How to link your Social Insurance Number (“SIN”) to your Business Number (“BN”)

OPTION 1: CALL CRA
To update the information right away, you will have to call CRA at 1-800-959-5525 (within Canada and the United States) or at 613-940-8497 (from outside Canada and the United States), choose option 6 and update information with the CRA agent. CRA will ask you confidentiality questions. These are the questions that CRA normally asks:

a) The business number and full legal name of the business
b) Business address
c) Information regarding recent tax return filed. (For T2 returns, they usually ask amounts
on line 300, line 700 and line 770)
d) If the business hasn’t filed any tax return yet, CRA will usually ask questions regarding the
business’ incorporation (i.e., date of incorporation, jurisdiction of the corporation and
corporation number)

OPTION 2: SUBMIT A WRITTEN REQUEST
Alternatively, we can send a written request to the tax centre (please note that sending a written request
could take up to 2-4 weeks to be processed). The letter should be signed and dated by the owner and
must have the following information:

a) Business name and business number (We can send one letter for all the business accounts
owned by the same individual)
b) SIN, date of birth, address, and phone number