(a) The annual tax levied by this article is due and payable in monthly installments, on or before the fifteenth day of the month succeeding the month in which the taxable gross receipts were received, except that the tax levied for the last month of the taxable year is due and payable on or before the last day of the first month of the next succeeding taxable year.
(b) The taxpayer shall, on or before the fifteenth day of each month, except for the last month of the taxable year, complete and mail to the Tax Commissioner a return for the preceding month, in the form prescribed by the Tax Commissioner, showing:
(1) The total gross receipts or gross proceeds received for services delivered pursuant to Title XIX of the Social Security Act, as amended, for that particular month;
(2) The gross proceeds upon which the tax is based;
(3) The amount of the tax for which the taxpayer is liable; and
(4) Any other information necessary in the computation and collection of the tax which the Tax Commissioner may require. The taxpayer shall include with the return a remittance for the amount of the tax for the period covered by the return.
(c) On or before the last day of the first month after the end of the taxable year, every taxpayer subject to the tax imposed by this article shall make and file an annual return for the entire taxable year showing such information as the Tax Commissioner may require and computing the amount of taxes due under this article for the entire taxable year. The Tax Commissioner shall allow a credit against this annual tax liability for the amount of tax imposed by this article (exclusive of any addition to tax, penalties or interest paid with respect thereto) previously paid by the taxpayer on gross receipts included in the annual return. The taxpayer shall submit with the annual return a remittance for the net amount of tax shown to be due.