The legislative scheme
11 Section 19 of the SRC Act requires compensation to be paid to an injured employee if the injury results in incapacity for work. The calculation begins with "NWE" which is stated to be "the amount of the employee's normal weekly earnings".
12 Section 4 defines "normal weekly earnings" as follows:
4 Interpretation
(1) In this Act, unless the contrary intention appears:
…
normal weekly earnings means the normal weekly earnings of an
employee calculated under section 8.
13 Section 8 provides a formula for calculating normal weekly earnings. It is critical to the present case. Section 8(1) provides:
8 Normal weekly earnings
(1) For the purposes of this Act, the normal weekly earnings of an employee (other than an employee referred to in subsection (2)) before an injury shall be calculated in relation to the relevant period under the formula:
(NH x RP) + A
where:
NH is the average number of hours worked in each week by the employee in his or her employment during the relevant period;
RP is the employee's average hourly ordinary time rate of pay during that period; and
A is the average amount of any allowance payable to the employee in each week in respect of his or her employment during the relevant period, other than an allowance payable in respect of special expenses incurred, or likely to be incurred, by the employee in respect of that employment.
14 Before dealing with other aspects of s 8 it is desirable to refer to other provisions which inform its use. Section 4 provides a definition of "normal weekly hours" for use in the calculation stipulated in s 8(1) as follows:
4 Interpretation
(1) In this Act, unless the contrary intention appears:
…
normal weekly hours, in relation to an employee, means the average number of hours (including hours of overtime) worked in each week by the employee in his or her employment during the relevant period as calculated for the purpose of applying the formula in subsection 8(1) or (2).
15 Section 9(1) stipulates the "relevant period" for the purposes of s 8 as follows:
9 Relevant period
(1) For the purposes of calculating the normal weekly earnings of an employee before an injury, a reference in section 8 to the relevant period is, subject to this section, a reference to the latest period of 2 weeks before the date of the injury during which the employee was continuously employed by the Commonwealth or a licensed corporation.
…
16 It will be necessary to return, in due course, to the balance of s 9 in another connection.
17 Section 8(4) and (5) guards against any arbitrary or plainly unfair outcome arising from the operation of s 9(1). It provides:
8 Normal weekly earnings
…
(4) Where, because of the shortness of the relevant period, it is impracticable to calculate the normal weekly earnings of an employee before an injury under subsection (1) or (2), the normal weekly earnings of the employee before the date of injury shall be taken to be the normal weekly earnings before that date of another employee performing comparable work, being normal weekly earnings from employment by the Commonwealth or a licensed corporation and calculated under subsection (1) or (2), as the case requires.
(5) Where, because of the shortness of the relevant period, the normal weekly earnings as calculated in relation to the relevant period under subsection (1) or (2) would not fairly represent the weekly rate at which the employee was being paid in respect of his or her employment before the injury, the normal weekly earnings before the date of the injury shall be calculated in relation to such other period as Comcare considers reasonable for the purpose of arriving at an amount that does fairly represent the weekly rate at which the employee was being so paid.
18 Section 8(5) will require specific attention in the present case. One particular issue which may require attention in a particular case is whether the "other period" which may be selected involves an extension of the two-week period stipulated by s 9(1), or permits the selection of a different period, not terminating at the date of the injury.
19 Before attention is given to that question, however, some points should be made about s 8(5), in the context in which it appears.
20 Both s 8(4) and s 8(5) are directed to the possibility that a period of two weeks is too short to yield a fair outcome resulting from the calculation directed by s 8(1) (or s 8(2) which deals with overtime earnings). In the case of s 8(4) the difficulty is the impracticability of calculating normal weekly earnings before an injury, in which case earnings of a comparable employee are to be used. Section 8(5) concerns the possibility that a calculation made using the two-week period directed by s 9(1) would not "fairly represent" the normal weekly earnings of an injured employee. Examples given in argument were employees working on swinging shifts (i.e. some weeks on/some weeks off) and casual employees with uneven working hours.
21 In such a case (and the examples above do not limit the possibilities) it is open to the decision-maker to select another period for the purpose of the calculation. However, it must be emphasised that the period selected is to be used specifically for the purposes of the calculation in s 8(1) or s 8(2). That is to say, an average number of weekly hours worked during the period selected must be multiplied by the average ordinary time rate of pay during that period.
22 One question which may arise is that posed earlier. Is it open to select a different period altogether, or must the period selected be an extension of the two-week period directed by s 9(1), i.e. a period terminating at the date of injury. In any consideration of that question, the operation of the whole of s 9 must be taken into account.
23 In particular, the operation of s 9(1) must be considered in the light of the adjustments directed by s 9(2), (3) and (4). Section 9(1) was set out earlier, but for convenience s 9 is set out here in its entirety:
9 Relevant period
(1) For the purposes of calculating the normal weekly earnings of an employee before an injury, a reference in section 8 to the relevant period is, subject to this section, a reference to the latest period of 2 weeks before the date of the injury during which the employee was continuously employed by the Commonwealth or a licensed corporation.
(2) Subject to subsection (3), if, during the period referred to in subsection (1), the minimum amount per week payable to an employee in respect of his or her employment by the Commonwealth or a licensed corporation was varied as a result of:
(a) the operation of a law of the Commonwealth or of a State or Territory; or
(b) the making, alteration or operation of an award, order, determination or industrial agreement, or the doing of any other act or thing, under such a law;
any part of that period that occurred before the variation, or last variation, took place shall be disregarded for the purposes of calculating the relevant period.
(3) Where in any case the application of subsection (2) would require that a period be disregarded for the purposes of calculating the relevant period in relation to an employee, and as a result of disregarding that period:
(a) it would be impracticable to calculate under section 8 the normal weekly earnings of the employee before an injury; or
(b) the normal weekly earnings as so calculated would not fairly represent the weekly rate at which the employee was being paid in respect of his or her employment by the Commonwealth or a licensed corporation before the injury;
subsection (2) shall not apply in that case, but the normal weekly earnings of the employee during that period shall be taken to be the amount that would have been his or her normal weekly earnings during that period if the variation had taken effect at the beginning of that period.
(4) If, during any part of the period calculated under the preceding subsections, the employee's earnings were reduced, or the employee did not receive any earnings, because of absence from his or her employment for any reason, that part of that period shall be disregarded for the purposes of calculating the relevant period.
24 Section 9(2) has the effect, broadly speaking, that if a legally required increase is made to a rate of pay during the "relevant period" (i.e. the period beginning two weeks before injury), then the pre-increase part of the period is disregarded. Section 9(3) has the effect, again broadly speaking, that if such an adjustment (i.e. disregarding a pre-increase part of a period) would make it impracticable to calculate normal weekly earnings under s 8, or such calculated earnings would not fairly represent normal weekly earnings, then it is presumed that the variation took effect for the whole of the two-week period.
25 In the case of both s 9(2) and s 9(3) the consequence is, in one way or the other, that the injured employee has the benefit, when the calculation under s 8 is made, of the increase to the rate of pay represented by the variation.
26 Section 9(4) is directed to two different circumstances. It should be noted, first, that the possibilities to which s 9(4) is directed concern only "the period calculated under the preceding subsections". That is to say, the period of two weeks directed by s 9(1) or the lesser period arising from the operation of s 9(2) (where it applies - c.f. s 9(3)).
27 Accordingly, s 9(4) allows periods of reduced earnings, or no earnings, during the two week (or lesser) period to be disregarded.
28 If, nevertheless, earnings calculated by reference to the remaining parts of the two-week period are fairly representative of the weekly rate at which the employee was being paid before the injury, the calculation proceeds in accordance with s 8(1) or s 8(2). If the period is too short, so that the normal weekly earnings calculated in that way would not fairly represent the weekly rate at which the employee was being paid, then s 8(5) remains available to permit the selection of some other period. It is important to emphasise, however, that the judgment to be made under s 9(4) is to be made before, not after, the engagement of s 8(5) because it must be made only in relation to the period directed by s 9, and not some alternative period selected under s 8(5).
29 What period may be selected under s 8(5)? It must obviously be one which meets the purpose of the calculation in which it will be used. That is to say, it must yield a fairly representative average of weekly working hours pre-injury and a fairly representative ordinary time rate of pay pre-injury so that a reliable calculation of normal weekly earnings pre-injury might be made for the purpose of s 19.
30 Subject to that overriding requirement (and to the proper engagement of s 8(5)) there does not appear to be any reason why the particular period chosen must terminate at the date of injury, although that would obviously be a possibility which the decision-maker might adopt.