Late payment of an issued Payment Certificate by the employer entitles the contractor to default interest compounded monthly until payment has been made – Edition 6.1: Repo rate + 6%pa ||Edition 5.0: Repo rate x 160%

See: 6.1P-25.4.4; 5.0P-31.11; 5.1M-19.7; 4.0M-13.13