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№ 22 Wills & Estates

Choosing the Estate's Fiscal Year-End as Executor in Ontario

Learn how an Ontario executor can set a graduated rate estate's first year-end, how it affects T3 deadlines, and what to ask an accountant.

Wills & Estates6 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • The legal representative can set a graduated rate estate's first tax year-end at any date up to one year after the death.
  • The T3 return is generally due 90 days after the trust's year-end, so the date you pick drives your deadline.
  • Graduated rate estate status lasts for up to 36 months after death, and the estate has a deemed year-end when that status ends.
  • Testamentary trusts that are not graduated rate estates do not get this choice and have a December 31 year-end.

When someone dies, their executor (the estate trustee) often assumes the estate has a calendar year-end, like most individual taxpayers. For many estates that is not the rule. An estate that qualifies as a graduated rate estate can choose when its first tax year ends, and that choice affects when the T3 return is due.

This article explains what a graduated rate estate is, how the year-end choice works, and what to think about before you pick a date. It is general information, not tax advice. The right date depends on the estate's income, assets and plans, so it is worth confirming with an accountant or lawyer.

What a graduated rate estate is and why it gets a choice

A graduated rate estate, often shortened to GRE, is a special tax status for the estate of a deceased person. The estate is treated as a trust for tax purposes, and the executor files T3 trust returns for it. GRE status matters because its income is taxed at the same graduated rates as individuals.

There are conditions. An estate can only be a GRE for up to 36 months following the death, it must be a testamentary trust, and it must include the deceased's SIN on its T3 returns and designate itself as the GRE in its T3. Only one estate per individual can be the GRE.

The year-end choice comes with that status. The legal representative can set the GRE's first tax year-end at any date up to one year after death. Testamentary trusts that are not GREs have a December 31 year-end.

How the year-end drives your T3 deadline

A GRE's T3 return is due 90 days after the trust's tax year-end, or 90 days after the final distribution if the estate winds up that way. So the year-end you choose sets the filing date. A year-end soon after death means an earlier first return. A year-end further out gives more time before the first return is due, up to the one-year limit.

The deadline for the return and the deadline for any balance owing are tied together. When the estate stops being a GRE, there is a deemed year-end on that day, which can be no later than 36 months after death. The T3 and balance owing are due within 90 days of that year-end. If the estate ends by final distribution, the year ends on that date and the return is due 90 days later. Late-filing penalties can apply.

SituationYear-endT3 due
GRE, first yearAny date you set, up to one year after death90 days after that year-end
GRE status ends (no later than 36 months after death)Deemed year-end on the day it ceases to be a GREWithin 90 days of that year-end
Estate wound up by final distributionThe date of final distribution90 days later
Testamentary trust that is not a GREDecember 31Based on that year-end

Why the date matters for planning

Choosing a year-end is not only about paperwork. Because a GRE is taxed at graduated rates like an individual, how income is spread across tax years can matter. Which year-end suits the estate depends on what income it expects and when, so this is a good question to put to an accountant.

There is rarely one obviously correct answer. Beyond the points above, how the choice affects tax payable depends on the facts, and a tax professional can model it.

Related filings that run on different clocks

The estate's T3 year-end is separate from the deceased's final personal return. The final T1 is due April 30 of the following year for deaths from January 1 to October 31, or six months after death for deaths from November 1 to December 31. For a self-employed person the filing date is June 15, or six months after death for deaths from December 16 to 31, but payment is still due on the original date.

A Rights or Things return, where it applies, is due the later of one year after death or 90 days after the final return's assessment.

Before the estate can file a T3 electronically for the first time, the trustee needs a trust account number. You can apply online or with Form T3APP, which is not sent with the T3 return. The number must appear on every T3 return, and a $100 penalty is noted for failing to provide it.

What to do next

Treat the year-end as a decision to make early, not a detail to discover when the first return is due. These steps can help you work through it.

If the estate is large, has complicated assets, or beneficiaries disagree about timing or distributions, a lawyer can explain your duties as estate trustee, and an accountant can handle the tax side.

Frequently asked questions

Can every estate choose its own year-end?

No. The choice is described for graduated rate estates, where the legal representative can set the first tax year-end at any date up to one year after death. Testamentary trusts that are not GREs have a December 31 year-end.

When is the T3 return due for a graduated rate estate?

It is due 90 days after the trust's tax year-end, or after the final distribution. Late-filing penalties can apply.

How long can an estate stay a graduated rate estate?

For up to 36 months following the death. The estate has a deemed tax year-end on the day it ceases to be a GRE, and the T3 and any balance owing are due within 90 days of that year-end.

Do I need a trust account number before filing the T3?

Yes. Trustees apply online or with Form T3APP, and a trust filing for the first time needs the account number before filing electronically. The number must be on every T3 return, and a $100 penalty is noted for failing to provide it.

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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