Is child support taxable income?

The rule in one paragraph

Under the heading for child support, the publication says a payment specifically designated as child support, or treated as specifically designated, is not alimony. It adds that child support may vary over time and that such payments are not deductible by the payer and not taxable to the payee. That means a parent receiving support does not report it on Schedule 1 or anywhere else as income, and the parent paying it takes no deduction for it. The exact opposite is true for qualifying alimony under an old instrument, which is why the line between the two used to matter a great deal.

When a payment is treated as child support

A payment counts as specifically designated as child support to the extent it is reduced on the happening of a contingency relating to your child, or at a time clearly associated with such a contingency. The publication lists events that qualify as contingencies: the child becoming employed, dying, leaving the household, leaving school, marrying, or reaching a specified age or income level. It does not matter whether the event is certain or merely likely. So a single support figure that steps down when a child turns 18 can be partly child support even if the instrument never uses the words.

The 6-month and 1-year presumptions

The publication sets two situations where a reduction is presumed to be clearly associated with a child contingency. The first is a reduction not more than six months before or after the date the child will reach 18, 21 or the local age of majority. The second is reductions on two or more occasions, each not more than a year before or after a different child reaches an age from 18 to 24, where the age is the same for each child. Either you or the IRS can overcome the presumption by showing the timing was set independently of the children, for instance because the payment period is customary locally, such as one-half the length of the marriage. Reductions outside those windows are not treated as clearly associated.

What happens when you pay less than the total

If the instrument calls for both alimony and child support and the payer pays less than the total, payments apply first to child support and then to alimony. The publication gives a pre-2019-instrument example: $200 a month ($2,400 a year) of child support and $150 a month ($1,800 a year) of alimony. Paying the full $4,200 leaves $1,800 as alimony. Paying only $3,600 means $2,400 is child support and only $1,200 is alimony, not $1,800. Enter $2,400, $1,800 and $3,600 above to reproduce it. For an instrument executed after 2018 the alimony part is neither deductible nor taxable anyway, but the ordering still matters to what the payments are called.

Worked example with a drop

Suppose a payer owes $24,000 a year in total support and the instrument reduces that to $15,000 on the child’s 18th birthday in March. Because the reduction falls within six months of age 18 and the cause is the child’s age, the $9,000 reduction is treated as child support. In effect the publication treats that $9,000 as child support to the extent of the reduction. Under a post-2018 instrument the practical result is simpler: the payer deducts nothing and the recipient reports nothing.

What this page does not cover

Child support is separate from who may claim the child as a dependent. That question turns on nights spent with each parent and Form 8332 rather than on who pays support; see which divorced parent can claim the child. Support is also relevant to the dependency test, because a pre-1985 rule treats child support actually received as used for the child, and alimony received is not counted as support of a dependent.

Sources

• IRS Publication 504, Divorced or Separated Individuals (2025): the Child support and Specifically designated as child support discussions, the Underpayment example, and the Alimony introduction. Read November 2, 2026.

Edition read: Publication 504 (2025), for use in preparing 2025 returns. Dollar limits and dates in this publication are for 2025; check the current publication and form instructions for your tax year. This page summarizes the publication and does not replace it.