All visa rerequirements are available at:
Visa information Goverment Page
Arriving via Air: There is no need to obtain a visa before arriving in Timor-Leste. Upon arrival, tourists are issued a 30-day travel permit and charged US$30 for it. The stay period can be extended to a maximum of 90 days. Each subsequent extension will cost US$45. Travellers departing from here are required to pay a departing tax of US$10. Do be prepared with the right currency as there are no facilities for money exchange at the airport.
Arriving Via Land: Except for Indonesian nationals and Portuguese nationals, all travellers arriving at a land border post must apply in advance for a “Visa Application Authorization”. When the traveller arrives at the border, the “Visa Application Authorization” must be presented to an immigration official. Then, if the traveller meets the other requirements the visa may be granted on payment of US$30. Travellers applying in advance may be granted a visa valid for up to 90 days stay, which can be valid for single or multiple entries.
Short stay entry visa is waived for Portuguese passport holders.
Those who apply for a work visa need to furnish proof of employment. Business persons can apply for resident visas by providing proof that validates the registration of their business.
Note: It is recommended that you check the latest visa and passport requirements with your embassy before planning a trip to Timor. These rules are subject to changes very often.
US citizens that need to renew, add pages, change name, or just get a new US passport, can Apply for a New US Passport here.