Notices of reassessment that were sent by registered mail by the Minister were returned by the post office, with the envelopes marked "unclaimed". After the period for reassessment expired, Revenue Canada sent out the notices of reassessment by ordinary mail with an explanation that the notices, when originally mailed, had been undeliverable "due to an address change". In fact, the taxpayer at all relevant times had been at the same address.
In these circumstances, Teskey J. found that "the onus is on the Minister to prove that the Notices were sent to the proper address", which he had failed to do. Accordingly, the taxpayer had not been reassessed within the period for doing so.