REVENUE MEMORANDUM ORDER NO. 6-2005 issued on March 15, 2005 creates the Alphanumeric Tax Codes WC050 (if the current year’s gross income is P 720,000 and below) and WC051 (if the current year’s gross income exceeds P 720,000) for income payment subject to creditable withholding taxes to facilitate the proper identification and monitoring of withholding taxes and for Integrated Tax System purposes.