rdo code list|BIR RDO Codes – Updated List of Revenue District : Bacolod An RDO code is a three-digit numeric or alphanumeric code assigned to each RDO in the country. The BIR uses these codes to track the amount of tax collection within a particular region and record and process tax returns, payments, and withholding taxes. The . Tingnan ang higit pa Google Tag Manager (noscript) -->