A last wishes letter occupies a particular space in Canadian estate law: recognised in practice and valued by the courts, yet deliberately kept outside the formal machinery of succession. Estate law is provincial, governed by statutes such as Ontario's Succession Law Reform Act, British Columbia's Wills, Estates and Succession Act, Alberta's Wills and Succession Act and Manitoba's The Wills Act. These set out what makes a will valid: writing, signature at the end by the testator, and attestation by two witnesses present at the same time who take no benefit. A last wishes letter answers to none of these execution rules, because it is not a will and is not meant to be one.
That non-binding character is the heart of the matter. A letter of wishes creates no legal obligation on your executor to follow its suggestions, and it forms no part of your will or any trust. It carries a strong moral pull and is a relevant consideration when an executor exercises discretion, but the executor stays bound by the will, not by the letter. If the two ever conflict, the will governs and the letter yields. This is why a well-drafted letter states plainly that it is non-binding, avoids commanding language, and never purports to give away assets of real monetary value, which belong in the will. The same logic applies to capacity planning, where a power of attorney for the common-law provinces handles decisions the letter cannot.
One provincial wrinkle deserves attention. In British Columbia, section 58 of the WESA lets a court treat a non-compliant record as a valid testamentary document if it represents the deceased's fixed intention to dispose of property on death. A letter drafted in imperative, gift-giving terms could, in that province, be argued into something it was never meant to be. The fix is careful wording and a clear statement of non-binding intent. The federal government's overview of Justice Canada guidance on wills and estate matters is a sound starting point for the provincial differences.