An Act Establishing The Gross Income System Of Taxation For Income Derived From Trade Or Business Or From The Exercise Of A Profession Or Vocation, Amending For The Purpose Sections 21(A); 22(A)(1); 2

An Act Establishing The Gross Income System Of Taxation For Income Derived From Trade Or Business Or From The Exercise Of A Profession Or Vocation, Amending For The Purpose Sections 21(A); 22(A)(1); 23; 24(A), (B) And (C); 25(A) (1); 27; 28; 29 And30 Of The National Internal Revenue Code Of The Phil