BIR National Office, Diliman, Quezon City August 2, 2017 President Rodrigo Roa Duterte joined the officials and employees of the Bureau of Internal Revenue (BIR) as the agency celebrated its 113th founding anniversary at the BIR National Office in Diliman, Quezon City. The BIR adopted its tax campaign theme for this year, ‘Tunay na Pagbabago, continue reading : 113th Bureau of Internal Revenue (BIR) Anniversary