FATCA requires financial institutions outside the United States to exchange information about their U.S. customers to the U.S. tax authority. In order for the relevant information to be exchanged at US Tax Authority (IRS), it is necessary for the Financial Institution to be registered at Ariadni portal. You can register here.
Further information can be found here
1. You will to register at the IRS and get a Global Intermediary Identification Number - GIIN
2. After, you will need to register at Cy Login. New user? Register here
3. Already a registered user? You will also need to authenticate your profile through your electronic banking system (eBanking) or by visiting a Citizen Service Centre (CSC) or a Citizen Center (KE.PO. - District Post Offices)
4. Have you been registered and authenticated? Please enroll in the system of the Tax Department here
Have you completed the above steps?