The requirement comes from section 19(5) of the Condominium Act, which lets a foreigner own a unit on condition that the purchase money was brought into Thailand as foreign currency. Banks issue the form for an inward transfer of USD 50,000 or more. Below that, the bank provides a credit advice or confirmation letter, which the land office also accepts. The form was previously known as a Tor Tor 3.

Three details decide whether the paperwork works:

  • Send foreign currency, and let the receiving Thai bank convert it to baht. A transfer converted before it arrives does not qualify.
  • State the purpose in the transfer instruction, naming the condominium and unit.
  • Make sure the sender's name matches the buyer's name on the contract.

The documents together should cover the full price. Keep the originals: you will need them to send the proceeds abroad when you sell. Bank practice varies, so ask the receiving bank what it needs before you transfer. See sending money to Thailand and selling property and repatriating funds.