The US Dollar (US$) is the official currency. For local transactions, the Indonesian Rupiah (IDR) may be accepted in border areas, but this should not be relied on.
Timor island is before 1976 splitted into 2, the east part was colonized by Portugal, and on the west part the area of Indonesia, yet after 1998 a movement of east Timor independence supported by Australia and Portugal succeeded in giving suppression to Indonesian government to organize a memorandum of opinion, under the watch of UN which brought east Timor ( Timor l'Este ) into their independency.
The Democratic Republic of Timor Leste, more commonly known as East Timor, is an island country in Southeast Asia. The East Timor geography is quite interesting.