S.C. Code Ann. § 12-28-970 — Backup user fee equal to the user fee imposed

(A) A backup user fee equal to the user fee imposed by Section 12-28-310 is imposed and must be administered in accordance with procedures established by the department on the use on the highways of motor fuel subject to the user fee by an end user, including operators of state and local government vehicles, American Red Cross vehicles, and buses, and other persons exempted from the full federal highway tax, unless the person is exempted otherwise under Section 12-28-710(12), upon the delivery in this State into the fuel supply tank of a highway vehicle of:
(1) diesel fuel that contains a dye;
(2) motor fuel subject to the user fee on which a claim for refund has been made;
(3) alternative fuels; or
(4) substitute fuel on which a user fee previously has not been imposed by this chapter.
(B) The ultimate vendor of motor fuel subject to the user fee is jointly and severally liable for the user fee imposed by subsection (A) if the ultimate vendor knows or has reason to know that the motor fuel, as to which the user fee imposed by this chapter has not been paid, is or will be consumed in a nonexempt use.
(C)(1) A back-up user fee equal to the user fee imposed by Section 12-28-310 is imposed on a liquid or gas that is not otherwise taxed pursuant to this chapter and that is commonly or commercially known or sold as a fuel suitable for use in a highway vehicle. The user fee is due upon the first receipt of the product when received from a source outside of South Carolina by any wholesaler, retailer, or end-user and the user fee is imposed upon, and is the liability of, the wholesaler, retailer, or end-user who first received the product into the State.
(2) A back-up user fee equal to the user fee imposed by Section 12-28-310 is imposed on any liquid or gas that is not otherwise taxed pursuant to this chapter and that is commonly or commercially known or sold as a fuel suitable for use in a highway vehicle. The user fee is due upon the first sale or use of the product when produced in this State by a person and the user fee is imposed upon the first in-state sale or use by that person. The user fee is imposed upon, and is the liability of, the producer of the product.