A new 20 is coming in March.

The 20-baht polymer banknotes maintain the same theme of design and features as the current 20-baht paper banknotes in circulation. Advanced anti-counterfeit technologies ensure that the new polymer banknotes are difficult to counterfeit. The additional, new security feature is the clear window. The lower clear window exhibits color-shifting ink that shifts from translucent yellow to red. For the visually impaired, the small numeric "20" is embossed in the clear window, which can be easily touched and felt.
The new 20-baht polymer banknote is printed by De La Rue plc on both CCL Secure's Guardian™ substrate and De La Rue's SAFEGUARD® polymer substrate.

Previously, the Bank of Thailand had issued two circulating 50-baht and one 500-baht commemorative polymer banknote. The bank discontinued use of polymer, but due to current, advanced technology, the print quality and durability are much better than before. It is planned to switch the other denominations to polymer as well.