First some background: I am a 31 year old American with a J-wife, we have a one-year-old and another child on the way. I have paid about 10 years into SS in the US, two years of Shakai Hoken here and a year in the Kokumin Hoken /Nenkin system with my current part-time BOE job for which I plan on working for another three years. I will be taking the family back to the US in early 2015, permanently.At 34, I will have a good 30 years more to pay into Social Security. From what little I understand of the Totalization agreement between the US and Japan, if I try to collect my (small) pension from Japan upon retirement, my Social Security payments will be greatly diminished. To me, it seems like a bad move.
I am assuming I should not try to collect my J-pension in order to receive full Social Security benefits.
My questions are:
1) Is the above incorrect in any way?
2) Assuming the above is accurate, what happens if I stop paying my nenkin now?
3) Should I stop paying nenkin now?
4) I have paid about 540000Y into the nenkin system as of today and three more years means another 540000Y. To qualify for the "Cash-out-when-you-leave" option, must I pay until I leave the country?
5) Does not paying nenkin affect my US taxes or Social Security in any way?
Thank you dearly to anyone who responds as I am hopeless when it comes to these matters and the wife is worse than I.

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