(a) Every person subject to the payment of the tax hereby imposed who has commenced his business at least one (1) full year prior to the beginning of any tax year shall compute his annual receipts upon the actual receipts received by him during the preceding calendar year.

(b) Every person subject to the payment of the tax hereby imposed who has commenced his business less than one (1) full year prior to the tax year one thousand nine hundred fifty for the tax year one thousand nine hundred fifty, or who has commenced his business subsequent to the beginning of any tax year for such tax year, shall compute his annual receipts upon the actual receipts received by him during the part of such tax year remaining, and on his actual receipts of his first full year for the first full tax year he engages in business, as the case may be.

(c) Every person subject to the payment of the tax hereby imposed who engages in a business, temporary, seasonal or itinerant by its nature, shall compute his annual receipts upon the actual receipts received by him during such license year.

(d) Any person who pays his tax based only on his gross receipts shall not be required to show on his return his net income.