Subd. 3.
Transitional period for services.
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:
(1) for a rate increase, the new rate shall apply to the first billing period starting on or after the effective date; and
(2) for a rate decrease, the new rate shall apply to bills rendered on or after the effective date.