Are laws actually enforced here? I hear of many people saying this or that, but I have never seen it myself.
My first employer would not offer me health insurance and never reported my actual wage (more later). When I complained to the appropriate agencies, I was told to just find another job.
No school, as far as I can tell, will report your actual wages. This is no big deal for you to avoid paying taxes here, and possibly your home country. But, if you want to get an APRC, then that would cause trouble. I was told to file an amended return, and submit my bank info to the NIA. But, the tax bureau said that would be unnecessary and to not do that. The NIA said they want tax information, not bank info.
As for kindergarten, many foreign teachers teach kindergarten, part time on the side. It is an open secret and no one seems interested in doing anything about it. I guess it IS something to keep in mind, but like riding without a helmet, nothing much may come of it. (this does not apply in Taipei, where I have heard laws are actually enforced)