May 25, 2021
To: Ad Valorem Taxpayers
The Wisconsin Department of Revenue (DOR) would like to remind you of the upcoming June 1, 2021 filing deadline.
Forms due June 1, 2021
- AC-001 Airline
- RA-001 Railroad
- PI-001 Oil Pipeline
- PF-001 Gas Pipeline
- CR-800 Conservation/Regulation
- MP-800 Association of Municipal Electrics
Note: DOR will apply a non-appealable late filing penalty to all reports filed after the June 1, 2021 extended due date.
If you have any questions, contact us at