Each self-employed individual who performs services of any type or kind or engages in any occupation or profession within a primary place of employment within the Township shall be required to comply with this article and pay the pro rata portion of the tax due to the Collector on or before the thirtieth day following the end of the first quarter or any subsequent quarter in which they become self-employed within the Township. For purposes of determining the pro-rata share, self-employed individuals shall be deemed to have one pay period per year and the pro- rata share shall be deemed to be $52.