Path: utzoo!attcan!utgpu!tmsoft!mshiels
From: mshiels@tmsoft.uucp (Michael A. Shiels)
Newsgroups: can.general
Subject: Re: Re: SIN Number
Message-ID: <1989Jan6.024116.14949@tmsoft.uucp>
Date: 6 Jan 89 02:41:16 GMT
References: <1181@uwovax.uwo.ca>
Reply-To: mshiels@tmsoft.UUCP (Michael A. Shiels)
Organization: MaS Network Software and Consulting
Lines: 18

Here is the formula I know and use!

For example SIN 12345678x Where x is the checkdigit
You take the first, third, fifth, seventh digits and add them together.
Then you take 2*second and add the individual digits of the result and add them
to the sum. of the above.  Do the same with the fourth, sixth, and eighth digits
and you then take the last digit of this sum and when added to the check digit
'x' should end in a 0.  For example:

1+3+5+7=16
2*2=4->20
4*2=8->28
6*2=12->31
8*2=16->38

Therefore the check digit must be a 2.

It worked with mine and everyone I know.