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Social Insurance Number

The following comes from Page 54 of Revenue Canada Taxation publication MC42.

The Social Insurance Number contains nine digits. The number consists of eight assigned digits, with the ninth digit being constructed from the first eight and acting as a check digit. The accuracy of transcription of the number may be verified using the standard modulus 10 check digit formula.

Briefly, the check digit is established by considering the unit digit of the basic number and each alternate digit to the left to be a whole number. This number is multiplied by two and the digits in the product and the intervening digits which were not inflated are cross added. The sum is subtracted from the next highest number ending in zero. The difference is the check digit.

For the purpose of verifying the Social Insurance Number, you must consider the basic Social Insurance Number which consists of the first eight digits.