Summary

Portrait of William O. Douglas William O. Douglas Robertson v. United States — Opinion of the Court

That history strongly suggests that the purpose was not to change the allowable period of allocation from one ending with the close of the taxable year to one covering any 36 months in the past when the work was done, but to prevent tax reduction by proration of income over a period of work greater than the duration of the work preceding the close of the taxable year.
Source: Wikisource

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