You don’t have to right away, but if you don’t you won’t get any traffic tickets in the mail. You cannot extend your yearly road tax/registration with outstanding tickets. However, you can pay for these tickets at the same time as your registration without any penalty fees.
Paperwork - 1) vehicle title book (original),
2) Passport/ ID copy (picture page, visa, tm-30)
3) valid residency certificate (original)
* In the case you want to correct the spelling of your name or changing your last name, then additional documents such as an old passport, marriage certificate, or other name change documents will be required.
DLT Fee - approx. 75 THB
EA Service Fee - check here for rates
Vehicle - not required