The deadlines for corporate tax in Canada are not one-size-fits-all. The key difference is whether your corporation is a CCPC (Canadian-controlled private corporation) or not. That status can change when your corporate tax payment is due (2 months vs 3 months after year-end in some cases).
On top of that, your filing deadline and payment deadline are often different. Many corporations can file their return up to 6 months after year-end, but still must pay the balance owing much earlier. Instalments may also be required during the year.
The three corporate tax “clocks” to track
- T2 filing deadline (reporting).
- Tax payment deadline (balance-due day).
- Instalment payments during the year (if required).
Step 1: Know if you’re a CCPC (or not)
For many owner-managed businesses, the corporation is a CCPC. CCPC status matters because certain CCPCs may have an extra month to pay their corporate tax balance (3 months instead of 2).
What is a CCPC?
A CCPC is generally a private corporation that is resident in Canada and is not controlled (directly or indirectly) by non-residents or public corporations.
What is a non-CCPC?
If the corporation does not meet the CCPC conditions—common examples include a public corporation, or a private corporation controlled by non-residents or public corporations—it is treated as non-CCPC for many administrative rules. For due dates, the practical effect is that the balance-due day is usually 2 months after year-end.
T2 corporate tax return filing deadline
Most corporations must file their T2 return within 6 months after the end of their fiscal year.
How CRA counts the 6 months
If your tax year ends on the last day of a month, the filing due date is the last day of the sixth month after year-end. If your tax year ends mid-month, the due date is the same day number six months later.
Examples:
- Year-end December 31 → filing due June 30.
- Year-end September 23 → filing due March 23.
- Year-end October 2 → filing due April 2.
If your due date falls on a weekend or a public holiday recognized by CRA, the CRA generally treats it as on time if the return is received (or postmarked) on the next business day.
Corporate tax payment deadline (balance-due day)
The balance-due day is the deadline to pay any remaining corporate income tax owing for the year (after instalments and credits). This deadline is often earlier than the filing deadline.
General rule (most corporations)
Corporate income tax is generally due 2 months after the end of the tax year.
Extended balance-due day for some CCPCs (3 months)
Some CCPCs qualify for a 3-month balance-due day. In plain language, you usually need to be a CCPC throughout the year, be eligible for (and claim) the small business deduction in the current or previous year, and be within the small business limit rules (including associated corporations). If you are over the limit or part of a larger associated group, assume the 2-month rule unless confirmed otherwise.
Practical example (December 31 year-end):
- Most corporations: pay by February 28 (2 months after year-end).
- Eligible CCPCs: pay by March 31 (3 months after year-end).
Do you need to pay corporate tax instalments?
Many corporations must make instalment payments during the year (typically monthly). Instalments are partial payments toward the year’s total tax, and then you “true up” the remaining balance on the balance-due day.
Monthly vs quarterly instalments
Monthly instalments are the default. Eligible CCPCs may be able to pay quarterly instead of monthly.
How instalment due dates work
CRA calculates due dates based on the start of your corporate tax year:
- Monthly: first instalment is due one month less a day after the first day of the tax year; the rest are due on the same day each month.
- Quarterly: first instalment is due one quarter less a day after the first day of the tax year; the rest are due on the same day each quarter.
Example: If your tax year begins October 10, the first quarterly instalment is due January 9, then April 9, July 9, and October 9.
Common pitfalls (and how to avoid them)
- Mixing up filing vs payment deadlines. You can be “on time” filing and still late paying.
- Assuming every CCPC gets 3 months to pay. The 3-month rule is conditional.
- Forgetting instalments. If instalments are required, missing them can trigger interest even if you pay the year-end balance later.
- Not planning for associated corporations. Association can affect the small business limit and your eligibility for certain rules.
Summary table: corporate filing and payment deadlines
| Corporation type | T2 filing deadline | Tax payment deadline (balance-due day) | Instalments (if required) |
| CCPC | 6 months after fiscal year-end | Usually 2 months after year-end; may be 3 months if eligible (SBD + limits) | Monthly by default; eligible CCPCs may pay quarterly |
| Non-CCPC | 6 months after fiscal year-end | 2 months after year-end | Monthly by default; quarterly only if eligible |