If you are not satisfied with the service you received or you disagree with the CRA, you have different options depending on the nature of your complaint.

If you are not satisfied with the service that you receive from CRA, see Submit service feedback.

If you believe that you have been subject to reprisal, see Reprisal Complaints. 

If you disagree with an assessment, determination, or decision, see File an objection – goods and services tax/harmonized sales tax (GST/HST).