Delaware Code
Subchapter I. Gasoline
§ 5120. Refunds of motor fuel taxes.

(a) The Secretary of Transportation shall refund out of the General Fund of this State the tax paid on gasoline upon receipt of written authorization from the Department of Transportation so to do, which written authorization shall be given under the following conditions:

(1) Gasoline used by any person for the purpose of operating stationary gas engines, tractors, motorboats, airplanes or aircrafts, or any other purpose except in motor vehicles licensed, or subject to being licensed, for operation upon any of the public highways of the State.
(2) [Repealed.]
(3) Gasoline sold and delivered to, and used and consumed by, the operators of taxicab businesses in the operation of a taxicab or taxicabs in the normal course of such businesses; provided, however, that the main base of operations of the taxicab business in each case must be in the State, and the application provided for in subsection (b) of this section must certify that all fees and taxes then due from such business to the State or to any local government of the State by the operator and/or owner of such taxicab business shall have been paid in full. For purposes of this paragraph, the definition of “taxicab” shall be as set forth in § 101 of Title 21.
(b) Such application shall be in such form as shall be prescribed by the Department, shall be under the penalties of perjury, and shall state the quantity of gasoline with respect to which refund is claimed, the purpose for which said gasoline was used, date of purchase, from whom purchased, and such other information as the Department shall require.
(c) Such application shall be accompanied by the original invoice showing such purchase, together with evidence of the payment thereof.
(d) All applications for refunds must be filed with the Department of Transportation within 12 calendar months from the date of the purchase or invoice of the gasoline with respect to which a tax refund is claimed.
(e) The conditions of this section having been fully complied with, the Department of Transportation shall determine the amount of the refund due on such application and authorize the Secretary of Transportation in writing to pay such amount within 30 days from the time of filing of the application for refund.
(f) There shall be refunded out of the General Fund of this State any tax, penalty or interest erroneously or illegally collected under this chapter. A refund claim prepared in such manner as the Department may prescribe shall be filed with the Department within 1 year from the earlier of:

(1) The date of the payment; or
(2) The date the payment was required to be made.
The Department shall certify the amount thereof to the State Treasurer who shall thereupon draw a warrant to the claimant forthwith.
(g) If a refund granted under this section shall later be determined to have been erroneously or illegally paid in whole or in part, the Department of Transportation may demand, within 3 years from the date of such payment, that restitution be made to the General Fund of this State. Interest on said moneys assessed shall accrue at the rate of 1% per month, or fraction thereof, from the date of notification by the Department of Transportation until receipt of payment.