Uniform Civil Procedure Rules 1999

If there are 2 or more defendants, the plaintiff may make an offer to settle with any defendant, and any defendant may offer to settle with the plaintiff.

However, if defendants are alleged to be jointly or jointly and severally liable to the plaintiff and rights of contribution or indemnity may exist between the defendants, this rule applies to the offer only if—

for an offer made by the plaintiff—the offer is made to all of the defendants and is an offer to settle the claim against all the defendants; or

for an offer made to the plaintiff—

the offer is an offer to settle the plaintiff’s claim against all the defendants; and

if the offer is made by 2 or more defendants, by the conditions of the offer the defendants who make the offer are jointly or jointly and severally liable to the plaintiff for the whole of the amount of the offer.