The CRA has a web page with helpful instructions on what to do if you get a phone call from someone puportedly from the CRA. It includes a phone number look up which you can use to check out the number which you were given to call back.

You can check out this page by clicking on this line.

Previously, the CRA required us to print the SIN completely on our documents.

The CRA has now issued directions that we are now to mask the first five digits of the SIN on documents, much like they do with their notices.

See here for details

Accordingly, over the next few days, as I print documents, I will be updating the print instructions to start masking the SIN on everything that I print.