Section 1. Subsection (b) of Section twenty-two of Commonwealth Act Numbered Four hundred sixty-six, as amended, is hereby further amended to read as follows:
"(b) Non-resident alien not engaged in trade or business within the Philippines. There shall be levied, collected and paid for each taxable year upon the entire income received from all sources within the Philippines by every non-resident alien individual not engaged in trade or business within the Philippines as interest, dividends, rents, salaries, wages, premiums, annuities, compensations, remunerations, emoluments, or other fixed or determinable annual or periodical or casual gains, profits and income, and capital gains a tax to twenty per centum of such income: Provided , That if the total income received by such non-resident alien individual from all sources within the Philippines exceeds twenty-three thousand eight hundred pesos, the rates established in Section twenty-one shall apply, but in no case shall the tax imposed under this subsection be less than twenty per centum of the total income."