All returns shall be filed according to the following schedule:

   (1) Tangible personal property—April 1.

   (2) Real property—when required by specific provision of general law.

   (3) Railroad, railroad terminal, private car and freight line and equipment company property—April 1.

   (4) All other returns and applications not otherwise specified by specific provision of general law—April 1.

s. 12, ch. 70-243; s. 45, ch. 77-104; s. 8, ch. 79-334;