31.—(1) This regulation applies where—
(a)a notice has been issued by a billing authority under this Part requiring a payment or payments to be made by a person in respect of his liability to pay council tax for a financial year or part of a financial year,
(b)the payment or payments required to be made are found to be in excess of or less than his liability for the year or the part, and
(c)provision for adjusting the amounts required under the notice and (as appropriate) for the making of additional payments or the repaying or crediting of any amount overpaid is not made by any other provision of this Part, of the Act or of any agreement entered into under regulation 21(5).
(2) The billing authority shall as soon as practicable after the expiry of the year or the part of a year serve a further notice on the person stating the amount of his liability for the year or the part, and adjusting (by reference to that amount) the amounts required to be paid under the notice referred to in paragraph (1)(a).
(3) If the amount stated in the further notice is greater than the amount required to be paid under the notice referred to in paragraph (1)(a), the amount of the difference for which such other provision as is mentioned in paragraph (1)(c) is not made shall be due from the 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 as is specified in it.
(4) If there has been an overpayment, the amount overpaid for which such other provision as is mentioned in paragraph (1)(c) is not made—
(a)shall be repaid if the person so requires, or
(b)in any other case shall (as the billing authority determines) either be repaid or be credited against any subsequent liability of the person to make a payment in respect of any council tax of the authority.