What to do
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Decide whether the requirement applies
The Immigration Bureau's current rule covers all non-Thai nationals entering the Kingdom by air, land or sea. That includes infants and children, so a family submission must contain an entry for each traveler. The system permits a group submission, but one shared submission does not remove the need for each person's information.
A passenger who remains in airport transit and does not pass through Immigration does not need TDAC. If the passenger leaves the transit path, passes Immigration or enters Thailand, the exception no longer fits. Crew are also listed separately as exempt in the FAQ; this answer does not extend that exemption to ordinary passengers.
Use the current submission window
Submit through the Immigration Bureau's official TDAC site within three days including the arrival date. The current FAQ also describes this as up to 72 hours before entry. Use that bounded wording rather than reading the guide's shorter phrase, '3 days in advance,' as an instruction to submit exactly three calendar days earlier.
The official material does not publish a separate midnight or time-zone calculation for every itinerary. If travel spans several time zones, use the live portal's accepted arrival date and do not rely on a remembered deadline from an older article. TDAC must be completed again for every new entry.
Prepare the fields and correct errors
Have the passport, personal details, arrival and travel information, Thai accommodation address, requested health-declaration information and an email address ready. The guide says details are entered in English. Review any data obtained from the passport's machine-readable zone instead of assuming the scan is correct.
Most trip or accommodation changes can be handled through the update function before entry. Full name, passport number, nationality and date of birth follow the stricter branch in the FAQ: submit a new form with the correct identity information. When multiple forms exist, the system says it uses the latest valid submission.
Keep the card without treating it as permission to enter
After submission, download the returned card or QR code and keep it on a device. Printing is not required, although the FAQ says a paper copy can be useful when a device is unavailable. If the QR email does not arrive, the official instruction is to contact the Immigration officer at the entry checkpoint.
TDAC replaces the arrival-card process; it is not a visa and does not guarantee admission. Visa status, passport validity, Customs requirements and Immigration discretion remain separate decisions. Use only the `tdac.immigration.go.th` service linked from the official guide rather than an unofficial paid form.
Evidence
Sources
2 dated records support the material facts on this page.
- Thailand Digital Arrival Card — Welcome to Guide (opens in a new tab)
Immigration Bureau, Royal Thai Policeofficial governmentChecked
- Thailand Digital Arrival Card — Facts & Questions (opens in a new tab)
Immigration Bureau, Royal Thai Policeofficial governmentChecked