results: or (2) that, when the taxpayer has once adopted one
method, he must go on for ever following the same method unless
(possibly) the commissioner consents to the adoption of the other
method. There are several objections to this second proposition.
In the first place, the Act does not, as I read it, permit of the intro-
duction of such a principle either generally or in the case of profes-
sional men. Separate returns are made for each year. It has
never yet been decided that the making of a return upon a particular
basis for one year either entitles or binds the taxpayer to continue
to make returns on the same basis for subsequent years. There are
many decisions in this court in which the court has held that a
long-continued practice was wrong simply because it was contrary
to the terms of a taxation Act. The adoption of any other view
would involve the result that the meaning (not merely the result
of the application) of the Act in any particular case might vary
according to the practice of the particular taxpayer concerned if
that practice had not been challenged by the taxation authorities
upon its initiation. Further, for reasons already stated, the commis-
sioner cannot "consent" to any practice if that practice is incon-
sistent with the Act. The Act contains a number of provisions
which enable the commissioner to determine certain questions - for
example, secs. 6 (4), 8, 9, 22 (xiv a), 22 a, 22 B, 23, 24 and other
sections. If he exercises such powers and in a particular case accepts
the view or contention of a taxpayer, he may be said to have given
a "consent " which is effective. But it is effective, not as a consent,
but as a decision ; and it is effective only by reason of the express
terms of the statute. If there is an imperative provision in the
statute, the commissioner is bound to obey it, and he cannot, by
any process of consent, in effect repeal it in the case of any taxpayer.
If, upon the true construction of the Act, a professional man is
bound to declare his profits and gains upon an earning basis, the
fact that he has, in the past, declared them upon a receipts basis
is irrelevant in relation to any return which is within any time limit
permitted by the Act for reconsideration or re-assessment.