Two more things...review the TD1 and amend back for 10 years (carefully)

1) To review the personal tax credits, it's a really good idea to read the TD1 from top right to the bottom.See the five lines where the $2,000 (federal only) Family Caregiver Amount is added? Some provinces/territories may have added a similar credit and some haven't.

2) It's possible to apply back for ten years under the fairness provisions to request a re-assessment of your taxes to claim for missed credits. But keep in mind that you must come clean on any missed income claims, or over claiming of expenses in those years at the same time under the Civil Penalties rules.  There's a new form to assist with a claim for taxpayer relief called RC4288 Request for TaxPayer Relief and sometimes, opening up old years can result in tax payable, requiring a Voluntary Disclosure to be considered.