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Estate T3 Trust Return for Executors in Ontario: Deadlines

Learn when an Ontario estate must file a T3 trust return, how the year-end works, the 90-day deadline and the $500 filing threshold.

Wills & Estates4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 1, 2026
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Key takeaways
  • An estate's T3 return is due 90 days after the trust's tax year-end, and any balance owing is due in the same 90 days.
  • A graduated rate estate may use a non-calendar year-end, but only for up to 36 months after the death.
  • An estate generally files a T3 if its income is over $500, or if it makes a capital distribution to beneficiaries.

If you are the executor of an estate that keeps earning money after the death, such as interest, dividends or rent, the estate may need to file its own T3 trust return. That return is different from the final personal return for the person who died.

This article explains when a T3 is needed, how the year-end is set and when it is due. Every estate is different, so a lawyer or accountant can confirm how this applies to yours.

T3 return versus the final T1 return

Two kinds of returns often get mixed up. The final T1 return reports the deceased person's income up to the date of death. The T3 reports income earned by the estate after death.

For the final T1, a death from January 1 to October 31 means the return is due April 30 of the following year, and a death from November 1 to December 31 means it is due 6 months after the death. If the deceased, or a spouse or common-law partner living with them, was running a business on the date of death, the filing deadline moves to June 15 of the following year for deaths from January 1 to December 15, although payment is still due on the regular date.

As the legal representative, you must file all required returns for the deceased and make sure any balance owing is paid before you distribute the estate.

Does the estate have to file a T3?

A trust must file a T3 if it has total income from all sources of more than $500. It must also file, even at $500 or less, if it makes a capital distribution to beneficiaries. These filing rules changed for trust tax years ending on or after December 31, 2023, so older advice you find online may be out of date.

If you are unsure whether a small amount of interest or a one-time payout triggers a filing, ask an accountant before you assume nothing is needed.

Choosing the year-end

Most trusts must use a December 31 year-end. A graduated rate estate (GRE) is the exception, because it may have a non-calendar tax year.

An estate can be a graduated rate estate for no more than 36 months after the death. How your estate is treated once that period ends depends on the facts, so it is worth confirming with an accountant. Because the year-end you pick affects when everything is due, it is also worth discussing the choice with an accountant before the first return.

Due date and what to include

The T3 return must be filed no later than 90 days after the trust's tax year-end. Any balance owing is due within the same 90 days.

ItemRule
T3 filing deadline90 days after tax year-end
Payment of balance owingWithin the same 90 days
Filing thresholdIncome over $500, or any capital distribution
Year-endDecember 31 for most trusts; GRE may differ

If the estate pays executor fees, it must also file a T4 Summary and the related T4 slips. Fees paid to an executor who is not acting in the course of a business are income from an office or employment, reported in box 14 of a T4 with CPP and income tax deducted but no EI. A professional executor acting in the course of a business earns business income, reported on a T4A instead.

What to do next

Missing a deadline or guessing at a year-end can lead to problems that are hard to unwind, so a short conversation with a lawyer or accountant early on is usually worthwhile.

Frequently asked questions

Is the T3 return the same as the deceased's final tax return?

No. The final T1 reports the person's income up to the date of death, while the T3 reports income earned by the estate afterwards. Each has its own deadline.

What is the deadline for the estate T3?

It must be filed no later than 90 days after the trust's tax year-end, and any balance owing is due in the same 90 days.

Can the estate use a year-end other than December 31?

A graduated rate estate may have a non-calendar tax year, while other trusts generally must use December 31. An estate can be a graduated rate estate for no more than 36 months after the death.

Do I need to file a T3 if the estate earned very little?

A trust must file if its total income is more than $500, and it must also file at $500 or less if it makes a capital distribution to beneficiaries. An accountant can confirm your situation.

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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