On or before March 1, every telephone company shall send to the department a completed form that the department prescribes. Upon written request, the department may extend the time for filing the report by no more than 30 days. The requirements for payment of taxes under s. 76.13(2a), as they apply to the tax under subch. I, apply to the tax under this subchapter.
Wis. Stat. § 76.83