It is quite possible to do them yourself especially if your taxes are relatively simple - and in a lot of other countries you'll just be mailed a bill or credit

It is quite possible to do them yourself especially if your taxes are relatively simple - and in a lot of other countries you'll just be mailed a bill or credit depending on how much your withholding was along with a receipt to review if you think they messed up somehow. American and Canada are held hostage by tax software lobbyists though.