2. When you leave the country:
» Before entering the international zone of the airport (before going through the scanner) go to the Customs office.
Show the yellow forms P.P.10 and the goods purchased (they can inspect all of them, especially luxury ones) to obtain the Customs stamp.
Without the stamp, VAT refund will not be possible.
» After passing through the immigration checkpoint, with P.P.10 forms stamped and with luxury items on hand (if any), go to the VAT refund office to recover the tax money.
Luxury items (jewellery, gold ornaments, watches, glasses or pens whose value exceeds 10,000 baht) must be taken by hand to be re-inspected at the VAT Refund Office.
For further details click here.