funds, also face ordinary rates.

Qualified dividends from US corporations and certain foreign stocks receive preferential long-term capital gain rates: 0%, 15%, or 20% depending on total taxable income. In Tier 2 (the child's own rate), qualified dividends often escape taxation entirely because the child's income rarely pushes into the 15% qualified dividend bracket. In Tier 3, however, the parent's qualified dividend rate applies, and for most parents, that means 15% or 20%.

Both interest and dividends are taxable in the year received, regardless of whether the custodian reinvests them or holds them as cash inside the account. A dividend reinvestment plan (DRIP) does not defer the tax event, the reinvested amount is taxable exactly as if it had been paid in cash.

Capital gains: short-term vs. long-term rates inside a custodial account

When the custodian sells an asset inside the custodial account at a gain, the tax treatment depends on the holding period. Assets held for one year or less generate short-term capital gains, taxed at ordinary income rates, 10%, 12%, or higher depending on the applicable tier. Assets held for more than one year generate long-term capital gains, taxed at preferential rates: typically 0% for a child in Tier 2, and 15% or 20% in Tier 3 depending on the parent's bracket.

This holding-period distinction creates a straightforward tax-management strategy for custodial accounts. Deferring sales until the one-year mark converts what would be ordinary income into long-term gain, potentially reducing the tax rate from the parent's 24% or 32% to 15%. For a custodial account with significant appreciated positions, the tax savings from crossing the long-term threshold can be material, especially when gains fall into Tier 3 at the parent's rate.

Unrealized gains: no tax event until the asset is sold

Assets sitting inside a custodial account that have increased in value but have not been sold generate no current tax liability. Unrealized gains, the difference between the current market value and the original purchase price, are invisible to the IRS until the custodian executes a sale.

This is one structural advantage of custodial accounts for long-term family wealth transfer. A stock purchased at $5,000 that grows to $15,000 over a decade produces no annual tax bill on the $10,000 appreciation. Only when the custodian sells (or the child, after gaining control) does the gain become taxable. The strategy of "buy and hold until after age 24", accumulating unrealized gains while the child is subject to Kiddie Tax, then realizing them once the child files independently at their own lower rate, is legally permissible and commonly used by families who plan custodial accounts with tax efficiency in mind.

Note that tax-loss harvesting, selling losing positions to offset gains, works inside custodial accounts exactly as it does in adult taxable accounts. The harvested losses offset gains dollar for dollar and up to $3,000 of ordinary income per year, with excess losses carried forward.

Practical Steps for Custodians to Stay Compliant Each Tax Season

The gap between understanding custodial account tax rules and actually filing correctly each April is where families stumble. A repeatable checklist turns the Kiddie Tax from a one-time scramble into a manageable annual routine. The steps below assume a standard custodial brokerage account generating dividends, interest, and possibly capital gains, the most common scenario for UTMA and UGMA accounts used for college savings or intergenerational wealth transfer.

Step 1: Collect the brokerage 1099

Brokerages typically issue Form 1099-DIV (dividends and capital gain distributions) and Form 1099-INT (interest) by mid-February. Some consolidate all custodial account income onto a single composite 1099. Verify that the child's Social Security number appears correctly, an incorrect SSN will cause an IRS matching failure even if the return is otherwise accurate.

If the custodian manages accounts at multiple brokerages, aggregate all 1099s before proceeding. A child with $900 in dividends at Brokerage A and $900 at Brokerage B has $1,800 in total unearned income, above the $1,300 filing threshold, even though no single 1099 exceeds it.

Step 2: Calculate total unearned income and apply the tier test

Sum all unearned income: dividends (both ordinary and qualified), interest, capital gain distributions from mutual funds or ETFs, and any realized capital gains from sales executed during the year. Apply the three-tier test:

• Total unearned income ≤ $1,300 (for 2025): no filing requirement for the child (unless other factors, such as earned income, trigger one).
• Total unearned income between $1,301 and $2,500: the child files their own return without Form 8615. Tax applies at the child's rate on the amount above $1,300.
• Total unearned income above $2,500: the child files with Form 8615, and the parent's tax information is required to compute the Tier 3 tax.

If the child also has earned income (W-2 wages from a part-time job), the filing threshold calculation changes. A dependent child with both earned and unearned income must file when earned income exceeds the standard deduction for earned income ($14,600 for 2025) or when unearned income exceeds $1,300, whichever triggers first.

Step 3: Choose the correct IRS form and file on time

If Form 8615 is required, download it from IRS.gov, complete the child's Form 1040 first, then attach Form 8615 with the parent's filing status and taxable income entered on lines 6 through 9. The form's worksheet computes the tax at the parent's rate on net unearned income. The parent must sign the child's return in the "Third Party Designee" or signature block.

If Form 8814 is the preferred route and eligibility conditions are met, attach it to the parent's Form 1040. Report the child's interest and dividends directly on the parent's Schedule B, and include the Kiddie Tax computation from Form 8814 on the parent's Form 1040 line 16.

Both paths require filing by the standard April 15 deadline (April 15, 2026, for the 2025 tax year). The child's separate return, if required, is an independent filing with its own deadline, it is not automatically extended by the parent's extension. For complex situations, multiple children with custodial accounts, significant realized capital gains, uncertain eligibility for Form 8814, consult a qualified tax professional. The IRS Publication 929 (Tax Rules for Children and Dependents) provides detailed guidance and examples for all scenarios described here.

Sources

• irs.gov
• irs.gov
• irs.gov
• irs.gov
• investopedia.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.