T2 Corporate Tax Return Deadline 2026: When Yours Is Due

» Quick Answer: Your T2 Deadline in One Sentence

» Why This Deadline Trips Up So Many Incorporated Owners

If your corporation’s fiscal year ended on June 30, 2026, your T2 corporate income tax return is due on December 31, 2026. Many incorporated Ontario owners with summer year-ends are inside that window right now, and the six-month clock is easy to misread.

The confusion is rarely about the filing date itself. It is about the second, earlier deadline that most owner-managers do not realise exists — the balance-due day, when any corporate tax owing must actually be paid. Missing that quieter date is one of the most common ways small businesses hand avoidable interest to the Canada Revenue Agency (CRA).

This guide walks through the six-month T2 filing rule in plain English, explains how the payment deadline differs, and shows what to do if you have already missed the date.

» Quick Start: Pick Your Path

Use the path that matches your situation:

» How the Six-Month Rule Actually Works

Every Canadian resident corporation must file a T2 corporation income tax return within six months of the end of its fiscal year. This is a fixed rule under the Income Tax Act and does not depend on the size of the corporation, the amount of income, or whether any tax is owing.

How CRA calculates the six months depends on when your fiscal year ends:

• →Month-end rule: if your fiscal year ends on the last day of a month, the T2 filing due date is the last day of the sixth month that follows. A December 31 year-end means a June 30 filing deadline.
• →Mid-month rule: if your fiscal year ends mid-month, the filing due date is the same calendar day six months later. A September 23 year-end means a March 23 filing deadline.
• →Weekend and holiday extension: if your filing date falls on a Saturday, Sunday, or CRA-recognized public holiday, your return is on time if CRA receives it by the next business day.

Fiscal year-end planning matters. Our fiscal year 2026 planning guide walks through how the year-end date interacts with the T2 clock and cash flow. The mid-month rule is a common source of missed deadlines because owners assume the return is due at month-end.

» Filing Date vs. Balance-Due Day: The Difference That Costs Interest

This is the single most expensive misunderstanding in Canadian corporate tax. Filing on time avoids the late filing penalty. Paying on time avoids arrears interest. They are governed by different clocks, and both matter.

The general rule for balance-due day is two months after fiscal year-end. Eligible CCPCs that meet specific CRA conditions — including having claimed the small business deduction and staying within the taxable capital threshold — generally get an extra month, for a three-month payment deadline. For a December 31, 2025 year-end, that means February 28, 2026 for a general corporation and March 31, 2026 for an eligible CCPC.

Corporate income tax rates matter here too. Our explainer on Canada’s corporate tax rates covers how the federal general rate, the small business deduction, and provincial layers interact — useful context when estimating what to pay before the return is prepared.

» Ontario Corporation Tax Rides on the Same Return

Ontario incorporated businesses only file one corporate tax return. Ontario Corporation Tax is administered by CRA and reported on the same T2, so a single filing covers both the federal and Ontario obligations for most corporations. One deadline, one return, one payment channel.

The provincial small business deduction rate and thresholds vary from year to year. Our Ontario small business tax rate 2026 breakdown covers the current combined rate for SBD-eligible CCPCs and how it stacks with the federal rate.

Quebec and Alberta are the two provinces that stand apart. Corporations with a permanent establishment in Quebec must also file a separate CO-17 with Revenu Québec, and Alberta requires a separate AT1 return with Tax and Revenue Administration. Ontario-only corporations avoid that extra step.

» Step-by-Step Roadmap: From Year-End to Filed T2

Working backwards from your six-month T2 filing deadline is the safest way to stay on time. This is the standard sequence most Ontario incorporated owners follow.

1. 1
   Close the books for the fiscal year.Reconcile bank and credit card accounts, post year-end adjusting entries, and finalize the trial balance within four to six weeks after year-end.
2. 2
   Estimate corporate tax owing.You need this before the balance-due day at month two or three. Use last year’s return as a starting point and adjust for material changes.
3. 3
   Pay the balance owing by the balance-due day.Even if the T2 return itself is not ready, an accurate payment stops arrears interest. CRA accepts online banking, My Payment, or pre-authorized debit.
4. 4
   Prepare the T2 return and supporting schedules.Include Schedule 100 (balance sheet), Schedule 125 (income statement), Schedule 50 (shareholder information), and any credit or deduction schedules that apply.
5. 5
   E-file the return through CRA-certified software before the six-month deadline.Our overview of the current landscape in CRA Canada 2026: what small businesses need to watch now covers program changes affecting incorporated filers.
6. 6
   Retain records for at least six years.CRA can request supporting documentation for six years from the end of the tax year the records relate to.

Following this sequence keeps payment and filing in the right order, which is the point of the entire exercise.

» What Happens if You Miss the T2 Deadline

On a $20,000 balance owing filed twelve months late, the penalty alone works out to 17 percent, or $3,400. That is before arrears interest, calculated daily at the CRA prescribed rate.

A higher penalty applies in narrow circumstances. If CRA formally demanded the return and there was also a late filing in any of the three preceding tax years, the penalty rises to ten percent plus two percent per full month, up to twenty months. Most first-time late filers do not fall into this category.

If you are already late, filing immediately stops the monthly penalty from growing. The CRA Voluntary Disclosures Program may reduce penalties in limited cases, though acceptance is at CRA’s discretion. Our companion article on what to do when you have missed a tax deadline covers recovery steps in detail.

» Common Mistakes Ontario Incorporated Owners Make

These are the recurring mistakes we see across Ontario incorporated files each year. Each has a fix that takes minutes once you know what to look for.

• →Paying corporate tax on the filing deadline instead of the balance-due day. Payment arrives four months earlier for general corporations and three months earlier for eligible CCPCs. Waiting until the T2 is finalized generates avoidable arrears interest.
• →Skipping the nil return in inactive years. A dormant corporation still owes CRA a T2 every year it exists. Missing the filing triggers the same late filing penalty even when no tax is owing.
• →Filing on paper when e-filing is mandatory. For tax years starting after 2023, most corporations must e-file. Non-compliance carries a $1,000 penalty on top of anything else.
• →Ignoring quarterly or monthly installments. Corporations owing more than $3,000 in federal or Ontario tax typically must pay by installments, and skipping them creates installment interest that compounds daily.
• →Assuming Ontario needs a separate return. Ontario CT is filed on the same T2. Our CRA audit checklist for small businesses covers the documentation habits that catch these errors early.

» Frequently Asked Questions

Sources & References

1. Canada Revenue Agency — When to file your corporation income tax return
2. Canada Revenue Agency — Balance-due day
3. Canada Revenue Agency — Interest and penalties on late or incorrect payments
4. Canada Revenue Agency — Corporation instalments
5. Canada Revenue Agency — Mandatory electronic filing of the T2 return
6. Canada Revenue Agency — Voluntary Disclosures Program
7. Ontario Ministry of Finance — Corporate Income Tax
8. Income Tax Act (R.S.C., 1985, c. 1 (5th Supp.)) — Justice Laws