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Answereda year ago

What should I know about filling out the TDAC for Thailand?

THIM and TDAC notice
Need a clearer THIM and TDAC explanation? Read the THIM guide on thim.in.th.
Richard ******
asked Oct 20, 2025
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Need some help with the TDAC. Trying to get it all filled in ahead of time then update again before we leave in that three day window. The problem I am having it keeps telling me my arrival date is invalid. Is this because we have not entered that 3 day window and I can not do it before then?

Also, I never got to the 3rd part which says health declaration??? What will I need to complete that part?

Thank you all in advance for any and all responses.
Answer summary
When filling out the TDAC for your arrival in Thailand, it's important to note that you can only submit your arrival date within a 3-day window before your departure. Attempts to enter a date beyond this window will trigger an invalid date error. You should update your TDAC daily within this period until your arrival date is accepted. Additionally, the health declaration is only necessary if you have visited another country within the last two weeks prior to arriving in Thailand. Remember, only fields marked with an asterisk (*) are required to be filled out.
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Bob **********
Bob **********
Yes just wait it a simple form
Richard ******
Richard ******
OP
Thank you everyone for responding. I very much appreciate it. ๐Ÿ˜Š
Alan ********
Alan ********
@Richard *****
don't worry. It's OK unfortunately not everyone has a phone or a phone that does anything smart. So when you get to Bangkok look for the service before immigration and they will print you a paper copy. Ask a kind Thai airport staff though ๐Ÿ™‚๐Ÿ™‚๐Ÿ™‚. Better still when you check in some airlines will do it for you but go early enough before the ques start
Mike ************
Mike ************
I know how you feel. I was the same before the first time I filled out the TDAC.

Health Declaration only refers to if you spent time in another country before coming to Thailand.

You will be okay with TDAC
THAI ******************************
THAI ******************************
We support early submission here and edits:

*******************************


But please note there is a $8 fee if submitting earlier than the 72 hour window, otherwise it's 100% free.
Lynnette *******
Lynnette *******
Why are you trying to fill it in outside of the 72 maximum? It clearly says not before 72 hours. It's a few minutes task with very little to fill in on it. You can even do it in the airport, the plane or on arrival.
Michael *****************************
Michael *****************************
Who will help you to the airport ?
11
Leigh *****
Leigh *****
@Michael ****************************
you can do tdac at airport in bkk whe arrival but huge queues to do it
Michael *****************************
Michael *****************************
Andrew ******
Andrew ******
@Leigh ****
Leigh mr 4 names was being a smart arse originally. Don't bother with DH
Leigh *****
Leigh *****
@Michael ****************************
they have machines you can do the tdac on jyst before immigration
Graeme ******
Graeme ******
Remember you only need to fill in where you see the * all other areas and not required
Graham ******
Graham ******
Put in a date within 3 days then update it daily until you get your arrival date accepted. You only look at the health part if you have been in a different country from where you are departing from within the last 2 weeks.
Graeme ******
Graeme ******
Unfortunately you can't fill it in earlier than the 3 days before you arrive
Brandon ************
Brandon ************
It will not accept a date that is greater than 3 days away.

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