In Notice 2016-66, the Treasury Department and the Internal Revenue Service (IRS) identified a particular § 831(b) “micro-captive” transaction as a “transaction of interest” for purposes of § 1.6011-4(b)(6) of the Regulations and §§ 6111 and 6112 of the Internal Revenue Code. The notice also alerts persons involved in such transactions to certain responsibilities and penalties that may arise from their involvement with these transactions.