1. If judgment is rendered for the plaintiff, the amount of the judgment shall first be credited on any excise tax or other amount due from the plaintiff under this chapter, and the balance of the judgment shall be refunded to the plaintiff.
2. In any judgment, interest shall be allowed at the rate of 6 percent per annum upon the amount found to have been collected illegally from the date of payment of such amount to the date of allowance of credit on account of such judgment or to a date preceding the date of the refund warrant by not more than 30 days, such date to be determined by the Department.