- Yes you are correct, it will be treated as export of services and to export without payment of taxes he should apply for LUT before raising an invoice. GST registration will be required after crossing the threshold limit of Rs.20 lacs. Invoice may be raised in INR or foreign currency but the consideration should be received in foreign exchange and within 90 days from the date of invoice. He should collect FIRC from the authorised dealer. Invoice should be properly drafted. He can also claim refund of ITC on expenses related to the profession.