You can strap your cash onto the back of a donkey and send him across into Thailand but it won't matter. Thailand has signed tax co-operating agreements with many countries that is already in effect. If you have a Singapore bank account, for example, your bank in Singapore will automatically report each year, how much money you earn in Singapore and your total assets in Singapore, and send this info to the Thai tax people. On top of that, Thailand will go cashless in the near future. More info stored on gov. computers. So for the ones now using their phone to pay for things, you are cutting your own throat.