FYI!!
Please make sure to fill out the TDAC form before entering Thailand.
Today (May 2) at Suvarnabhumi, they only asked me to show the passport and TDAC—nothing else was questioned. All they said was "Oh you hold DTV. Enjoy and don't forget to fill TDAC next time too."
If you haven’t filled it out online before reaching immigration, they’ll ask you to do it first. Quite a lot of people hadn’t completed the TDAC form. It seems like the line at the TDAC filling area is even longer than at immigration.
TLDR : Answer Summary
The TDAC (Thailand Digital Arrival Card) is essential for travelers entering Thailand, as demonstrated by a recent experience at Suvarnabhumi Airport where only the passport and TDAC were checked during immigration. It is advisable to complete the TDAC form online prior to arrival to avoid delays, as many travelers seem unprepared. The process is streamlined compared to the old paper forms, taking under five minutes to complete, and helps speed up immigration procedures.
Thailand Digital Arrival Card (TDAC)