Each year I remind people that the T slips are due by the end of the February. If you had employees during 2018 you need to send the T4’s out to your employees and file with CRA by February 28th.
If your business is incorporated and you take dividends from this corporation then the same deadline applies. You must file a T5 by the end of the month with the shareholders and CRA. If you have paid subcontractors instead of employees, then you may have to file a T4A which is also due by the end of February.
February is only half over so there is still time for you to figure out if you have any T slips due by the end of the month.