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What Happens If the Estate Value Is Underreported in Ontario?

Realized the value on the estate application was too low? See how to correct it, the deadlines, the audit risk and the penalties in Ontario.

Wills & Estates5 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • If the value was wrong or incomplete, an amended return is due within 60 days of discovery, within four years of the certificate.
  • Newly found property needs a sworn statement of value filed with the registrar within six months, and tax on it is payable when it is delivered.
  • The Ministry can assess or reassess, generally within four years, with no limit where there was misrepresentation or fraud.
  • False or misleading information is an offence, though a reasonable-diligence defence exists.

You filed the application, the certificate was issued, and then you found something. Perhaps a bank account was missed, a house was valued too low, or an estimate turned out to be short. If you are the estate trustee, you may worry about what this means for you personally.

This article walks through how to correct an understated estate value in Ontario, the deadlines, and what the risks are. The sooner a mistake is fixed, the easier it generally is to explain. Because every file differs, speak with a lawyer or accountant before you act.

Why the value on the application matters

Estate administration tax is based on the value of the estate, which is the value disclosed under s. 32 of the Estates Act less the actual value of encumbrances on real property. The applicant must give the registrar a sworn or affirmed statement of the total value of the property that belonged to the deceased at death.

Value means fair market value at the date of death, supported by documents such as statements or appraisals. Real estate uses appraised value at the date of death. Only encumbrances on real property reduce the figure. Debts such as credit cards, loans and funeral costs cannot be deducted. A common cause of understatement is deducting something that is not allowed.

Common ways the value ends up too low

How to correct it

The route depends on why the figure was wrong. The deadlines in Ontario's guidance are summarized here.

SituationWhat to do and when
An estimated value was usedAmend the return within 60 days after the actual value is shared with the court
Information was wrong or incompleteAmend within 60 days of discovery, within four years of the certificate
New assets are foundReport and amend within 60 days after the statement is delivered to the court
Property discovered after the certificate issuesFile a sworn statement of its value with the registrar within six months; tax is payable when it is delivered

Additional tax can be paid to the court with an affidavit of the revised value and an explanation, or paid to the Ministry of Finance, which issues a confirmation to give to the court. Returns can be filed online, which is fastest, or by mail, courier, in person or fax. The Ministry can be reached at 1-866-ONT-TAXS (668-8297), Monday to Friday, 8:30 am to 5:00 pm.

The revised-return deadline is 60 days, extended from 30 days from January 1, 2020. Older versions of the regulation text may still show the earlier numbers, so rely on the current rule.

Interest, assessment and audit risk

Whether interest or other charges apply on additional tax, and how much, depends on the facts. We do not state a rate here. Ask the Ministry or a lawyer to confirm what applies to your file.

The Minister of Revenue may assess or reassess the tax. Assessments are generally allowed within four years after the tax became payable, but there is no such limit where there was a failure to comply with s. 4.1, misrepresentation or fraud. The Minister may also appoint inspectors, and estate representatives must keep records that allow the tax to be accurately determined.

If you disagree with an assessment, a Notice of Objection must be filed within 180 days of the Notice of Assessment.

Penalties and your position as trustee

Failing to file, or giving false or misleading information, is an offence. The fine is at least $1,000, or up to twice the tax if more, with up to two years' imprisonment, or both. A reasonable-diligence defence exists.

Ontario states the tax is paid by the estate, not by the estate representative, and the representative is liable only in a representative capacity. How this applies to you personally depends on your situation, so it is worth confirming with a lawyer. A lawyer can also help you document what happened.

What to do next

Frequently asked questions

How long do I have to fix an understated value?

If information was wrong or incomplete, you amend the return within 60 days of discovering it, and this applies within four years of the certificate. For property found after the certificate issues, a sworn statement of value is due to the registrar within six months.

Will I personally owe the extra tax?

Ontario states the tax is paid by the estate, not by the estate representative, and the representative is liable only in a representative capacity. Offences for false or misleading information are separate and can carry fines.

What interest will be charged on the extra tax?

That depends on the facts, and no rate is stated here. The Ministry of Finance or a lawyer can confirm whether interest applies to your situation.

Can the Ministry review the estate years later?

Assessments are generally allowed within four years after the tax became payable. There is no such limit where there was misrepresentation, fraud or a failure to comply with s. 4.1.

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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