In Sampson v R (2025) NSWCCA 25, the New South Wales Court of Criminal Appeal clarified a narrow but consequential issue in sentencing practice under the Crimes (Sentencing Procedure) Act 1999 (NSW) (CSPA). The Court held that mandatory guilty-plea discounts applied under s 25D of the CSPA must be calculated and expressed with mathematical precision, and cannot be rounded to even months or years after calculation. The decision resolves uncertainty about whether courts may ad