<h1>IndiGo faces a large GST demand over compensation treatment and denied input tax credit and will contest the orders.</h1> A revenue assessment imposed a substantial GST demand, interest and penalty relating to compensation from a foreign supplier and denial of input tax credit across multiple years, with an aggregate demand exceeding Rs 458 crore and a separate smaller penalty for another year; the airline will contest the orders through appeals, maintaining the positions are erroneous and supported by external tax advice and asserting no significant present financial or operational impact.