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Are Business Interests and Shares Counted for Estate Tax in Ontario?

See how Ontario's Estate Administration Tax treats business interests, investments and secondary wills, and how assets are valued at the date of death.

Wills & Estates5 min readTSLBy the Treadstone Law Team · OntarioUpdated November 13, 2026
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Key takeaways
  • Investments and business interests are included in the estate's value.
  • Assets are valued at fair market value at the time of death, and values must be supported by documents or an appraiser.
  • If the court issues a certificate limited to a specific will, only assets in that will count.

Inheriting a private company or an investment portfolio raises two questions: does it count toward Ontario's probate tax, and how is it valued? The answers matter because the value you report on the application drives the Estate Administration Tax the estate pays.

This article covers the general rules in plain language. It explains what is counted, what is left out, how assets are valued, and what the estate representative has to do afterwards. Valuing a business can be complex, so professional help is often sensible.

What counts toward the estate's value

The estate's value includes investments, business interests and other property wherever situated. Property held in another person's name is also included. So shares in a private company, or an interest in a business, are generally part of the total.

The tax applies only if probate is applied for and the certificate issues. For applications on or after January 1, 2020, no tax is payable on an estate worth $50,000 or less, and above that the tax is $15 for every $1,000 (or part thereof) of value over $50,000. The estate's value is rounded up to the nearest thousand dollars to calculate the tax.

What is left out

Some property is not counted, because the deceased no longer owned it at death or because the rules exclude it. Each of these has its own exception, so the details of how the asset was held matter.

Tenants in common are treated differently from joint owners. When a tenant in common dies, their share does not pass automatically to the other owners, and it counts toward the estate's value if probate is sought. How your business interests or shares were held can change the result, so it is worth confirming with a lawyer.

How assets are valued

Assets are valued at their fair market value at the time of death. Real property is valued at its appraised value at the date of death, even if it sells for more or less shortly after the death.

Estate representatives must be able to back up the asset values with supporting documents, such as statements or an appraiser's opinion of value. For complex assets, a professional appraiser with expertise in that area may help recommend a value.

How a particular private company should be valued depends on its facts, so confirm with an accountant or appraiser.

Secondary wills and limited certificates

If the court issues a certificate limited to the assets in a specific will, only the assets in that will count toward the estate's value. Whether this approach suits your situation depends on the facts and the wills, so ask a lawyer.

Other certificates have their own rules. For resealing, ancillary and foreign nominee certificates, only assets located in Ontario are used to calculate the tax.

Debts, the return and later changes

Only encumbrances on real property can be deducted. A mortgage, collateral mortgage or lien registered against real property that is part of the estate can be deducted from that property's value. Funeral expenses, lawyer's fees, loans and interest, vehicle debt, credit card debt, unregistered loans and lines of credit do not reduce the estate's value.

The estate representative must file an Estate Information Return with the Ministry of Finance within 180 calendar days after the estate certificate is issued. If that deadline falls on a weekend or holiday, it moves to the next business day. Filing online is recommended, and the return can also be filed by mail, courier, fax or in person.

If information in a filed return turns out to be incorrect or incomplete, an amended return must be filed within 60 days of becoming aware of it, and this duty applies within four years of the certificate being issued. A representative who fails to file, or who makes false or misleading statements, may be fined at least $1,000 and up to twice the tax payable by the estate, imprisoned for up to two years, or both.

What to do next

If you are unsure whether an asset counts, or how to value it, confirm with a lawyer or accountant before you file the probate application.

Frequently asked questions

Are private company shares part of the estate's value?

Business interests and investments are included in the estate's value. They are valued at fair market value at the time of death. How a particular company should be valued depends on its facts, so an accountant or appraiser can help.

Do I need an appraiser?

You must be able to support values with documents, such as statements or an appraiser's opinion of value. For complex assets, a professional appraiser with expertise in that area may help recommend a value. Whether you need one depends on the asset.

How does a limited certificate affect the value used for Estate Administration Tax?

If the court issues a certificate limited to the assets in a specific will, only assets in that will count toward the estate's value. Whether this fits your case depends on the facts and the wills. A lawyer can tell you whether it is relevant.

Can debts reduce the value?

Only encumbrances on real property can be deducted, such as a registered mortgage or lien. Loans, credit card debt and lines of credit do not reduce the estate's value.

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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