How do I properly update or change my will in Ontario?

There are two ways to update a will in Ontario: execute a formal codicil, or make an entirely new will. A codicil is a separate legal document that amends, adds to, or revokes specific provisions of an existing will. Like the original will, a codicil must be signed in front of two witnesses who meet Ontario's requirements, and it must be stored with the original will.

Making an entirely new will is generally the cleaner approach, especially when the changes are substantial or when you want to avoid any ambiguity about which document controls. A new will typically includes a revocation clause that expressly cancels all prior wills and codicils.

What you should never do is attempt to amend your will informally — crossing out text, writing in changes by hand, or adding sticky notes. These informal changes are not legally effective and can actually create confusion or cast doubt on the entire document. Even a small handwritten note in the margin of a typed will can cause problems in estate administration.

If you have a simple change to make and want to preserve the rest of your will intact, a codicil can work well. For anything more complex — a change of estate trustee, a new beneficiary, or a restructured distribution plan — a fresh will is usually the better choice.