Those were the only submissions made ultimately in counsel's closing address. But in the course of making them a third basis of assessment was discussed. This was that, as at the time when the sale took place, the consideration for which it was made should be valued and the amount of the valuation brought into the income for that year. Counsel did not contend that this was the appropriate method to be used in this case for computing the taxable income, but I think it is necessary to consider it because I think it is important that I should explain why it is that in my opinion the problem in this case is not to be solved by adopting a method, which at first sight might seem better designed than any other to establish what a seller of goods does really obtain in exchange for them, when he sells them at a price payable by instalments over a period. By evidence called on its behalf, the company sought to make out a case that its rights under the instalment contracts had no value or, at least, that it was not practicable to value them. Mr. Summerville, a manager of a large finance company, was called to say that his company does not buy traders' debts, nor do other finance companies, and that in his opinion it was almost impossible in a business sense to value book debts of this kind. This evidence was used in an endeavour to apply to this case certain authorities which were said to indicate that the method of valuation is proper if it is practicable but, if it is not, then debts should not be brought into account until the time for payment of them arrives: see Absalom v. Talbot [1] and Harrison v. John Cronk & Sons, Ltd. [2] . To those authorities I shall refer again later. But I do not think that the evidence of Mr. Summerville about valuing the debts is of any assistance in the circumstances of this case. If it should be accepted that if the debts were taken into the market for sale then probably no one would buy them, and that it is not possible to estimate in advance what would be the price paid for them if someone did buy them, this does not provide any basis for a conclusion that the debts had no value or had a minimal value to the company. It would be quite wrong in my opinion to conclude that the company engaged on a large scale in the business of selling on instalment contracts and favoured that form of trading, but was really exchanging its goods for something which had practically no value. We are concerned with the trading debts of a business which is not in the course of being wound up but is a going concern. If valuation is to be regarded as relevant to the problem, the valuation must be an estimate of what, at the time to which the valuation refers, the debts are worth to the company. I should think that this would have to be estimated by discounting the total face value of the debts to bring them to a present value and also by taking into account estimates as to the proportion of the debts which would be collected and of the losses which would probably be incurred by reason of default. Obviously it would not be practicable to value the debt created by each individual transaction. The valuing would have to be done according to a formula by which the face value of the debts was discounted to an extent which was calculated to be the proper extent, upon taking into account factors such as those to which I have referred. These factors are, of course, the same as those which it is natural to suppose that a businessman would consider when deciding the amount which in an instalment contract ought to be added as a terms charge component to the sale price of the goods. In this case it was not proved that if you applied such a method of valuation to the gross face value of the debts, the amount by which you would discount them would be the same as the amount of the terms charges, nor was it proved in my opinion that it would not be the same or approximately the same. It was suggested that the manner in which this company conducted its business was such that no assumption could be made that, in fixing the eleven per cent per annum used in computing the terms charges, the company paid any attention at all to what was needed to cover bad debts and collection costs and so on. I did not find this suggestion convincing. But in any event, there really was no proof that the amount of the terms charges was not adequate to cover those contingencies and to leave a reasonable return on the money outstanding on the sales. It is true that Professor Gynther, an expert witness called by the respondent, was disposed in parts of his evidence to suggest that in relation to instalment contracts an amount being a little less than the sale price component in the contracts might sometimes be the amount which in the accounts for the year in which the transactions were made would give a true reflection of the trading for that year. The suggestion was that it was proper to bring into the sales for the year the full amount of the sale price, but that there might be circumstances in which it would be right, also, to make and show in the accounts a provision for bad debts. But as I understood the evidence of this witness, he was not stating an opinion that in this case such a provision was necessary, in order that the true result of the year's trading should be shown, but was saying only that there might be cases in which such a provision ought to be made. But I need not review that part of his evidence in detail because, in the first place, I think that what he said on this point does nothing to qualify the other important evidence which he gave and to which I shall refer again and because, in the second place, counsel for the company has not made any submission that the challenged assessments should be reduced for the reason that what this witness said about bad debts shows that there should have been brought into the income of a particular year not the "sale prices" of the transaction but a slightly reduced figure designed to allow for bad debts. If such a submission had been made, it might have given rise to some problems as to whether effect could be given to it consistently with the provisions of the Act. The debts payable in the future could not be treated directly as bad debts or written off as such. But probably, if it were to be decided that the proper method of arriving at the income was one in which the debts were valued as at the date of the transactions, the provisions of the Act would not preclude the valuer from taking into account, when making his valuation, the risks as to bad debts. In my opinion however that question need not be pursued. It may perhaps be thought that for practical purposes the method adopted by the respondent, by which the trade debts created by the instalment contracts were treated by bringing the "sale price" immediately into account and by dealing separately with the terms charges, does not differ greatly from the result which would be attained by setting out to value, as at the date of the transactions, the rights vested in the company. But whether that be so or not, neither party has contended that it is this latter method which should be used in this case. The respondent's contention that the sale price should be brought to account in the year when the transaction takes place is based on the propositions that this accords with accepted accountancy principles applicable to trading of this kind, that it is necessary in order that a true picture may be obtained of the result of the year's trading and that what the Act requires is that the net gain of the trader in that year should be included in his income for the purposes of taxation. Those propositions are denied by the company. In place of them it puts forward the two contentions to which I have already referred and does not seek to support any third method of dealing with the problem as being a proper one to adopt in this case.