dougness wrote:Hello,I have a question.Is it true that if a Thai buys a property,they must hold it for five years or pay a hefty government tax?My wife tells me this,is she lying?

There is a business tax of 0.11% levied against an owner who has been in registered possession of the property less than 5 years.
In addition to that there is also income tax 1-3%, but that is not time related. It can be part of bargaining process to accept pay that income tax instead of the seller.
Selling condonium there is a business tax 3,3% if property has not been owned 5 years. So this is not a simple answer, because tax rate varies if property is land or condo.