REVENUE MEMORANDUM CIRCULAR NO. 50-2007 issued on July 30, 2007 provides basic questions and answers to clarify the tax treatment of the sale, barter or exchange of goods or properties or sale or exchange of services made by suppliers from the customs territory to the registered Freeport Zone enterprises in the Subic Freeport Zone, the Clark Freeport Zone, as well as the Poro Point Freeport Zone and vice versa under Sections 12 and 15 of Republic Act (RA) No. 7227, as amended by RA No. 9400.