@Mickael *******

Yes, as I said 180 days and over per calendar year. I don't think Thailand needs you to prove you brought cash as soon as you declare it yourself. Is that a requirement from your country?

@Hans-Georg *****

Inventing your own laws or what? 😂 That's not how things are working when you spend over 180 days in Thailand per calendar year. Various scenarios for which you may or not pay taxes but saying "tourists" aren't paying taxes is wrong. Yes for "tourists" who spend less than 180 days.

You may need to remit a good amount of cash and make sure you're considered as a fiscal resident here in Thailand (by spending over 180 days per calendar year here). Not sure if you qualify for this year (as per declaration deadline) but next one should be fine.

As for paying for taxes, you can do so directly at the nearest Revenue Department Office, with Truemoney or at some banks.