Wis. Admin. Code Ethics Commission ETH 1.385
A candidate shall be subject to the contribution limits that apply to the candidate at the time of the primary election at which the candidate's name appears on the ballot. If a candidate for any office has unspent contributions in his or her campaign depository at the time of filing nomination papers that were lawful at the time of receipt but exceeded the contribution limit that applies to the office for which the candidate is seeking nomination, the candidate shall dispose of the unspent contributions. The candidate shall either return the excess contribution to the contributor on a reasonable basis that the candidate determines or donate the excess contribution to either the common school fund or a charitable organization.
Wis. Admin. Code Ethics Commission ETH 1.385