My present impression is that sentencing judges at first instance, in fixing a new single non-parole period, have in general fixed one intended to commence on the date of their sentence. But in my opinion they are not constrained to do this by s17(1) or for any other reason. No doubt a non-parole period fixed under s11, and a new single non-parole period fixed under s14, is commonly understood to be part of the sentence. Indeed, s11(1) and s11(2) speaks of a non-parole period as part of the sentence. And of course an order under s11 or s14 is a "sentence" for appeal purposes: Crimes Act 1958, s566. But it does not follow from this that a new single non-parole period must be regarded as a "sentence of imprisonment" for the purposes of the provisions of s17(1) of the Sentencing Act, whereby in general a sentence of imprisonment commences on the day it is imposed. Where the requirements of para(a) and para(b) of s14(1) are satisfied, the court must fix a new single non-parole period in respect of all the sentences the offender is to serve or complete. By s14(2) this supersedes the previous non-parole period and must not be such as to render the offender eligible to be released on parole earlier than would have been the case if the further sentence had not been imposed. Leaving aside for the moment the suggested effect of s17(1), there are obviously two ways in which a judge might proceed in fixing the new period under s14. The first is fix the new period by reference to the date of the sentence in respect of which the earlier non-parole period was fixed, that is to say, fix it as a period to run from that date. The second is to fix the new period by reference to the date on which the new sentence is being passed, that is, as running from that date. These two ways of proceeding differ only in form: there is no difference in substance. For whichever way the court proceeds, it is, in fixing the new period, simply determining what total period will have to be served in respect of both sentences before eligibility for parole.
If we were to adopt the view that s17(1) does not enable a non-parole period to be fixed which commences on a date earlier than that on which sentence is passed by the judge fixing it, the outcome in practical terms would be the same, since, as I have said, the difference is one of form only. We would in this case merely fix a different, and much shorter, period, running from a later date, which would give effect to the sentencing judge's intention in fixing the non-parole period. But we need not do this. For in my view s17(1) does not prevent the fixing of a new non-parole period commencing on the date on which the earlier sentence was pronounced. I say this because in my view a new single non-parole period is not a "sentence of imprisonment" within the meaning of s17(1), notwithstanding that the order fixing it forms part of the sentence. The sentence of imprisonment is the custodial sentence: a new non-parole period is merely the period fixed during which there shall be no eligibility for parole ...[16]