Me. Rev. Stat. tit. 36, § 2520

Every attorney-in-fact of a reciprocal insurer by or through whom are issued policies or contracts of indemnity by a reciprocal insurer as defined in Title 24‑A, section 402, subsection 1, in lieu of all other taxation, state, county or municipal, in this State, shall pay a tax at the rate of 2% on gross premiums or deposits actually received during the year after deducting amounts that are actually returned to policyholders as the unused part of a premium or deposit or credited on the renewal or extension of the indemnity.