Arizona Execution Rules
A codicil must be executed with the same formalities as the will it amends. That generally means the testator's signature plus two witnesses under A.R.S. 14-2502, or a fully handwritten and signed codicil under the holographic will rules.
Why Restatements Are Often Better
Multiple codicils stacked over the years can contradict each other and trigger probate disputes. For more than a small change, attorneys typically recommend a fully restated will. The new will revokes all prior wills and codicils and provides a single, clean document for the personal representative to follow.