Family
How child support orders are set and changed
Calculated by state formula, enforced by a state agency, and changed only by going back — not by agreement between the parents.
Every state uses a published formula based mainly on the parents' incomes and the parenting time arrangement. Because the formula is published, the result is largely predictable before anything is filed, and most states put a calculator online.
Every state also runs a child support agency that can establish, modify and enforce orders. Its services are available to either parent, and in most cases for a very small fee or none. It is not a substitute for a lawyer in a contested matter, but for establishing or enforcing a straightforward order it is the standard route.
The most consequential thing to know: a change in circumstances does not change an order by itself. Support continues to accrue at the ordered rate until a court modifies it, and arrears generally cannot be cancelled retroactively. A private agreement between parents does not alter the order either.
So the response to a lost job or a changed schedule is to file for modification promptly, because in most states the change can only take effect from the filing date and not from when the circumstances changed.
What to do next. If circumstances change, file for modification immediately rather than relying on an agreement with the other parent.
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