On 18th January the Catalan Authorities published that the payment procedure for the NOx tax had been approved through Law 12/2014 on 10th October. We had already anticipated the hightlights of this Law that came into force with effect 1st January 2015. Payment must be arranged between 1st and 20th February through the Generalitat de Cataluña website. We have also learnt that IATA is opposed to this tax and they are taking actions against the Catalan Government. A full explanation regarding its position can be found here.