Every individual who is self-employed, or whose tax for any other reason is not deducted by an employer under §
308-10, shall file a tax return and pay the tax directly to the Collector. Except as otherwise stated in the regulations, every such individual engaged in an occupation within the taxing authority at any time after the effective date and on or before March 31, shall file a tax return and pay the full amount of the tax to the Collector on or before April 30. Except as otherwise stated in the regulations, every such individual who has not previously paid the full amount of the tax, who engages in an occupation within the taxing authority at any time in any of the three-month periods ending June 30, September 30, and December 31, shall file a tax return and pay the full amount of the tax to the Collector on of before the following July 30, October 30, and January 30, respectively. Every individual who is self-employed, or whose tax for any other reason is not deducted by an employer under §
308-10, shall follow this same procedure in every tax year.