9.—(1) This paragraph applies where the demand notice has been served on a liable person by a billing authority and after its issue the person ceases to be the liable person in respect of the chargeable dwelling and the period to which the notice relates.
(2) Subject to sub-paragraphs (5) and (6), no payments of instalments falling due after the relevant day are payable under the notice.
(3) The billing authority shall on the relevant day or as soon as practicable after that day serve a notice on the liable person stating the amount of his liability in respect of the council tax to which the demand notice relates as it has effect for the period in the relevant year up to the day on which he ceased to be so liable.
(4) If the amount stated under sub-paragraph (3) is less than the aggregate amount of any instalments which have fallen due on or before the relevant day, the difference shall go in the first instance to discharge any liability to pay the instalments (to the extent that they remain unpaid); and any residual overpayment—
(a)shall be repaid if the liable person so requires, or
(b)in any other case shall (as the billing authority determines) either be repaid or credited against any subsequent liability of the person to make a payment in respect of any council tax of the authority.
(5) If the amount stated under sub-paragraph (3) is greater than the aggregate amount of any instalments which have fallen due on or before the relevant day, the difference between the two shall be due from the liable person to the billing authority on the expiry of such period (being not less than 14 days) after the day of issue of the notice served under that sub-paragraph as is specified in it.
(6) If this paragraph applies in relation to a demand notice, and after the person ceases to be liable to pay an amount in respect of council tax for the relevant year he again becomes liable to make such a payment, a further notice shall be served on the liable person requiring payments in respect of the council tax as it has effect for the period in the year after he becomes so liable; and regulations 19 to 23 (and, so far as applicable, this Schedule) shall apply to the further notice with respect to that period and the sums payable by the liable person with respect to that period, as if it were a different demand notice.
(7) In this paragraph “the relevant day” means the day on which the person ceases to be liable to make payments in respect of council tax.