(a) The person storing, using, or consuming a taxable item in this state is liable for the tax imposed by § 151.101 of this code, and except as provided by Subsection (b) of this section, the liability continues until the tax is paid to the state.
(b) A person storing, using, or consuming a taxable item in this state is not further liable for the tax imposed by § 151.101 of this code if the person pays the tax to a retailer engaged in business in this state or other person authorized by the comptroller to collect the tax and receives from the retailer or other person a purchaser’s receipt given as provided in § 151.103 of this code.