The Kiddie Tax Trap: What High-Earning Parents Need to Know Before Shifting Income to Children

Opening a UGMA for your child and buying dividend-paying stocks inside it feels like a smart move. The income gets taxed at the kid's rate, not yours. Except, for most high-earning families with children under 24, that's not how it works.

The kiddie tax, codified under IRC §1(g), exists precisely to close that door. Congress designed it to prevent parents from parking investment assets in a child's name to access lower brackets. Unearned income above a modest annual threshold is taxed at the parent's marginal rate, not the child's.

How the Threshold Works in Practice

For 2026, the first roughly $1,300 of a child's unearned income is tax-free, and the next roughly $1,300 is taxed at the child's own rate. Everything above that is taxed at the parent's top marginal rate.

Labeled illustrative example: a client's 16-year-old holds a UGMA account generating $8,000 in qualified dividends in 2026. The parent is in the 37% federal bracket.

• Approximately $1,300: no tax
• Approximately $1,300: taxed at the child's rate (likely 0% on qualified dividends)
• Remaining $5,400: taxed at the parent's rate

The account is in the child's name; the tax burden is not.

Which Income Is Caught and Which Isn't

Unearned income subject to the kiddie tax includes dividends, interest, capital gains distributions, and UGMA or UTMA account distributions. Earned income from a real job the child actually works is not subject to the kiddie tax.

529 distributions used for qualified education expenses are not taxable at all, which is why 529s remain a clean vehicle for college savings regardless of a parent's bracket. The kiddie tax issue is specific to taxable custodial accounts generating investment income.

When Income-Shifting Actually Works

The kiddie tax applies through age 18 for all children, and extends through age 23 for full-time students who do not have earned income exceeding their own support costs. Once a child is no longer a full-time student, or turns 24, the kiddie tax falls away. At that point, gifting appreciated securities or income-producing assets becomes a legitimate planning lever.

The mistake I see most often is not a bad intention, it's a wrong assumption about timing. Parents fund UGMAs when children are young, expecting lower tax rates for years. What they get instead is the parent's rate for most of that window and, eventually, an irrevocable account the child controls completely at age 18 or 21 depending on state law.

The Takeaway

The one fact that changes everything here is the child's age and student status. Whether income-shifting makes sense, and which vehicle to use, turns entirely on that. Done in the wrong account at the wrong stage of a child's life, it costs more in taxes than it saves. This is the kind of detail that belongs in the Soil layer of a plan, where the structure is set before the assets move.

If your family is in a high bracket and you're planning around education funding or generational transfer, that's a conversation worth having before the assets are already in a custodial account.

The information provided is for educational purposes only and does not constitute investment, legal, or tax advice. Consult with qualified professionals for guidance specific to your situation.