The widow of former Arkphire chairman Peter Monahan is challenging a tax decision on the shares she inherited from her husband in the High Court. Sheehan & Co solicitors lodged proceedings against the Revenue Commissioners on behalf of Anne Marie Monahan on July 15, court records show. Their submission includes the case stated in the dispute, which is the format required to challenge a decision by the Tax Appeals Commission (TAC). The legal action follows a TAC determination on March 3 that a €1.8 million capital gains tax (CGT) assessment issued by Revenue on the sale of company shares was…