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Estate Administration Tax Audits and Reassessments in Ontario

Learn how the Ministry of Finance can assess or reassess Ontario Estate Administration Tax, which time limits apply, and how to object to an assessment.

Wills & Estates4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 13, 2026
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Key takeaways
  • The Ministry of Finance may assess or reassess an estate's tax within four years after the day the tax was due, but there is no limit if a return was late or a misrepresentation was made.
  • A Notice of Objection to an assessment must be filed within 180 days from the day the Notice of Assessment was issued.
  • Keeping good records of how you valued each asset is the best protection if the Ministry questions your numbers.

If you are an estate trustee and the Ministry of Finance has contacted you about the Estate Administration Tax on an estate, it is natural to worry. Most of the time the questions come down to one thing: whether the value of the estate was reported correctly when probate was applied for.

This article explains the time limits the Ministry works within, what it usually looks at, and what you can do if you disagree with an assessment. The details of your situation matter, so a lawyer or accountant should review any notice you receive.

What the Ministry can look at

The Estate Administration Tax is charged only when an estate certificate (probate) is applied for and issued. The tax is paid by the estate, not personally by the estate representative. For certificates applied for 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.

An assessment or reassessment is really a question about value. The estate's value is rounded up to the nearest thousand dollars before the tax is calculated. Assets are valued at their fair market value at the time of death, and real property at its appraised value at the date of death, even if it later sells for more or less.

Time limits that apply

The Ministry of Finance may assess or reassess an estate's tax within four years after the day the tax was due. That limit does not protect every estate. If a return was not filed on time or a misrepresentation was made, the Ministry may assess or reassess at any time.

SituationTime limit
Ordinary assessment or reassessmentWithin four years after the day the tax was due
Return filed late or misrepresentation madeNo four-year limit
Notice of ObjectionWithin 180 days from the day the Notice of Assessment was issued
Keeping supporting recordsFour years

Common reasons for a reassessment

Reassessments often follow from how assets were counted. Knowing what belongs in the estate, and what does not, helps you check your own work.

Disagreeing with an assessment

If you dispute an assessment, a Notice of Objection must be filed within 180 days from the day the Notice of Assessment was issued. Missing that window can make the dispute much harder, so note the date on the notice as soon as it arrives.

Your best support is paperwork. Estate representatives must be able to back up asset 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. The records supporting the return must be kept for four years at the estate representative's principal place of business or residence.

If the Ministry is right and more tax is owing, the additional tax can be paid to the Superior Court of Justice or the Ministry of Finance, with an affidavit setting out the revised value of the estate at the time of death. If the tax was overpaid, refunds of tax already paid are requested from the Ministry of Finance, and a refund requires an Estate Information Return filed within four years of the certificate.

What to do next

Frequently asked questions

How far back can the Ministry go?

The Ministry may assess or reassess within four years after the day the tax was due. If a return was not filed on time or a misrepresentation was made, there is no four-year limit.

How long do I have to object to an assessment?

A Notice of Objection must be filed within 180 days from the day the Notice of Assessment was issued. Keep proof of when you received the notice.

Am I personally responsible for the tax?

The tax is paid by the estate, not personally by the estate representative. However, a representative who fails to file the return or makes false or misleading statements may face a fine of at least $1,000 and up to twice the tax payable, imprisonment of up to two years, or both.

What records should I keep?

Keep the records supporting the Estate Information Return for four years at your principal place of business or residence. This includes statements or appraisals backing up the values you reported.

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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