Who Pays Taxes on a Custodial Account, and How Much in 2026

The child pays taxes on a custodial account because the child is the legal owner and the account is registered under their Social Security number. For 2026, the first $1,350 of unearned income is tax-free, the next $1,350 is taxed at the child's own rate, and anything above $2,700 is taxed at the parent's marginal rate under the kiddie tax (IRS Topic No. 553, June 2026). Parents may elect to report the child's income on their own return via Form 8814 only if total interest, dividends, and capital gain distributions stay under $13,500.

The child pays taxes on a custodial account, not the parent. That answer confuses many families because the parent controls the account, yet the IRS treats the minor as the legal owner and taxpayer of record. The real question is how much the child owes: the 2026 kiddie tax system splits unearned income into three tiers, with anything above $2,700 taxed at the parent's marginal rate. This guide walks through every threshold, a concrete dollar example, and the most common filing mistake families make.

Comprendre les spécificités des custodial account tax rules est essentiel pour éviter les erreurs courantes et optimiser la situation fiscale.

The Short Answer: The Child Owns the Tax Liability

A custodial account belongs to the child, period. Any income it generates, dividends from ETFs, interest from bond funds, capital gain distributions from mutual funds, is the child's income for federal tax purposes. The account carries the child's Social Security number, and the custodian (usually a parent or grandparent) merely manages the assets until the minor reaches the age of majority.

This ownership structure matters because it determines every tax decision downstream: whose return the income appears on, which tax rates apply, and whether the kiddie tax triggers. The IRS treats income from a UGMA or UTMA account exactly as it treats income from any other taxable investment account, except that special rules for minors called the kiddie tax (IRC Section 1(g)) can push the effective tax rate upward.

Many families open these accounts thinking the tax treatment mirrors a parent-owned brokerage account. It does not. The custodial account tax rules create a unique hybrid where the child is the legal taxpayer but the parent's marginal rate may apply to income above a statutory threshold.

How UGMA and UTMA accounts are legally structured

Two federal laws govern these accounts: the Uniform Gifts to Minors Act (UGMA) and the Uniform Transfers to Minors Act (UTMA). UGMA accounts can hold financial assets, stocks, bonds, mutual funds, ETFs, cash, and are available in all 50 states. UTMA accounts, available in most states, can additionally hold real estate, art, and other tangible property.

Both structures share one critical legal feature: the transfer is irrevocable. Once a parent or grandparent contributes money or securities to a custodial account, those assets belong to the child. The donor cannot take them back. When the child reaches the age of majority, typically 18 or 21, depending on state law, the custodian must turn over full control. Unlike a 529 plan or Coverdell ESA where the account owner retains the right to change beneficiaries, a custodial account has exactly one beneficiary who owns it outright from day one.

Why the child's Social Security number matters for tax reporting

At account opening, the financial institution records the child's Social Security number as the taxpayer identification number. Every 1099-DIV and 1099-B issued by the brokerage reports income under that SSN. The IRS matches those forms to tax returns filed under the same number.

This means a child with enough unearned income must file their own Form 1040. There is no option to simply add the account's income to the parent's return unless the parent qualifies for and elects to use Form 8814, and that election has strict dollar limits. If unearned income exceeds the $13,500 threshold for 2026, the child must file independently and attach Form 8615 to compute the kiddie tax (IRS Topic No. 553, June 2026).

Custodial Account Tax Rules: The Three-Tier Kiddie Tax System for 2026

For 2026, the IRS divides a child's unearned income into three tiers. These dollar thresholds are not prorated: they apply to the full calendar year regardless of when the account was opened. Only unearned income, interest, dividends, capital gain distributions, and other investment income, counts here. Earned income from a job follows standard rules.

To visualize how these tiers stack, consider the following breakdown:

The kiddie tax applies to children under age 18 at year-end, plus 18-year-olds whose earned income does not exceed half of their support, and full-time students aged 19–23 under the same support test. Once the child turns 24 or stops qualifying as a full-time student, the kiddie tax no longer applies regardless of how much unearned income the account generates.

Tier 1: The tax-free floor ($1,350 in 2026)

The first $1,350 of a child's combined unearned income in 2026 incurs zero federal income tax. This exemption functions like a standard deduction for investment income. A child whose account generates $800 in dividends and nothing else owes nothing and files no return on that income alone.

Several major brokerages, including Fidelity, reference this $1,350 figure in their published 2026 custodial account guidance. The exemption covers interest from savings accounts, bond fund dividends, equity ETF distributions, and capital gain distributions from mutual funds. Short-term and long-term capital gains realized from actual sales inside the account also count as unearned income; they are not excluded from this calculation.

Tier 2: The child's own rate ($1,350 to $2,700)

The next $1,350 of unearned income, from $1,351 up to $2,700, is taxed at the child's own marginal rate. Since most children have little or no other taxable income, this usually means the 10% bracket applies to this portion. The child files their own Form 1040 reporting this income.

For a child whose only income is from the custodial account, the tax on this tier is straightforward: $1,350 × 10% = $135 in federal tax owed. If the child has earned income from a part-time job, that income may push them into a higher bracket, but moderate amounts of earned income rarely shift the calculation dramatically.

Tier 3: Parent's rate kicks in above $2,700 (the kiddie tax)

Once unearned income crosses $2,700 for 2026, everything above that line is taxed at the parent's marginal federal rate, not the child's. This is the kiddie tax in action. If the parent is in the 24% bracket, every dollar of unearned income above $2,700 gets taxed at 24%. If the parent sits in the 35% bracket, that rate applies.

This mechanism was designed to prevent high-income parents from shifting investment assets to their children to exploit the child's lower tax bracket. The child remains the taxpayer, the Form 1040 still carries the child's name and SSN, but the rate applied to the excess income is the parent's top marginal rate.

Which IRS form triggers the kiddie tax: Form 8615

When the child's total unearned income exceeds $2,700 and the child is subject to the kiddie tax, the filing requirement includes Form 8615: "Tax for Certain Children Who Have Unearned Income." This form calculates the tax on the excess amount at the parent's rate. It requires the parent's taxable income and filing status to determine the applicable bracket.

If the parents are divorced or separated, the custodial parent's tax information is used. If the custodial parent has remarried and files jointly with the new spouse, that joint return's taxable income determines the rate. The form is filed as an attachment to the child's own Form 1040, it is never attached to the parent's return.

Worked Example: What a Family Actually Owes (2026 Numbers)

A concrete example makes the three-tier system tangible. Consider a 14-year-old whose grandparents funded a UGMA account years ago. The account now holds $50,000 in a diversified ETF portfolio. During 2026, that portfolio generates $3,200 in combined dividends and capital gain distributions. The child has no earned income.

Here is how the tax obligation breaks down, step by step.

• Total unearned income: $3,200 (all from dividends and capital gain distributions reported on Form 1099-DIV)
• Tier 1 (tax-free): The first $1,350 is exempt. Remaining income after Tier 1: $1,850.
• Tier 2 (child's rate): The next $1,350 is taxed at 10% (the child's marginal rate). Tax owed: $135.
• Tier 3 (kiddie tax): The remaining $500 ($3,200 − $2,700) is taxed at the parent's marginal rate. If the parents file jointly and fall in the 24% bracket, tax owed: $120.
• Total federal tax: $135 + $120 = $255.

Without the kiddie tax, all $1,850 above the exemption would be taxed at the child's 10% rate, producing a $185 tax bill. The kiddie tax adds $70 because $500 gets taxed at 24% instead of 10%. This is the core effect of the rule.

Crypto-asset ETFs held inside a UGMA follow identical unearned-income treatment. If the account holds a spot Bitcoin ETF and that fund distributes capital gains or the custodian sells shares, the resulting gains flow through the same three tiers. No special crypto loophole exists for custodial accounts. Individual results vary based on the parent's bracket, the child's other income, and the composition of the portfolio; a CPA should be consulted before relying on any specific estimate.

Step 1: Identify the child's total unearned income

Start with every 1099-DIV and 1099-B the brokerage issued for the child's account during 2026. Add up ordinary dividends, qualified dividends, capital gain distributions, and interest. Include any realized capital gains from sales made by the custodian during the year. The total is the child's unearned income for the tax year.

Step 2: Apply the three tiers

Apply the three tiers mechanically. The first $1,350 is tax-free. The next $1,350 (from $1,351 to $2,700) gets taxed at the child's own rate, typically 10% for children with minimal other income. Everything above $2,700 gets taxed at the parent's marginal rate via Form 8615.

Step 3: Determine which portion parents report on Form 8615

If the child's unearned income exceeds $2,700 and the child is under 18 (or 18–23 and a full-time student meeting the support test), the parent's tax information goes on Form 8615, attached to the child's Form 1040. If total interest, dividends, and capital gain distributions stay under $13,500 for 2026, the parent may instead elect to report all of it on their own return using Form 8814, avoiding a separate child filing. Above $13,500, the separate child return with Form 8615 is mandatory (IRS Topic No. 553, June 2026).

Who Pays Capital Gains Tax on Custodial Accounts?

Capital gains realized from sales inside a custodial account are treated as unearned income and flow through the same three-tier kiddie tax system. Whether the gain comes from selling Apple stock bought five years ago or a Bitcoin ETF liquidated after six months, the tax rules do not change: the gain is part of the child's unearned income total for the year.

The distinction that does matter is cost basis. When a donor transfers appreciated securities into a custodial account, the child inherits the donor's original cost basis and holding period. If a grandparent contributed shares of a mutual fund purchased at $30 per share in 2018, the child's basis is $30, not the market value on the date of transfer. When the custodian later sells those shares at $50, the $20 per-share gain is taxable to the child.

This basis-tracing rule can produce large realized gains when a well-meaning relative transfers long-held appreciated stock into a UGMA. The donor avoids capital gains tax on the transfer (it is a gift, not a sale), but the child, or effectively the parent via the kiddie tax, bears the tax when the position is eventually sold.

How cost basis transfers from donor to child

The IRS rule is straightforward: the recipient of a gifted security takes the donor's adjusted basis. For a custodial account, the child is the recipient. The brokerage is not required to track this basis correctly, the custodian or the family's tax preparer must maintain records of the original acquisition date and price.

If the donor's basis cannot be documented, the IRS defaults to a zero basis, meaning the entire sales proceeds are treated as a gain. Families funding custodial accounts with appreciated stock should keep a written record of the date, purchase price, and number of shares transferred. A simple spreadsheet entry at the time of contribution avoids a costly basis dispute years later.

Long-term vs. short-term capital gains inside a UGMA/UTMA

The holding period for gifted securities includes the donor's holding period. If the donor held the stock for three years before transferring it into the UGMA, and the custodian sells it one year later, the total holding period is four years, qualifying for long-term capital gain rates (0%, 15%, or 20% depending on the child's or parent's applicable bracket under the kiddie tax).

Short-term gains, those on assets held one year or less in total, are taxed as ordinary income. Within the kiddie tax framework, short-term gains falling above the $2,700 threshold are taxed at the parent's ordinary-income marginal rate, which can reach 37%. Long-term gains above the threshold are taxed at the parent's long-term capital gains rate, typically 15% or 20%. This difference can be substantial and is one reason custodians often favor long-term buy-and-hold strategies inside UGMA/UTMA accounts.

The Gift Tax Side: When Contributions Trigger Reporting

Every dollar contributed to a custodial account is an irrevocable gift to the child. The IRS treats UGMA and UTMA contributions as completed gifts at the moment of transfer, and gift tax rules apply, though actual gift tax liability is rare for most families.

For 2026, each donor can give up to $19,000 per child per year without triggering any gift tax reporting requirement (IRS Estate and Gift Tax FAQs, May 2026). A married couple can together give $38,000 per child per year by splitting the gift. Contributions below this annual exclusion amount require no filing and count zero against the donor's lifetime estate and gift tax exemption.

The $19,000 annual exclusion per child (2026)

The $19,000 figure for 2026 represents a $1,000 increase from the 2025 level of $18,000, reflecting the IRS inflation adjustment. A parent who contributes $15,000 to a child's UGMA in 2026 does nothing beyond writing the check: no gift tax return, no impact on the lifetime exemption, no tax consequence of any kind.

Contributions between $19,001 and the lifetime exemption amount ($13.99 million per individual for 2026) require filing IRS Form 709 but generally produce no immediate tax. The donor simply reports the excess over $19,000, and that excess reduces the donor's remaining lifetime exemption dollar for dollar. Only once cumulative taxable gifts exceed the lifetime exemption does actual gift tax at a top rate of 40% become payable.

What happens if a grandparent contributes more than $19,000

Suppose a grandparent contributes $30,000 to a grandchild's UTMA account in 2026. The first $19,000 is covered by the annual exclusion. The remaining $11,000 is a taxable gift that must be reported on Form 709 by April 15 of the following year.

That $11,000 reduces the grandparent's lifetime exemption by the same amount, but no gift tax check is written unless the grandparent has already exhausted the $13.99 million lifetime exemption through prior gifts. For the vast majority of families, the Form 709 filing is an administrative step with zero out-of-pocket tax. Still, it is a step many families overlook, and the IRS can assess penalties for late-filed gift tax returns even when no tax is due.

The Most Common Mistake: Assuming the Parent's Return Covers Everything

The single most frequent error families make with custodial accounts is assuming that because the parent manages the money, all the income belongs on the parent's Form 1040. This assumption breaks in two distinct ways, and both carry consequences.

First scenario: the parent files nothing for the child. The child's unearned income exceeds the filing threshold (generally $1,350 for 2026 if the child has no earned income), but no separate return is filed. The IRS receives 1099-DIV and 1099-B forms under the child's SSN with no matching return. This triggers a CP2000 notice proposing additional tax, plus interest and potentially failure-to-file penalties.

Second scenario: the parent uses Form 8814 incorrectly. Form 8814 lets a parent elect to report the child's income on their own return, but only if the child's total income consists solely of interest, dividends, and capital gain distributions and totals less than $13,500 for 2026 (IRS Topic No. 553, June 2026). If income exceeds $13,500, or if the account realized capital gains from actual sales (not just distributions), Form 8814 is not available and the child must file independently using Form 8615.

Form 8814 vs. Form 8615: which one applies to your situation

These two forms serve different paths and are mutually exclusive for a given tax year.

• Form 8814 (Parent's Election to Report Child's Interest and Dividends): The parent adds the child's income to their own return. Available only when the child's income is under $13,500 for 2026 and consists entirely of interest, dividends, and capital gain distributions (no realized capital gains from sales, no earned income). Using this form means the child files no separate return.
• Form 8615 (Tax for Certain Children Who Have Unearned Income): Attached to the child's own Form 1040. Required when unearned income exceeds $2,700 and the child meets the kiddie tax age criteria. This form computes the tax on the excess at the parent's rate.

The parent cannot choose Form 8615 to avoid filing a child return; Form 8615 is always an attachment to the child's 1040. If the child's income exceeds $13,500, Form 8814 is off the table entirely.

What the $13,500 threshold means for the parent-election option

The $13,500 threshold for 2026 is not a kiddie tax threshold, it is a filing convenience threshold. When the child's only income is interest, dividends, and capital gain distributions, and the total stays under $13,500, the parent may elect to include all of it on their own Form 1040 via Form 8814.

Cross $13,501, and the child must file a separate return. This separate return will trigger Form 8615 if unearned income also exceeds $2,700. The two thresholds operate independently: $2,700 determines whether the kiddie tax rate applies; $13,500 determines whether the parent can use the simplified reporting option. A child with $8,000 in dividend income will pay kiddie tax on $5,300 of it, but the parent can still use Form 8814 to avoid a separate filing.

Custodial Accounts vs. 529 Plans and Coverdell ESAs: Tax Comparison

UGMA/UTMA custodial accounts are not education-specific vehicles. They compete for family savings dollars with dedicated education accounts that carry different tax profiles. Understanding these differences before funding a custodial account avoids regrets later.

529 plan earnings are not subject to federal tax when withdrawn for qualified education expenses including tuition, fees, books, and room and board (IRS, January 2026). Custodial accounts offer no such tax-free growth. The trade is flexibility: custodial account funds can be used for a first car, a summer program, or a down payment on a first home, uses a 529 plan penalizes.

When and How to Actually Pay Taxes on a Custodial Account

Filing season for custodial account taxes follows the standard individual income tax calendar. The brokerage that holds the UGMA or UTMA account issues tax forms in late January or early February each year.

The custodian receives these documents, but they report income under the child's name and SSN. The custodian's job is to provide them to whoever prepares the child's tax return, or to the family's CPA, and to determine which filing path applies: Form 8814 on the parent's return, or a separate Form 1040 with Form 8615 for the child.

A child who must file independently needs their own taxpayer account with the IRS. The return is due April 15, 2027, for the 2026 tax year, with the same extension options available as for adult filers. Electronic filing is available for child returns through most tax software, though Form 8615 may require a paid tier of TurboTax or H&R Block.

One piece of good news: withdrawing money from a custodial account is generally not a taxable event. The tax obligation arises when the income is recognized, dividends paid, interest credited, capital gains realized, not when cash is transferred out. The custodian can withdraw funds for the child's benefit (summer camp tuition, a laptop) without triggering a separate tax on the withdrawal itself. The underlying income was already taxed in the year it was earned.

Documents you'll receive: 1099-DIV and 1099-B

Each January, the brokerage mails or posts electronically:

• Form 1099-DIV: Reports ordinary dividends, qualified dividends, and capital gain distributions paid to the account during the prior year.
• Form 1099-B: Reports proceeds from any sales of securities (stocks, ETFs, mutual funds) executed during the prior year. This form includes the date of sale and gross proceeds, but it rarely includes the correct cost basis for gifted securities, the family must supply that from its own records.
• Form 1099-INT: Reports interest income if the account held cash sweep vehicles, money market funds, or bonds that paid interest.

If the account generated any realized capital gains from sales, the custodian needs to reconcile Form 1099-B against the original cost basis records to compute the actual gain or loss to report.

Withdrawals from a custodial account: are they taxable?

The act of withdrawing cash or transferring securities out of a custodial account for the child's use does not create a new taxable event. The tax consequences occurred when the account earned the income, not when the money is spent.

There are restrictions on how withdrawals must be used: the custodian has a fiduciary duty to spend the funds for the child's benefit. Buying the child a gaming PC or paying for music lessons qualifies. Using custodial account funds to pay the parent's mortgage does not. The age-of-majority rules also apply: once the child reaches the termination age under state law (18 or 21 for most states), the custodian must transfer all remaining assets to the now-adult beneficiary. The beneficiary can then withdraw or reinvest freely, and the kiddie tax stops applying once they age out.

Key points

• The child is always the legal taxpayer on UGMA/UTMA custodial account income because the account is registered under the child's Social Security number.
• For 2026, the first $1,350 of a child's unearned income is tax-free, the next $1,350 is taxed at the child's own rate, and anything above $2,700 is taxed at the parent's marginal rate (IRS Topic No. 553).
• Parents can elect to report the child's income on their own return using Form 8814 only if total interest, dividends, and capital gain distributions stay under $13,500 for 2026.
• Capital gains realized inside a custodial account follow the same three-tier kiddie tax system, and the child inherits the donor's original cost basis.
• Custodial account contributions are irrevocable gifts: gifts exceeding $19,000 per child per donor in 2026 may require filing Form 709 (IRS Estate and Gift Tax FAQs, May 2026).

Sources

• irs.gov
• irs.gov
• irs.gov
• 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.