It appears that, at one time, it was common to take no account of stock-in-trade or work in progress for income tax purposes; but long ago it became customary to take account of stock-in-trade, and for a simple reason. If the amount of stock-in-trade has increased materially during the year, then, in effect, sums which would have gone to swell the year's profits are represented at the end of the year by tangible assets, the extra stock-in-trade which they have been spent to buy; and similar reasoning will apply if the amount of stock-in-trade has decreased. So to omit stock-in-trade would give a false result. It then follows that some account must be taken of work in progress. Suppose that the manufacture of an article was completed near the end of an accounting period. If completed the day before that date, the article, if not already sold, has become stock-in-trade; if completed the day after that date it was still work in progress on that date. It could hardly be right to take that article into account in the former case but not in the latter. I do not know when it became customary to take into account work in progress, but it appears that that has been customary for many years, and it is not disputed that, at least in all ordinary cases, that must now be done [3] .
These propositions relate to "work in progress" as a synonym for tangible things, goods in process of manufacture from raw materials, things which when completed will become stock-in-trade. Accountancy theories differ as to the method of valuing such work. But "work" in that sense does not connote abstract activity, work done and labour expended. It denotes concrete tangible things, work on hand. But the ambiguity of the word "work" and the attraction for accountants of the phrase "work in progress" can I think mislead. In my opinion it is a mistake to suppose that the notion of the value of work in progress, in the sense of things uncompleted by a manufacturer or craftsman, can be simply transferred to uncompleted services by a tradesman or the practitioner of some profession, and to assume that it can there be applied in the calculation for taxation purposes, of income derived. I realize that in accountancy there is a similarity of a sort between unfinished goods and uncompleted services, and that the latter are sometimes described as work in progress. No doubt accounts can be kept in which a value is ascribed to uncompleted tasks by persons engaged in the practice of various trades and professions and rewarded by fees. Such accounts may be useful for many purposes, especially in the case of several persons practising a profession in association. The contribution of each to the earning of the collective income can be shewn by such accounts. And they may be useful in relation to the terms on which a partner retires from or a new partner enters a firm. But it is one thing to record when, and by whom, work is done which will produce income: it is another to say when income, the rewards of such work, was derived. I am aware that the expression work in progress has been used in some cases in arriving at the taxable income from fees for professional services: e.g., Wetton, Page & Co. v. Attwooll [1] . Nevertheless I think that services rendered for fees do not result in income derived within the meaning of the Act until the fees are either paid or payable. This of course may be before an account for payment is rendered. For example, a physician may be entitled in law to be paid for attendances upon his patient before his treatment of him for his illness has been completed and he has sent him a bill. What he is thus entitled to be paid forms part of his income calculated on an earnings basis; but not for work in progress, but for work done. Similarly an accountant engaged to conduct a continuous audit may be entitled to be paid for the hours he has spent and for his attendances, although he only asks to be paid periodically. But when a professional man is, according to the terms of his engagement, not to be paid until his task is completed, I do not think he can be said to have earned anything by that task until then. A lawyer retained to write an opinion or draw a deed cannot ordinarily say that he has earned any income by his work until he has produced the result of it. Similarly with an auditor employed to give a certificate, an architect to prepare plans, an accountant to produce a balance sheet. A half-written legal opinion, a deed drawn in part only, plans unfinished and still on the drawing board, an incomplete balance sheet, are not like goods in course of manufacture. When completed they are not valuable because of their physical properties, but for the information they convey or the legal effect they produce.
1. [1960] 1 W.L.R. 510; [1960] 2 All E.R. 110; [1961] 1 W.L.R. 739; [1961] 2 All E.R. 167.
2. [1961] 2 All E.R., at p. 171.
3. [1961] 2 All E.R., at p. 172.
4. [1963] 1 W.L.R. 114; [1963] 1 All E.R. 166.