Over the years I have helped many people to catch up on their taxes, in some cases going back the maximum allowable of ten years. Yes, you can file tax returns as far back as 10 years and they will be accepted by the CRA.
In many cases I have met people who had outstanding refunds waiting for them and had not filed for a variety of reasons.
In all cases the number one sentiment people tell me they experience once we have caught up on their tax filings is relief.
And don’t forget it is always better to come forward before you get the dreaded “demand letter” from the tax department. This allows you to potentially take advantage of the Voluntary Disclosure program offered by the CRA or perhaps the Fairness program if you have experienced a major personal disruption that has prevented you from filing your taxes.