TDAC and THIM - Two Systems, One Trip: Don't Skip Either
In short
The Thailand Digital Arrival Card (TDAC) remains the mandatory pre-arrival declaration for most travellers. The incoming THIM app adds immigration workflow tools - they are related but not interchangeable.
What's changing
Since 2025, TDAC has been the official channel to submit arrival information digitally before landing. THIM, rolling out in 2026, targets immigration processing efficiency - queue reduction, digital identity checks, and eventual reporting features.
Confusion arises when travellers assume completing one satisfies the other. Airlines and border officials can deny boarding or delay entry if TDAC is missing, even if THIM is installed. During rollout, requirements may differ by airport - Suvarnabhumi and Don Mueang typically lead policy first.
Who is affected
Every international arrival - complete TDAC within the published window before departure (typically 72 hours).
Families and groups - one submission per traveller; minors included.
Long-stay visa holders re-entering - TDAC still required each entry; visa stamp governs stay length, not the apps.
Cruise and land-border entrants - confirm port-specific rules; digital requirements lag air arrivals.
What you should do
Screenshot your TDAC confirmation and keep THIM installed before you fly. On a managed application, we send a country-specific arrival pack updated when Immigration publishes changes.
Check how this affects you