(l) Where a declared provision comes into operation as an enactment in an amended form before the expiry of the sixtieth day after the date on which such provision had the force of law under sub-section (1) of Section 4, refunds shall be made of all taxes collected which would not have been collected if the provision adopted in the enactment had been the declared provision:
Provided that the rate at which refunds of any tax may be made under this sub-section shall not exceed the difference between the rate of such tax proposed in the declared provision and the rate in force immediately prior to the date on which the declared provision had the force of law under sub-section (1) of Section 4.
(2) Where a declared provision ceases to have the force of law under clause (b) or clause (c) of sub-section (2) of Section 4, refunds shall be made of all taxes collected which would not have been collected, if the declaration in respect of it had not been made.