The Mauritius Revenue Authority (MRA) has set up a mechanism to enable taxpayers to retrieve their User ID using their National Identity Card Number and their password for eFiling.
(i) Where the employee is a Mauritian Citizen, the NIC number should be used, and
(ii) Where the employee is a not a citizen of Mauritius, the identification number issued by the Passport and Immigration Office(PIO); or any other identification number issued by the Director General should be used.
This facility is available only for Individual Income Tax Return

Enter NID or NCID to retrieve your Tax Account Number (User ID): *