(1) A council's budget for a financial year must be reviewed by the council as follows:
(a) on at least one occasion between 1 July and 31 December in the financial year;
(b) on at least one occasion between 1 January and 30 April in the financial year.
(2) If the council adopts an amended budget as a result of the review, and the amended budget has a material impact on the council's long-term financial plan, the council must, by resolution, amend the council's long-term financial plan at the same time as adopting the amended budget.