You may enter Thailand with personal belongs of a reasonable amount up to the value of 10,000 baht (around $300). Two hundred cigarettes (or 250 grams of tobacco or cigars) and 1 liter of alcoholic drink may be brought in duty free. Anything over and above this must be declared and will be subject to a duty charge.
Restricted goods may not be imported or exported unless you are in possession of a permit from the relevant Thai government department. Thai customs list these as: Buddha images, religious or ancient artifacts and antiques; firearms and ammunition, including explosive items and fireworks; plants and seeds; live animals, pets and animal products; automobiles and spare parts; food and medical supplies; alcoholic beverages, cigars and cigarettes over the duty-free limit; wireless transmitters and receivers, including radio equipment.
Prohibited goods may not be imported to or exported from Thailand. Penalties for importing prohibited goods can range from fines and imprisonment, to the death penalty in the case of importing narcotics. Listed prohibited goods include: narcotics; obscene items or publications; counterfeit or pirated goods; counterfeit currency; and protected wildlife.
Imports for which it can be proven the goods are for exhibition, scientific purpose or samples and will be re-exported can be imported temporarily. Importers must show the ATA Carnet (merchandise passport) listing the goods on departure, otherwise customs charges and duties will be incurred.
With Thai currency, any amounts of more than 50,000 baht must be declared to customs unless you are traveling to Laos, Myanmar (Burma), Cambodia, Malaysia or Vietnam--for these destinations the limit is 500,000 baht. For foreign currency, any amount over US$20,000 or its equivalent in or out of Thailand must be declared.
