Letters Testamentary: Definition and How It Works in California

By Eric Ridley, attorney, Ridley Law. Updated September 2026.

Letters testamentary are the court order that lets a named executor act for an estate: open accounts, sell property, and sign for the decedent under Prob. Code, § 8400 and following.

How it works in California

A will names an executor, but naming someone doesn’t give that person any legal authority on its own. The probate court has to admit the will and formally appoint the executor before letters testamentary issue. Prob. Code, § 8400 makes this explicit: nobody has power to administer the estate until appointed personal representative and that appointment becomes effective.

Once letters issue, the executor can present them to banks, title companies, and brokerages as proof of authority to act for the estate. Institutions usually want a recently certified copy, so executors often order several from the court clerk.

Why it matters

Banks and other institutions won’t deal with an executor who can’t produce letters testamentary, no matter how clear the will is. Say a will names a daughter as executor and leaves the family home to her and her brother equally. She can’t list the house for sale, or even confirm the mortgage balance, until she has letters in hand, even though everyone agrees on what the will says.

Common mistakes

Acting on the estate’s behalf before letters issue, such as closing accounts or distributing property, which can expose the named executor to personal liability. Ordering only one certified copy of the letters, which then has to be tracked down and passed between institutions instead of provided fresh to each one.

Related terms

• Executor: the person named in the will who receives letters testamentary.
• Letters of administration: the equivalent court order when there’s no will or no executor able to serve.
• Personal representative: the general term covering both an executor and an administrator.
• Probate: the court process that produces letters testamentary.
• Independent Administration of Estates Act: the law that lets a personal representative act without advance court approval.

Part of the California estate planning glossary. For the full treatment, see Letters Testamentary CA: Guide.