WHEN does one have to pay Road Tax?

Is there a deadline?

Does it depend on the plate number?

Right now, I have the pink "2552" on my windshield.

By when do I have to change it to "2553"??

By when do I have to change it to "2553"??

The expiration date will be on that same sticker. It will have the month in Thai script then numerical date and year.

I no longer have the figures but I do know that you pay MUCH more for a four door pickup than a two door. If I remember correctly it was about 4 or 5 times more.

This is because a 2 door pick up is considered a commercial vehicle and a 4 door pick up is considered a passenger vehicle in the same league as a car.