to make and, if you have not sent them to us before, supporting documents for your original claim. The Canada Revenue Agency processes most adjustment requests received electronically within two weeks, and most of those received by mail within eight weeks. However, it may take longer if any of the following situations apply: Your request is submitted during those times of the year when we receive a higher volume of adjustment requests (late summer and fall). Your request is for a particular situation requiring further analysis or additional review. We need to contact you or your authorized representative for further information or documentation. When we complete our review of your adjustment request, we will send you a notice of reassessment showing any changes to your return and a letter of explanation if we did not accept the changes you requested or the changes were not required.