As the Indonesia Tax regulation no 36 year 2008, the interest from fix deposit should be deductible with WHT rate 20% , except to the subject as follows :
a. representative offices of foreign countries;
b. officials of diplomatic and consular or other officials of a foreign country and those who assisted them were working on and living together with them on condition that non-Indonesian citizens and in Indonesia they do not receive or earn income in the outside position or job and the country providing reciprocal treatment;
c. international organizations with the following requirements:
1. Indonesia became a member of the organization; and
2. Do not run a business or other activity to earn income from Indonesia in addition to lend to the government with funds derived from contributions of the members;