A “Calderbank” offer is a certain type of settlement offer. Often multiple settlement offers are made by both plaintiffs and defendants during the course or proceedings. A settlement offer, other than having the benefit of potentially settling a dispute, also has the benefit of attempting to protect your legal costs.
A Calderbank offer is derived from an old English Court of Appeal case Calderbank v Calderbank. In that case, the wife made a reasonable offer to settle the dispute. The husband rejected the offer, and the wife ended up with a better result at court. The judge considered that the husband was unreasonable by rejecting the offer.
Calderbank offers are now accepted in almost all disputes in Australia, but usually not in criminal proceedings.