What happens to legal decisions when someone develops dementia

When a senior develops dementia, they gradually lose the ability to make decisions about money, healthcare, and property. The law does not automatically transfer these powers to a family member — you have to establish legal authority first, and the route depends on how much decision-making power the person with dementia still has and whether they are willing to sign documents.

If the person with dementia can still understand what they are signing, they can create documents that give you power now, while they are still legally competent. If they cannot, you will need to go to court to become their legal guardian or conservator. The difference matters: documents signed while someone is still able are faster and cheaper than court proceedings, but they only work if the person agrees and understands what they are doing.

Starting this process early — as soon as you notice memory problems but before diagnosis — makes everything simpler. A doctor's note that the person understands what they are signing carries weight. Once someone is diagnosed with dementia, banks and courts become more skeptical of any new documents, even if the person seems fine on a particular day.

Key Takeaways

  • A power of attorney document signed while the person with dementia still understands it avoids court and costs far less than guardianship, but must be done before they lose decision-making ability.
  • If the person cannot or will not sign documents, you must go to court to become their guardian or conservator, a process that takes weeks to months and requires a lawyer.
  • A healthcare proxy or medical power of attorney lets you make medical decisions; a financial power of attorney covers money and property.
  • You should tell the person's bank, investment firm, and mortgage lender what legal authority you have, because they will not act on your word alone.
  • If the person owns property or has a substantial estate, you may need a conservatorship (court-supervised) rather than just a power of attorney.

Power of attorney: the fastest route if the person can still sign

A power of attorney is a document the person with dementia signs, giving you the legal right to act on their behalf. There are two types: a healthcare power of attorney (also called a healthcare proxy) lets you make medical decisions; a financial power of attorney lets you handle money, pay bills, and manage property.

The person signing must understand what they are doing — they must know they are giving you power and what that power covers. A notary public witnesses the signature, and some states require a doctor to confirm the person understands. You can create both documents at the same time, and they can take effect when ready or only if the person becomes unable to decide for themselves (called a "springing" power of attorney).

The cost is usually $200 to $500 per document if you use a lawyer, or $50 to $100 if you use a legal document service or template. The person does not need to be diagnosed with dementia yet — in fact, it is easier if they are not. If they are already diagnosed, ask their doctor whether they think the person still understands financial or medical decisions. That conversation, and a note from the doctor, protects the document later.

Once the document is signed and notarized, you can use it when ready. You do not file it anywhere — you straightforward show it to the bank, doctor, or whoever needs to know you have authority. Some institutions will ask for a certified copy; your lawyer or notary can provide one for a small fee.

Guardianship and conservatorship: when court involvement is necessary

If the person with dementia will not sign a power of attorney, or if they have already lost the ability to understand what signing means, you must go to court. The court process is called guardianship (in most states) or conservatorship (in some states like California). Guardianship covers both personal and healthcare decisions; conservatorship usually means financial decisions only, though the terms overlap by state.

To start the process, you file a petition in the probate or family court in the county where the person lives. You will need a lawyer — most states require it, and the forms are complex. The court will order a medical evaluation to confirm the person cannot make decisions. You may have to appear in court, and the person with dementia has the right to contest the guardianship, though they rarely do.

The timeline is typically 4 to 12 weeks from filing to court order, depending on the court's schedule and whether anyone objects. The cost ranges from $1,500 to $5,000 in lawyer fees, plus court filing fees of $200 to $500. Once you are appointed, you must file annual reports with the court showing how you spent the person's money and what decisions you made — this oversight protects them but also creates paperwork every year.

If the person has significant assets or property, you may need a conservatorship rather than just guardianship. A conservator has court-supervised control of money and property and must account for every dollar. This is more restrictive and expensive than a power of attorney, but it is the only option if the person never signed documents and cannot sign them now.

Healthcare decisions: medical power of attorney and HIPAA authorization

A healthcare power of attorney (also called a healthcare proxy or medical power of attorney) gives you the right to make medical decisions when the person with dementia cannot. This includes decisions about surgery, medication, feeding tubes, and end-of-life care. It is separate from a financial power of attorney and covers only medical matters.

The document should name you as the primary agent and name a backup agent in case you are unavailable. You can limit the power — for example, you can say the agent can make decisions about daily care but not about life support — or you can give broad authority. The person signs it in front of a notary, and it takes effect when ready or when they lose decision-making ability, depending on how it is written.

You also need a HIPAA authorization, a separate form that lets doctors share medical information with you. Without it, doctors can refuse to tell you test results, diagnoses, or treatment plans, even if you have a healthcare power of attorney. The form is straightforward and free; ask the doctor's office or hospital for their version, or use a generic one from your state's medical board website.

Give copies of both documents to the person's primary care doctor, any specialists they see regularly, and the hospital or care facility where they receive treatment. Keep a copy for yourself and one in a safe place at home. Update the list if the person changes doctors.

Financial decisions: managing money, bills, and property

A financial power of attorney lets you pay bills, access bank accounts, sell property, and manage investments on the person's behalf. You can use it to pay for their care, medical bills, property taxes, and living expenses. Some powers of attorney limit what you can do — for example, you might be able to pay bills but not sell the house — so be clear about what authority you need.

Once you have the document, contact the person's bank, investment firm, mortgage lender, and insurance company. Tell them you have a power of attorney and ask what they need from you. Most will want to see the original document and may ask you to fill out their own power of attorney form. Some banks will not accept an outside power of attorney and will only recognize their own form, so ask before you assume your document will work.

Keep detailed records of every transaction you make on the person's behalf — every check you write, every bill you pay, every transfer of money. If you are ever questioned, these records prove you acted in their interest. If the person has a conservatorship, you must file an annual accounting with the court listing all income and expenses.

If the person owns real estate, you may need to record the power of attorney with the county recorder's office before you can sell or refinance the property. Ask a real estate lawyer or the county recorder whether this is required in your state.

What to do if the person refuses to sign documents

Some people with early dementia refuse to sign a power of attorney because they do not believe anything is wrong, or because they distrust family members, or straightforward because they do not want to think about it. If persuasion does not work, your only option is to go to court for guardianship.

Before you file, talk to an elder law attorney about whether guardianship is truly necessary. If the person's finances are straightforward, if they have no property, and if they are in a care facility where staff handle daily decisions, you may not need court authority for everything. An attorney can tell you what decisions actually require legal power and what you can handle informally.

If you do file for guardianship, be prepared for the person to contest it. They have the right to a lawyer and to appear in court. The judge will consider whether they truly cannot make decisions or whether they are just stubborn. If the judge finds they still have some decision-making ability, you may be appointed as a limited guardian with power over only certain decisions.

Protecting assets and planning for long-term care costs

As the person's legal representative, you have a duty to protect their money and property. This means managing their assets carefully so there is enough to pay for care, medical bills, and living expenses for as long as they live.

If long-term care is likely — nursing home, assisted living, or in-home care — you should understand how it will be paid for. Medicare covers some skilled nursing care but not custodial care or assisted living. Medicaid covers long-term care for people with low income and assets, but the rules are complex and vary by state. An elder law attorney can explain whether the person will need to spend down assets to become may be able to access for Medicaid, or whether they have enough money to pay privately.

Do not transfer the person's money or property to yourself or other family members to hide it from Medicaid. This is illegal and can result in a penalty period where Medicaid will not pay for care. If you need to protect assets, an attorney can show you legal ways to do it.

Keep the person's money separate from your own. Do not deposit their checks into your personal account or use their money to pay your own bills. If you are the conservator, the court will ask you to account for every dollar. Even if you are not, mixing money creates confusion and can look like theft if anyone questions it later.

When to involve an elder law attorney

You should consult an elder law attorney if any of these explore: the person has significant assets or property; you expect family conflict over decisions; the person refuses to sign documents; the person's care will be expensive and you need to understand Medicaid rules; or you are unsure whether you need guardianship or a power of attorney.

An initial consultation usually costs $200 to $400 and takes an hour. The attorney will review the person's situation and tell you what documents or court action you need. If you cannot afford a lawyer, contact your local bar association or legal aid office — many offer free or low-cost consultations for seniors.

If you do hire an attorney, ask them to explain the difference between what you can do with a power of attorney and what requires guardianship. Ask what documents you need to sign and what the timeline will be. Ask what it will cost and whether there are ways to reduce the cost. A good attorney will answer these questions clearly and will not push you toward expensive options you do not need.

Frequently Asked Questions

Can I use a power of attorney form from the internet?

Yes, if your state recognizes it and the person understands what they are signing. Many states have standard forms on their court websites or bar association websites. The form must be notarized and, in some states, witnessed by two people. If the person is already diagnosed with dementia, a lawyer's involvement makes the document harder to challenge later, even if it costs more upfront.

What if the person with dementia signed a will years ago — do I need to change it?

Not necessarily. A will made when the person was healthy is valid even after they develop dementia. You only need to change it if their wishes have changed or if the will names someone as executor who is no longer able to serve. If you think the will is unfair or was made under pressure, talk to an attorney before the person dies — changing it after they lose decision-making ability is much harder.

Do I have to tell the person with dementia what decisions I am making on their behalf?

You should try to, even if they do not understand or remember. Explain in straightforward terms what you are doing and why. This respects their dignity and can reduce anxiety. If they become upset or agitated, you can stop explaining and just proceed with the decision — your job is to act in their best interest, not to get their approval every time.

What happens to the power of attorney if the person dies?

The power of attorney ends when the person dies. You no longer have authority to act on their behalf. If they left a will, the person named as executor takes over and handles the estate. If there is no will, the state's intestacy laws determine who inherits, and you may need to go to court to be appointed administrator of the estate.

Can I be sued for decisions I make as guardian or agent?

Unlikely, if you act in good faith and in the person's best interest. You have legal protection as long as you are not stealing from them or making reckless decisions. If you are a court-appointed guardian, the court's oversight actually protects you — the annual reports show you are being monitored. If someone sues you anyway, your homeowner's or umbrella insurance may cover the legal cost.