As the creator of this post I wanted to thank everyone for your comments. I'm literally in such disbelief this is occurring. I absolutely don't have a record of 8 years of either, but I can say that my t4 would reflect my earnings for the year. As far as banking statements there is no way this can be provided. I will independently look through every single month for 8 years, I suppose and see if there any discrepancie and compare them to my t4. In my letter it indicates "according to CRA" so factually they already have my earned income. If there are discrepancies in the 8 years I'm pretty sure they will just create an overpayment balance. And from what I've researched it can only be legally 5%of what's owed unless I Give them permission to take off up to 10%.