You have an increasing adjustment if:
(a) you made a * taxable supply in relation to which you had a * decreasing adjustment under section 21 - 5 for a debt; and
(b) you recover the whole or a part of the amount written off, or the whole or a part of the amount that has been * overdue for 12 months or more, as the case requires.
The amount of the increasing adjustment is 1 / 11 of the amount recovered.