Was the lady referring to Thai baht being remitted to Thailand or euros that are remitted to a foreign currency deposit account in Thailand. If the money is remitted in foreign currency, I believe that you need to make a note of the exchange rate ( TT rate ?)at the close of business on the day the funds are received. For example, 5,000 euros and a rate of 40 baht per euro would be 200,000 baht. that would be the relevant figure for tax calculations irrespective of the exchange rate when you actually convert the euros to baht, which may be at a later date.