³ Updates in Taxation´ Atty. Rizalina V. Lumbera Updates in Taxation Period Covered: 2007 to 2009(a). Jurisprudence(b). Tax LawsRevenue RegulationsRepublic Act 9504 2007 CASES 2007 Cases: COMMISSIONER OF INTERNAL REVENUE versus ISABELA CULTURALCORPORATION (ICC) (G.R. 172231 12 February 2007) B usiness Expenses: (a) Expenses for the auditing services;(b) Expenses for the legal services;(c) Expense for security services;Rules:(a) the expense must be ordinary and necessary;(b) it must have been paid or incurred during thetaxable year;(c) it must have been paid or incurred in carrying onthe trade or business of the taxpayer; and(d) it must be supported by receipts, records or other pertinent papers.