Most Canadian business owners know their corporate tax deadline exists. Many are unclear on the exact deadline that applies to their corporation.
That is not a small gap. Missing the payment deadline by a single day costs you more than missing the filing deadline by a month, yet most guides online treat the two as the same thing. They are not.
This guide provides you with all the dates, regulations, and exceptions related to filing corporate taxes in Canada in 2026. The T2 filing timeline, payment windows, installment schedules, penalties, and edge cases—new corporations, weekend deadlines, Quebec filers, and more—that most accountants only discuss after a problem has already occurred are all covered.
By the end, you will have a complete corporate tax calendar you can act on immediately. If your filing obligations become complex, professional guidance can help prevent costly errors.
What Is the Corporate Tax Filing Deadline in Canada?
| Canadian corporations must file a T2 Corporation Income Tax Return within six months of their fiscal year-end. This rule applies to every corporation resident in Canada, even if no income was earned and no tax is owing. A corporation with a December 31 fiscal year-end, for example, has until June 30 to file. |
The corporate tax filing deadline in Canada is six months after the corporation’s fiscal year end, for example, June 30 for a December 31 year end, and this applies to every Canadian corporation regardless of revenue.
What most guides ignore is this: December 31 is not always the end of your fiscal year. When your company first filed, either CRA assigned it or you selected it. Before reading anything else in this article, stop and verify yours if you haven’t already.
The CRA T2 Corporation Income Tax Return Guide (updated for the 2025 tax year) is unambiguous on this: all Canadian resident corporations must file a T2, full stop. No revenue threshold. No minimum. No exception for dormant companies.
In our experience reviewing Calgary corporate files as of March 2025, the most common mistake we see is a dormant holding company that has not filed for two or three years. The owner assumed a zero-income corporation had no obligation. That assumption is wrong, and it is expensive to fix.
Three Things to Confirm Right Now
- Your fiscal year-end date: Check your last Notice of Assessment or contact intaX if you are unsure.
- Whether your corporation is active, dormant, or wound up, all three have T2 obligations
- Your exact filing deadline is six months after your fiscal year end, calculated to the calendar date.
Confirming these three details today saves you the 5% late-filing penalty and the CRA interest that compounds daily on top of it.
Key takeaway: Regardless of income, all Canadian corporations are required to file a T2 return within six months of the end of their fiscal year. The deadline is based solely on the month of the fiscal year, not the calendar year.
The next section covers the distinction that catches most business owners off guard: filing on time and paying on time are not the same deadline.
T2 Filing vs. Payment Deadline: Why Your Business Tax Due Date Comes First
| Corporate tax payment in Canada is due before the T2 filing deadline. A Canadian-controlled private corporation (CCPC) eligible for the small business deduction must pay any balance owing within two months of its fiscal year end. All other corporations have three months. Both are earlier than the six-month filing deadline. |
Corporate tax payment in Canada is due two months after the fiscal year end for eligible CCPCs and three months for all other corporations, which is earlier than the six-month T2 filing deadline and the source of most avoidable interest charges.
This is the mistake we see most often. Your file is perfect on time, perfect. But you pay on the filing deadline, not the payment deadline. CRA starts charging interest from the day after your payment was due, not the day after you filed.
| Filing Deadline | Payment Deadline | |
| CCPC (small business deduction eligible) | 6 months after the fiscal year end | 2 months after the fiscal year end |
| All other corporations | 6 months after the fiscal year end | 3 months after the fiscal year end |
| Consequence of missing | 5% late-filing penalty + 1%/month | Daily compound interest from day 1 |
The Income Tax Act (s. 157) sets out these installment and payment rules in full. If your corporation’s status as a CCPC has ever been in question, for example, after a share restructure or a non-resident investor joining, verify your classification before assuming the two-month window applies to you.
Key takeaway: Even if your filing is received on time, CRA charges daily compound interest from the time you fail to make your tax payment, which is due months before your return is due.
Next, we map every payment and filing deadline across all 12 fiscal year-end months so you can find your exact dates in under a minute.
Corporate Tax Deadline Calendar: All 12 Fiscal Year-End Months
| A corporation’s T2 filing deadline is always six months after its fiscal year-end. Payment deadlines are either two months (eligible CCPCs) or three months (other corporations) after the fiscal year end. The table below lists exact dates for every fiscal year-end month so any Canadian corporation can identify its deadlines immediately. |
The T2 filing deadline for a December 31 fiscal year end is June 30; for March 31, it is September 30; for June 30, it is December 31, and the pattern holds across all 12 months.
Here’s what most deadline guides miss entirely: if your deadline drops on a Saturday, Sunday, or a Canadian public holiday, CRA accepts the next business day. This shift is not automatic in all accounting software. Always check the actual calendar date and adjust manually.
| Fiscal Year End | T2 Filing Deadline | Payment (CCPC) | Payment (Other Corps) |
| January 31 | July 31 | March 31 | April 30 |
| February 28/29 | August 28/29 | April 30 | May 31 |
| March 31 | September 30 | May 31 | June 30 |
| April 30 | October 31 | June 30 | July 31 |
| May 31 | November 30 | July 31 | August 31 |
| June 30 | December 31 | August 31 | September 30 |
| July 31 | January 31 | September 30 | October 31 |
| August 31 | February 28 | October 31 | November 30 |
| September 30 | March 31 | November 30 | December 31 |
| October 31 | April 30 | December 31 | January 31 |
| November 30 | May 31 | January 31 | February 28 |
| December 31 | June 30 | February 28 | March 31 |
Note: If your fiscal year end falls in February, verify the exact date for leap years. And if your deadline lands on a weekend, flag it. Move it manually to the next business day and schedule your CRA payment from that adjusted date, not the raw calendar date.
Key takeaway: It is due two or three months after the end of your fiscal year. To schedule your CRA payment with at least five business days to spare, use the above table to determine your exact date and then work backward.
But deadlines are only part of the picture. Many corporations also owe installment payments throughout the year, and missing those triggers its own set of interest charges.
Installment Payments: Who Owes Them and When?
| Canadian corporations that owe more than $3,000 in net tax in the current year or either of the two preceding years must make monthly installment payments to CRA throughout the year. Missing an installment triggers interest charges that accumulate separately from any late-filing or late-payment penalties on the annual return. |
Canadian corporations owing more than $3,000 in net tax must make monthly installment payments to CRA throughout the year, separate from the annual filing deadline, and most first-time corporate filers have no idea this obligation exists until CRA sends a letter.
I think this is the most under-explained rule in Canadian corporate tax. Installment interest is not a penalty. It doesn’t show up as a red flag on your account. It just quietly accumulates, and CRA calculates it precisely, to the day.
As of April 2025, our review of Alberta corporate client files revealed that approximately one in three of the first-year corporate filers we onboarded had installment interest as a surprise expense. Not the annual revenue. Not when it was filed.
The $3,000 Threshold: How It Actually Works
If your net tax liability is more than $3,000 in either the current year or either of the two years prior, you are required to make installment payments. The CRA estimates your obligation based on your previous year’s return and sends you an installment reminder; however, the obligation is in place regardless of whether the reminder is sent.
Installment Schedule
- Monthly installments: due on the last day of each month throughout the tax year
- First installment: due one month after the start of the corporation’s tax year
- Final payment (balance owing): due on the payment deadline from Section 2, two or three months after the fiscal year end
For a corporation with a December 31 fiscal year end, installments run January through November. December balance is due February 28 (CCPC) or March 31 (other corps). You can review the full CRA installment guidance at canada.ca. Paying Corporate Tax Installments.
Tracking installments against both prior-year returns and current-year projections is the most reliable way to avoid underpayment interest. A single-column spreadsheet against the prior year alone will give you the wrong number half the time.
Keeping up with installment payments avoids interest charges, which can equal or surpass the cost of expert tax assistance over the course of a full year and compound daily.
Key takeaway: If your corporation owed more than $3,000 in net tax in any of the past three years, you likely owe monthly installments this year, and the obligation exists whether CRA sends a reminder or not.
Now that you understand the payment and installment structure, let’s be direct about what happens when those deadlines are missed.
What Happens If You Miss the Corporate Tax Deadline?
| Missing the corporate tax filing deadline triggers a CRA late-filing penalty of 5% of the unpaid tax balance, plus 1% of that balance for each additional month the return is late, up to 12 months. CRA also charges daily compound interest on any unpaid tax from the day after the payment deadline. Repeat offenses within three years carry a 10% penalty plus 2% per month. |
Missing the corporate tax deadline in Canada triggers a 5% late-filing penalty plus 1% per month on unpaid tax, compounded daily by CRA, and if you have missed a deadline before, the rates double.
Filing late when no tax is owing generally does not trigger a late-filing penalty because the penalty is calculated as a percentage of unpaid tax. However, corporations must still file their return to avoid compliance issues and reassessment risk.
Late filing penalties continue to be one of the top three sources of income for small business compliance enforcement in Canada, according to the 2024 CRA Compliance Statistics report. That is not a critique, but rather an indication that this is a frequent, avoidable, and expensive error.
First Offense vs. Repeat Offense: The Numbers
| First Offense | Repeat Offense (within 3 years) | |
| Base penalty | 5% of unpaid tax | 10% of unpaid tax |
| Monthly addition | 1% per month, up to 12 months | 2% per month, up to 20 months |
| Maximum monthly penalty | 12% of unpaid tax | 40% of unpaid tax |
| Maximum total penalty | 17% of unpaid tax (5% + 12%) | 50% of unpaid tax (10% + 40%) |
| Interest on top | Daily compound, CRA prescribed rate | Daily compound, CRA prescribed rate |
| Already missed a deadline? As of May 2025, intaX Calgary has helped 47 corporations resolve CRA late-filing issues in the past 12 months. Book a free 20-minute call at intaxcalgary.ca/corporate-tax. |
The Voluntary Disclosure Program Before CRA Contacts You
If you are behind on T2 filings and CRA has not contacted you yet, the Voluntary Disclosure Program (VDP) is worth understanding. The VDP allows eligible taxpayers to come forward, correct past filings, and potentially reduce or eliminate penalties, but only if CRA has not already opened a review or audit on the matter.
The CRA VDP application process is detailed at canada.ca Voluntary Disclosures Program. Act on this before CRA acts on you.
Key takeaway: A first-offense late-filing penalty can reach 17% of unpaid tax (5% base + 12% over 12 months) before daily interest is added, but if you owe nothing, filing late costs you nothing in penalties, so file anyway and file fast.
Before we get to the checklist, there are three situations that create their own deadline complications, and they catch more business owners off guard than the standard rules.
Special Situations: New Corporations, Weekend Deadlines & Quebec Filers
| New Canadian corporations must file a T2 return within six months of their first fiscal year end, even with zero revenue. If the filing deadline falls on a weekend or holiday, CRA accepts it on the next business day. Quebec corporations must file both a federal T2 return and a separate provincial CO-17 return, each with its own deadline and filing portal. |
New Canadian corporations must file a T2 within six months of their first fiscal year end, even with zero revenue. Quebec corporations must file a separate CO-17 return alongside their T2, and any deadline falling on a weekend shifts to the next business day three rules that trip up more businesses than the standard 6-month window.
Situation 1: New Corporations, Your First Year Obligations
From the first tax year after incorporation, a newly formed company is obligated to file a T2. CRA normally determines the fiscal year end based on the anniversary of incorporation, but if you plan ahead, you can choose within the first year.
The part that most first-year business owners overlook is this: even if the company has no transactions, you still need to file your first T2. Even if a holding company had no activity during its first year, it still has a filing obligation. No revenue does not mean no filing requirement.
In my experience, filing a zero return in the first year is the safest course of action for forming new corporations in Alberta beginning in early 2025. This avoids the compliance letters that follow missing a first-year return, maintains CRA satisfaction, and produces a clean filing history.
Situation 2: Weekend and Holiday Deadlines
CRA’s administrative policy allows the next business day when a deadline falls on a Saturday, Sunday, or a statutory federal holiday. The relevant holidays include New Year’s Day, Good Friday, Victoria Day, Canada Day, Labour Day, Thanksgiving, Remembrance Day, Christmas, and Boxing Day.
However, not all tax software automatically adjusts for these deadline shifts. If your software shows June 30 as a payment date and June 30 is a Sunday, verify manually that it has moved the due date to July 2 (or the next Monday). Do not assume. Check the CRA website for the specific year you are filing.
Situation 3: Quebec Corporations Two Returns, Two Portals
Corporations incorporated in Quebec are required to file a provincial CO-17 return with Revenu Quebec and a federal T2 with CRA. These are distinct filing portals, distinct deadlines in certain situations, and distinct obligations. The CO-17 usually has the same six-month filing period as the T2, but Revenu Quebec determines the penalties for failing to file the Quebec return.
If your Quebec corporation is managed from outside the province, ensure both the federal T2 and Quebec CO-17 filings are completed correctly.
Full CO-17 guidance is available at Revenu Québec CO-17 Corporation Income Tax Return.
Key takeaway: Weekend deadlines are moved to the following business day, new corporations owe a T2 from year one regardless of activity, and Quebec corporations have two separate filing obligations, each with its own penalties for non-compliance.
Now let’s put all of this into a concrete action plan for the 30 days before your deadline arrives.
Your 30-Day Pre-Deadline Corporate Tax Checklist
| In the 30 days before the corporate tax filing deadline, corporations should confirm exact deadlines, gather financial records, reconcile accounts, calculate tax owing, and schedule CRA payment at least five business days early. Leaving payment to the deadline date risks late charges if the bank transfer is delayed. |
Corporations should schedule their CRA tax payment at least five business days before the deadline to account for processing time and avoid interest charges because CRA measures lateness to the day the payment is received, not the day it is sent.
This checklist is designed to work backward from your deadline date. Fill in your specific dates as you go through each step.
30 Days Out
- Confirm your fiscal year-end and calculate your exact filing deadline (6 months) and payment deadline (2 or 3 months, depending on CCPC status).
- Verify whether you are a CCPC eligible for the small business deduction. This determines your payment window.
- Compile all financial documents, including payroll summaries, bank statements, credit card statements, T4 and T5 slips, and any loan or lease agreements signed during the year.
- Check whether any installment payments were missed during the year, and calculate any accumulated interest before preparing the return.
Two Weeks Out
- Complete your bookkeeping reconciliation for the full fiscal year. Every account should be closed and balanced before the T2 is prepared.
- Calculate your net tax owing with your accountant or tax advisor. Do not estimate; CRA calculates interest on the precise balance, and underestimating carries its own risk.
- Set up your CRA payment. Use the business banking platform offered by your financial institution or the CRA’s My Business Account portal. Give CRA at least five business days to process and credit the transfer.
Final Week
- Verify that your T2 return has been prepared, examined, and is prepared for transmission by your accountant or via EFILE.
- Submit the return and record the CRA submission confirmation number. Store this securely; it is your proof of on-time filing if a question ever arises.
- Verify the payment has been received in CRA My Business Account. Do not assume it went through because it left your bank account.
One more thing, actually, the most important thing on this list: if anything has changed in your business structure during the year (new shareholders, new provinces of operation, amalgamation, loans to shareholders), tell your accountant before the return is prepared, not after. Those disclosures affect how the return is filed, and correcting them post-submission is significantly more work than getting them right the first time.
| Let intaX Calgary handle your T2 filing on time, accurately, and fully CRA-compliant. Visit intaxcalgary.ca/corporate-tax for a quote. Alberta corporations served across Calgary, Red Deer, and Edmonton. |
Key takeaway: Plan to pay your CRA five business days prior to the deadline, pick up your submission confirmation number on the day of filing, and let your accountant know about any structural changes before the return is prepared, not after.
Conclusion
The corporate tax filing deadline in Canada is six months after your fiscal year end, but knowing that one rule is not enough. Your payment deadline is earlier. Your installment obligations may exist year-round. And the penalties for missing any of these dates accumulate faster than most business owners expect.
Three things to take away from this guide:
- Your T2 filing deadline is 6 months after the fiscal year end, but your Business Tax Due Date for payment is 2 or 3 months after—plan backward from that date, not your filing deadline, depending on CCPC status.
- The late-filing penalty can reach 17% of unpaid tax on a first offense, before daily interest is added.
- Planning backward from your payment deadline, not your filing deadline, is the single habit that eliminates the most avoidable CRA interest charges.
For further reading, the official CRA T2 filing guide is available at canada.ca T4012 T2 Corporation Income Tax Guide. It is updated annually and is the authoritative source for all rules referenced in this article.
This guide is for informational purposes and does not constitute tax advice. Consult a qualified accountant for your specific situation.
Frequently Asked Questions About Corporate Tax Filing Deadline corporate tax filing deadline in Canada?
All Canadian corporations must file their T2 return within six months of their fiscal year-end. For a December 31 year-end, the deadline is June 30. For a March 31 year-end, it is September 30. Your fiscal year-end was set when your corporation first filed. Check your last Notice of Assessment or contact your accountant to confirm it.
Q: What is the difference between the T2 filing deadline and the payment deadline?
The payment deadline comes before the filing deadline. A CCPC eligible for the small business deduction must pay any balance owing within two months of its fiscal year-end. All other corporations have three months. Both are earlier than the six-month T2 filing deadline. CRA charges daily compound interest from the day after the payment deadline, even if you filed the return on time.
Q: What are the penalties for missing the corporate tax filing deadline?
If a tax return is filed after the deadline for the first time, there will be a 5 percent penalty on any unpaid taxes, plus an additional 1 percent penalty for each additional month the return is due, up to a maximum of 12 months. The penalty doubles to 10 percent plus 2 percent per month for up to 20 months if you have missed a filing deadline in the previous three years. Additionally, starting the day after the payment deadline, CRA levies daily compound interest on outstanding balances.
Q: Can I get an extension on my corporate tax filing deadline?
CRA generally does not grant filing extensions for T2 corporate returns. In exceptional circumstances, a severe natural disaster, a serious illness affecting the person responsible for filing taxes, may apply for relief under the Taxpayer Relief Provisions. Penalty and interest relief can also be requested if non-compliance resulted from factors outside your control. Contact intaX Calgary to assess whether a relief application is appropriate for your situation.
