What a Power of Attorney Can and Cannot Do With a Will
A person with power of attorney cannot change, write, or revoke a will on behalf of the person who gave them that power. Power of attorney is designed to handle financial and medical decisions while someone is alive. A will only takes effect after death, and the law treats these as completely separate documents with different rules.
The person with power of attorney — called the agent or attorney-in-fact — can manage bank accounts, pay bills, sell property, and make healthcare choices. But they have no authority over what happens to the estate after death. That authority belongs to whoever the will names as executor, or to the probate court if there is no will.
This separation exists because a will is a deeply personal document that reflects the wishes of the person who wrote it. The law assumes that only that person — not someone acting on their behalf — should decide who inherits their property.
Key Takeaways
- Power of attorney does not include the power to change or create a will, even if the document says the agent has "broad" or "unlimited" powers.
- An agent with power of attorney can manage the person's money and property while they are alive, but cannot control what happens to the estate after death.
- If someone with power of attorney tries to change a will, the change can be challenged in court and will likely be overturned.
- A will must be signed by the person whose will it is, with witnesses present, following state law — power of attorney cannot replace this requirement.
- If the person with power of attorney wants to change their own will, they can do so at any time, but this does not affect the principal's will.
Why Power of Attorney Does Not Cover Wills
Power of attorney is a legal tool that lets one person (the principal) authorize another person to act on their behalf. The agent can only exercise the powers that the document explicitly grants. Even if the power of attorney says the agent has "all powers" or "full authority," courts interpret this to mean all powers during the principal's lifetime.
A will is different because it is a testamentary document — meaning it only becomes active after the person dies. At that point, the agent's power of attorney automatically ends. The law does not allow one person to make binding decisions about another person's inheritance, because doing so could create opportunities for fraud or abuse.
State law is clear on this point. Most states have adopted the Uniform Power of Attorney Act, which explicitly states that an agent cannot make, revoke, or change a will. Even in states that have not adopted this uniform law, courts have consistently ruled the same way.
What Happens If Someone With Power of Attorney Tries to Change a Will
If an agent attempts to change, forge, or create a will using their power of attorney, the change is not legally valid. The original will (or the lack of a will) stands. The person who tries to make this change can face serious consequences.
Family members or the executor named in the original will can challenge the forged or altered document in probate court. The court will examine how the document was signed, whether the principal was present, and whether the principal's signature is genuine. If the court finds that the agent acted without authority, it will reject the change.
In some cases, attempting to change a will through power of attorney can result in criminal charges for fraud or forgery. The agent could also be sued for breach of fiduciary duty — the legal obligation to act in the principal's best interest, not their own.
How to Change a Will Properly
The person whose will it is must change it themselves, following their state's legal requirements. In most states, this means either signing a new will or signing an amendment called a codicil.
A new will must be signed by the person, dated, and witnessed by at least two people (the number varies by state). The witnesses must watch the person sign and understand that they are signing a will. The person should also initial each page and have the witnesses initial as well.
A codicil is a shorter document that changes one or more parts of an existing will without replacing the whole thing. It follows the same signing and witnessing rules as a will. After a codicil is signed, the original will and the codicil together form the complete estate plan.
If the person lacks the mental capacity to sign a new will or codicil, they cannot change their will — even with power of attorney in place. In this situation, the existing will remains in effect. If there is no will and the person cannot make one, the state's intestacy laws determine how the estate is divided.
When an Agent Might Need to Act on Estate Matters
An agent with power of attorney may need to manage the principal's finances right up until death. This could include paying final medical bills, funeral expenses, or taxes owed by the estate. But this is different from changing the will.
Once the principal dies, the power of attorney ends when ready. From that point forward, the executor named in the will (or the administrator appointed by the court if there is no will) takes over. The executor handles the estate according to the will's instructions, not according to what the agent with power of attorney might have wanted.
If the agent and the executor are the same person, that person must switch roles. They stop acting under power of attorney and start acting as executor. The rules that govern an executor are different and stricter than the rules for an agent with power of attorney.
Protecting a Will From Unauthorized Changes
If you are concerned that someone with power of attorney might try to change your will, there are steps you can take. Keep your will in a safe place — a safe deposit box, a fireproof safe at home, or with your attorney. Tell your executor where the will is located and how to access it.
You can also register your will with your state's will registry, if your state offers one. This creates an official record that your will exists and where it is stored. When you die, the executor or family members can search the registry to find it.
Consider discussing your estate plan with your agent and your executor so they understand your wishes. If you are worried about conflict, you can name different people for these roles. Your agent handles your finances while you are alive; your executor handles your estate after you die.
If you suspect that someone has forged or altered your will, or if you want to revoke a will that you no longer trust, you can sign a new will at any time. The new will automatically revokes the old one (as long as the new will says so). This is the clearest way to make sure your true wishes are recorded.
State-Specific Rules and Variations
While the basic rule — that power of attorney does not cover wills — is the same across all states, some details vary. A few states allow an agent to make a will on behalf of the principal only in very narrow circumstances, such as when the principal is physically unable to sign but is mentally capable and directs the agent to do so. Even then, strict requirements explore, and the will must be witnessed and notarized.
Some states have adopted the Uniform Power of Attorney Act, which provides a standard set of rules. Others have their own power of attorney statutes. If you are the agent and you are unsure whether you have authority over a particular matter, check your state's law or ask an attorney.
The same applies if you are the principal and you want to make sure your agent cannot change your will. Your state's law will tell you exactly what your agent can and cannot do. An attorney in your state can review your power of attorney document and explain what it covers.
Frequently Asked Questions
Can a power of attorney change a will if the document says the agent has unlimited power?
No. Even if the power of attorney says the agent has "all powers" or "unlimited authority," it does not include the power to change a will. Courts interpret power of attorney as explore only to decisions during the principal's lifetime. Wills are testamentary documents that take effect after death, so they are outside the scope of power of attorney no matter how broadly it is written.
What if the person with power of attorney and the executor are the same person?
That person has two separate roles. While the principal is alive, they act as the agent under power of attorney. After the principal dies, they stop acting under power of attorney and become the executor. The rules for an executor are different — they must follow the will's instructions and act in the best interest of the beneficiaries, not the principal.
Can someone with power of attorney write a will for someone who cannot write one themselves?
No. Even if the principal is unable to write or sign a will, the agent cannot do it on their behalf under power of attorney. In rare cases, state law may allow an agent to sign a will if the principal directs them to do so and the will is properly witnessed and notarized, but this is not the same as the agent having power of attorney over the will. The principal must still be mentally capable of understanding what they are doing.
What should I do if I think someone changed my will without permission?
Contact an attorney right away. An attorney can examine the will, compare it to earlier versions, and help you determine whether it was altered. If you find that someone forged or changed your will, you can sign a new will that revokes the old one. You may also want to report the matter to law enforcement if you believe a crime was committed.
Can I give someone power of attorney over my will if I want them to make changes after I die?
No. Power of attorney ends at death and cannot be extended beyond that point. If you want someone to make decisions about your estate after you die, you name them as your executor in your will. The executor has the authority to manage and distribute your estate according to your will's instructions.