I'm planning to take out a multientry Tourist visa from ~November. However, somewhere around October I'm planning to go to Japan, and I'll possibly visit Bangkok for a week or two on the way. Is it okay to use a visa exemption for September-October if I have a multientry visa prepared for November?
Or if I have a multientry visa, I have to use it as soon as I arrive?
TLDR : Answer Summary
The user is inquiring about the possibility of using a visa exemption for a visit to Thailand before their multientry Tourist visa becomes effective in November. It is clarified that once a multientry Tourist visa is issued, its validity period begins immediately, and it lasts for six months, regardless of whether it is used upon arrival. Thai Immigration may also require the user to utilize the multientry visa upon entry instead of opting for a visa exemption.