- A will challenge argues the will itself isn't legally valid.
- You can't "will challenge" your way out of feeling underpaid If the will was properly made — the testator had capacity, understood and approved its contents, and wasn't unduly influenced…
When someone feels shortchanged by a will, two very different legal routes sometimes get mentioned in the same breath: challenging the will itself, and bringing a dependant support claim. They can overlap in the same family dispute, but they ask the court completely different questions — and mixing them up can mean pursuing the wrong strategy, or missing a deadline for the one that actually fits.
This article compares them directly so you know which conversation you're actually having.
The Core Difference in One Sentence
A will challenge argues the will itself isn't legally valid. A dependant support claim accepts that the will is valid, but argues it didn't provide adequately for someone the deceased was legally obligated to support.
Side-by-Side Comparison
| Will Challenge | Dependant Support Claim | |
|---|---|---|
| What it argues | The will, or part of it, shouldn't be treated as legally valid | The valid will (or the intestacy result) didn't provide adequate support for an eligible dependant |
| Legal basis | Grounds such as lack of testamentary capacity, lack of knowledge and approval, undue influence, fraud, or improper execution | Part V of the Succession Law Reform Act |
| Who can bring it | Someone with a genuine interest in the outcome, typically an intended beneficiary under an earlier will, or someone who'd inherit more under intestacy if the will fails | An eligible dependant, such as a spouse — including some common-law partners who meet specific relationship criteria — and others who fall within the statutory definition |
| What happens if it succeeds | The will, or the challenged part, is set aside; an earlier valid will, or the intestacy rules, applies instead | The court can adjust what the dependant receives from the estate, without necessarily invalidating anything else in the will |
| Effect on the rest of the will | Can affect the entire distribution scheme if the whole will fails | Generally targeted — the court redirects support to the dependant without rewriting every other gift |
| Limitation period | Governed by general limitation principles rather than one fixed estate-specific deadline; timing is fact-specific, so get advice early | Generally six months from the grant of probate or administration, though a court has some discretion to allow a later claim against any part of the estate not yet distributed (as of mid-2026 — verify current timing with a lawyer) |
| Common misconception | That simply disagreeing with the distribution is enough — it isn't | That only a legal spouse can bring a claim — a qualifying common-law partner and certain others can too |
Why the Distinction Matters in Practice
You can't "will challenge" your way out of feeling underpaid
If the will was properly made — the testator had capacity, understood and approved its contents, and wasn't unduly influenced or defrauded — a court won't set it aside just because a beneficiary thinks the distribution is unfair. That dissatisfaction, on its own, isn't a recognized ground for a will challenge.
A dependant support claim doesn't require anything to be "wrong" with the will
A dependant support claim can succeed even against a will that was made perfectly properly. The question isn't whether the will is valid — it's whether the deceased met their legal obligation to provide for an eligible dependant, regardless of what they chose to put in writing.
The two can run alongside each other
In some family disputes, one person challenges the will's validity while another, or the same person in the alternative, brings a dependant support claim if the will is found to be valid after all. A lawyer can help identify which claim, or which combination, actually fits the facts, rather than pursuing the wrong one and losing time.
Who Typically Uses Each Route
- Will challenges tend to come from people who believe undue influence, a cognitive decline, or a suspicious late change explains why a will looks so different from what the deceased always said they wanted.
- Dependant support claims tend to come from spouses, qualifying common-law partners, and others who depended on the deceased financially and were left out entirely, or left with less than what the law considers adequate support, regardless of whether the will was otherwise made properly.
What Neither Route Can Do
Neither a will challenge nor a dependant support claim exists to correct a distribution that's simply perceived as unfair among beneficiaries who were all adequately provided for. Ontario law generally respects a testator's freedom to divide their estate as they choose, within these specific, limited legal guardrails.
Frequently asked questions
Can I bring both a will challenge and a dependant support claim at the same time?
Yes, in some circumstances — they're often pleaded as alternatives, so the court has a path forward whether or not the will challenge succeeds. A lawyer can advise on whether that makes sense for your specific facts.
Does a common-law partner have the same rights as a married spouse in either claim?
No. A common-law partner has no automatic right to inherit if there's no will, and no automatic standing to bring a will challenge based on that fact alone, but may still qualify to bring a dependant support claim if they meet the legal definition of a spouse for that specific purpose, which depends on the length and nature of the relationship.
What happens if I miss the dependant support claim deadline?
The general rule is that a claim must be brought within a set window from the grant of probate or administration, but the court has some discretion to allow a later claim against any part of the estate that hasn't yet been distributed. This is not a guarantee, and getting legal advice as early as possible is the safer course.
Is it more expensive to bring a dependant support claim than a will challenge?
Cost depends heavily on the complexity of the specific case, not which type of claim it is. Both can range from a straightforward, quickly resolved matter to a lengthy, evidence-heavy dispute.
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