When illness or injury removes someone's ability to manage their own affairs, the law does not hand that authority to family automatically. Spouses cannot sign for each other's separate accounts. Adult children cannot direct a parent's care simply by being next of kin. The documents below grant that authority in advance, cheaply. Their absence is repaired only through a court guardianship process that is slow, public and expensive.
Financial power of attorney
A durable financial power of attorney names an agent to handle money and property: paying bills, managing accounts, dealing with insurers and agencies, selling property if needed. "Durable" is the essential word, meaning the authority survives incapacity, which is the entire point. It can take effect immediately or only upon incapacity ("springing"), though springing versions add friction at the worst time, since someone must certify the incapacity before banks will act.
Choose an agent for trustworthiness and diligence rather than seniority in the family, name a successor, and tell both where the document is. Banks can be slow to honor unfamiliar documents; some institutions prefer their own forms, and sorting that out while the principal is still able saves real trouble later.
Health care documents
A health care proxy (or medical power of attorney, the name varies by state) names who makes medical decisions when you cannot. A living will records your wishes about life-sustaining treatment so the proxy is guided rather than guessing. Together they are often called advance directives. A related HIPAA authorization lets doctors share information with the people you name, which matters even before any decision needs making.
These are state-specific forms, and every state publishes free statutory versions. They require witnessing or notarization per state rules, and no lawyer is necessary for standard situations, though blended families and conflict-prone situations benefit from one.
What these documents do not do
Powers of attorney end at death; they are the wrong tool for inheritance, which belongs to wills and beneficiary designations. A proxy cannot override a patient who still has capacity, and an agent under a financial POA is a fiduciary who must act in the principal's interest, with self-dealing both a civil and criminal matter.
Where families run into trouble
The document exists but nobody can find it. Originals in a safe deposit box that only the incapacitated person can open is a common and avoidable problem.
The bank refuses it. Institutions sometimes reject documents they consider stale or unfamiliar. Many will accept their own form signed alongside the general one, so completing bank-specific forms while the principal is well removes the obstacle entirely.
Siblings disagree. Naming co-agents who must act together sounds fair and creates deadlock. Name one agent and a successor, and if fairness matters, give a different sibling the health care role.
The agent keeps no records. An agent should hold funds separately, never commingle, and keep receipts. Family disputes over a parent's money frequently turn on whether anyone can account for it.
The order to do things
Sign them while healthy, review after major life changes, give copies to the named agents and doctors, and store originals somewhere the agents can reach without you. The National Institute on Aging publishes plain-language guidance on advance care planning, including links to state forms.