The undertaking or scheme, if it is to fall within s. 26 (a), must be a scheme producing assessable income, not a capital gain. What criterion is to be applied to determine whether a single transaction produces assessable income rather than a capital accretion? It seems to their Lordships that an "undertaking or scheme" to produce this result must - at any rate where the transaction is one of acquisition and resale - exhibit features which give it the character of a business deal.
Later, their Lordships said [10] :
The final contention of the respondent is that the profit which arose to the appellant is income according to ordinary concepts, since it arose from an adventure in the nature of trade. Whilst this claim is quite independent of s. 26 (a) it seems to their Lordships to introduce no new element into the problem such as would lead to some different conclusion. The whole of the facts have still to be considered; the same criteria have to be applied; the question to be asked and answered is still whether the facts reveal a mere realization of capital, albeit in an enterprising way, or whether they justify a finding that the appellant went beyond this and engaged in a trade of dealing in land albeit on one occasion only.
In these passages their Lordships certainly appear to accept that the second limb of s. 26 (a) includes only profits which are income and that a capital gain is outside its scope. But if that were correct it would appear that the second limb of s. 26 (a) is entirely meaningless and ineffective. If a profit is income according to ordinary usages and concepts (which is no doubt what their Lordships meant by "assessable income" in the first of the passages cited) it is brought to tax by s. 25 without the assistance of s. 26 (a). The very aim of the second limb of s. 26 (a) was to bring "what might otherwise have been thought possibly to be capital profits within the conception of income" (Clowes v. Federal Commissioner of Taxation, per Dixon C.J. [11] ). I have already said that their Lordships cannot have intended to mean that the second limb of s. 26 (a) is entirely otiose: Federal Commissioner of Taxation v. Williams [12] . It is true that there are conflicting dicta on this matter. Since McClelland's Case some members of this Court have said, in accordance with the dicta in that case, that the second limb of s. 26 (a) applies only to profits of an income character: see Eisner v. Federal Commissioner of Taxation, per Walsh J. [13] and Burnside v. Federal Commissioner of Taxation, per Aickin J. [14] . Others have held expressly or by implication that s. 26 (a) extends to capital profits: see Steinberg v. Federal Commissioner of Taxation, per Barwick C.J. [15] ; Investment and Merchant Finance Corporation Ltd. v. Federal Commissioner of Taxation, per Menzies J. [16] ; and Burnside v. Federal Commissioner of Taxation, per Mason J. [17] . I do not understand any decision to depend upon the acceptance of either of the two views, although some of them do depend on the related, but distinct, proposition stated in the passages cited from McClelland's Case [18] , that the realization of a capital asset does not in itself yield a profit within s. 26 (a). In my respectful opinion, both limbs of s. 26 (a) are intended to include in the assessable income profits which would not be described as income in the ordinary sense, and would not be caught by s. 25. That intention would be defeated if the section were construed by reading into its words a limitation which they do not contain and which would restrict its operation to income within ordinary concepts. In other words, s. 26 (a) was intended to include receipts which would otherwise be regarded as capital, although it overlaps s. 25 to some extent and includes also receipts of an income character: see Reseck v. Federal Commissioner of Taxation [19] . In the present case therefore I do not consider that it is relevant to inquire whether the profit derived by the taxpayer was income within ordinary concepts for it was in any case profit within the meaning of s. 26 (a).
1. (1970) 120 C.L.R. 487, at p. 495.
2. (1970) 120 C.L.R., at pp. 495-496.
3. (1954) 91 C.L.R. 209, at p. 217.
4. (1972) 127 C.L.R. 226, at p. 250.
5. (1971) 45 A.L.J.R. 110, at p. 114.
6. (1977) 138 C.L.R. 23, at p. 47.
7. (1975) 134 C.L.R. 640, at pp. 687-688.
8. (1971) 125 C.L.R. 249, at p. 264.
9. (1977) 138 C.L.R., at p. 31.
10. (1970) 120 C.L.R. 487.
11. (1975) 133 C.L.R. 45, at pp. 47-48, 52-53.