What is a power of attorney?
A power of attorney (POA) is a legal document that lets you (the principal) name someone you trust (the agent, or attorney-in-fact) to make decisions and act on your behalf, per Cornell Law School's Legal Information Institute.
Depending on the type, that can mean managing your finances, signing a specific document, or making medical decisions if you can't.
A durable POA stays in effect if you become incapacitated, which is the whole point for most people planning ahead. A non-durable POA ends if you lose capacity, and a springing POA only starts when a triggering event (like incapacity) occurs.
Most states now base their POA statutes on the Uniform Power of Attorney Act (UPOAA), adopted in some form by more than 30 states, which makes a POA durable by default unless the document says otherwise, and requires notarization for the document to be reliably accepted.
When do you need one?
Planning ahead in case illness or injury leaves you unable to manage your affairs
Letting someone handle a car title, closing, or bank matter while you're away
A parent authorizing a caregiver to make decisions for a minor child
Managing an aging parent's finances or medical care
Handling a one-time transaction you can't attend in person
What it should include
Who, the principal's and agent's full legal names and addresses
What powers, the specific authority granted, broad or limited to one task
When, whether it's effective immediately, springing, and whether it's durable
Successor agent, a backup if your first choice can't serve
Limits, anything the agent may not do (gifts, changing beneficiaries)
Signatures, yours, the agent's acceptance, and a notary and witnesses where your state requires
Durable, springing, or non-durable?
'Durable' means the POA survives your incapacity, essential for planning. 'Springing' takes effect only on a defined event, which adds a proof step. A plain POA ends the moment you lose capacity, which is usually not what people want.
Medical POA, living will & advance directive, how they fit
These three healthcare documents work as a family. A medical (healthcare) power of attorney names a person, your agent or proxy, to make medical decisions if you can't. A living will doesn't name anyone; it records your own treatment wishes (CPR, ventilation, tube feeding), mostly for end-of-life care.
An advance directive is the umbrella document that combines both, an agent plus your wishes in one form, and it's the standard statutory form in most states.
Where your living will and your agent conflict, your written instructions generally control, and the agent decides what the living will doesn't cover.
A handful of states keep the living will and healthcare proxy as separate forms, and Massachusetts, Michigan, and New York have no living-will statute at all, there, the healthcare proxy is the operative document.
Your agent's legal duties, and how to prevent abuse
An agent under a POA is a fiduciary: legally bound to act in the principal's best interest, not their own. The Consumer Financial Protection Bureau's "Managing Someone Else's Money" guide lays out four core duties every agent takes on. Act only in the principal's interest, manage their money and property carefully, keep the principal's funds separate from the agent's own, and keep complete, accurate records that can be reviewed later.
The CFPB estimates that roughly 22 million Americans age 60 and older have named a financial power of attorney, and POA abuse is one of the most common forms of elder financial exploitation.
You can reduce the risk by naming a successor agent, requiring the agent to provide regular accountings to a third party (like another family member or your attorney), and keeping the original document somewhere the agent can't unilaterally alter it.
Power of attorney for taxes (IRS Form 2848)
A general or durable POA usually isn't enough to let someone represent you before the IRS. For that, the IRS requires its own form: Form 2848, Power of Attorney and Declaration of Representative.
It authorizes a specific, IRS-eligible representative (an attorney, CPA, or enrolled agent, among others) to receive your confidential tax information, sign certain consents, and speak with the IRS on your behalf for the tax matters and years you list.
It doesn't remove your own responsibility for what's filed, and it's separate from the durable POA you'd use for banking or medical decisions.
How to revoke a power of attorney
A POA is revocable any time you have capacity, unless it's been made irrevocable by its own terms (rare). To revoke one: put the revocation in writing, sign and, where your state expects it, notarize it. Then deliver copies to the agent and to every institution, bank, hospital, or title company that has a copy or might rely on the old one.
Verbal revocation or simply destroying your copy isn't reliable, the agent or a bank may still act on a copy they were given earlier. A new POA doesn't automatically cancel an old one unless it says so, so state explicitly that all prior powers of attorney are revoked.
Common mistakes to avoid
Using a non-durable form when you meant it to survive incapacity
Skipping the notary or witnesses your state requires (which voids it)
Granting powers so broad you didn't intend, with no limits
Not naming a successor agent
Forgetting that a POA ends at death, an executor takes over then
Assuming a financial POA lets someone represent you before the IRS without a separate Form 2848
Revoking a POA verbally or informally instead of in writing, delivered to everyone who relied on it