All returns of intangible personal property shall be made by the taxpayer on or before May 1 in each year, and the full amount of the tax payable as shown on the face of the return shall be so paid.
Code 1950, §§ 58-424, 58-428, 58-441; 1960, c. 508; 1977, c. 396; 1984, c. 675.