The CIR of the Bureau has recently issued Revenue Memorandum Circular (RMC) No. 61-2015 to extend the deadline, initially set on or before September 30, 2015 per Revenue Memorandum Circular (RMC) No. 57-2015 to on or before October 31, 2015, for the submission of the Inventory Lists and other supporting requirements covering ending inventory as of December 31, 2014, and thereafter every 30th day following the close of the taxable year, depending on the accounting period being adopted by the taxpayer.
Please refer http://www.bir.gov.ph/images/bir_files/internal_communications_2/RMCs/RMC_61-2015_Extension_InventoryList.pdf of the full text of RMC No. 61-2015.