Glossary term
Kiddie Tax
The kiddie tax is a federal tax rule that can tax a child's unearned income above an annual threshold at the parents' tax rate.
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What Is the Kiddie Tax?
The kiddie tax is a federal tax rule that can tax a child's unearned income above an annual threshold at the parents' tax rate. It is designed to reduce the benefit of shifting investment income to children who otherwise might be taxed at lower rates.
Unearned income can include interest, dividends, capital gains, taxable scholarships in certain cases, and other investment-type income. The rule is technical because it depends on the child's age, student status, support, filing requirements, and the amount of unearned income.
Key Takeaways
- The kiddie tax applies to certain children with unearned income above an annual threshold.
- Income above the threshold can be taxed using the parents' tax rate.
- Earned income from a job is treated differently from unearned investment income.
- The rule is reported on Form 8615 when required.
- Thresholds can change, so current-year IRS guidance matters.
How It Works
The kiddie tax does not mean all of a child's income is taxed at the parents' rate. The rule focuses on net unearned income above the applicable threshold. Some unearned income may be sheltered by the child's standard deduction or taxed at the child's rate before the parents' rate applies.
For example, a child with a small amount of bank interest may not be affected. A child with a large taxable brokerage account, trust distribution, or realized capital gain may be. Parents and custodians should check the current Form 8615 rules before realizing gains in an account owned by a child.
A simple way to think about the rule is sequencing. First, determine whether the child has unearned income and whether the age and support tests bring the child under the rule. Then apply the current-year threshold. Only the portion that falls under the kiddie tax calculation is pulled into the parent-rate framework.
Where Families Encounter It
The kiddie tax often appears with custodial accounts, inherited assets, trust distributions, investment accounts opened for minors, or family wealth-transfer strategies. It can also surprise families when a child sells appreciated stock or receives taxable investment income.
The rule does not eliminate the value of saving or investing for a child. It changes the tax math. Account type, ownership, timing of gains, education planning, and financial-aid effects may all matter.
Earned Income Versus Investment Income
The distinction between earned and unearned income is central. Wages from a summer job generally belong in the child's own earned-income tax picture. Dividends, interest, capital gains, and certain other investment returns are the items more likely to raise kiddie-tax questions.
That distinction can affect planning choices. A custodial brokerage account, a trust distribution, a Roth IRA funded with a child's legitimate earned income, and a 529 plan all carry different tax and ownership consequences. The kiddie tax is one lens, not the entire decision.
Planning Watchpoints
Because the kiddie tax uses annual thresholds, glossary readers should not rely on a stale dollar amount. The framework is more durable: identify the child's unearned income, determine whether Form 8615 applies, and calculate how much is taxed at the parent's rate.
Families using custodial accounts should also remember that assets in the child's name are legally the child's assets. Tax treatment is only one part of the planning decision. Control, financial aid, gifting strategy, and the child's eventual access to the money can matter just as much. A move that saves tax today can still be a poor fit if it gives up too much flexibility later.
The Bottom Line
The kiddie tax limits the tax benefit of shifting investment income to children. It matters whenever a child has meaningful unearned income, especially from custodial accounts, trusts, or realized capital gains.