Article 4

1. Within the scope of its official activities the Organisation and its property and income shall be exempt from all direct taxes.

2. Where substantial purchases for the exercise of its official activities, and in the price of which taxes or duties are included, are made by the Organisation, appropriate measures shall, whenever possible, be taken by the Contracting States to remit or reimburse to the Organisation the amount of such taxes or duties.

3. No exemption shall be accorded in respect of duties and taxes which are no more than charges for public utility services.