Pursuant to the Legislature's authority under section 1 of article X of the Constitution of this state, whereby the Legislature is authorized to impose a tax upon incomes of persons and corporations and to classify and graduate the tax on all incomes according to the amount thereof and to exempt from taxation incomes below a minimum to be fixed by the Legislature, and whereby revenues so derived may be appropriated as the Legislature may provide, of the revenue collected under this article the State Treasurer shall retain in his hands such amount as the Tax Commissioner may determine to be necessary for refunds to which taxpayers shall be entitled under this article and on or before the tenth day of each month the State Treasurer shall, after reserving such refund amount, pay all interests, penalties and taxes collected under this article, and remaining to his credit in banks, banking houses or trust companies at the close of business on the last day of the preceding month, into the General Fund of the State Treasury.