Travel Guide
Thailand Digital Arrival Card in 2026: When to Submit TDAC and What to Prepare
If you are flying to Thailand in 2026, one of the easiest ways to create avoidable stress is to leave the Thailand Digital Arrival Card until the last minute without understanding...
ByMomentBook EditorialPublished
If you are flying to Thailand in 2026, one of the easiest ways to create avoidable stress is to leave the Thailand Digital Arrival Card until the last minute without understanding what it is for. Many travellers still think of arrival cards as something handed out on the plane. TDAC changes that routine by moving the process online.
The good news is that the official system is not difficult. The confusing part is usually the timing, the exception rules, and the difference between TDAC and a visa. A reliable guide therefore needs to answer the practical questions travellers actually have: who must submit it, when the submission window opens, what details to prepare, what happens if plans change, and what to do if you arrive without easy mobile access.
What to know first
- TDAC is the Thailand Digital Arrival Card, an online form that replaces the old paper arrival card.
- All non-Thai nationals entering Thailand by air, land, or sea are required to submit it before entry.
- The official FAQ says you can submit within 3 days before arrival, including the arrival date, or up to 72 hours before entry.
- TDAC is not a visa.
- TDAC is valid for one entry only, so you need a new submission every time you enter Thailand.
- Transit that does not pass through immigration does not require TDAC.
*Image source: Wikimedia Commons*
What TDAC is and who must submit it
The official user guide defines TDAC as the Thailand Digital Arrival Card, an online form designed to replace the traditional paper-based arrival card. That means it sits in the arrival-reporting part of the trip, not in the visa category.
The core rule is broad and simple. The official guide says all non-Thai nationals entering the Kingdom of Thailand are required to complete TDAC online prior to entry. The FAQ repeats the same point and makes clear that this applies whether you are entering by:
- air
- land
- sea
This is the first place where travellers often overcomplicate the issue. If you are a foreign national entering Thailand, the default assumption should be that TDAC applies to you. The next step is then to check whether your specific travel pattern falls into one of the official exceptions.
The guide is also explicit that TDAC is not a visa. That distinction matters because travellers may also be entering under visa-exempt rules, visa on arrival, or another visa type. The official FAQ says TDAC is compatible with all visa types, including visa-on-arrival and visa-exempt entries. In other words, TDAC does not replace those systems. It sits alongside them.
When to submit and what to prepare
The timing rule is one of the most important details in the whole process. The official FAQ says the card should be submitted within 3 days before arriving in Thailand, including the date of arrival. It also says the form can be submitted up to 72 hours before entry.
That means the practical window is short. Too early is not useful, and too late creates airport risk.
Before you start, the official guide says you should prepare:
- passport information
- personal information
- travel information
- accommodation information in Thailand
- health declaration information
- an email address to receive the TDAC
The official submission steps also show that the system uses your email to deliver the card and QR code. So even if you are comfortable doing everything on your phone, email access still matters.
Another practical point from the guide is that all details must be entered in English. If you are copying accommodation details from a reservation or pulling flight details from an airline app, this is a good moment to keep the exact English-format version ready before you start.
Transit, children, and group travel
Not every airport stop in Thailand creates a TDAC requirement. The official FAQ says transit flights and technical landings do not require TDAC if you are not passing through immigration. That is an important line because travellers often assume that any stop on Thai soil automatically triggers the form.
But the rule changes as soon as you actually enter. The FAQ also says that if you leave the airport, TDAC is required. So the real dividing line is not "air transit" in the abstract. The real dividing line is whether you pass immigration.
The same FAQ also answers two family and group questions clearly:
- infants and children need TDAC too
- group submission supports up to 10 travellers in one submission
This is helpful for families because it removes guesswork. You do not need to invent a child exception that is not there. If a child is travelling into Thailand, the child needs TDAC.
For larger groups, the official guide and FAQ both support combined submission, but only up to 10 travellers at a time. If your group is bigger, you should plan for multiple submissions instead of assuming one batch can cover everyone.
How corrections work and when to submit a new form
One strong feature of the official system is that TDAC information can be updated before travel. The user guide says travellers can update the submitted information any time before departure, and the FAQ explains that the most recently updated valid entry is what the system will consider.
That said, not every field should be treated as casually editable. The official FAQ says that if the information you want to change cannot be updated, the safest response is to submit a new form with the correct details. It also notes that only the most recent valid submission will be used.
The practical lesson is this:
- minor trip updates can be handled through the update function when supported
- core identity information should be entered carefully the first time
- if one of the non-editable fields is wrong, a fresh submission is safer than hoping staff will ignore it
This is especially important for travellers completing the form in a hurry on a phone. A rushed typo in identity information is not the same kind of mistake as changing a hotel address.
Arrival-day backup options and how to avoid the wrong website
Travellers sometimes worry that everything will fall apart if they arrive without mobile service or if the website gives an error. The official FAQ offers some reassurance here. It says kiosks and Wi-Fi support are available on arrival, and it lists kiosk installation points at five airports:
- Suvarnabhumi
- Don Mueang
- Phuket
- Chiang Mai
- Hat Yai
That does not mean waiting until arrival is the best strategy. It means there is some backup support if something goes wrong.
The safer strategy is still to submit early in the official window and keep the QR code accessible from your email or saved to your device. The FAQ says you do not have to print it, though printing can still be a reasonable fallback if you prefer paper.
Just as important, travellers should use the official TDAC website only. An official immigration office notice warns travellers to use the real government website and says the TDAC service itself has no fee. That matters because arrival-form systems attract copycat services that try to turn a free government form into a paid convenience product.
If a site is asking you for an unexplained extra service charge or does not clearly route through the official immigration domain, stop there and go back to the official site.
Realistic expectations and what to double-check
TDAC is not especially complicated once you stop mixing it up with other parts of Thailand entry policy. The real work is simply submitting it in the correct window, with complete and accurate information, using the official site.
Before travel, double-check:
- that you are submitting within the official 3-day or 72-hour window
- that the passport details match the passport you will actually use
- that your flight, address in Thailand, and email are accurate
- whether you are entering Thailand or only transiting without immigration
- that you have saved the QR code or can access the email that contains it
The most useful mental model is this: TDAC is a required entry-reporting step for non-Thai travellers, but it is not a visa and it is not a one-time lifetime registration. It belongs to each entry into Thailand.
That is why the best traffic article on this topic is not one that makes the system sound dramatic. It is one that makes it harder to make preventable mistakes. In 2026, the essential answer is straightforward: if you are a non-Thai national entering Thailand, plan to submit TDAC online within the official window, prepare your passport and travel details in advance, and use the official site only.