If you no longer own the property, please forward the notice to the proper owner or return it to the Tax Office, indicating to whom the transfer of title has been made. To prevent misdirected tax bills, please advise the Tax Office in writing of mailing address changes. Failure to receive a tax bill could still result in penalty and interest charges of 1.25% per month applied to unpaid accounts. Send address changes to the City of Guelph, Tax Office, 1 Carden Street, Guelph, Ontario N1H 3A1.