Anonymous participant 405 If you can't read Thai you will need an agent or lawyer to file everything.
-+40k to get started on average (not from larger Western centric ones, less from a local bookkeeper but more likely to get something wrong that way imo) almost every bookkeeping and legal firm can do.
Btw the 4 Thais, generally you just need to pay the tax on 4 salaries. I know some places don't even run the salary only the tax cost. That's also for extension later not essential at the beginning (or wasn't last time I talked it over).