Regarding the importation of foreign currency into Thailand
You can exchange money in Thailand, but there are various restrictions. We would like to suggest how to make you have less trouble exchanging money.
Recommended for tourists who want to bring dollars into Thailand. Now, money changers rarely accept old dollar bills like the 100-dollar bill made in 2006. Because there were a lot of counterfeit banknotes in that year. But there may be some exchange shops accepting money, but may offer a price lower than the new 100 bank price.
-US Dollars (USD) for 100, 50, 20, 10, and 5 banknotes for series before 1995 (the small head series). The adjusted rate is the exchange rate at the time of exchange reduced by 0.50 Thai Baht (50 Satang). This adjustment is valid from 14 July 2021 onwards. For another year 100 USD banknotes were in perfect condition. (no dirt, no folds, no marks, or no company stamp)
- The old series Qatar Riyal (QAR) banknotes are no longer accepted from 25 January 2021 onwards."
-Hong Kong Dollar (HKD) for 1000, 500, 100, 50, 20, and 10 banknotes issued between 1985-2002. The adjusted rate is the exchange rate at the time of exchange reduced by 0.15 Thai Baht (15 Satang).
For other countries' currencies, you can check the exchange price at any money changer.
- Swiss franc (CHF) for 1,000, 200, 100, 50, 20, 10. The adjusted rate is the exchange rate at the time of exchange reduced by 0.20 Thai Baht (20 Satang).
-Pound Sterling (GBP) for £50 and £20 (paper).
The adjusted rate is the exchange rate at the time of exchange reduced by 0.30 Thai Baht (30 Satang)
For other countries' currencies, you can check the exchange price at any money changer.
**Best exchange in Bangkok that give always best rate is superichthailand