Wis. Admin. Code § Tax 2.986
(4) Registration deadline.
(b) A business that desires registration for the calendar year in which it begins doing business in this state shall register with the department during the following calendar year.
Example: Business A begins doing business in Wisconsin on March 8, 2014. Business A must register with the department for calendar year 2014 between January 1, 2015, and December 31, 2015.
History: CR 14-005: cr. Register August 2014 No. 704, eff. 9-1-14.