What Is the Kiddie Tax?

The Kiddie Tax is a U.S. tax rule designed to prevent parents from shifting investment income to their children to take advantage of lower tax rates. It applies to unearned income, such as interest, dividends, and capital gains, that a child receives from investments. Instead of being taxed at the child’s typically lower tax rate, a portion of this income is taxed at the parents’ marginal tax rate, reducing the potential tax benefit of transferring assets to minors.

How the Kiddie Tax Works

The Kiddie Tax applies to children under the age of 18, as well as full-time students between 19 and 23 who do not provide more than half of their own financial support. The tax kicks in when a child’s unearned income exceeds a certain threshold, which is adjusted annually for inflation. For 2025, the threshold is $2,700. The first $1,350 of unearned income is tax-free due to the standard deduction for dependents, while the next $1,350 is taxed at the child’s tax rate. Any unearned income beyond this amount is taxed at the parent’s rate.

The tax was introduced under the Tax Reform Act of 1986 as a way to close a loophole where parents transferred income-generating assets, such as stocks or bonds, to their children to take advantage of the lower tax brackets. Without this rule, families could significantly reduce their tax liability by distributing investment income among multiple family members who fell into lower tax brackets.

Income Subject to the Kiddie Tax

The Kiddie Tax applies only to unearned income. Earned income — such as wages from a job — is not affected and continues to be taxed at the child’s own rate. The types of income that typically fall under this tax rule include:

• Interest from savings accounts or bonds
• Dividends from stocks and mutual funds
• Capital gains from the sale of investments
• Income from trusts, estates, and certain business arrangements

If a child’s unearned income is derived from a custodial account, such as a UGMA (Uniform Gifts to Minors Act) or UTMA (Uniform Transfers to Minors Act) account, the Kiddie Tax may apply once income exceeds the set threshold.

Filing Requirements and Tax Reporting

When a child has unearned income above the filing threshold, they must file their own tax return (Form 1040). In cases where the income is below a certain limit, parents may have the option to include the child’s unearned income on their own return using Form 8814 (Parents’ Election to Report Child’s Interest and Dividends) instead of filing a separate return for the child. However, this option is only available if the child’s total unearned income does not exceed $13,000 (for tax year 2024).

If parents choose this route, the child’s income is added to theirs and taxed accordingly. This can sometimes simplify tax filing but may result in a higher overall tax burden depending on the parents’ income level.

Exceptions and Exemptions

The Kiddie Tax does not apply to all children. If a child is over 18 and financially independent, meaning they provide more than half of their own support, they are taxed at their own rates. Similarly, once a child turns 24, the Kiddie Tax no longer applies, regardless of dependency status.

The tax also does not apply to qualified distributions from certain tax-advantaged accounts, such as 529 college savings plans or Coverdell education savings accounts. These accounts grow tax-free when used for education expenses, making them a strategic way to save for a child’s future without triggering Kiddie Tax rules.

Planning Strategies to Minimize Kiddie Tax

While the Kiddie Tax limits the ability to shift investment income to children, there are strategies families can use to reduce its impact:

• Investing in Tax-Efficient Accounts: Contributing to 529 plans, Roth IRAs for minors, or custodial IRAs can allow money to grow tax-free or be withdrawn tax-free under certain conditions.
• Using Growth-Oriented Investments: Rather than generating immediate taxable income, investments that focus on long-term capital appreciation, such as growth stocks or tax-efficient mutual funds, can defer taxable gains until the child is no longer subject to the Kiddie Tax.
• Timing Asset Transfers: Gifting appreciated assets to children after they turn 24 can allow them to take advantage of lower capital gains tax rates without being impacted by the Kiddie Tax.
• Considering Tax-Exempt Bonds: Municipal bonds generate interest income that is tax-exempt, avoiding the Kiddie Tax altogether.

Parents should consult with a tax professional to determine the best strategy based on their financial situation.

Changes and Legislative Adjustments

The Kiddie Tax rules have undergone changes over the years. Under the Tax Cuts and Jobs Act (TCJA) of 2017, the tax was temporarily calculated based on the tax rates applied to estates and trusts, which could result in significantly higher taxes in some cases. However, the SECURE Act of 2019 reversed this change, returning the calculation to the parents’ tax rate. This correction ensured that affected families did not face an unintended tax burden.

The Bottom Line

The Kiddie Tax prevents parents from using their children’s lower tax rates to shelter unearned income from higher taxation. While it primarily affects families with investment income, there are ways to manage its impact through careful planning. Understanding how the Kiddie Tax works can help families make informed decisions about investment strategies and financial planning for their children’s future. Consulting with a tax professional is often advisable to navigate the complexities of this tax rule and optimize financial outcomes.