A party seeking to depart from Penalty Interest Rates Act rates under s 58(1) of the Supreme Court Act 1986 (Vic) must adduce evidence of appropriate alternative rates; the mere assertion that PIRA rates exceed market rates is insufficient. Sums payable under a contractual obligation are 'sums certain' within s 58(1) where they are capable of precise quantification by reference to books of account without requiring valuation, estimation or assessment by a court.
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