Whether child support extends to college costs after a child turns 18 depends heavily on the state and on what a specific order or settlement agreement says. In some states, a court can order a parent to contribute to college expenses as part of a support obligation. In others, standard child support is treated as ending once a child reaches the age of majority or finishes high school, and any college contribution becomes a matter the parents can agree to voluntarily, but that a court generally cannot impose.
Why this varies so much
Child support law is set at the state level, and states differ sharply on whether continued education past high school falls within a parent's support duty at all. Some approach it as an extension of the reasoning behind child support generally, that a child's access to education should not be limited by the parents' divorce. Others treat the traditional support obligation as ending at majority and see college costs as outside a court's authority to order absent an agreement between the parents.
Where agreements come in
Even in states where a court cannot order college support, parents are generally free to agree to it themselves, and many settlement agreements include specific language addressing tuition, room and board, or a cap tied to a public university's cost. Once incorporated into a court order, that kind of agreement is typically enforceable even if the underlying state law would not have required it.
What courts commonly consider when they can order it
In states where courts have authority to address college costs, they often weigh both parents' financial ability, what the family's standard of living would have supported had the marriage continued, available financial aid and scholarships, and the child's own academic circumstances.
Why this matters for a case
Because this issue is so state-dependent, and because existing settlement language can control the outcome regardless of what state law otherwise provides, a licensed family law attorney in the relevant state is the right resource to determine whether, and how, college expenses factor into a specific support obligation.