Kiddie Tax Form 8615: How Investment Income for Children Under 24 Is Taxed at Parent Rates

You opened a custodial brokerage account for your daughter when she was born. Fifteen years and a generous market later, the account holds a six-figure balance generating thousands of dollars in dividends and capital gains every year. You assumed those earnings would be taxed at your child's rate—after all, the account is in her name and Social Security number.

You assumed wrong.

Under the federal "kiddie tax," much of your child's investment income is taxed at your marginal rate, not hers. A 24-year-old graduate student living on a stipend and dividends from inherited stock can owe federal income tax at her parents' 32% bracket, even though her own taxable income would otherwise sit firmly in the 12% range. The rule has tripped up generations of well-meaning parents and grandparents, and it routinely surprises families during their first encounter with Form 8615.

This guide explains how the kiddie tax actually works, who it applies to, the 2026 thresholds, the strategic planning moves that legally minimize the bite, and the most common mistakes families make with UTMA, UGMA, and brokerage accounts opened in a child's name.

What the Kiddie Tax Is and Why It Exists

Before 1986, high-income parents had a simple way to slash their family tax bill: open custodial accounts in their children's names, transfer income-producing assets, and let the dividends, interest, and capital gains be taxed at the child's much lower rate. A toddler in the lowest tax bracket could shelter thousands of dollars of investment income that would otherwise have been taxed at the parents' top rate.

Congress closed that loophole in the Tax Reform Act of 1986 by creating what is now informally called the "kiddie tax." The rule does not prevent parents from giving assets to children, and it does not change who legally owns the account. What it changes is the tax rate applied to a child's unearned income above a modest threshold. Above that line, the IRS treats the income as if it had been earned by the parents and taxes it at their marginal bracket.

The mechanics live on IRS Form 8615, "Tax for Certain Children Who Have Unearned Income." Most families discover the form the first time their custodial account throws off enough dividends or capital gains to cross the threshold—often during a strong market year, an unexpected mutual fund distribution, or after a grandparent's gift.

Who the Kiddie Tax Applies To

Not every child with investment income gets caught. The kiddie tax applies only when all of the following are true:

1. The child has more than the threshold amount of unearned income. For 2026, that threshold is $2,700.
2. The child meets one of the age tests:
   • Under age 18 at year-end, or
   • Age 18 at year-end with earned income that was not more than half of the child's support, or
   • A full-time student aged 19 through 23 with earned income that was not more than half of the child's support.
3. At least one parent is alive at year-end.
4. The child does not file a joint return.
5. The child is required to file a tax return.

The full-time-student extension is the trap most families miss. A 23-year-old college senior or graduate student living mostly on parental support and scholarships—even one with a part-time job—usually qualifies. Many parents assume the kiddie tax ends at 18 and are blindsided when their college student's brokerage account triggers it.

A few important nuances:

• "Earned income" means wages, salaries, tips, and self-employment income. Investment dividends, interest, capital gains, and trust distributions are unearned.
• "Support" includes lodging, food, transportation, education, medical care, and recreation. A full-time student living rent-free in their parents' house, with tuition paid by the parents, almost always fails the half-support test even with a substantial summer-job wage.
• Married children who file jointly with a spouse are exempt from the kiddie tax, but only because filing jointly disqualifies them under criterion #4.
• Children who are orphans (no living parent) are exempt because criterion #3 fails.

The 2026 Three-Tier Tax Structure

The kiddie tax creates a three-tier system for a child's unearned income:

Unearned Income	Tax Treatment
First $1,350	Tax-free (offset by the dependent's standard deduction)
Next $1,350 (up to $2,700 total)	Taxed at the child's marginal rate (typically 10%)
Above $2,700	Taxed at the parent's marginal rate

So if your 12-year-old's UTMA account generates $4,500 of dividends and capital gain distributions in 2026:

• $1,350 is sheltered by the standard deduction.
• $1,350 is taxed at the child's 10% rate, costing $135.
• $1,800 is taxed at the parent's marginal rate. If the parents are in the 24% bracket, that adds $432.
• Total federal tax: $567.

If the same $4,500 had been earned in the parent's account at the 24% rate, the tax would have been $1,080—so the kiddie tax structure still saves money compared to fully taxing the income at parent rates. But the savings are far smaller than parents typically assume, especially once accounts grow large enough that most of the income falls into the parent-rate tier.

A historical note worth remembering: from 2018 through 2019, the Tax Cuts and Jobs Act briefly applied trust-and-estate tax rates (which compress to 37% above roughly $13,000) to the kiddie tax. The change devastated Gold Star military families whose children received survivor benefits classified as unearned income. Congress reversed the change in the SECURE Act of 2019, restoring parent rates retroactively. Today the kiddie tax is back to using the parent's marginal rate.

What Counts as Unearned Income

The kiddie tax casts a wide net. Unearned income includes:

• Interest from savings accounts, CDs, and bonds
• Ordinary dividends from stocks and mutual funds
• Qualified dividends (taxed at capital-gain rates, but still subject to the kiddie tax structure)
• Capital gains, both short-term and long-term, including distributions from mutual funds and ETFs
• Rental and royalty income
• Taxable Social Security and pension income (uncommon for children, but possible)
• Income from trusts, including survivor benefits and certain inherited IRA distributions
• The taxable portion of scholarships that exceed qualified education expenses

Note especially that long-term capital gains and qualified dividends are subject to the kiddie tax even though they enjoy preferential rates. A long-term gain that would otherwise be taxed at 0% (because the child's income is low) can be pushed into a 15% or 20% bracket once the parent's rate kicks in.

Form 8814: When Parents Can Pull Income onto Their Own Return

Filing a separate return for a child every year is administratively painful. The IRS provides an alternative: Form 8814, "Parent's Election to Report Child's Interest and Dividends." Parents can elect to skip the child's return and report the child's investment income directly on their own Form 1040.

The election is available only if all of the following are true:

• The child is under age 19 (or under 24 if a full-time student).
• The child's gross income is less than $13,500 for 2026.
• The income consists only of interest, dividends, and capital gain distributions.
• No estimated tax payments were made for the child.
• No backup withholding was applied.
• The child does not file a joint return.

Form 8814 is convenient but rarely the optimal choice. Two reasons:

1. Income reported on the parent's return increases the parents' AGI, which can phase out deductions, credits, IRA contributions, and trigger the 3.8% Net Investment Income Tax.
2. The child loses access to her own standard deduction. The first $1,350 of the child's unearned income that would have been tax-free on the child's return becomes taxable on the parent's return (with a small offset).

For families whose children have only small amounts of dividend and interest income, Form 8814 saves filing fees and headaches. For families with larger custodial balances, filing a separate return for the child usually costs less in the end.

Common Mistakes Families Make

After two decades of advising families on custodial accounts, the same handful of mistakes show up over and over.

Mistake 1: Forgetting that the kiddie tax follows full-time students through age 23

The most expensive surprise. Parents who funded a 529 or UTMA generously assume the kiddie tax ends at 18 and watch their college senior's portfolio generate tax bills priced at the parents' bracket.

Mistake 2: Triggering avoidable capital gains in a single year

Custodial accounts often hold long-held positions with significant unrealized gains. Selling everything in one year to fund tuition can crystallize tens of thousands of dollars of capital gains—almost all taxed at the parents' rate. Spreading sales across multiple tax years, harvesting losses in offsetting trades, and timing redemptions for years when the parents are in a lower bracket all reduce the bite.

Mistake 3: Confusing UGMA/UTMA accounts with 529 plans

UGMA and UTMA balances are owned by the child and trigger the kiddie tax annually. 529 plans grow tax-deferred and are tax-free when used for qualified education expenses, with no kiddie-tax exposure. Many parents conflate the two and assume their custodial brokerage gets 529-style treatment. It does not.

Mistake 4: Ignoring the financial-aid impact

UGMA/UTMA assets are reported as the child's assets on the FAFSA and assessed at 20%, while parent-owned assets are assessed at a maximum of 5.64%. A $50,000 UGMA can reduce financial aid eligibility by roughly $10,000 per year compared to the same money held in a parent's name. The tax-rate-shifting benefit of the custodial account is often dwarfed by the aid penalty.

Mistake 5: Using custodial account funds for parental obligations

UGMA and UTMA assets legally belong to the child and must be used for the child's benefit. Parents who tap the account to pay routine household expenses—food, shelter, basic clothing that they are legally obligated to provide—create both a tax problem and a fiduciary one. Custodial funds spent on summer camp, music lessons, a first car, or college are clearly for the child's benefit. Funds used to pay the family mortgage are not.

Mistake 6: Forgetting that Form 8615 requires the parents' tax information

Filing Form 8615 requires the parents' filing status, taxable income, and tax liability. If parents are divorced, the form uses the custodial parent's data. If parents are married filing separately, it uses whichever parent has higher taxable income. Children of divorced or estranged parents sometimes cannot complete the form because they cannot get the necessary information from a parent.

Strategies to Legally Minimize the Kiddie Tax

The cleanest strategies all share a single principle: keep the child's annual unearned income at or below the $2,700 threshold and use the standard deduction and child's-rate tier productively.

Hold growth-oriented, low-distribution investments

Index funds and ETFs that distribute few dividends and have low turnover can grow for years without throwing off enough income to trigger the kiddie tax. Reserve dividend-paying stocks, bond funds, and high-turnover mutual funds for parent-owned accounts where the rate is already at the parents' bracket.

Realize gains in low-income years for the child

If your college student takes a gap year with no wages, that may be the optimal year to harvest accumulated gains in the custodial account. The gain still triggers Form 8615, but the absence of other income gives more room before the parent-rate tier applies, and it locks in a higher cost basis for future sales.

Front-load Roth IRA contributions when the child has earned income

A child with summer-job wages can contribute up to the lesser of earned income or the annual Roth IRA limit ($7,000 in 2026). Income earned inside a Roth IRA is not unearned income for kiddie-tax purposes and grows tax-free for life. For a teenager with even a modest job, this is one of the most powerful long-term tax-shielding moves available.

Use 529 plans for college savings

Earnings inside a 529 plan are not unearned income and are not subject to the kiddie tax at all. Distributions for qualified education expenses are tax-free at the federal level. A 529 also offers FAFSA treatment that is significantly more favorable than UGMA/UTMA.

Time UTMA-to-Roth conversions when the child starts working

If a child has earned income, a custodial Roth IRA can be funded with money the child already owns in a UTMA account (subject to the wage cap). This converts a kiddie-tax-exposed pool into a tax-free retirement pool for the child. Coordinate with a CPA to avoid gift-tax pitfalls.

Coordinate with the kiddie tax on Series I Bonds

Series I Bonds in a child's name accrue interest tax-deferred until redemption. Parents sometimes plan to redeem them all in the year tuition is due, only to discover a five-figure tax bill at the parents' rate. Annual partial redemptions, kept under the threshold, smooth the tax over time.

Filing Logistics and Deadlines

Form 8615 is filed with the child's tax return, not the parents'. The child files Form 1040 with Schedule B (if interest and dividends exceed $1,500) and attaches Form 8615. The form requires:

• The child's investment income and applicable deductions
• The parents' filing status, taxable income, and total tax
• A computation of "tax based on the parent's rate"

The child's return follows the same filing deadlines as adult returns—April 15 for calendar-year filers, with an extension available via Form 4868 (filed by a parent or guardian on the child's behalf).

If the parents have not yet filed their own return when the child's return is due, the child's tax can be calculated using the parents' estimated taxable income, with a Form 1040-X amended return filed once the parents' actual numbers are final.

Recordkeeping: The Foundation of Every Strategy

Every kiddie-tax strategy depends on accurate records. You need:

• Annual broker statements (Form 1099-DIV, 1099-INT, 1099-B) for every custodial account
• Cost basis information for every position, including reinvested dividends
• A multi-year ledger of which gains have already been realized and which losses are still available
• The child's earned-income records (W-2s, 1099-NECs) to confirm support and dependency status
• The parents' completed tax returns for use on Form 8615

Families who try to reconstruct fifteen years of UTMA cost basis in the spring before college starts almost always lose money to careless realization sequencing. Families who keep clean records year after year have the information they need to make small, optimal moves every tax year and to coordinate the custodial account with parent-side planning.

This is exactly where plain-text accounting earns its keep. A version-controlled ledger of every contribution, dividend, distribution, sale, and basis adjustment gives you a queryable, auditable, decade-spanning record—no proprietary software, no lock-in, and no scrambling to reconstruct history when it matters.

Keep Your Family's Investment Records Organized for Decades

Whether you are managing a custodial UTMA, a 529 plan, a child's Roth IRA, or a family-wide brokerage strategy, accurate multi-year records are what turn the kiddie tax from an annual surprise into a managed line item. Beancount.io provides plain-text accounting that gives you complete transparency and version-controlled history over your family's financial data—no black boxes, no vendor lock-in, no hunting through old broker portals when your child's first Form 8615 is due. Get started for free and see why families and financial professionals are switching to plain-text accounting.