If your company is registered with the CSST in Québec, you will receive the « Décision de classification » in October from the CSST. (Date may change based on your province) In this communication, you will receive you rate for next year (starting January 2016).
For this 2016 rate to become effective, it must be entered under Edit Company Information (WCB/CSST tab) after having generated your last payroll of 2015 and before your first payroll of 2016.
Know that you can change your rate at any time through the WCB/CSST tab of Edit Company Information.