When there is a change in the rate of tax imposed by this section, the following transitional period shall apply to the taxable services purchased for use, storage, distribution, or consumption in this state when the service purchased covers a billing period starting before and ending after the statutory effective date of the rate change:
Minn. Stat. § 297A.63
2000 c 418 art 1 s 6; 2006 c 259 art 6 s 8; 2008 c 154 art 12 s 19; 2011 c 112 art 4 s 3