Kiddie Tax Unearned Income Threshold and How It Works

The kiddie tax is a tax rule that applies when a dependent child’s unearned income (interest, dividends, capital gains, rental income) exceeds an annual floor. When triggered, that excess income is taxed at the parent’s marginal tax rate rather than the child’s own (typically lower) rate. The threshold is indexed annually for inflation and applies until the child reaches a certain age.

How the Threshold Works

A dependent child files their own tax return. The kiddie tax rule creates a two-tier system for unearned income:

Tier 1: Up to the threshold ($1,400 in 2024)

This income is taxed using the child’s own tax bracket. Since children often have low or zero earned income, they typically fall into the 10% bracket or lower. Any standard deduction they claim shields some or all of this.

Tier 2: Above the threshold

Once unearned income exceeds $1,400, the excess is taxed at the parent’s marginal rate—the highest bracket the parent is in. So if a parent is in the 24% bracket, each additional dollar of the child’s qualifying unearned income faces 24% tax, not the child’s 10%.

Worked Example

Child: age 16, dependent on parent’s return

• Receives $500 in dividend income
• Receives $1,200 in interest income
• Total unearned income: $1,700
• Earned income (part-time job): $0

Treatment:

• First $1,400: taxed at child’s bracket (assume 10%). Tax owed: $140.
• Remaining $300: taxed at parent’s bracket (assume 32%). Tax owed: $96.
• Total tax on unearned income: $236.

If the child had claimed the full standard deduction and had no earned income, the first $1,400 might have been entirely sheltered; only the $300 above the threshold would be taxed, at $96.

Annual Inflation Adjustment

The $1,400 threshold is indexed each year for inflation. The IRS publishes the new figure in late fall or early winter for the following tax year. Recent years show:

• 2023: $1,250
• 2024: $1,400
• 2025: (indexed figure to be announced)

The threshold grows modestly with inflation but can jump significantly in high-inflation years. Filers should check the current year’s threshold when preparing returns.

Age Limits and Phaseout

The kiddie tax rule applies through age 17 for most dependents. But it extends to:

• Age 18 if the child had no earned income (W-2 wages or self-employment) and lived with the parent for more than half the year.
• Ages 18–23 if the child is a full-time student, lived with the parent for more than half the year, and had earned income below $13,850. Once earned income tops $13,850, the rule stops applying even before age 24.

At age 24, the kiddie tax rule never applies, regardless of earned or unearned income.

What Counts as Unearned Income

Unearned income includes all investment returns and passive streams:

• Interest on savings accounts, CDs, bonds
• Dividends from stock holdings
• Capital gains from sales of securities or real estate
• Rental income and royalties
• Passive partnership or S-corporation distributions
• Annuity income and certain trust distributions

Notably, W-2 wages and net self-employment income from the child’s own work do not count as unearned income and are never subject to the kiddie tax.

Interaction with Standard Deduction

A child’s standard deduction is the greater of $1,350 (for 2024) or their earned income plus $450, up to the adult standard deduction ($14,600 single, for 2024).

If a child has $1,700 of unearned income and no earned income:

• Standard deduction: $1,350 (the floor)
• Taxable income before kiddie tax: $1,700 − $1,350 = $350
• All $350 falls below the kiddie tax threshold and is taxed at the child’s bracket

But if the child has $3,000 of unearned income and no earned income:

• Taxable income: $3,000 − $1,350 = $1,650
• First $1,400 of taxable income: child’s bracket
• Remaining $250: parent’s bracket (kiddie tax applies)

Gifts and Trusts

Unearned income from inherited assets, gifts, or trusts counts toward the threshold. A common planning scenario is a grandparent gifting appreciated securities to a grandchild in trust. If the trust distributes $2,000 of income annually:

• First $1,400: taxed at grandchild’s rate (or sheltered by child’s standard deduction)
• Remaining $600: taxed at parent’s rate (the child’s parent, not the grandparent)

Note: The kiddie tax rate is based on the child’s parent, not the gift-giver.

Parental Election to Include Child’s Income

Parents can elect to report the child’s unearned income on the parent’s own return, rather than filing a separate return for the child. This option applies when:

• The child’s gross income is from interest and dividends only (not capital gains or other unearned income)
• Gross income is under $12,200 (for 2024)
• No estimated tax payments were made and no estimated tax is required

The parental election simplifies filing if the child has only modest interest or dividend income. The IRS provides Form 8814 for this election.

Planning Implications

Families with children who hold significant investment portfolios face strategic choices:

• Timing distributions: Delaying distributions of unearned income until the child is older (outside the kiddie tax window) can reduce the parent’s tax impact. However, this must be weighed against the time-value of money.
• Asset location: Earning investment income in a retirement account or 529 plan (both of which defer or shield growth) avoids the kiddie tax entirely.
• Income-producing assets: Gifts of appreciating securities (where growth will be realized as a long-term capital gain in the future) are more tax-efficient than bonds or dividend payers that generate current unearned income.
• Qualified dividends: Long-term capital gains and qualified dividends can be taxed at 0%, 15%, or 20% rates. The parent’s bracket still applies, but these preferential rates may still favor the child’s own (lower) bracket for income below the threshold.

State and Local Tax Considerations

Some states conform to federal kiddie tax rules; others have their own thresholds or age limits. Families in high-tax states should verify state rules separately, as state tax on the child’s unearned income may apply at the child’s state bracket (not the parent’s) or may not apply the kiddie tax at all.

See also