The CRA doesn’t provide a way of transmitting a PO Box or RR number through NETFILE, so we don’t ask for this information. If you’d like, you can enter your PO Box and your RR number in the Street number and name field.
The CRA will use the address information they already have for you on file. They will not update your mailing address based on what you enter on your return. If your address has changed, you need to contact the CRA before you file your return.