Section 32(1) of the Supreme Court Act 1935 (WA) operates retrospectively to permit an award of pre-judgment interest on causes of action that accrued before the section came into effect on 20 June 1983, including in child sexual abuse actions brought under the CLLA Act 2018. Section 15B(3) of the Civil Liability Act 2002 (WA) does not limit the current office holder's liability to exclude pre-judgment interest that was not available when the cause of action originally accrued. When applying the 'rough and ready' method of calculating pre-judgment interest, the half interest rate should only be applied during the period losses are actually accruing; once the loss is complete, the full interest rate must be applied from that date to avoid systematic under-compensation. The question whether a defendant's historical immunity from suit is a relevant discretionary factor in awarding pre-judgment interest was left open.
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