Civil Procedure Act 2005

At any stage of proceedings, the court may order—

that any document in the proceedings be amended, or

that leave be granted to a party to amend any document in the proceedings.

Subject to section 58, all necessary amendments are to be made for the purpose of determining the real questions raised by or otherwise depending on the proceedings, correcting any defect or error in the proceedings and avoiding multiplicity of proceedings.

An order under this section may be made even if the amendment would have the effect of adding or substituting a cause of action that has arisen after the commencement of the proceedings but, in that case, the date of commencement of the proceedings, in relation to that cause of action, is, subject to section 65, taken to be the date on which the amendment is made.

If there has been a mistake in the name of a party, this section applies to the person intended to be made a party as if he or she were a party.

This section does not apply to the amendment of a judgment, order or certificate.