Post-judgment interest on all judgment debts, including awards of unliquidated damages against the Road Accident Fund, arises ex lege by operation of s 2(1) of the Prescribed Rate of Interest Act 55 of 1975 and runs automatically unless the court order expressly provides otherwise. Section 2A of the PRIA governs only pre-judgment interest on unliquidated claims; once judgment is given, the debt becomes a judgment debt under s 2(3) and is governed by s 2, not s 2A. Section 2A(5) is a permissive provision enabling courts to make fact-specific pre-judgment interest awards and does not require a specific court order before post-judgment interest becomes payable. Section 17(3)(a) of the Road Accident Fund Act 56 of 1996 modifies the general ex lege position by deferring the commencement of interest to 14 days after the date of the court order; it does not exclude the operation of s 2(1) of the PRIA. Post-judgment interest is a legal consequence, not a cause of action requiring adjudication; silence in a court order does not constitute an adverse determination and does not trigger res judicata. Judgment debt under s 2(3) of the PRIA includes orders as to costs; therefore, post-judgment interest accrues ex lege on costs orders. The prescribed rate of interest under s 1 of the PRIA, as amended in 2015, is determined by the statutory formula (repurchase rate plus 3.5%) and takes effect by operation of s 1(2)(c) based on SARB determinations; ministerial publication serves a confirmatory function and its absence does not prevent the rate from taking effect.