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Can the Ministry of Finance Audit Your Estate Value After Probate?

See how Ontario's Ministry of Finance can reassess estate administration tax after probate, the time limits that apply, and how to fix underpayment.

Wills & Estates5 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • The Ministry of Finance's power is framed as assessment and reassessment of estate administration tax, generally within four years after the tax was due.
  • There is no time limit if a required filing was missed or there was misrepresentation or fraud.
  • If you find an error or a new asset, an amended Estate Information Return is generally due within 60 days.
  • Overpaid tax can also be recovered, within set time limits.

If you are an executor who worries you may have undervalued a house, an account or an investment, you are not alone. After probate is granted, the question becomes what the government can do about it and for how long.

This article explains how the Ministry of Finance can reassess an estate's tax, the time limits, what happens when tax was underpaid, and what to do if you spot a mistake. It is general information, and a lawyer or accountant can look at the details of your estate.

How the tax is set in the first place

For applications made on or after January 1, 2020, estate administration tax is $15 for every $1,000 of estate value, or part of $1,000, with the first $50,000 exempt. You pay it as a deposit when you apply, and it becomes the tax once the certificate is issued.

The tax rests on the value you report, so the Ministry's attention naturally falls on that figure. After the certificate, you must file the Estate Information Return within 180 calendar days.

Reassessment: the Ministry's power and its time limits

The Ministry of Finance may reassess an estate's tax within four years after the tax was due, which is the day the certificate is issued. In practice the power is framed as assessment and reassessment of the tax rather than an audit in the ordinary sense.

The four-year limit does not apply in every case. The Ministry may assess or reassess at any time if a required filing was missed or there was misrepresentation or fraud. If you disagree with a Notice of Assessment, you must file a Notice of Objection within 180 days of that notice.

IssueTime limit
Ministry reassessment in the ordinary courseWithin four years after the tax was due
Missed filing, misrepresentation or fraudAny time
Notice of ObjectionWithin 180 days of the Notice of Assessment
Amended return for incorrect or incomplete information60 days from becoming aware, and within four years of the certificate

What can go wrong with a valuation

Most disputes come from what was counted or left out. The estate value includes Ontario real estate less encumbrances, bank accounts including foreign banks, investments, RRSPs, RRIFs and TFSAs without a beneficiary designation, vehicles and vessels wherever located, property held in another person's name and insurance proceeds payable to the estate.

Ontario's guidance does not say a formal appraisal is mandatory. It describes a sworn, date-of-death value. A well-documented, honest valuation is your best protection, even though no outcome can be promised.

If tax was underpaid or you find a mistake

If information was wrong or incomplete, you need to file an amended Estate Information Return within 60 days of becoming aware of the problem, and within four years of the certificate being issued. New assets call for an amended return within 60 days after the statement is delivered to the court. Where an estimated value was used, the amended return is due within 60 days of the actual value being shared with the court.

Penalties are separate from the tax. A representative who fails to file, or who files false or misleading statements, may be fined at least $1,000 and up to twice the tax payable, imprisoned for up to two years, or both. Correcting an honest mistake promptly is generally far better than waiting to be found out, and a lawyer can help you with how to do it.

If you overpaid instead

Overpaid tax is recovered by making a request to the Ministry of Finance. The return must have been filed within four years of the certificate issuing, and the request must be made within 12 years of issuance or two years of a Notice of Assessment. A deposit paid on application can be refunded by the Superior Court only if the certificate has not been issued.

What to do next

Frequently asked questions

Is it really called an audit?

The Ministry's power is framed as assessing or reassessing the estate's tax rather than auditing in the usual sense. The practical effect is that it can revisit the amount of tax owed.

How long does the Ministry have to reassess?

Generally four years after the tax was due, which is the day the certificate is issued. If a required filing was missed or there was misrepresentation or fraud, it can assess or reassess at any time.

I found an asset I missed. What now?

New assets require an amended Estate Information Return within 60 days after the statement is delivered to the court. A lawyer or accountant can help you with the timing and the figures.

Can I get money back if I overpaid?

Possibly. You request recovery from the Ministry of Finance, subject to the filing and timing conditions, including a request within 12 years of issuance or two years of a Notice of Assessment.

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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