Amounts which the corporation had failed to remit were evidenced by promissory notes issued to Revenue Canada to be paid on a deferred basis. MacKay rejected a submission that a failure to pay some of the amounts under the promissory note after a receiver-manager was appointed did not give rise to a liability under s. 227.1. He noted, at p. 6239, "that the liability of the directors arises at the time the corporation failed to remit the source deduction" and that "the promissory notes did not constitute a transaction separate from the liability of the plaintiffs under the Act". For similar reasons, he also rejected a submission that the plaintiffs were not liable in respect of a failure to remit that was not discovered until the time of a post-receivership audit by Revenue Canada.