There is, however, still another aspect in which the commissioner's case is presented. This final presentation of the case of the commissioner seems to me to depend upon the theory that after the ascertainment of the amount to which Welch had become entitled a payment of the full amount was notionally made by the defendant company and Welch accounting with one another. Reliance was placed upon the doctrine explained and illustrated by Callander v. Howard [1] . In that case the Court of Common Pleas held good a plea to an action on bills of exchange that the defendant and the plaintiff accounted together and an account was then stated between them of and concerning the causes of action and of and concerning certain other claims and demands of the plaintiff against the defendant and other claims and demands of the defendant against the plaintiff and on that accounting a certain sum named and no more was then found to be and was due and owing from the defendant to the plaintiff, which sum of money the defendant then in consideration of the premises promised the plaintiff to pay him on request and thereupon the defendant afterwards did so pay the plaintiff and the plaintiff accepted that sum. It may be doubted whether the plea was upheld as a plea of payment, although towards the close of the judgment it is said that in certain decided cases no satisfactory reason had been suggested why the plea should not be regarded as amounting to a plea of payment. Actual payment of a residue appears to be essential to such a plea if so regarded: see Callander v. Howard [1] , and Re Bayley-Worthington and Cohen's Contract [2] . In the course of the argument in Perry v. Attwood [3] , Lord Campbell C.J. said of Callander v. Howard [4] that it could hardly be a plea of payment: it did not show that what was claimed by the declaration had been paid. But if it did amount to payment it is what Lord Rolle described as a payment by way of retainer in the passage cited in Callander v. Howard [5] , and that is hardly the kind of payment s. 221C referred to. But be that as it may, I do not think that the facts of the present case make out such a state of affairs as would amount to the making of a payment after the end of either financial year or at the end of both financial years. In the first place, Welch was overdrawn. He was debited with the amount of his overdrawing and he appears to have paid a sum on account of that overdrawing. There is no evidence of an account between Welch and the defendant having been struck and a payment made in satisfaction of the balance. There was in this case no mutual extinguishment of cross-demands. If cross-liabilities in sums certain of equal amounts immediately payable are mutually extinguished by an agreed set-off, that amounts to payment for most common-law and statutory purposes. "Nothing is clearer than that if parties account with each other, and sums are stated to be due on one side, and sums to an equal amount due on the other side on that account, and those accounts are settled by both parties, it is exactly the same thing as if the sums due on both sides had been paid. Indeed, it is a general rule of law, that in every case where a transaction resolves itself into paying money by A. to B., and then handing it back again by B. to A., if the parties meet together and agree to set one demand against the other, they need not go through the form and ceremony of handing money backwards and forwards" (per Mellish L.J., Spargo's Case [1] ): see Commissioner of Stamp Duties (N.S.W.) v. Perpetual Trustee Co. Ltd. [1] ; Joseph v. Campbell [2] . But for the application of these principles there must be cross-liabilities and agreement, express, tacit or implied, and the cross-liabilities must be equal. If they are not equal payment of the residue must be effected by other means. A continuing account balanced at yearly intervals is not the same thing. The point is that there was no definite transaction amounting to payment which would form an occasion when the obligation to make deductions attached to the defendant company so that unless the deductions were then and there made, the company had failed to make a deduction required by Div. 2 within the meaning of s. 221E; in other words, there was no "time of making payment" within s. 221C (1). No doubt if Welch had sued the defendant company, for example, in 1945, to recover salary for either or both of the two financial years in question, the company could have made out a complete defence to the action under a plea of payment. But that would be because the implications involved in Welch's drawings in advance of the liability bound him to apply the advances in satisfaction of the liability when and if it was ascertained and due and in fact his drawings exceeded the amount so ascertained. But such a situation was the result of a course of dealing which included no specific occasion or occasions upon which the liability to deduct prescribed amounts fell upon the defendant company. Section 221C appears to be directed to the making of deductions from sums of money paid over and not to the discharge of an obligation for salary or wages by other means. It is not necessary in the present case to decide what would have been the operation of s. 221C if an employee had been found to owe his employer a large sum of money upon some extraneous transaction and an agreement between them was made, treating the obligation to pay him wages as operating in discharge of his liability pro tanto or entirely. Perhaps this would be considered a "time of making payment" within s. 221C (1) and the employer could not bring in the wages to extinguish pro tanto the cross-obligation without reducing the amount of the wages by the prescribed deduction. But in the present case the drawings were advances on account of wages and were applicable in satisfaction of wages independently of the employer. They were debited against Welch either in the ledger account or the loan account as the case might be and the account ran on until finally at the end of 1945 drawings ceased apparently, leaving him a debtor to the company in £298. It is true that the figures are balanced at the end of every year, but that is not enough to bring the case within the principle relied upon. There was no definite transaction after the remuneration was ascertained amounting to payment, and as such affording a specific occasion for the making of the deductions at the rates prescribed. The result may be thought to show that the legislature failed to cover all the possible contingencies occurring within the scope of its general policy. But it is to be remembered that s. 221C in its then form was found to be misconceived and inadequate and that it is for that reason that the legislation upon which this decision depends is no longer in force, s. 221C having been re-cast.