National Internal Revenue Code (NIRC) – Title II – Income on Tax Codal & RulesEffectiveSovereignIncome TaxNIRC Title II of the National Internal Revenue Code of 1997, as amended by Republic Act Nos. 10963, 11256, 11346, 11467, and 11534.
National Internal Revenue Code (NIRC) – Title I – Organization and Function of the Bureau of Internal Revenue Codal & RulesEffectiveSovereignBIR FunctionsNIRC Title I of the National Internal Revenue Code of 1997, as amended by Republic Act Nos. 10963, 11256, 11346, 11467, and 11534.