The Kiddie Tax: Limits on Shifting Unearned Income to Children

For a long time, a popular tax-saving strategy for high-income families was to funnel unearned income through their children to reduce their overall taxes. The IRS has never been thrilled with this practice, and adopted the "kiddie" tax in the 1980s to limit its effectiveness by taxing certain amounts of children's unearned income at a very high rate. The Tax Cuts and Jobs Act (TCJA), the massive tax reform law that took effect in 2018, made major changes in the kiddie tax that are in effect for 2018 and 2019. These proved so unpopular they were repealed in 2019.

Who Does the Kiddie Tax Apply To?

The kiddie tax only applies to:

• children under 19 years of age, and
• children aged 19 through 23 who are full-time students and whose earned income does not exceed half of the annual expenses for their support.

A child who turns 20 (or 24) by the end of the tax year is not subject to the kiddie tax. To be considered a student, a child must attend school full time during at least five months of the year. It doesn't matter whether the child is claimed as a dependent on the parent's return. However, the tax does not apply to a child under 24 who is married and files a joint tax return.

Moreover, the kiddie tax applies only to unearned income a child receives from income-producing property (or investment property), such as cash, stocks, bonds, mutual funds, and real estate. Any salary or wages that a child earns through full or part-time employment (or self-employment) are not subject to the kiddie tax rules -- that income is taxed at the child's regular income tax rate.

If your child has unearned income subject to the kiddie tax, he or she should file his or her own tax return with IRS Form 8615, Tax for Certain Children Who Have Unearned Income.

The Kiddie Tax for 2020 and Later

The Setting Every Community Up for Retirement Enhancement Act of 2019 (SECURE Act) repealed the changes made by the TCJA in the kiddie tax. The SECURE Act reinstated the kiddie tax as it was before 2018. This change is mandatory for 2020 and later.

Under these rules, children pay tax at their own income tax rate on unearned income they receive up to a threshold amount--for 2020, the threshold is $2,200. All unearned income that kids receive above the threshold amount is taxed at their parent's highest income tax rate, if higher than the child's rate. That rate can be as high as 37%, compared to the 10% rate that most children would be paying.

In some cases, figuring the kiddie tax can be complex. For example, if a parent has more than one child subject to the kiddie tax, the net unearned income of all the children has to be combined, and a single kiddie tax calculated.

The Kiddie Tax for 2018 and 2019

For 2018 and 2019, parents have the choice of calculating their kiddie tax using their personal income tax rates or using the method proscribed by the TCJA. This method uses the tax rates for trusts and estates instead of parent’s personal rates. The 2019 rates are shown in the following chart:

With this method a child's tax rate is not affected by his or her parents’ tax situation or the unearned income of any siblings.

However, these rates can be higher than the parents’ rates. For example, the kiddie tax rate is 37% on income over $12,750. A married couple would have to have over $612,350 in income in 2019 to pay tax at this rate. On the other hand, children with smaller unearned incomes can pay less under these tax rates.

If you already filed your taxes for 2018 or 2019 and used the estates and trusts tax rates to calculate your kiddie taxes, you can recalculate them using your personal rates under the rules for 2020. If this results in lower taxes you are owed a refund. You can file an amended return to claim it.