Key Takeaways
A power of attorney protects you while you are alive, and a will only speaks after your death. Neither document can do the other’s job, so most Ontario adults need a will, a continuing power of attorney for property, and a power of attorney for personal care. This guide explains what each document covers, when each takes effect, and the costly gaps that open when you have one without the other.
A power of attorney is a legal document that gives a person you trust the authority to make decisions on your behalf while you are alive. A will is a legal document that directs who receives your property after you die and names the estate trustee who carries out your instructions. The two documents never overlap in time. Your powers of attorney end the moment you die, and your will has no legal effect until that same moment.
Ontario law also treats them very differently. Powers of attorney fall under the Substitute Decisions Act, 1992, while wills fall under the Succession Law Reform Act. Different rules decide who can make each document, how each must be signed, and what happens if you never make one at all. This guide walks through those differences so you can see exactly which documents your situation calls for.
What Is the Difference Between a Power of Attorney and a Will?
The difference comes down to timing. A power of attorney authorizes someone to act for you during your lifetime, most importantly if illness or injury leaves you mentally incapable. A will controls what happens to your property after your death and appoints the person who administers your estate.
The person who acts under each document is different too. Under a power of attorney, your representative is called your attorney, and despite the name, your attorney does not need to be a lawyer. Under a will, the person in charge is your estate trustee, the role many people still call an executor. You can name the same trusted person to both roles, but their authority comes from two separate documents governed by two separate statutes.
The short video below sums up the difference.
| Aspect | Power of Attorney | Will |
|---|---|---|
| When it applies | While you are alive | After your death |
| What it covers | Financial and property decisions, or personal and health care decisions | Who inherits your estate, who administers it, and your wishes for minor children |
| Who acts for you | Your attorney, who does not need to be a lawyer | Your estate trustee, often called an executor |
| Governing law | Substitute Decisions Act, 1992 | Succession Law Reform Act |
| Minimum age | 18 for property, 16 for personal care | 18, with narrow exceptions for married persons and Canadian Armed Forces members |
| When it ends | At your death, or earlier if revoked | Speaks at death and can be changed any time while you are capable |
| If you never make one | Your family may need a court application for guardianship | Ontario intestacy rules decide who inherits |
The practical takeaway is simple. If you only have a will, nobody has clear authority to manage your affairs while you are alive but incapable. If you only have powers of attorney, Ontario decides who inherits your estate when you die.
What Is a Power of Attorney in Ontario?
A power of attorney is a document in which you, called the grantor, appoint one or more people to make decisions on your behalf. The Substitute Decisions Act, 1992 creates two distinct types, and they cover very different parts of your life. Our overview of power of attorney types and costs in Ontario covers each in more depth.
Continuing Power of Attorney for Property
A continuing power of attorney for property lets your attorney manage your financial affairs, including banking, bill payments, investments, tax filings, and buying or selling real estate. The word continuing matters because it means the document keeps working if you become mentally incapable, which is exactly when you need it most.
You must be at least 18 years old and mentally capable when you sign. Unless the document says otherwise, it takes effect as soon as you and your witnesses sign, not only upon incapacity. Many clients add wording that delays the attorney’s authority until incapacity is confirmed, and we review the advantages and drawbacks of each approach before you sign. One limit is absolute either way. Your attorney can do almost anything you could do with your property, except make a will on your behalf.
Power of Attorney for Personal Care
A power of attorney for personal care covers decisions about your health care, medical treatment, housing, nutrition, clothing, hygiene, and safety. You can make one at age 16. Unlike the property document, it operates only when you become mentally incapable of making a specific personal care decision, and for medical treatment a health practitioner assesses your capacity one decision at a time.
You can also record wishes about future care inside the document, such as instructions about life support. Ontario law does not use the term living will, but this document plays that role. Your attorney must follow the most recent wishes you expressed while capable.
What Is a Will in Ontario?
A will is a written document that takes effect at your death. It names your estate trustee, sets out who receives your property, records your wishes about guardianship of minor children, and can create trusts for beneficiaries who should not inherit everything at once. We explain the building blocks in our guide to how a will works in Ontario.
Ontario recognizes two formats. A formal will must be signed by you at its end in front of two witnesses who are present at the same time and who also sign. A holographic will is written entirely in your own handwriting and signed by you, with no witnesses required. Since January 1, 2022 the Superior Court of Justice can also validate a document that misses a formality if it clearly records your final testamentary intentions, but that court application is slow and uncertain compared with signing a proper will in the first place.
After your death, your estate trustee usually applies for a Certificate of Appointment of Estate Trustee, the process most people call probate. Ontario charges estate administration tax on that application. The first $50,000 of estate value is exempt, and the estate pays $15 for every $1,000 above that amount, which works out to $14,250 on a $1,000,000 estate. Those figures are current as of July 2026, and you should confirm them on the Ontario government’s estate administration tax page before relying on them.
When Does Each Document Take Effect and When Does It End?
Think of the two documents as a relay. Your powers of attorney can carry you from the day you sign them until the day you die. Your will picks up from the moment of death and carries your estate through to final distribution.
A continuing power of attorney for property usually takes effect when signed, unless you build in a delayed trigger. A power of attorney for personal care activates only when you cannot make a specific personal care decision. Both end automatically at your death. They also end if you revoke them while capable, if your only attorney dies or resigns with no substitute named, or if a court appoints a guardian for you.
A will works in reverse. It has no legal force during your lifetime, you can change or revoke it any time while you are mentally capable, and it speaks from the moment of death. Your attorney’s authority stops at that same moment, even when the same person is also your estate trustee. From then on that person acts under the will, and their duties run to your beneficiaries and creditors rather than to you.
Can a Power of Attorney Override or Change a Will?
No. The Substitute Decisions Act allows your attorney for property to do anything you could do with your property except make a will. That means your attorney cannot write a will for you, cannot rewrite the one you have, and cannot revoke it.
The two documents still interact in one way that surprises many families. Suppose your will leaves your house to your daughter, and years later your attorney sells that house to pay for your long term care. Ontario law protects your daughter in that situation. When an attorney disposes of property that your will gives to a specific person while you are incapable, the gift does not simply fail. That person is generally entitled to the equivalent value from the rest of your estate, unless your will says otherwise. The rule preserves your intentions, but it can shrink what everyone else receives, which is one reason we review your will and your powers of attorney together rather than in isolation.
What Happens if You Have Only One Document?
A Will but No Powers of Attorney
Your family cannot automatically step in if you lose capacity. Ontario has no rule that hands your spouse or children authority over your finances, so someone would need to apply to court to become your guardian of property. That application takes months, costs far more than preparing powers of attorney would have, and puts a judge rather than you in charge of choosing your decision maker. The Office of the Public Guardian and Trustee, a government office, becomes involved only as a last resort. Health care works slightly differently because Ontario’s consent rules rank the family members who may consent to medical treatment, but that ranked list does not cover every personal care decision, and the person at the top of it may not be the person you would choose.
Powers of Attorney but No Will
Your powers of attorney die with you. From that moment nobody has authority over your estate until the court appoints an estate trustee, and Ontario’s intestacy rules decide who inherits. A married spouse currently receives the first $350,000 of the estate, called the preferential share, plus a portion of anything above it when you leave children. A common law partner receives nothing automatically under those rules, no matter how long you lived together. Naming your partner in a valid will is the only way to make sure they inherit. We describe the full sequence in what happens if you die without a will in Ontario.
Do You Need Both a Power of Attorney and a Will?
For most Ontario adults the answer is yes, and in practice the complete set is three documents rather than two. A will, a continuing power of attorney for property, and a power of attorney for personal care each cover a stage or a category the other two cannot reach.
A few common situations show why. If you live common law, your partner has no automatic right to manage your finances during incapacity and no automatic inheritance on death, so both documents carry real weight. If you have minor children, your will records your guardianship wishes and can hold their inheritance in trust until an age you choose. If you own a private corporation, your lawyer may recommend signing two wills so that shares which do not require probate pass outside the estate administration tax calculation, a structure that depends on your corporate holdings and needs careful drafting. If you are helping an aging parent, confirming their powers of attorney exist while they are still capable is often more urgent than updating their will.
How Do You Make Valid Powers of Attorney and a Will in Ontario?
Each power of attorney needs two witnesses who watch you sign and who sign themselves. Your spouse or partner, your child, the attorney you are appointing, that attorney’s spouse or partner, and anyone under 18 cannot witness. The Ontario government publishes a free power of attorney kit, and no registration is required, though banks sometimes ask for a notarized copy before they accept one.
A formal will needs two witnesses who are present together when you sign at the end of the document. A beneficiary or a beneficiary’s spouse should never witness, because a gift to a witness is generally void. Ontario also permits virtual witnessing for wills and powers of attorney when at least one witness is a lawyer or paralegal licensed by the Law Society of Ontario, and signatures must still be made in wet ink.
Timing rules changed recently and catch people out. If you married on or after January 1, 2022, the marriage does not revoke your existing will. If you married before that date while holding an older will, that will may have been revoked under the previous rule, and it is worth confirming where you stand. Separation and divorce generally cause your will to be read as if your former spouse died before you, which cancels gifts to them and their appointment as estate trustee unless your will says otherwise.
Frequently Asked Questions About Powers of Attorney and Wills
Does a power of attorney override a will in Ontario?
No. A power of attorney operates only while you are alive and ends at your death, while a will takes effect only at death. Your attorney cannot make, change, or revoke your will, and decisions your attorney makes during your lifetime cannot rewrite who inherits, although selling an asset your will specifically gifts can change what value flows to which beneficiary. When the two documents pull in different directions, the fix is coordinated drafting rather than hoping one overrides the other.
Can the same person be my attorney for property and my estate trustee?
Yes, and many people choose the same trusted person for both roles because that person already knows the assets. The roles remain legally separate. Your attorney acts under the power of attorney while you are alive, and after your death the same person takes authority as estate trustee under the will. If you name different people, choose two who can cooperate, because the estate trustee will eventually ask the former attorney to account for what they did with your property.
Does my power of attorney continue after I die?
No. Every power of attorney ends automatically at death, whether it covers property or personal care. From that point only an estate trustee has authority, either under the will or through a court appointment when there is no will. Anyone who keeps using a power of attorney after the death, even with good intentions, acts without authority and can be personally responsible to the estate.
Do I need a lawyer to prepare a power of attorney or a will?
Ontario law does not require one, and the province publishes a free power of attorney kit. The legal requirements look simple, but the failure points are real, including witness eligibility, unclear triggers for incapacity, bank forms that revoke earlier documents, and wills that ignore how separation or corporate assets affect the plan. A lawyer prepared package costs a known amount now, while fixing a defective document later usually involves a court application. If your affairs include real estate, a business, a blended family, or a common law relationship, legal advice earns its cost quickly.
What happens to my will if I marry, separate, or divorce?
For marriages on or after January 1, 2022, getting married does not revoke your will, though you should still review it because an older will rarely reflects a new family. If you married before 2022 while holding a will, the old revocation rule may have cancelled that will. Separation and divorce generally cause the will to be read as if your former spouse died before you, so gifts to them and their appointment as estate trustee fall away unless the will says otherwise. Each of these events is a reason to review both your will and your powers of attorney.
How much does probate cost when there is a will?
Ontario charges estate administration tax when the court issues a Certificate of Appointment of Estate Trustee. The first $50,000 of estate value is exempt, and the tax is $15 for every $1,000 or part of it above that amount, so a $500,000 estate pays $6,750 and a $1,000,000 estate pays $14,250. The estate pays this tax rather than the estate trustee personally, and an Estate Information Return must be filed with the Ministry of Finance within 180 days after the certificate issues. These figures are current as of July 2026 and appear on the Ontario government’s estate administration tax page.
The information provided above is of a general nature and should not be considered legal advice. Every transaction or circumstance is unique, and obtaining specific legal advice is necessary to address your particular requirements. Therefore, if you have any legal questions, it is recommended that you consult with a lawyer.
