Commissioner of State Revenue v ACN 005 057 349 Pty Ltd

The High Court of Australia heard appeals from the Court of Appeal of the Supreme Court of Victoria concerning land tax assessments. The dispute arose when the Commissioner of State Revenue (the appellant) detected an error in land tax assessments previously paid by ACN 005 057 349 Pty Ltd (the respondent), which resulted in an overpayment of tax by the respondent. Despite the detection of this error, the Commissioner did not amend the assessments or refund the excess tax paid.

The central legal issues before the High Court were whether the Commissioner was under a duty, compellable by mandamus, to amend the assessments and refund the excess land tax. The Court also considered whether the Commissioner's refusal to amend the assessments amounted to conscious maladministration, and whether the proceedings were barred under the relevant provisions of the *Land Tax Act 1958* (Vic).

The High Court allowed the appeals, setting aside the orders of the Court of Appeal. The Court reasoned that the statutory regime for objections and appeals under the *Land Tax Act*, along with the refund process outlined in section 90AA, indicated a clear legislative intention that the only mechanism for refunding overpaid tax was through section 90AA(2) and (3). The Court found that the Commissioner's conduct, even if based on a misunderstanding of the law, did not constitute conscious maladministration as he acted in good faith. Furthermore, the Court determined that the Commissioner was not mistaken in his understanding of the considerations relevant to the exercise of his discretion under section 19. The amended assessments were set aside, and the respondent was ordered to repay the overpaid amount to the appellant.