Article 201 empowers the Chairman to manage two critical administrative systems. First, he decides the specific date for launching the unified Tax Card system (per Article 11). Second, he is authorized to establish rules for issuing 'Tax Residence Certificates'. These certificates are vital for Omani persons and companies seeking to benefit from international tax treaties (DTAAs) abroad. By formally establishing residency certificate procedures, Oman supports its domestic entities in claiming treaty benefits (like reduced withholding rates) in other countries, facilitating the global expansion of Omani businesses.