The Three Certainties: What Makes a Trust Valid in Ontario

Somebody says, "I want this held in trust for my daughter." Does that create a legal trust? Sometimes yes, sometimes no — the difference comes down to a long-standing doctrine, the three certainties, that courts across Canada, including Ontario, apply to decide whether a trust actually exists.

Understanding these three requirements helps you recognize whether a document — or even an informal family arrangement — actually creates the legal obligation everyone assumes it does.

Certainty of Intention

The first requirement is that the person creating the arrangement genuinely intended to impose a binding trust obligation, not simply express a hope, a wish, or a moral expectation about how someone else should use property. Courts look past the label on a document to its substance: calling something a "trust" doesn't make it one if the real intention was closer to a personal request than a binding legal obligation.

This matters most in informal family arrangements. A parent telling one adult child to "make sure your sister gets a share" doesn't necessarily create an enforceable trust unless the language and circumstances show a genuine intention to bind that person legally.

Certainty of Subject Matter

The second requirement is that the property being placed in trust must be clearly identifiable. "Some of my savings" or "a portion of the house" isn't enough — the trust needs to point to specific, ascertainable property. Where more than one beneficiary is involved, their respective shares or interests also need to be clear, or at least capable of being worked out with certainty.

Certainty of Objects

The third requirement is that the beneficiaries, or the class of beneficiaries, must be identifiable. This doesn't always mean naming every person individually — a class like "my grandchildren living at my death" can satisfy this requirement, as long as it's possible to say with certainty whether any given person does or doesn't fall within it. What it can't be is so vague that no one could ever determine who's actually meant to benefit.

What Happens If a Certainty Is Missing

If one of the three certainties isn't present, the arrangement can fail as an express trust altogether. Depending on the specific facts, the property might remain with, or return to, whoever held it before, the intended gift might simply fail, or a court might find a different legal relationship was created than the one everyone assumed. None of these outcomes are guaranteed in advance — they depend heavily on the exact words used and the surrounding circumstances.

Why This Matters Beyond Formal Trust Documents

The three certainties don't just apply to carefully drafted trust deeds — they can determine whether an informal family arrangement is a trust at all. This connects to a point that comes up often in Ontario estate disputes: adding an adult child's name to a bank account "for convenience" doesn't automatically create a trust or a gift in that child's favour. A rebuttable presumption can apply that the child is simply holding their share as a resulting trust for the parent's estate, unless there's clear evidence the parent actually intended to make an outright gift.

A Practical Checklist Before You Sign or Rely on an Arrangement

• [ ] Does the document or conversation show a clear, binding intention to create a trust, not just a wish?
• [ ] Is the property being placed in trust specifically identified?
• [ ] Are the beneficiaries, or the class of beneficiaries, clearly identifiable?
• [ ] Are the trustee's powers and duties spelled out in writing?
• [ ] Has a lawyer reviewed the arrangement for these elements before you rely on it?

Frequently asked questions