Paragraph 4 Calculating the remaining amountF1

The billing authority shall on or as soon as practicable after the day on which the application was served calculate the amount remaining to be paid under the current demand or under the agreement referred to in paragraph 1(1)(a)(ii) in accordance with the formula—

where—

1. (a)

   A equals the amount last estimated under regulation 6(1) for the purposes of the current demand or pursuant to provision made in the agreement mentioned in paragraph 1(1)(a)(ii); or if pursuant to regulation 4(3) (without modification) the notice or the agreement relates to more than one hereditament the aggregate of the amount of those estimates; and

2. (b)

   B equals the aggregate of any instalments payable under the notice or agreement (whether paid or not) before the deferral day.