SECTION 1. The first paragraph of item (1), paragraph (l) of Section 29 of the National Internal Revenue Code, as amended, is hereby further amended to read as follows:
"(l) Personal exemptions allowable to individuals. - (1) Basic personal exemption. - For the purpose of determining the tax provided in Section 21(a) of this Title, there shall be allowed a basic personal exemption as follows:
"For single individual or married individual judicially decreed as
legally separated with no qualified dependents------------------ P 9,000
"For head of a family ---------------------------------------------- P12,000
"For married individual --------------------------------------------- P18,000
Provided, That husband and wife electing to compute their income tax separately shall be entitled to a personal exemption of P9,000 each."