REVENUE MEMORANDUM CIRCULAR NO. 11-2026 issued on February 9, 2026 notifies about the missing triplicate copy of unused/unissued BIR Form No. AF51 – Accountable Form No. 51 with Serial Number ACF201400141300.

Said form, which was reported as missing by Administrative Officer Lovely Bee Ann A. Cabasal and Revenue Collection Officer Fatima C. Benedito of Revenue District Office No. 7, has been cancelled and all official transactions involving the use thereof are considered as invalid.