Hi there. It is not clear what you mean by ‘attestation letter’. Under Australian law, there is not a special type of legal document by this name.

To ‘attest’ means to confirm or provide evidence of something. You may have been asked to write or obtain a letter that attests to a particular fact or series of events. For example, employers or government agencies may ask for a letter attesting to the character of a person, such as a future employee, or a particular state of affairs. If you have been asked to provide such a letter, it does not need to be in any special legal form. You should contact the person or organisation that requested the letter to confirm the form in which they want it.

In the context of wills and estates law, a person’s will may have what is known as an ‘attestation clause’. This is a section of the will that records the circumstances in which the will was signed and witnessed. For example, if the person making the will is unable to read it or unable to physically sign it, then this information should be reflected in the attestation clause. In Queensland, attestation clauses are no longer required by law, but most wills will contain some kind of language that refers to the witnessing of the signing of the will.