1. To claim a refund in accordance with section 142.815, a person shall present to the director a statement containing a written verification that the claim is made under penalties of perjury and lists the total amount of motor fuel purchased and used for exempt purposes. The claim shall not be transferred or assigned and shall be filed not more than three years after the date the motor fuel was imported, removed or sold if the claimant is a supplier, importer, exporter or distributor. If the claim is filed by the ultimate consumer, a consumer must file the claim within one year of the date of purchase or April fifteenth following the year of purchase, whichever is later. The claim statement may be submitted electronically, and shall be supported by documentation as approved by the director and shall include the following information:

(1) Date of sale;

(2) Name and address of purchaser;

(3) Name and address of seller;

(4) Number of gallons purchased and base price per gallon;

(5) Number of gallons purchased and charged Missouri fuel tax, as a separate item; and

(6) Number of gallons purchased and charged sales tax, if applicable, as a separate item.

2. If the original sales slip or invoice is lost or destroyed, a statement to that effect shall accompany the claim for refund, and the claim statement shall also set forth the serial number of the invoice. If the director finds the claim is otherwise regular, the director may allow such claim for refund.

3. The director may make any investigation necessary before refunding the motor fuel tax to a person and may investigate a refund after the refund has been issued and within the time frame for making adjustments to the tax pursuant to this chapter.

4. In any case where a refund would be payable to a supplier pursuant to this chapter, the supplier may claim a credit in lieu of such refund for a period not to exceed three years.

5. Every person shall maintain and keep for a period of three years records to substantiate all claims for refund of the motor fuel tax, together with invoices, original sales slips marked paid by the seller, bills of lading, and other pertinent records and paper as may be required by the director for reasonable administration of this chapter.

6. Motor fuel tax that has been paid more than once with respect to the same gallon of motor fuel shall be refunded by the director to the person who last paid the tax after the subsequent taxable event upon submitting proof satisfactory to the director.

7. Motor fuel tax that has otherwise been erroneously paid by a person shall be refunded by the director upon proof shown satisfactory to the director.

8. If a refund is not issued within forty-five days of an accurate and complete filing, as required by this chapter, the director shall pay interest at the rate provided in section 32.065 accruing after the expiration of the forty-five-day period until the date the refund is issued.

9. The director shall promulgate rules as necessary to implement the provisions of this section. Any rule or portion of a rule, as that term is defined in section 536.010, that is created under the authority delegated in this section shall become effective only if it complies with and is subject to all of the provisions of chapter 536 and, if applicable, section 536.028. This section and chapter 536 are nonseverable and if any of the powers vested with the general assembly pursuant to chapter 536 to review, to delay the effective date, or to disapprove and annul a rule are subsequently held unconstitutional, then the grant of rulemaking authority and any rule proposed or adopted after August 28, 2021, shall be invalid and void.