John Maynard Keynes? Dennis Gabor? Alan L. Mackay? Apocryphal? Anonymous?

Question for Quote Investigator: A cynical taxpayer crafted the following remark:
The avoidance of taxes is the only intellectual pursuit that still carries any reward.
This statement has been credited to the famous economist John Maynard Keynes, but I am skeptical because I have never seen a solid citation. Would you please explore this topic?
Reply from Quote Investigator: The earliest match located by QI appeared in the 1970 book “Innovations: Scientific, Technological, and Social” by Hungarian-British physicist Dennis Gabor. Boldface added to excerpts by QI:1
Even in Britain, where direct taxation has long reached the stage at which, as J. M. Keynes said ‘the avoidance of taxes is the only intellectual pursuit that still carries any award’ and where private households save now only 6 per cent of their income, direct taxation brings in only 40 per cent of the public revenue, which is 38 per cent of the G.N.P.
This version of the quotation used the word “award” instead of “reward”. The statement appeared more than two decades after the death of John Maynard Keynes in 1946. Also, Gabor did not present a citation for the remark. Thus, this evidence is weak.
Below are additional selected citations in chronological order.
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