Staying on top of tax deadlines is one of the most critical parts of running a successful business. Missing a key date can lead to penalties and interest from the Canada Revenue Agency (CRA), which can quickly eat into your profits. At Nunniyer Business, we believe that being prepared is the best strategy. We’ve put together this essential calendar of key Canadian tax deadlines for the 2026 calendar year to help you stay organized and on track.
Key Deadlines for All Businesses
February 28, 2026: T4, T4A, and T5 slips deadline. If you have employees or paid out dividends, you must file these slips with the CRA and provide them to your recipients by this date.
April 30, 2026: This is the deadline to pay your personal income tax balance owing for 2025. This applies to all Canadians, including self-employed individuals.
Deadlines for Sole Proprietors & Self-Employed Individuals
June 15, 2026: Filing deadline for your 2025 personal income tax return (T1). This deadline is extended for self-employed individuals, but remember, any tax owing was still due on April 30, 2026.
Deadlines for Corporations (T2)
Six Months After Your Fiscal Year-End: This is the deadline to file your corporate income tax return (T2). For example, if your corporation’s fiscal year-end is December 31, 2025, your T2 filing deadline is June 30, 2026.
Two Months After Your Fiscal Year-End: This is the deadline to pay your corporate tax balance owing. For Canadian-Controlled Private Corporations (CCPCs) that qualify for the small business deduction, this deadline is extended to three months after your fiscal year-end.
GST/HST Deadlines
GST/HST deadlines vary based on your filing frequency.
Annual Filers: Your GST/HST return is due three months after your fiscal year-end.
Quarterly Filers: Your GST/HST return is due one month after the end of each quarter.
Monthly Filers: Your GST/HST return is due one month after the end of each month.
Important Note: Even if you are an annual GST/HST filer and a sole proprietor with a December 31 year-end, your GST/HST payment is still due on April 30, even though your return filing deadline is June 15.
Tax Installment Payments
If you are required to pay taxes in installments, these are typically due quarterly.
For Individuals: March 15, June 15, September 15, and December 15.
For Corporations: Installment dates vary based on your fiscal year-end and remittance frequency, but they are generally due on the last day of each month or quarter.
Remember, these are general guidelines, and your specific deadlines may vary depending on your business’s structure and fiscal year-end. Keeping a calendar and tracking these dates is a crucial step toward proactive financial management.
If you ever feel overwhelmed by deadlines or want to ensure you’re compliant, the team at Nunniyer Business is here to help. We can manage your tax filings and keep you on track throughout the year.