# Calculation of increase

> reg-4.31BB — as in force on 2026-06-01 — F2026C00497 · Compilation No. 287 — https://www.legislation.gov.au/F2026C00497/latest/text

4.31BB Calculation of increase
          (1) If, in a relevant period, the latest CPI number is greater than the earlier CPI
              number, a fee is taken to increase, on 1 July immediately following the end of the
              period, in accordance with the formula:
                Fee Latest CPI number
                   Earlier CPI number

               where:
               earlier CPI number is the CPI number for the last March quarter before the
               beginning of the relevant period; and
               latest CPI number is the CPI number for the last March quarter before the end of
               the relevant period.
          (2) If, apart from this subregulation, the amount of a fee increased under
              subregulation (1) would be an amount of dollars and cents, the amount is to be
              rounded to the nearest whole dollar and, if the amount to be rounded is 50 cents,
              rounded down.







          (3) Subject to subregulation (4), if at any time, whether before or after the
              commencement of this regulation, the Australian Statistician publishes for a
              particular March quarter a CPI number in substitution for an index number
              previously published by the Australian Statistician for that quarter, the
              publication of the later index number is to be disregarded for the purposes of this
              regulation.
          (4) If, at any time, whether before or after the commencement of this regulation, the
              Australian Statistician changes the reference base for the Consumer Price Index,
              then, for the purposes of the application of this regulation after the change is
              made, regard must be had only to numbers published in terms of the new
              reference base.
          (5) In this regulation:
               CPI number means the All Groups Consumer Price Index number (being the
               weighted average of the 8 Australian capital cities) published by the Australian
               Statistician.
               fee means:
                 (a) a fee prescribed by subregulation 4.31B(1); or
                 (b) the fee in force at the end of the relevant period if regulation 4.31BA
                     applies.
               relevant period means a financial year starting on or after 1 July 2024.