REVENUE REGULATIONS NO. 1-98 issued April 14, 1998 redefines the term “Large Taxpayers”, modifies the criteria for determining large taxpayers and prescribes the time, place and manner of filing of tax returns and payment of taxes by large taxpayers, amending further RR No. 12-93, as amended by RR 3- 94. The coverage of the initial 1,500 large taxpayers to be identified is likewise specified in the Regulations.