Make sure you always use the correct name and social insurance number as shown on the recipient's SIN card.

If the employee does not give you his or her SIN, you should be able to show that you made a reasonable effort to get it. For example, if you contact an employee by mail to ask for his or her SIN, be sure to record the date of your request and keep a copy of any correspondence that relates to it. If you do not make a reasonable effort to get a SIN, you may be subject to a penalty of $100 for each failure. If you cannot obtain a SIN from the recipient, file your information return, without the SIN, no later than the last day of February. If you do not, you may be subject to a penalty.