After an Alzheimer's diagnosis, review five documents right away: a durable power of attorney for finances, a durable power of attorney for health care, a living will (advance directive), a last will, and often a revocable living trust. The Alzheimer's Association and the National Institute on Aging both name these as the core legal documents to plan for after a dementia diagnosis. Alzheimer's is a progressive brain disease that gradually erodes memory, judgment, and the ability to make decisions. The reason to act now is legal, not emotional: most of these documents must be signed while the person still has the capacity to understand them, and that window can close quickly.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- The five documents to pull first
- Why timing is the whole ballgame
- How "capacity" is actually judged
- What happens if you skip a durable power of attorney
- State rules vary — check yours
- The scale behind the urgency
- Frequently Asked Questions
The five documents to pull first
Start by locating what already exists and identifying what is missing. Each document does a different job, and the person can only create them while they still legally understand what they are signing. The National Institute on Aging explains that advance directives and financial documents serve separate functions: health-care documents guide medical care, while a power of attorney and trust govern money and property.
- **Durable power of attorney for finances** — names someone to manage money, bills, and property. "Durable" means it stays valid after the person loses capacity.
- **Durable power of attorney for health care** (health-care proxy) — names someone to make medical decisions.
- **Living will / advance directive** — records wishes about treatments like resuscitation and life support.
- **Last will** — directs how property is distributed after death.
- **Revocable living trust** — lets a chosen trustee hold and distribute assets, often avoiding probate.
Why timing is the whole ballgame
Financial and legal documents must be created while the signer still has legal capacity. A durable power of attorney names a decision-maker; a living trust lets a trustee manage assets — but neither can be signed once capacity is gone. Here is the part many families miss: a diagnosis alone does not erase legal capacity.
The Alzheimer's Association notes that early-stage patients can still validly sign wills and powers of attorney if they understand the document and its consequences at the moment they sign. The risk of waiting is concrete. If capacity is lost before documents are signed, the family may face court-ordered guardianship or conservatorship — a slow, costly process. Capacity present today may be gone within months, so treat these signings as time-sensitive.
How "capacity" is actually judged
Capacity is not a single yes-or-no label. It is a functional, moment-specific test tied to the particular decision being made. To sign validly, the person generally must understand three things: what they own, who their family and beneficiaries are, and the purpose and consequences of the document in front of them.
Someone can meet this bar for a simple document on a good morning and fall short later the same day. Because the standard is specific, the Alzheimer's Association recommends confirming capacity through the treating physician or an elder-law attorney. A neuropsychologist can assess it, or the attorney can evaluate and document it at signing — a record that helps if anyone later challenges the document.
What happens if you skip a durable power of attorney
Of the five documents, the durable power of attorney for finances is often the most urgent. Without it, no one has clear legal authority to pay bills, manage accounts, or handle property once the person cannot.
The alternative is guardianship: a court appoints someone to make decisions, usually after hearings, fees, and ongoing reporting. A durable power of attorney signed before incapacity is the main way to avoid that outcome.
State rules vary — check yours
The specifics are set by state law and differ meaningfully. Who may witness a signing, the exact capacity standard, and the procedures for powers of attorney and guardianship all change from state to state. This matters for practical steps.
A power of attorney form valid in one state may need re-execution after a move, and witness or notary requirements differ. The National Institute on Aging stresses that a durable power of attorney must be signed before incapacity to keep guardianship off the table. An elder-law attorney licensed in your state is the reliable way to get the details right.
The scale behind the urgency
This is not a rare situation. The Alzheimer's Association reports that an estimated 7.2 million Americans age 65 and older live with Alzheimer's in 2025 — the first year above 7 million — supported by roughly 13 million unpaid caregivers. For a practical starting point, the NIA's checklist for planning after a dementia diagnosis lists the documents to gather and the decisions each one records.
Frequently Asked Questions
Can someone with early Alzheimer's still sign a will?
Often yes. If they understand what they own, who their beneficiaries are, and the document's consequences at the moment of signing, the signature can be valid.
What is the difference between a living will and a durable power of attorney for health care?
A living will records treatment wishes; a health-care power of attorney names a person to make medical decisions when the patient cannot.
What if capacity is already lost?
The family likely needs court-ordered guardianship or conservatorship to gain legal authority, since the documents can no longer be signed.
