Child Support in Montana
State-specific overview · Family Law
Montana uses income shares model; support ends at age 19 unless child remains in high school.
How Montana treats Child Support
Montana calculates child support by combining both parents' incomes and applying a percentage-based formula under the income shares model. Support obligations typically terminate when a child turns 19, but continue through high school graduation if the child is still enrolled. The state allows modification of support orders if circumstances change materially, and both parents' incomes—including self-employment income—factor into calculations.
The general definition of Child Support
Court-ordered payments from one parent to the other for a child's living expenses.
Child support is money that a court requires one parent to pay to the other parent (or guardian) to help cover the child's expenses like food, housing, education, and healthcare. The amount is usually calculated using state guidelines that consider both parents' incomes, the number of children, and custody arrangements. Child support continues until the child reaches the age of majority, typically 18 or 21 depending on the state. It's a legal obligation separate from custody decisions.
Read the full Child Support entry →This page is a plain-English reference and is not legal advice. State laws change frequently. For specific situations consult a licensed attorney in Montana.