Me. Rev. Stat. tit. 28-A, § 1365

In addition to any tax paid under section 1652, each certificate of approval holder that manufactures low-alcohol spirits products shall pay a tax of 30¢ on each gallon of low-alcohol spirits product sold to a wholesale licensee. In addition to the forms filed pursuant to section 1364, on or before the 15th day of each calendar month, a certificate of approval holder that manufactures low-alcohol spirits products shall file with the bureau a monthly report on the number of gallons of low-alcohol spirits product sold to wholesale licensees with a copy of each invoice relating to each such sale. The certificate of approval holder must enclose payment for the tax due under this section on the reported sales.