The High Court proceeded to apply the implied immunity of instrumentalities doctrine in a range of cases, many of which also involved taxation and were similarly controversial. In the case of
Deakin v Webb, decided later in 1904, the Court held that
Alfred Deakin was not liable to pay
Victorian income tax on his salary as a member of the
Australian House of Representatives, and as Attorney-General of Australia and later
Prime Minister of Australia, based on the principles in ''D'Emden v Pedder
. but in Baxter v Commissioners of Taxation (NSW)'', the High Court held that the Privy Council had decided the case without jurisdiction, and upheld the doctrine. settled the issue of state taxation by making all federal salaries subject to state taxes. In the
Railway Servants' case, the High Court held that the doctrine worked both ways, that is, it held that the states were also immune from Commonwealth laws, in finding that a trade union representing employees of the
Government of New South Wales could not be registered under federal
industrial relations legislation. The doctrine was challenged by the appointment of Higgins and
Isaac Isaacs to the High Court in 1906, and they regularly dissented from Griffith CJ, Barton and O'Connor JJ in implied immunities cases. The doctrine, along with the doctrine of reserved State powers, would ultimately be overturned in the Engineers' case of 1920. Writing in 1939,
H. V. Evatt (at the time a Justice of the High Court) discussed ''D'Emden v Pedder'' and the other implied immunity of instrumentalities cases and suggested that the High Court in the Engineers' case may have taken too drastic an approach to ''D'Emden''. The court in the Engineers' case did not overturn the result of ''D'Emden
since they would have arrived at the same result based on an application of section 109 of the Australian Constitution, which deals with inconsistency between state and federal legislation by specifying that the federal legislation will prevail. Evatt argued that the court had introduced a notion of supremacy which led to them misinterpreting the decision in D'Emden'', saying that Griffith CJ "regarded the rule... as one of mutual non-interference, and certainly not as perpetrating the absurdity of 'mutual supremacy'", that being the epithet with which the court in the Engineers' case had rejected any place for a doctrine of mutual immunity of instrumentalities. However, Evatt did concede that the Engineers' case showed that if any principle of immunity were to be revived, it "must have a far narrower operation in Australia than was first supposed by Griffith CJ"; indeed, it has been said that the principle as laid down in ''D'Emden
was of even broader application than that set out by Chief Justice Marshall in McCulloch v Maryland''. ==References==