When does a power of attorney take effect?

What the Law Says

California law distinguishes between durable and non-durable powers of attorney and allows for both immediate and 'springing' (delayed) effectiveness. The timing depends on how the document is drafted and whether it meets statutory formalities.

Under California Probate Code § 4120, a power of attorney is effective upon execution — meaning when the principal signs it — unless the document states otherwise. This means most POAs are effective right away, even if the principal is still capable.

A 'springing' power of attorney — one that becomes effective only upon a future event like the principal’s incapacity — is permitted under § 4121, but only if the document explicitly states the triggering condition and includes specific language required by law.

For a springing POA to be valid, § 4121(a) requires the document to state: 'This power of attorney shall become effective upon the incapacity of the principal.' It must also be signed and acknowledged before a notary public — no witness signatures suffice for springing POAs.

All powers of attorney granting authority over real property must be notarized (Probate Code § 4122), and durable POAs must contain the statutory durability language: 'This power of attorney shall not be affected by my subsequent incapacity' (§ 4124).

Statutory Text

A power of attorney is effective upon its execution unless the power of attorney provides that it becomes effective at a future time or upon the occurrence of a future event or contingency.

— Probate Code § 4120 — When power of attorney becomes effective

Statutory Text

A power of attorney that becomes effective upon the incapacity of the principal is valid only if the power of attorney contains the statement: 'This power of attorney shall become effective upon the incapacity of the principal.'

— Probate Code § 4121(a) — Springing power of attorney

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