Both the word "source" and the word "derived", have been the subject of observation and discussion in our own courts over a long period. A variety of cases has made it clear that the word "derived", in the context in which it is used in s. 23 (q), is not a term of art and that it may be treated as synonymous with "arising" or "accruing". (See for instance, Commissioner of Taxation v. Kirk [6] and per Barton J., in Harding v. Federal Commissioner of Taxation [7] .) And the "source" from which income of any particular description may be said to arise or accrue is a question of fact to be resolved by considerations of a practical nature. As was said in Nathan v. Federal Commissioner of Taxation [1] "the legislature in using the word "source" meant, not a legal concept, but something which a practical man would regard as a real source of income" [2] . Perhaps it is fair comment to say that these observations throw little light on the immediate problem of selecting one factor rather than another as indicative of the source of an employee's wages or salary. But I venture to think that practical considerations would lead one to conclude, for instance, that the source of a tradesman's wages is to be found in the place where he works whether as an employee or in the course of his own business. That is the place where he earns his living and in a very real and practical sense the source of his income is to be found in that place whether he is entitled to be paid there or elsewhere. Nor can I see any distinction in principle between such a case and the ordinary case of any employee, whether remunerated by wages or salary, when, pursuant to his contract of employment and in accordance with his master's requirements, he is required to earn his remuneration in some place other than that in which he was engaged or where his remuneration is payable. I do not, of course, mean to suggest that cases do not exist or may not arise where special circumstances will invest these latter factors with added weight and, perhaps, transform them into deciding factors. As Jordan C.J. observed in Commissioner of Taxation v. Cam & Sons Ltd. [3] : "Where income is derived from wages or salary, again the source has several factors. Personal exertion may be involved in negotiating and obtaining the contract of employment, in performing the stipulated services, and in obtaining payment for them. In the present instance, for example, in the case of all the men concerned, in a very real sense it may be said that the source of their wages consisted of the three elements of getting the job, doing it, and getting paid for it. Which of these factors is the most important element of the source in any given case depends upon the facts of that case" [4] . In that case the learned Chief Justice of the Supreme Court saw nothing special in the circumstances of the employment under consideration and treated the place where the employees' services were rendered as determining the territorial source of the wages paid in respect of those services. He said: "In the ordinary course of the employment of a seaman, such as is now under consideration, where there is nothing special, either in the circumstances of the contract of employment or in the payment, and where the work is both done and paid for in the ordinary course, the all-important factor is the doing of the work; and the contract of employment and the payment are relatively insignificant and formal elements. But this is not necessarily so with respect to all wages or salary. In the case of an appointment to a sinecure, the engagement and the payment may be the only significant factors. In the case now before us, the engagement and the payment took place, and part of the work was done, in New South Wales, but the bulk of it was done outside New South Wales. The source of the wages was thus partly within and partly without the State" [1] .