Security for costs in arbitration proceedings This Practice Note considers the arbitral tribunal’s power to order security for costs under the Arbitration Act 1996 (AA 1996), which principally applies to arbitrations seated in England, Wales or Norther Ireland (England and English are used as a convenient shorthand). The notion of ‘security for costs’ will be familiar to common lawyers but perhaps less so to civil lawyers, as it is closely related to the common law rule that, in general, the costs of bringing proceedings should ‘follow the event’ or, put more simply, the losing party should pay. In English litigation, the general rule, if a court decides to make an order on costs, is that the unsuccessful party will be ordered to pay the recoverable costs of the successful party, although the court retains a wide discretion in this regard—see: Costs orders—overview. To bolster this principle, the mechanism of security for costs exists and allows a defendant (whether to the main claim or a counterclaim) to apply for an order that the claimant provides security for the likely recoverable costs the defendant will incur in defending the claim—see Practice