What Constitutes A Formal Will In NSW? In New South Wales, a testator must execute a will correctly for the document to be considered a valid and formal will. Specifically, the document must comply with the following requirements: A formal will must be in writing; and The testator must sign the will, or someone else must sign on their behalf in the presence of the testator; and Two witnesses must watch the testator sign the document and sign the will themselves; and The testator must sign with the intention of executing the will, although the signature does not have to be at the end of the will; but The will does not have to have an attestation clause. Get More Information on Informal Wills in NSW