Ad Valorem filing deadlines approaching

April 28, 2021

To: Gross Revenue Taxpayers, Ad Valorem Taxpayers

The Wisconsin Department of Revenue (DOR) would like to remind you of the upcoming filing deadlines.

Reports due by May 3, 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: If you need to request an extension, see below.

To request an extension

Note: DOR will apply a non-appealable late filing penalty to all reports filed after the due date with no extension.


To avoid a delayed response, contact us at