Tax Deadlines in Canada: What Every Business Owner Should Know

Missing tax deadlines in Canada can result in penalties, interest charges, and unnecessary stress. As a business owner, knowing the key dates throughout the year is essential for staying compliant and avoiding costly mistakes.

January 15 is the deadline for the final quarterly GST/HST instalment for the previous year. It's also when employers should begin preparing T4, T4A, and T5 slips for the previous calendar year.

February 28 (or 29 in a leap year) is the deadline for filing T4 and T5 information returns with the CRA and distributing copies to employees and recipients. Late filing results in penalties of $25 per day, up to a maximum of $2,500.

March 1 is the deadline for RRSP contributions that will be deducted on the previous year's personal tax return. While this is a personal deadline, it's critical for business owners who use RRSPs as part of their tax planning strategy.

March 31 is the filing deadline for T3 trust returns and the deadline for filing partnership information returns (T5013).

April 30 is the personal income tax filing deadline for most Canadians and the payment deadline for any balance owing — including self-employed individuals. Even though self-employed filers have until June 15 to file, any taxes owed are still due by April 30.

June 15 is the filing deadline for self-employed individuals and their spouses or common-law partners. Remember, this is a filing deadline only — payment was due April 30.

Corporate tax returns are due six months after the fiscal year-end. For example, if your corporation's year-end is December 31, the T2 return is due June 30. Corporate tax payments, however, are generally due in monthly instalments throughout the year.

GST/HST filing deadlines depend on your reporting period — monthly, quarterly, or annually. Annual filers must file within three months of their fiscal year-end. Missing GST/HST deadlines triggers automatic penalties and interest.

Payroll remittances are due on the 15th of the month following the pay period. The CRA takes payroll compliance very seriously, and penalties for late or insufficient remittances can be severe.

Create a tax calendar at the beginning of each year with all your filing and payment deadlines. Better yet, work with an accountant who proactively manages these deadlines on your behalf.