Section 9AA of the Sentencing Act 1995 (WA) exhaustively states the factors relevant to the guilty plea discount; the seriousness of the offending is not one of them and cannot be used to diminish the discount. The discount must be expressed as a single fixed percentage (not a range) and the sentencing judge must actually apply that percentage mathematically to the head sentence. The s 9AA discount, while applying only to individual sentences, should flow through to the total effective sentence to preserve the incentive to plead guilty at the first reasonable opportunity.
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