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When Does a Power of Attorney for Property Take Effect in Ontario?

Learn when an attorney under an Ontario power of attorney for property can start acting, and how incapacity, springing clauses and assessments affect timing.

Wills & Estates4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 6, 2026
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Key takeaways
  • Unless the document says otherwise, an attorney under a property power of attorney can start making financial decisions immediately.
  • A document can instead start on a set date, on a specified event, or when the grantor becomes incapable, so the wording of each power of attorney decides the timing.
  • Once the grantor is incapable, the attorney owes fiduciary duties and must keep accounts.

Families often ask the same question when a parent's health declines: can the person named in the power of attorney step in yet, or do they have to wait? The answer is not the same for every document, and acting too early or too late can cause real problems.

This article explains the general rules in Ontario for a power of attorney for property: the default timing, how a document can change it, what happens when incapacity is the trigger, and how capacity is assessed. It does not cover misuse of a power of attorney or challenging an attorney.

The starting point: right away unless the document says otherwise

An attorney under a property power of attorney can start making financial decisions immediately unless the document says otherwise. Many people assume the power only begins once a parent is ill, but that is not the default. The grantor must have been at least 18 to make a power of attorney for property.

This is why the exact wording matters. Two documents that look similar can start at very different times, so read the clause about when the power begins before anyone acts.

What makes a power of attorney continuing and valid

A power of attorney is called continuing if it says the authority can be used while the grantor is incapable of managing property. It is valid if the grantor was capable of giving it when it was signed.

A continuing power of attorney must be signed in the presence of two witnesses, who each sign. The attorney, the attorney's spouse or partner, and anyone under 18 are among those who cannot witness.

Springing powers of attorney: a date or an event

A continuing power of attorney may say it comes into effect on a set date or when a specified contingency happens. This is often called a springing power of attorney. Until that date arrives or the stated event occurs, the attorney would not have authority under that document.

The contingency should be read exactly as written. If you are unsure whether the stated event has happened, a lawyer can review the wording and the facts.

When it starts on incapacity but gives no method

Some documents say they take effect when the grantor becomes incapable but do not explain how that is decided. In that case, the power takes effect when the attorney is notified in the prescribed form by an assessor that the grantor is incapable, or that a certificate of incapacity has been issued.

The legal test is about managing property. A person is incapable of managing property if they cannot understand information relevant to decisions about their property, or cannot appreciate the reasonably foreseeable consequences of a decision or lack of decision. A bad decision, or a decline in memory, does not by itself answer that question.

How the document is wordedWhen the attorney can generally act
No limit on timingImmediately
Set date or specified eventWhen the date arrives or the event happens
Incapacity, with no method to decide itAfter notice from an assessor or a certificate of incapacity

How capacity assessments work

Capacity assessors are trained health professionals, such as doctors, nurses, psychologists, social workers and occupational therapists. An assessment cannot be done if the person refuses, unless a court orders it. Usually the person who asked for the assessment pays the assessor.

Capacity can depend on the decision involved, so a family should not assume a single conversation settles it. An assessment gives a structured, professional view.

Duties once the grantor is incapable, and what to do next

When the grantor is incapable, an attorney under a continuing power of attorney takes on the guardian's duties. These include acting as a fiduciary diligently, honestly and in good faith, keeping accounts, and being liable for damages for breach of duty.

Frequently asked questions

Can an attorney use the power of attorney while the grantor is still capable?

Yes, unless the document says otherwise, an attorney can start making financial decisions immediately. If the document is springing or tied to incapacity, the wording controls instead.

Who decides that someone is incapable?

If the document gives a method, that method applies. If it takes effect on incapacity but gives no way to decide it, it takes effect when the attorney is notified by an assessor that the grantor is incapable, or that a certificate of incapacity has been issued.

What if the person refuses a capacity assessment?

An assessment cannot be done if the person refuses, unless a court orders it. A lawyer can explain the options in your situation.

Who pays for the assessment?

Usually the person who asked for the assessment pays the assessor.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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