Wisconsin Form BDW is the official Wisconsin Department of Revenue form used to report business taxes. It is used to report and pay all Wisconsin taxes for businesses, including corporate, partnership, and fiduciary income taxes, as well as sales and use taxes. There are two types of Wisconsin Form BDW: the Annual Return and the Extension Request. The Annual Return is used to report and pay taxes due for the current tax year, while the Extension Request is used to request an extension of time to file the Annual Return.