The study of determinants of international reserves in Thailand employs the multiple
regression with ordinary least square to test the monthly data of international reserves (IR),
gross domestic product (GDP), propensity to import (PIM), trade balance (TB), external debt
(DEBT) and exchange rate (EXR) during 2000-2011. The study finds that DEBT and EXR
are statistically significant determinants of IR at 95% confident level and 99% confident level
consecutively. External debt positively relates to internal reserves because of precautionary
motive, especially, after the 1997 Asian financial crisis. Moreover, exchange rate (US$/Thai
Baht) positively determines internal reserves because an appreciation of Thai Baht leads to an
increase in import so that there will be an increase in international reserves. Government,
business and academic can apply these results accordingly.