• “discount” means a discount under section 11 or section 12 of the Act, or a reduction in the amount of council tax payable for a dwelling under section 13A of the Act where the dwelling falls into a class for which the billing authority has determined under section 13A(3) that liability shall be reduced otherwise than to nil;

• “exempt dwelling” means a dwelling which is exempt from council tax under the Exempt Dwellings Order or a dwelling which falls into a class for which the billing authority has determined under section 13A(3) of the Act that the amount of council tax payable shall be reduced to nil.