Hi Mary,
You seem to want to simple, cut-and-dry answers to a complex set of questions. For instance, yes, if, as you suggested, you were to become a freelancer, you could join the National Health Plan right away. But there is another -- often less expensive -- option that many people don't know about. Japan has a program, similar to COBRA in the USA, that allows people to keep their previous health insurance for up to two years instead of switching immediately to the National Health Plan, which is often more expensive. Talking directly to someone in your husband's personnel department would be a good idea in that situation.
You mentioned that your pension has been through your husband as his dependent, and that your husband's employer pension payments cover you. That implies you are probably only getting numerical credit toward the necessary 300 months (or, according to the recent law change, 120 months), but no actual financial credit because you aren't working. If I were in your situation, I'd check into that directly with the nenkin office and ask for an explanation.
The pension system here is not simple. It is confusing even for Japanese people, and the rules change often.
You wrote: "...when I read the Japanese official pension office website (in English), it talks of how when your new employer registers you with the employers pension plan, you are also automatically enrolled in the National pension and makes it sound like you legally are required to have both at that point. Perhaps they meant you are legally required to have SOME form of pension scheme. But not both, correct?"
Yes. Japan has a two-tier nenkin system. For instance, in my case, as a full-time employee of a university, I have paid for many decades into what has now become the kosei nenkin system, not into the kokumin system. However, I will get BOTH a kosei nenkin pension (the larger pension) and a kokumin nenkin pension (the smaller pension). The kokumin nenkin part of the pension is paltry, even for someone who has paid into the nenkin system for many decades.
By the way, if you are from a country such as the USA that has social security totalization with Japan, that adds another layer of complexity. Look into totalization for Japan and your home country.
In short, if I were in your situation, I would not go with simple answers from a forum like this. Take an hour of two of your time and go to your local nenkin office and get some official answers in writing. If language is an issue, take a Japanese-speaking friend.
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