Kiddie Tax

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Tax rule preventing income shifting by taxing a child's unearned income above $2,700 at the parent's marginal tax rate instead of the child's lower rate. Applies through age 18 (or through age 23 if a full-time student). Only affects unearned income such as dividends, interest, and capital gains from custodial accounts (UGMA/UTMA), not earned income from employment.

Example

A 16-year-old has $8,000 in dividend income from a UGMA account and $3,000 in wages from a part-time job. The first $2,700 of unearned income is taxed at the child's rate (10%), but the remaining $5,700 of dividends ($8,000 - $2,700) is taxed at the parents' marginal rate (32% bracket). The $3,000 in W-2 wages is always taxed at the child's rate because the kiddie tax only applies to unearned income.

Common Confusion

Students often believe the kiddie tax applies to all income, but it only affects unearned income (dividends, interest, capital gains). Earned income from a job is always taxed at the child's lower rate. Another confusion: the age cutoffs. The rule applies through age 18, or through age 23 if the child is a full-time student. At age 24, the kiddie tax no longer applies regardless of student status.

How This Is Tested

  • Calculating kiddie tax on UGMA/UTMA account unearned income above the $2,700 threshold
  • Identifying which types of income are subject to kiddie tax (unearned only: dividends, interest, capital gains) versus exempt (W-2 wages)
  • Determining if a child qualifies for kiddie tax based on age (through age 18, or through age 23 if full-time student)
  • Understanding that the parent's marginal rate applies only to the unearned income exceeding the threshold, not all income
  • Recognizing kiddie tax as a reason custodial accounts may be less tax-efficient than 529 plans for high-balance education savings

Regulatory Limits

Description Limit Notes
Unearned income threshold (2026) $2,700 annually Unearned income below this amount taxed at child's rate; excess taxed at parent's marginal rate
Age limit (automatic application) Through age 18 Kiddie tax automatically applies to all children through age 18 with unearned income
Age limit (conditional application) Ages 19-23 (full-time students) Applies if child is a full-time student
Income types subject to kiddie tax Unearned income only Dividends, interest, capital gains, rent, royalties; NOT W-2 wages or self-employment income
Tax rate on excess Parent's marginal tax rate Can reach 37% for high-income parents, significantly higher than child's rate

Example Exam Questions

Test your understanding with these practice questions. Select an answer to see the explanation.

Question 1

David and Maria are opening a UGMA custodial account for their 10-year-old daughter with an initial $50,000 contribution invested in dividend-paying stocks. They expect the account to generate approximately $2,000 in annual dividend income initially, growing as they add more contributions. They are in the 32% tax bracket. Their investment adviser mentions the kiddie tax when discussing tax implications. What is the primary tax concern with this strategy?

Question 2

What is the 2026 threshold above which a child's unearned income is taxed at the parent's marginal tax rate under the kiddie tax rules?

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Question 3

A 15-year-old child has the following income for the tax year: $3,000 in W-2 wages from a summer job and $6,500 in dividend income from a UGMA custodial account. The parents are in the 32% federal tax bracket, and the child would be in the 10% bracket on their own income. Assuming the kiddie tax threshold is $2,700, what is the total federal income tax owed on the child's unearned income?

Question 4

All of the following statements about the kiddie tax are accurate EXCEPT

Question 5

A 17-year-old full-time high school student has $7,200 in dividend income from a UGMA account and $4,500 in W-2 wages from a part-time job. The parents are in the 32% tax bracket. Which of the following statements are accurate regarding the tax treatment of this income?

1. The $4,500 in wages will be taxed at the child's rate, not the parents' rate
2. The first $2,700 of dividend income will be taxed at the child's rate
3. The remaining $4,900 of dividend income will be taxed at the parents' 32% rate
4. All income must be reported on the parents' tax return because the child is a minor

💡 Memory Aid

Remember "Kids Can't Shift": The kiddie tax stops income shifting by taxing unearned income over $2,700 at the parent's rate, not the kid's rate. Think of it as the "$2,700 Allowance": the first $2,700 of unearned income is the kid's "tax allowance" at their low rate, but anything above that gets taxed like the parents earned it. Earned = Exempt: W-2 wages are always safe from kiddie tax.

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