An ATA Carnet is an international import-export customs document. Commonly known as Merchandise Passport or Passport for Goods, carnets simplify the customs process and exempt you from paying duties and taxes on temporary import-exports. Carnets last up to 12 months and cannot be extended, but may be re-applied for. They do not exempt you from obtaining necessary permits and licenses.
There are two types of ATA Carnets, The ATA Carnet Company applies to 84 countries and territories worldwide, while the TECRO/AIT Carnet applies only to Taiwan. They both function similarly, and an ATA Carnet may also accompany merchandise that passes through other countries in addition to Taiwan.