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Estate Administration Tax Audit in Ontario: An Executor's Guide

Got a letter from the Ministry about probate tax? Learn the reassessment time limits, what the return covers, and how an Ontario executor can respond.

Wills & Estates4 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • The Ministry may assess or reassess Estate Administration Tax within four years after the day it was due.
  • There is no time limit where a filing was missed or a misrepresentation was made.
  • Keep the records supporting the Estate Information Return for four years.
  • A Notice of Objection must be filed within 180 days of a Notice of Assessment.

An official letter asking about the estate's probate tax can be unsettling, especially when you are already managing a death, a house and a long list of tasks. A letter does not by itself mean you did something wrong. It does mean you should respond carefully and on time.

This guide explains the time limits that apply, what the Estate Information Return covers, and a practical way to respond. Read any letter closely, and consider having a lawyer or accountant review it if the amounts are significant.

What Estate Administration Tax and the return cover

For certificate applications made on or after January 1, 2020, there is no tax on an estate worth $50,000 or less. Above that, the tax is $15 for every $1,000 (or part) of estate value, rounded up to the nearest thousand. The tax is based on the value of the estate at the date of death.

The initial Estate Information Return must be filed within 180 calendar days after the estate certificate is issued, even if the estate value is $0. It must list assets with values, tax owing or paid, the representatives, court file details and the certificate issue date.

Time limits that matter

TopicRule
Assessment or reassessmentWithin four years after the day the tax was due, which is the day the certificate is issued
Missed filing or misrepresentationNo time limit
Notice of ObjectionWithin 180 days of the Notice of Assessment
Refund requestWithin 12 years of the certificate's issue date or within 2 years of a Notice of Assessment
Record keepingFour years

If you receive a Notice of Assessment, mark the 180-day objection date on a calendar straight away. Missing that date can limit your options.

What to check on your own return

The details of any review depend on the letter you receive, so do not assume more than it says. In general, the figures that drive the tax are the total value of real property and personal property owned by the deceased at death. Real property that does not pass by right of survivorship generally needs probate.

Assets held with an adviser, dealer or financial institution may be reported as account-level totals, so statements showing the balance at death are useful support.

Penalties and fixing mistakes first

If you realise during the process that something was wrong, an amended return may be the right step. Amended returns are generally due within 60 days of the relevant trigger, such as becoming aware of incorrect or incomplete information within four years of the certificate being issued. A revised return is not required for errors discovered after the fourth anniversary of the day the tax became payable.

The stakes are real. Failing to file as required or making false or misleading statements can bring a fine of at least $1,000 and up to twice the tax payable, up to two years' imprisonment, or both. That is why honest, documented answers matter, and why advice is wise if you think the original return was inaccurate.

What to do next

Keep copies of everything you send and receive, and let the beneficiaries know if the outcome could affect what they receive.

Frequently asked questions

How far back can the Ministry reassess Estate Administration Tax?

The Ministry may assess or reassess within four years after the day the tax was due, which is the day the certificate is issued. There is no limit where a filing was missed or a misrepresentation was made.

How long should I keep the estate's records?

Estate representatives must keep the records supporting the Estate Information Return for four years. Many executors keep them longer, because other matters such as tax returns and passing of accounts may need them.

What can I do if I disagree with an assessment?

A Notice of Objection must be filed within 180 days of the Notice of Assessment. Get advice early so the objection is well supported.

Could I get money back if too much tax was paid?

Refund requests must be made within 12 years of the certificate's issue date or within 2 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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