Can child support be retroactive in Wisconsin?

Wisconsin places significant limits on retroactive modification of an existing child-support order. As a general rule, a court cannot retroactively revise the amount of support that accrued before the date on which the motion, petition, or order to show cause seeking modification was served, subject to specific statutory exceptions.

That rule is different from establishing an initial support obligation in a case where no current support order existed. Depending on the type of proceeding and the governing statutes, a court may have authority to order support for an earlier period. The available look-back period and required findings depend on the procedural posture of the case.

Because “retroactive support” can mean either revising an existing order backward or establishing support for a prior period when no order was in effect, the distinction is important. The two situations are governed by different rules.

A parent seeking a change in an existing support order should generally act promptly rather than assuming the court can later correct the amount for all prior months.

Primary Wisconsin authorities: Wis. Stat. §§ 767.59 and applicable initial-support provisions of ch. 767.