Tax season carries real financial consequences for Edmontonians who miss key deadlines. The Canada Revenue Agency does not extend sympathy — it charges interest and penalties. The good news is that these dates are fixed, published, and completely avoidable with the right preparation.
Here are the five dates that matter most for 2026, and exactly what each one means for you.
- April 30, 2026 — Personal Tax Return Filing and Payment Deadline
This is the most important date on the calendar for most Canadians. April 30, 2026, is the deadline to file your 2025 personal income tax return and to pay any balance owing. These are two separate obligations that happen to share the same date.
If you file late and have a balance owing, the CRA charges a late-filing penalty of 5% of the balance owing, plus 1% for each complete month the return remains unfiled, up to a maximum of 12 months. Interest compounds daily on any unpaid balance starting May 1, 2026.
If you are expecting a refund and file late, there is no late-filing penalty — but your refund is delayed, and benefit or credit payments that depend on your filed return, such as the GST/HST credit, may also be affected.
Source: Canada Revenue Agency. Due dates and payment dates — Personal income tax. canada.ca
- June 15, 2026 — Self-Employed Filing Deadline
If you or your spouse or common-law partner are self-employed, the filing deadline for your 2025 return is June 15, 2026. This extension applies to both spouses as long as either one reports self-employment income.
The critical point that catches many self-employed Edmontonians off guard: the extended filing deadline does not extend the payment deadline. Any balance owing is still due on April 30, 2026. If you have a balance and do not pay it by April 30, interest starts accumulating on May 1 — regardless of whether you have filed yet.
The practical approach: estimate your balance owing before April 30, pay it, and then file by June 15.
Source: Canada Revenue Agency. Due dates and payment dates — Personal income tax. canada.ca
- Six Months After Fiscal Year-End — Corporate T2 Filing Deadline
If you operate through a corporation in Edmonton, your T2 Corporation Income Tax Return is due within six months of your fiscal year-end. For corporations with a December 31 fiscal year-end, this means the T2 is due June 30 of the following year. For a March 31 year-end, the deadline would be September 30.
The payment deadline is different — and earlier. For most Canadian-controlled private corporations (CCPCs) that have claimed the small business deduction, the balance owing is due two months after the fiscal year-end, not six. Missing that two-month payment deadline triggers interest charges even if you file the return on time.
Alberta’s corporate income tax return (AT1) is filed separately with the Government of Alberta’s Tax and Revenue Administration, also within six months of year-end.
Source: Canada Revenue Agency. Filing due dates for the T2 return. canada.ca; Government of Alberta. Corporate income tax. alberta.ca
- Last Day of February — T4 and T5 Slip Filing Deadline
If your corporation paid wages or salaries to employees in 2025, T4 slips must be issued to employees and filed with the CRA by the last day of February 2026. If your corporation paid dividends to shareholders, T5 slips follow the same deadline. There is no grace period. Penalties for late T4 or T5 filings are assessed per slip, per day, up to a maximum.
This is one of the most commonly missed payroll deadlines for owner-managed corporations, particularly those with only one or two employees. The February 28 date tends to arrive before business owners have fully recovered from calendar year-end.
Source: Canada Revenue Agency. Payroll — Filing T4 slips and summary. canada.ca
- Quarterly GST/HST Filing Deadlines
If your business is registered for GST and files quarterly returns, your reporting periods and due dates for 2026 are: Q1 (January 1 to March 31) due April 30; Q2 (April 1 to June 30) due July 31; Q3 (July 1 to September 30) due October 31; Q4 (October 1 to December 31) due January 31, 2027. The due date is one month after the end of the reporting period.
Annual GST filers have a different deadline — three months after the fiscal year-end for most registrants. Monthly filers have deadlines on the last day of the month following each reporting period.
Alberta has no provincial sales tax, so Alberta businesses collect only 5% GST, not an HST.
Source: Canada Revenue Agency. GST/HST filing and remittance deadlines. canada.ca
The Bottom Line
None of these deadlines are surprising or ambiguous — they are published by the CRA well in advance. What creates problems for Edmonton individuals and business owners is not ignorance of the dates but the organizational chaos of last-minute preparation. A CPA who knows your file can get you organized before the deadline, not after it.
Key Takeaway: Interest compounds daily. Penalties apply immediately. A single missed deadline costs more than a full year of professional accounting fees in many cases.
Nguyen Scott LLP serves individuals and businesses in Edmonton, St. Albert, Leduc, and Drayton Valley. Book your free 30-minute consultation at nsllp.ca/contact-us/
Ph. 780-458-5479.