Power of Attorney, Guardianship, Capacity & Competency: What’s the Difference?
September 2026
When someone is having difficulty managing their healthcare, finances, or other important decisions, families often start hearing words like power of attorney, guardianship, capacity, and competency.
Sometimes those words are even used interchangeably. But they don’t all mean the same thing.
Understanding the basic differences can help patients and caregivers ask better questions, communicate more clearly with professionals, and figure out what kind of help they may actually need.
Before We Go Further
If terms like advance directive, living will, and healthcare power of attorney are completely new to you, you may want to start with the previous Sunshine Notes article:
Advance Directives, Living Wills & Power of Attorney: Why It’s Better to Plan Before a Crisis
That article walks through the basics of advance care planning, why these conversations are important, and some of the things families can do before an emergency happens.
This article takes the conversation one step further by looking at something that can become especially confusing for families: who actually has the authority to make decisions, and what happens when someone’s ability to make a decision is in question?
What Is Power of Attorney?
A power of attorney, often shortened to POA, is a legal document that gives another person authority to act on someone’s behalf in certain situations.
The person creating the power of attorney determines who they want to appoint and, depending on the document, what authority that person will have.
There are different types of powers of attorney. For example, someone may have authority related to financial matters without having authority to make healthcare decisions.
A healthcare power of attorney may name someone to make healthcare decisions if the individual becomes unable to make or communicate those decisions. The exact authority and when it becomes effective depend on the document and applicable state law.
Does Having POA Mean You Control Everything?
No. This is an important misconception.
Simply hearing that someone “has POA” doesn’t tell you exactly what that person is authorized to do.
You need to know what type of power of attorney it is, what authority the document actually grants, when that authority becomes effective, whether it is still valid, and what applicable state law allows.
Having a power of attorney also does not automatically mean that the person who created it has lost the ability to make their own decisions.
What Is Guardianship?
Guardianship is different from power of attorney.
Generally, guardianship involves a court process in which a court appoints someone to make certain decisions for another person after the legal requirements for guardianship have been met.
The guardian’s authority comes from the court. Depending on the jurisdiction and circumstances, that authority may be limited to particular areas or may be broader.
Because guardianship can significantly affect a person’s legal rights and because laws vary by state, questions about whether guardianship is appropriate should be discussed with a qualified attorney.
POA and Guardianship Are Not the Same Thing
One of the easiest ways to understand the difference is to think about where the authority comes from.
With a power of attorney, a person generally chooses another person and grants authority through a legal document.
With guardianship, authority is generally granted through a court process.
That distinction matters. It also means that being someone’s spouse, adult child, caregiver, or emergency contact does not necessarily give you the same legal authority as an appointed healthcare agent or court-appointed guardian.
What Does Capacity Mean?
This is where things can become more complicated.
In healthcare, capacity generally refers to a person’s ability to understand relevant information and make an informed decision.
Capacity isn’t necessarily all or nothing. A person may be able to make one type of decision while having difficulty with another. Capacity can also change.
Someone’s ability to make a decision may be affected by the complexity of the decision, illness, medication, delirium, cognitive impairment, or other circumstances.
This is why statements like “She has dementia, so she can’t make decisions anymore” can oversimplify a much more complicated issue. A diagnosis alone doesn’t answer every question about someone’s ability to participate in a particular decision.
What About Competency?
People often hear that capacity is a medical determination while competency is a legal determination.
That can be a helpful starting point for understanding the concepts, but the terminology isn’t that simple everywhere.
Historically, “competency” or “incompetency” was more commonly associated with legal determinations, while healthcare professionals assessed decision-making capacity.
Today, terminology varies by jurisdiction, and many laws use terms such as capacity, incapacity, legal capacity, or clinical capacity instead.
The important takeaway for patients and caregivers isn’t memorizing the terminology. It’s knowing who is making the determination, what specific decision is being considered, and what that determination actually means.
Needing Help Is Not the Same as Being Unable to Decide
This may be one of the most important distinctions for families to understand.
Someone may need help remembering appointments, organizing medications, understanding insurance, reading complicated paperwork, communicating with multiple providers, keeping track of bills, comparing options, or asking questions.
None of those things, by themselves, automatically mean that the person cannot participate in decisions about their own life or healthcare.
Support and decision-making authority are not the same thing.
Whenever possible and appropriate, patients should remain involved in conversations and decisions affecting them.
Questions Families Can Ask
If you’re unsure who has authority to make a particular decision, instead of assuming, start asking questions.
You might ask:
• Is there a healthcare power of attorney or advance directive?
• Who is named in the document?
• What authority does the document provide?
• Is there a court-appointed guardian?
• What does the guardianship order authorize?
• Has there been an assessment related to this specific decision?
• Can the patient still participate in the conversation?
• Do we need legal guidance about what this document or court order allows?
Those questions can help clarify the situation without jumping immediately to conclusions about what someone can or cannot do.
Why These Distinctions Matter
Words matter, especially when we’re talking about someone’s right to make decisions about their own healthcare, finances, living situation, or life.
Saying someone “can’t make decisions” is a significant statement.
So is assuming that a family member automatically has authority because they’re the spouse, child, caregiver, or person who usually handles everything.
Understanding the difference between supporting someone, acting under a power of attorney, and serving as a court-appointed guardian can help families know when they need additional guidance.
Keeping Important Documents Organized
If your family has powers of attorney, advance directives, guardianship documents, or other important records, knowing where those documents are is important too.
The Sunshine Advocacy Navigation Binder provides one place to organize healthcare and caregiver information, including legal and advance planning documents.
Explore the Sunshine Advocacy Navigation Binder:
https://www.sunshinepatientadvocacy.com/services-store/p/sunshine-advocacy-navigation-binder
The binder is an organizational tool only. It does not create legal authority, replace legal documents, or provide legal advice.
When You’re Not Sure, Ask
Families don’t have to become experts in healthcare law.
But understanding a few basic distinctions can help you recognize when a situation requires more information and when it’s time to involve the appropriate professional.
A patient advocate can help with education, organization, communication, and healthcare navigation.
A healthcare professional can address clinical questions and assessments within their scope.
An attorney can provide advice about legal rights, powers of attorney, guardianship, and the laws that apply to your specific situation.
Knowing which question belongs to which professional is an important part of navigating complicated care.
Important Disclaimer
This article is provided for general educational purposes only and is not legal or medical advice. Laws, terminology, standards for decision-making capacity, guardianship requirements, and powers of attorney vary by state and individual circumstances. Sunshine Patient Advocacy and Support Services does not provide legal services, interpret legal documents, determine legal competency or capacity, or provide medical diagnoses or advice. Consult an appropriately licensed attorney or healthcare professional for guidance about your individual circumstances.
Sources: National Institute on Aging, Advance Care Planning: Advance Directives for Health Care; American Bar Association Commission on Law and Aging; Merck Manual Professional Edition, Capacity (Competence) and Incapacity.