(a) A seller who is a retail grocer and whose annual total receipts do not exceed $100,000 may pay the taxes imposed by this chapter by multiplying 15 percent times the total receipts of the seller to obtain the amount of taxable receipts.
(b) A state audit of a retailer electing to report his taxable receipts as provided by this section is limited to determining whether or not the grocer is eligible to use this method. No additional tax may be assessed or a refund or credit granted because of a showing that the tax liability of the retail grocer electing this method of reporting differs or would differ under any other method of reporting.

(c) A retail grocer who elects to report under this section shall continue to report as provided by this section for three years unless the grocer’s total receipts for a year exceed $100,000.
(d) If a retail grocer electing to report under this section has gross receipts in excess of $100,000 for a year, the grocer is ineligible to continue reporting under this section beginning on the first day of the calendar month after the month in which the limitation was exceeded, shall report the ineligibility to the comptroller, and shall immediately cease to use the method of reporting permitted by this section.
(e) Subsection (b) of this section does not apply to audits or the tax liability of a retail grocer who fails to report his ineligibility to the comptroller as required by Subsection (d) of this section.