Your client’s unused RRSP contribution room is $46,000.

Unused RRSP contribution room can be carried forward indefinitely. The carry-forward amount is the unused room minus the current year’s contribution: $46,000 - $15,000 = $31,000. The feedback from the document states:

"Any RRSP contribution room that is not used in a taxation year can be carried forward to be used in future years. There is no limit on the amount that can be carried forward. In this example, $46,000 - $15,000 = $31,000."