1. Assessment and collection of all national revenue taxes, fese and charges;
2. Enforcement of all forfeitures, penalties, and fines on internal revenue taxes, fees and charges;
3. Execution of judgments in all cases decided in its favor by the Court of Tax Appeals and the ordinary courts; and
4. Give effect and administer the supervisory and police powers conferred to it by the Tax Code and other laws. (Sec. 2, NIRC)
