1. Reorganization under Executive Order No. 94 (October 1, 1947)
2. Major reorganization through Revenue Memorandum Order (RMO) No. 41 (March 1, 1954)
3. First 2 Regional Offices created in Cebu and Davao (July 20, 1955)
4. Position title changed from Collector to Commissioner (January 1957)
5. Tax Census Division and Tax Census Unit established (1958)
6. RA No. 233 (Rewards Law) passed (June 19, 1959)
7. Philippines re-divided into 15 regions and 72 inspection districts (1964)