score:14
It's not enforced at all, and more importantly, it's not even applicable: as a tourist it's clear that you'll be exporting whatever you bring in, particularly if it's used.
The regulations are there for professional importers, including people with undeclared suitcases full of identical, shrink-wrapped products.
For what it's worth, I've traveled extensively to Thailand for work and pleasure and have gone through customs 30+ times, nearly always carrying one or two laptops, multiple mobiles, etc. I've never been asked a single question about electronics.
Upvote:7
Thailand does not tax temporary imports, such as tourist's personal electronics.
It does tax items that are brought as gifts for a Thai resident, items for resale or items that will be left in the country for other reasons.
Thailand does not require you to declare personal items such as this, and as such won't even know (or care) what you have.
As jpatokal alluded to Thai Customs are fairly lax (I walked through with four higher end bicycles and they asked why, I said for my friends to ride and they waved me through). But that said, they are getting much stricter on limits on alcohol and tobacco products, when they say you are allowed 1 liter duty free, they mean you are allowed 1 liter period.