Good-bye ETA (Electronic Travel Authorisation)
Hello TDAC (Thai Digital Arrival Card), including the collection of the the tourist tax from travellers who fall into one of the — yet to be defined and announced — categories subject to this tax.
Excerpt from the news article TDAC system will replace TM.6 paper form, reducing immigration processing times and improving efficiency in The Nation (highlighting in bold is mine):
There we have it, an elegant solution to collect the tourist tax.
No details of the process are available yet, but I think it will be akin to the eVisa application. Digital arrival card is a misnomer, it is really a travel authorisation.
Fill out and submit the online form a specified minimum number of days before departure.
If applicable, pay the tourist tax online as the final step of the online submission of the form.
Get the TDAC, with a QR code or whatever, by email and print it out.
Present the TDAC at check-in. No TDAC, no boarding pass, simple as that. This requirement will have to be included in the IATA rules. On arrival in Thailand, hand over the passport, TDAC and eVisa, if applicable, to the immigration official.
All we can do now is hold our breath and wait to see how this will play out.