(2) The total amount payable in respect of any 638 one person to the Province or to any one municipality, district board, local board, or other local authority in the Province by way of taxes on professions, trades, callings, and employments shall not, after the thirty first day of March nineteen hundred and thirty nine, exceed fifty rupees per annum: Provided that if in the financial year ending with that date there was in force in the case of any Province or any such municipality, board or authority a tax on professions, trades, callings, or employments the rate, or the maximum rate, of which exceeded fifty rupees per annum, the preceding provisions of this sub section shall, unless for the time being provision to the contrary is made by a law of the Federal Legislature, have effect in relation to that Province, municipality, board or authority as if for the reference to fifty rupees per annum there were substituted a reference to the rate or maximum rate, or such lower rate, if any, (being a rate greater than fifty rupees per annum) as may for the time being be fixed by a law of the Federal Legislature; and any law of the Federal Legislature made for any of the purposes of this proviso may be made either generally or in relation to any specified Provinces, municipalities, boards or authorities.