Deakin v Webb was one of a series of cases concerning whether the States could tax the income of a Commonwealth officer. The High Court of Australia overruled a decision of the Supreme Court of Victoria, holding that the States could not tax the income of a Commonwealth officer. This resulted in conflict with the Privy Council that was ultimately resolved by the passage of Commonwealth law in 1907 to permit the States to tax the income of a Commonwealth officer. The constitutional foundation of the decision was overturned by the subsequent decision of the High Court in the 1920 Engineers' Case.