This also depends on how your lender operates but it is possible that your deferred mortgage payments will have a negative impact on your credit score if they are not properly reported to Canada’s credit bureaus.  For instance, both Equifax and TransUnion have automated systems that might simply label a deferred payment as a late one, which would normally stay on your credit report for several years and gradually decrease your score. This is just one reason why it’s essential to check your credit every few months.