The Malaysian Bar seeks to help the Federal Court in its hearing of appeals by former prime minister Najib Abdul Razak and his son Mohd Nazifuddin over tax-related rulings against the duo.

The Bar cites as a reason the potential impact of the apex court’s ruling could have on all taxpayers in Malaysia, especially on the issue of whether courts are compelled by law to disregard taxpayers’ defence against tax-recovery suits by the Inland Revenue Board (IRB).

According to a copy of the Bar’s letter to the secretariat of the chief justice dated yesterday, the lawyer’s group is...