Corporate Tax Deadlines in Canada: T2 Filing, Payment, and Instalment Dates for 2026

Missing corporate tax deadlines in Canada can get expensive fast. If you file late, the CRA (Canada Revenue Agency) can charge a penalty of 5% of your unpaid balance plus 1% for each full month you’re late (up to 12 months). If you pay late, interest starts adding up too. The good news is that these deadlines are predictable — once you know the rules, you can build a system around them.

Here at Premium Bookkeeping & Accounting, corporate tax compliance is one of the most common areas where we help Canadian small businesses avoid penalties, usually because of a timing gap they didn’t know existed.

This guide explains the key 2026 rules behind the corporation tax filing deadline, your corporate tax payment deadline (the “balance-due day”), and instalment schedules.

For hands-on help managing your corporate tax timeline, our fixed-scope corporate year-end packages are built around exactly this kind of compliance work.

Let’s dig in.

Important: Your T2 filing deadline and your payment deadline are not the same date. The return is due 6 months after year-end. Your payment is usually due 2 months after year-end (3 months for eligible CCPCs). Missing the payment deadline while waiting to file is one of the most common — and costly — mistakes we see.

Understanding Corporate Tax Deadlines in Canada

Corporate tax deadlines in Canada usually fall into three buckets:

• Filing deadline: when your T2 return must be submitted
• Payment deadline (balance-due day): when any remaining tax owing must be paid
• Instalment deadlines: periodic pre-payments during the year (monthly or quarterly)

Your deadlines are based on your fiscal year-end (your corporation’s tax year), not the calendar year, although many corporations use December 31.

Filing vs. Payment vs. Instalment Deadlines

T2 Corporate Tax Return Filing Deadline

For most corporations, the corporate tax return deadline in Canada is straightforward: your T2 Corporation Income Tax Return is due 6 months after the end of your fiscal year.

The exact date depends on how CRA calculates “6 months after.” CRA uses two common approaches:

• Month-end rule: if your year-end is the last day of a month, your return is due on the last day of the month that is 6 months later.
• Same-day rule: if your year-end is not the last day of a month, your return is due on the same day number, 6 months later.

How CRA Calculates Your Filing Due Date

Weekend/holiday rule: If your filing deadline falls on a Saturday, Sunday, or CRA-recognized public holiday, CRA treats the deadline as the next business day.

Mandatory Electronic Filing

Most corporations are required to file the T2 return electronically. Even if paper filing is allowed in limited cases, e-filing is usually faster and helps avoid processing delays.

Tip: Don’t wait until the last week to file. If your software, CRA credentials, or signing authority aren’t set up, you can lose days you don’t have.

Corporate Tax Payment Deadline (Balance-Due Day)

Your corporate tax payment deadline in Canada is not the same as your filing deadline. The payment deadline is called your balance-due day.

• For most corporations, the balance-due day is 2 months after the fiscal year-end.
• For eligible Canadian-Controlled Private Corporations (CCPCs), it can be 3 months after the fiscal year-end.

This is where many business owners get caught: you can be “on time” for filing (6 months) and still be late on payment (2–3 months). For a Dec 31, 2025 year-end, the general balance-due date is March 2, 2026 — not February 28, because Feb 28 falls on a Saturday in 2026 and the weekend rule pushes it to the next business day.

Balance-Due Day Examples (2-Month vs. 3-Month)

* Feb 28, 2026 falls on a Saturday — weekend rule moves the deadline to March 2, 2026.

The federal small business rate for eligible CCPCs remains 9% for 2026. For a complete rundown of what else changed — including updated brackets, CPP/EI ceilings, and RRSP limits — see our 2026 small business tax changes guide.

Extended Deadline for CCPCs

A CCPC is a Canadian-controlled private corporation. Many small and mid-sized businesses fall into this category, but not all CCPCs automatically qualify for the extended 3-month payment deadline.

In general terms, CRA’s extended payment deadline is meant for corporations that:

• Are CCPCs throughout the year
• Claim (and qualify for) the small business deduction
• Stay within certain taxable income and taxable capital limits
• Have taxable income allocated to an associated group that stays within limits

Tip: If you think your CCPC qualifies for the extended deadline, confirm eligibility with your accountant before relying on it. Then plan your cash flow as if payment is due in 2 months anyway — treat the extra month as a buffer, not a strategy.

Tax Instalment Payment Deadlines

If your corporation’s total tax payable is generally more than $3,000 (in the current year or a prior year), CRA may require instalment payments. Instalments are pre-payments that reduce the balance you owe at year-end.

When Instalments Are Usually Required

Instalments are commonly required when:

• Your current-year tax payable will exceed $3,000, or
• Your prior-year tax payable exceeded $3,000

If you have a short tax year (for example, you changed your year-end), instalment requirements can change. Some corporations may be exempt from instalments for that short year, depending on the facts.

Monthly vs. Quarterly Instalments

• Most corporations: pay monthly instalments.
• Some eligible CCPCs: may pay quarterly instalments.

Quarterly instalments can be helpful for cash flow, but only if you clearly qualify. Paying quarterly when CRA expects monthly can trigger interest.

Monthly Instalment Due Dates (2026) — Calendar-Year Corporation

For a calendar-year corporation (Dec 31 year-end), instalments are often due on the last day of each month.

Quarterly Instalments for Eligible CCPCs

Some CCPCs can pay quarterly instead of monthly. CRA’s criteria typically relate to being a CCPC, having taxable income within the small business limit, and having taxable capital under the threshold.

A common quarterly pattern for a Dec 31 year-end is:

• Mar 31, 2026
• Jun 30, 2026
• Sep 30, 2026
• Dec 31, 2026

Tip: If your revenue is uneven throughout the year, a mid-year review of your instalment estimates can prevent a painful year-end surprise — and unnecessary interest charges. Setting those estimates and adjusting them as the year unfolds is exactly the forward-looking work our virtual CFO advisory handles month to month.

GST/HST Filing and Payment Deadlines

Even though this article focuses on corporate tax, most corporations also have GST/HST filing deadlines. Missing these creates a second set of penalties and interest. For a step-by-step walkthrough of making payments, see our guide: How to Pay HST Online in Canada.

General timing rules:

• Monthly filers: return due 1 month after each reporting period
• Quarterly filers: return due 1 month after each quarter
• Annual filers: return due 3 months after fiscal year-end (in many cases)

Payroll Remittance & Information Return Deadlines

If you have employees, you also have payroll deadlines.

• T4 and T5 information returns: due March 2, 2026 for the 2025 calendar year. February 28 falls on a Saturday in 2026, so the weekend rule moves the deadline to the next business day.
• Payroll remittance deadlines vary based on your remitter type and average monthly withholding amount (AMWA).

2026 Month-by-Month Corporate Tax Calendar

This calendar combines corporate tax instalments with common related deadlines so you can plan your year.

Penalties and Interest for Missing Deadlines

CRA penalties and interest are the main reasons these deadlines matter. See the CRA interest and penalties page for the full rules.

• Late filing penalty (first-time): 5% of the unpaid tax owing plus 1% per full month late, up to 12 months.
• Repeat late filing penalty: If you’ve been assessed a late-filing penalty in any of the three prior years, the penalty doubles — 10% of unpaid tax plus 2% per month, up to 20 months.
• Interest charges: apply to unpaid balances and compound daily at the CRA-prescribed rate.

Best practice: Even if you can’t pay in full, file on time. It eliminates the late-filing penalty entirely — you’ll only owe interest on the unpaid balance, which is far more manageable.

How to Request Penalty Relief from CRA

CRA has taxpayer relief provisions that may allow cancellation or waiver of penalties and interest in certain circumstances.

A practical approach:

1. File and pay as much as you can as soon as possible.
2. Gather evidence of the circumstances.
3. Submit a relief request through My Business Account (or the CRA process available to you).

Special Situations and Exceptions

Some corporations have extra complexity:

• New corporations: first-year filing can be confusing, but deadlines still apply.
• Short tax years: if you change your year-end, deadlines shift and instalment rules can change.
• Non-resident corporations: may have additional filing obligations.
• Not-for-profit organizations: can still have filing requirements depending on structure.
• Underused Housing Tax (UHT): may apply to certain corporations holding residential property.

If any of these apply, don’t rely on general rules alone — confirm your obligations early.

How to Stay on Top of Your Corporate Tax Deadlines in Canada

The easiest way to avoid missed deadlines is to build a simple system:

1. Use CRA My Business Account to monitor balances, due dates, and notices.
2. Set calendar reminders for instalments, GST/HST, and year-end tasks.
3. Close your books monthly so instalments match reality.
4. Work with a professional if you’re unsure — especially if you’re growing, hiring, or operating in multiple provinces.

Ready to Stop Scrambling for Deadlines?

Corporate tax compliance is mostly about timing. Two key points: your T2 filing deadline is usually 6 months after year-end, but your payment deadline is usually 2 months (or 3 months for eligible CCPCs). Factor in instalment due dates and it’s easy to see why businesses miss deadlines.

If you want help building a simple, audit-ready system — so you never scramble for a deadline again — our Tax Preparation service is built around exactly this kind of year-round compliance work. At Premium Bookkeeping & Accounting, we track filing deadlines, instalment schedules, and CRA notices for our clients so nothing slips through.

If your books aren’t current going into year-end, your accountant can’t do their job. Our Bookkeeping Services keep your records clean year-round — so your T2 is ready when it needs to be.

Get in touch with our team and let’s build a system that runs without you.