In the calculation of the tax due in accordance with section 6 of P.L. 1940, c. 5 (C. 54:30A-54), in the year 1980 and in each year thereafter, every person, copartnership, association or corporation subject to tax hereunder shall be entitled to a credit in the amount of the tax hereunder as a partial payment in the preceding year and shall be entitled to the return of any amount so paid which shall be found to be in excess of the total amount payable in accordance with P.L. 1940, c. 5 and this act.
N.J.S. § 54:30A-54.5