(1) You have a decreasing luxury car tax adjustment if:
(a) you made a * taxable supply of a luxury car; and
(b) the whole or part of the * consideration for the supply has not been received; and
(c) you write off as bad the whole or a part of the debt, or the whole or a part of the debt has been * overdue for 12 months or more.
(2) The decreasing luxury car tax adjustment is equal to:
(a) the amount of luxury car tax that was payable by you on the supply taking into account any previous * luxury car tax adjustments for the supply; minus
(b) the amount of luxury car tax (if any) that would be payable if the * price of the supply of the car (disregarding any previous * luxury car tax adjustments for the supply) was reduced by an amount equal to the sum of:
(i) the amount or amounts of the debt written off as bad; and
(ii) the amount of the debt that has been * overdue for 12 months or more (other than amounts already written off).
(3) You cannot have a * luxury car tax adjustment under this section if you * account on a cash basis.