There have been some updates surrounding the new system that replaces the TM6 called the Thailand Digital Arrival Card (TDAC).
We have compiled information surrounding the topic here:
[members only]
Official sources confirm that this system will become mandatory as of May 1, so you don't need to take any action immediately.
Simply remember to apply within three days before your travel date, as applications cannot be submitted earlier than that.
TLDR : Answer Summary
Starting May 1st, 2025, the new Thailand Digital Arrival Card (TDAC) will replace the TM6 form for all travelers entering Thailand. Applicants can submit their TDAC up to three days before their travel date, allowing for easier processing. However, there are concerns regarding how the system will work for those with retirement visas or multiple accommodation addresses, and some travelers are apprehensive about potential confusion during the implementation phase. The system aims to streamline the entry process but comes with challenges related to digital accessibility and hotel information requirements.
Thailand Digital Arrival Card (TDAC)