Section 3 For taxes collectible under this Revenue Code, a Royal Decree may be issued for the following purposes:
(1) to reduce or exempt tax as suitable to circumstances, nature of business, or local condition;
(2) to exempt tax to persons or international organizations under the commitment between Thailand and United Nations, under international laws, under Conventions, or under reciprocal basis;1
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(3) to exempt tax to government, state enterprise, Tessaban (municipal), Sukapiban (municipal), religious body or public charitable organization;the reduction or exemption under (1), (2) and (3) may be amended or revoked by issuing a Royal Decree.