Leaving Someone Out of Your Ontario Will: Disinheritance and Its Limits

Writing a will is one of the most personal legal acts you can take. You get to decide who receives your estate — and equally important, who does not. If you are thinking about disinheritance in your Ontario will, you have the right to do it. But that right comes with real legal limits, and ignoring them can unravel your wishes after you are gone.

This article explains when Ontario law lets you cut someone out, when it does not, and what practical steps can make your intentions hold up.

The Starting Point: Testamentary Freedom

Ontario's general rule is that adults can leave their property to whomever they choose. This principle is called testamentary freedom. If you want to leave your entire estate to a charity and nothing to your sibling, the law permits that. If you want to divide your assets unequally among your children, that is your prerogative too.

This freedom is meaningful. Courts in Ontario will not rewrite a will simply because the result feels unfair or because family members are disappointed. The fact that someone expected an inheritance does not give them a legal right to one.

That said, testamentary freedom is not unlimited. Two major legal regimes can override what your will says.

The Key Limit: Dependant's Support Claims

Who Qualifies as a Dependant?

Part V of Ontario's Succession Law Reform Act (SLRA) allows certain people to apply to court for support from your estate if your will does not make "adequate provision" for their proper support. These people are called dependants.

The categories of dependants under the SLRA are broader than many people expect. They include:

• A spouse (married or a qualifying common-law partner)
• A child — this includes adult children, not only minors
• A parent
• A sibling — in certain circumstances

The key is not simply that the person falls into one of these categories. They must also have been actually dependent on you for support, or be someone to whom you owed a duty of support under the legislation. An adult child who is financially self-sufficient and has no disabilities, for example, is in a very different position from an adult child with a serious disability who relied on your financial help.

What Does "Adequate Provision" Mean?

If a dependant applies to court, a judge considers all the circumstances to decide whether your will makes adequate provision for them. There is no fixed dollar threshold. Relevant factors can include:

• The dependant's financial need and ability to support themselves
• The size of your estate
• The nature of your relationship with the dependant
• Whether the dependant contributed to your estate or cared for you
• Your own financial obligations to others named in the will
• Any support arrangements you made during your lifetime (trusts, gifts, insurance)

Courts look at the whole picture. A will that leaves nothing to a spouse who never worked outside the home and has significant health needs will face serious scrutiny. A will that leaves nothing to an adult child with a good career and no disabilities faces far less risk.

If the court finds that adequate provision was not made, it can order that support be paid from the estate, altering the distribution you planned.

The Spouse's Election Under the Family Law Act

A surviving married spouse faces a separate and powerful option. Under Ontario's Family Law Act, a spouse can elect to receive their equalization entitlement — essentially their share of the net family property accumulated during the marriage — instead of whatever the will provides.

This election can be significant. If the will leaves the spouse a small bequest but the couple accumulated substantial property together over a long marriage, the equalization payment could be worth considerably more. The spouse simply chooses whichever outcome is more favourable.

Common-law spouses do not have this election under the Family Law Act, though they may still bring a dependant's support claim under the SLRA if they qualify.

Adult Children with No Financial Need

Many parents ask: can I leave one child more than another, or leave an adult child nothing at all? Generally, yes — if that adult child is financially independent and does not have a disability or special need that created dependency on you.

Cutting someone out of will arrangements for adult children is legally much cleaner when there is no financial dependency involved. The more difficult cases involve adult children with serious illnesses, disabilities, or mental health conditions who relied on the parent for support.

Documenting Your Intention

If you are deliberately excluding someone — particularly a family member who might challenge the will — documentation matters. Courts can consider your reasons when assessing a dependant's support claim, even if a "letter of wishes" is not legally binding.

Practical steps include:

• A signed letter of wishes explaining your reasons, prepared alongside the will
• Specific language in the will acknowledging the person and your choice not to benefit them (your lawyer can draft this carefully so it does not create unintended problems)
• Keeping records of any support arrangements you made during your lifetime that might satisfy the duty of support
• Review the will regularly — circumstances change, and so does the risk profile of a challenge

An explicit exclusion with documented reasoning is harder to attack than a will that simply omits someone with no explanation.

What a Successful Claim Can Result In

If a dependant's support claim succeeds, the court has broad remedies. It can order a lump-sum payment, periodic payments, a trust to be established, or a transfer of specific property from the estate to the dependant. The estate pays legal costs of the litigation, which reduces what is available for your intended beneficiaries.

This is why prevention — getting the will right from the start — is far less costly than litigation after the fact.

Frequently asked questions