Washington Power of Attorney Laws: Durable, Medical, and Financial POA (2026)

Washington adopted the Uniform Power of Attorney Act (UPOAA) in 2016, codified at RCW 11.125, which took effect January 1, 2017. Unlike the standard UPOAA model, Washington's version requires the principal to include explicit durability language for a power of attorney to survive incapacity. Without that language, the authority ends when the principal becomes incapacitated. Execution requires the principal's signature plus either notarization or two qualified witnesses. Financial and health care authority can both be granted within a single POA document under RCW 11.125, and Washington's Natural Death Act (RCW 70.122) provides a separate directive instrument for end-of-life treatment decisions.

What a Power of Attorney Does in Washington

A power of attorney is a written document in which a principal grants authority to an agent (also called an attorney-in-fact) to act on the principal's behalf in legal, financial, or medical matters. The scope of that authority is defined entirely by what the document says.

Under Washington's UPOAA, a POA is effective immediately when executed unless the document provides that it becomes effective at a later date or upon a specified event (RCW 11.125.090). A principal may create a springing POA that activates only upon incapacity, but doing so requires affirmative language; the default is immediate effectiveness.

An agent who accepts appointment acts as a fiduciary. That duty runs to the principal and requires the agent to act in good faith, within the scope of granted authority, and in accordance with the principal's reasonable expectations. A POA cannot grant authority that exceeds what the principal possesses, and it ends at the principal's death. After death, the estate's personal representative takes over and the agent's authority ceases.

Washington law allows institutions such as financial firms, along with individuals, to serve as agents when authorized by the document.

Durable Power of Attorney in Washington

Under RCW 11.125.040, a power of attorney terminates when the principal becomes incapacitated unless the document contains language showing the principal's intent that the authority continue. Acceptable language includes phrases such as: "This power of attorney shall not be affected by disability of the principal" or "This power of attorney shall become effective upon the disability of the principal," or any words of similar import.

This is a departure from the model UPOAA, which makes POAs durable by default. Washington's legislature retained the requirement that durability be affirmatively expressed. If a principal wants the agent to be able to act during periods of incapacity, the point in time when a POA is most needed, the document must include that language.

A durable POA created before January 1, 2017 that contained proper durability language continues to be valid under RCW 11.125.040, which expressly applies the rule to instruments created before and after that date.

A springing durable POA, one that is dormant until the principal becomes incapacitated and then activates, is also permitted. Under RCW 11.125.090, if no person is authorized in the document to determine incapacity, it is established by a written determination from a physician or licensed psychologist who has personally examined the principal and is unrelated to the principal or agent by blood or marriage, or by a judge or appropriate governmental official.

How to Create a Valid Washington Power of Attorney

RCW 11.125.050 sets out the execution requirements. A Washington POA must be signed and dated by the principal, and the signature must be authenticated by one of two methods:

Notarization. The principal's signature is acknowledged before a notary public or other individual authorized by law to take acknowledgments.

Two witnesses. The signature is attested by two or more competent witnesses who subscribe their names while present with the principal and at the principal's direction or request.

A principal who cannot sign physically may execute the document by mark under RCW 11.12.030, or, if unable to make a mark, through the method provided in RCW 64.08.100.

Disqualified Witnesses

Not everyone may serve as a witness. RCW 11.125.050 disqualifies individuals who are:

• Home care providers for the principal.
• Care providers at an adult family home or long-term care facility where the principal resides.
• Related to the principal or the named agent by blood, marriage, or state registered domestic partnership.

The named agent is therefore doubly disqualified: the relationship-to-agent exclusion bars anyone related to the agent by blood, marriage, or domestic partnership from serving as a witness, and a conflict-of-interest concern applies to the agent directly. Choosing disinterested witnesses with no family connection to either the principal or the agent, and no stake in the principal's care arrangement, is the safer practice.

RCW 11.125.050(3) provides that a signature on an acknowledged POA is presumed genuine, which makes notarization the more reliable option for third-party acceptance. RCW 11.125.190 separately allows a good-faith third party relying on an acknowledged POA to treat the document as valid without further investigation, even if the POA is later found to be void or has been terminated. Financial institutions and title companies may request a notarized document before accepting an agent's authority.

What a Washington Agent Can and Cannot Do

Agent Duties

An agent who accepts appointment under a Washington POA takes on fiduciary obligations under RCW 11.125.140. Unless the POA provides otherwise, the agent must:

• Act only within the scope of granted authority.
• Act in good faith and in accordance with the principal's reasonable expectations.
• Act loyally for the principal's benefit and avoid conflicts of interest.
• Exercise the care, competence, and diligence ordinarily expected of agents in similar circumstances.
• Keep accurate records of all receipts, disbursements, and transactions.
• Cooperate with persons authorized to make health care decisions for the principal.
• Attempt to preserve the principal's estate plan where consistent with the principal's best interests.

An agent who possesses or represents special skills is held to a higher standard. Good-faith compliance with these duties protects the agent from personal liability for declines in asset value and for good-faith actions that happen to also benefit the agent.

At the principal's request or by court order, the agent must account for all actions taken within any period the principal specifies (RCW 11.125.140).

Hot Powers Requiring Express Authority

RCW 11.125.240 lists powers that an agent may NOT exercise unless the document expressly grants each one. These hot powers include:

1. Create, amend, revoke, or terminate an inter vivos trust.
2. Make a gift.
3. Create or change rights of survivorship.
4. Create or change a beneficiary designation.
5. Delegate agent authority.
6. Waive the principal's right to be a beneficiary of a joint and survivor annuity, including retirement plan survivor benefits.
7. Exercise fiduciary powers the principal holds the authority to delegate.
8. Exercise a power of appointment in favor of anyone other than the principal.
9. Create, amend, or revoke a community property agreement.
10. Cause a trustee to make distributions from a trust.
11. Make provisions for nonprobate transfer at death through nontestamentary instruments.
12. Make health care decisions for the principal or give informed consent to health care.

A general grant of authority is not sufficient for any item on this list. Each must be specifically authorized in the document.

What Agents Cannot Do

An agent cannot act after the principal's death, cannot make or change a will, cannot transfer the principal's authority to another person unless the POA expressly permits delegation, and cannot act in a way that benefits the agent at the expense of the principal's interests. Authority granted in a POA is also subject to any applicable ethical and legal constraints on the underlying transaction.

Health Care Directives in Washington

Washington handles health care authority through two overlapping frameworks.

Health Care Agent Under RCW 11.125

A principal may grant an agent authority over health care decisions within the POA document by including express authorization under RCW 11.125.400. When a POA includes general health care authority, the agent may access the principal's health care information under HIPAA and provide informed consent for health care decisions on the principal's behalf. Mental health treatment decisions require compliance with chapter 71.32 RCW, and where multiple agents hold conflicting mental health authority, the most recently appointed agent governs.

Certain individuals are prohibited from serving as a health care agent under RCW 11.125.400 unless they are the principal's spouse, state registered domestic partner, parent, or adult sibling or child. This prohibition covers the principal's physicians, their employees, and the owners, administrators, or employees of a health care facility or long-term care facility where the principal resides or receives care.

Natural Death Act Directive Under RCW 70.122

Separately, Washington's Natural Death Act, RCW 70.122, allows an adult to execute a written directive instructing a physician to withhold or withdraw life-sustaining treatment if the declarer is in a terminal condition or a permanent unconscious condition.

A valid directive under RCW 70.122.030 must be signed by the declarer and either acknowledged before a notary public or signed in the presence of two witnesses who are not related to the declarer by blood or marriage, would not inherit from the declarer's estate, and are not the attending physician, a health facility employee, or any person with a claim against the declarer's estate.

The directive must be made part of the patient's medical records. Washington maintains a health care declarations registry under RCW 70.122.130 where directives may be filed. A directive executed in another jurisdiction that complies with Washington law or the law of the place of execution is valid in Washington.

The Natural Death Act directive and a health care agent designation under RCW 11.125 serve different but complementary purposes: the directive controls specific treatment preferences in defined clinical situations, while the health care agent has broader authority to make real-time medical decisions consistent with the principal's wishes.

Revoking or Ending a Washington Power of Attorney

Under RCW 11.125.100, a Washington power of attorney terminates when any of the following occurs:

• The principal dies.
• The principal becomes incapacitated, if the POA is not durable.
• The principal revokes the POA.
• The POA document provides that it terminates on a specified date or event.
• The purpose of the POA is accomplished.
• The agent dies, becomes incapacitated, or resigns, and no successor agent is named.

An agent's individual authority also ends if an action for dissolution or annulment of the agent's marriage or state registered domestic partnership with the principal is filed, unless the document otherwise provides.

A principal who has capacity may revoke a POA at any time. Revocation should be done in writing and communicated to the agent and to any third parties relying on the document. If a third party does not know that a POA has been revoked and acts in good faith under the prior document, that action binds the principal and the principal's successors in interest under RCW 11.125.100.

Executing a new POA does not automatically revoke an earlier one. To avoid two documents being in force simultaneously, the new instrument should expressly state that all prior powers of attorney are revoked.

For a broader overview of how powers of attorney work across all states, see our national Power of Attorney guide.

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This page provides general legal information about Washington power of attorney laws and is not legal advice. Washington estate planning involves individual circumstances that an attorney licensed in Washington can assess. Consult a qualified Washington attorney before executing or relying on a power of attorney document.

Last reviewed: May 2026. Governing statutes: RCW 11.125 (Uniform Power of Attorney Act, effective January 1, 2017) and RCW 70.122 (Natural Death Act).