Updated August 3, 2026. Quick answer: a living will states what treatment you do and do not want. A healthcare proxy names a person to decide for you. They answer different questions, most states let you have both, and the proxy is the one that covers the situations you did not anticipate.
The difference in one line each
- Living will — instructions. It speaks for you about specific circumstances, usually terminal condition or permanent unconsciousness.
- Healthcare proxy (also called a healthcare agent, healthcare power of attorney, or surrogate designation) — a person. They decide, using your stated wishes as their guide.
Why the proxy usually matters more
Because medicine produces situations documents do not anticipate. A living will that addresses terminal illness says nothing about a temporary crisis with an uncertain prognosis — which is far more common. A named person can answer a question the document never contemplated.
The instructions still matter: they are what tells the proxy what you would have wanted, and they protect that person from having to guess while grieving. The combination is the point. Instructions without a decision-maker are rigid; a decision-maker without instructions is a person left carrying your decision alone.
The terminology is a genuine obstacle
States do not use the same words. The same instrument is a health care proxy in New York, a designation of health care surrogate in Florida, a patient advocate designation in Michigan, a directive to physicians in Texas, and a declaration in several others. Some states combine both functions into one document called an advance directive; others keep them separate with different execution rules for each.
Rhode Island is the clearest example of why that matters: its healthcare power of attorney accepts a notary or two witnesses, while its living-will declaration requires two witnesses with no notary alternative. Same state, two documents, two different execution rules. Your state’s own terminology and execution box.
What neither one does
Neither gives anyone authority over your money. That is a financial power of attorney, a separate document with separate execution rules. And neither is a medical order — a directive tells people what you want; it does not by itself direct a clinician in an emergency.
Related: all states compared · what they cost.
General information drawn from state statutes and official state materials, not legal or medical advice. Advance-directive law is STATE law and the execution requirements differ in ways that decide whether a document works: some states require witnesses AND a notary, some accept either, and the list of people who may not witness varies. A directive executed the wrong way may not be honoured when it matters. Many states publish a free official form – you should not have to buy one.