What is a power of attorney, actually?

A power of attorney (POA) is a document that lets someone else act on your behalf—talk to your doctors, move money in your bank account, sign things in your name. You gave that permission by signing it, and because you gave it, you can also take it back.

The two roles: principal and agent

Every POA has two people in it. The principal is the person granting the power—if your parents had you sign one, that’s you. The agent (sometimes called the “attorney-in-fact”) is the person receiving the power—often a parent.

Despite the word “attorney,” the agent is almost never a lawyer. “Attorney-in-fact” is old legal vocabulary for “someone authorized to act for you.” No law firm, no court, and no judge is involved in creating a POA—and none is involved in canceling one either.

What can an agent actually do?

It depends on the type of POA (there’s a full guide to the types), but broadly:

• A healthcare POA lets your agent talk to your doctors, see medical records, and make treatment decisions for you.
• A financial POA lets your agent deal with your money: bank accounts, taxes, leases, even signing contracts in your name.
• A general POA can cover both.

Institutions take these documents seriously. A bank shown a valid financial POA will generally let the agent act on the account as if they were you.

A normal tool that’s easy to overuse

POAs exist for good reasons—people use them when a family member is deployed overseas, hospitalized, or aging. Parents are often told to get one signed when a child turns 18, “just in case of emergencies.” Sometimes that’s genuinely practical. But the document doesn’t know the difference between an emergency and a Tuesday: it works whenever the agent chooses to use it.

POAs don’t expire on their own

This surprises a lot of people: most POAs have no expiration date. Turning 19, 21, or 30 doesn’t end one. Moving out doesn’t end one. Moving to a different state doesn’t end one. Unless the document itself sets an end date, it stays in force until you formally cancel it—which is called revocation, and it’s simpler than it sounds.