Wis. Stat. § 177.0403: When report to be filed.

(1) Subject to sub. (2), the report under s. 177.0401 shall be filed on or before November 1 of each year and cover the 12 months preceding July 1 of that year.

(2) Before the due date for filing the report under s. 177.0401, the holder of property presumed abandoned may request the administrator to extend the time for filing. The administrator may grant an extension of 60 days or other period agreed to by the administrator.