恐縮ですが英語のみでの情報とさせて頂きます。 Expatriates who left jobs in Japan after 1994 may be eligible for a
lump-sum withdrawal payment from the national insurance program. The lump-sum
withdrawal payment is subject to a Japanese income tax of 20%, but that too may
be reclaimed by utilizing our Pension Refund Filing
Service. We are very sorry, however there is a 5 year statute of limitation
to claim this tax refund. If you have received payment after 1999 we can still
help you.
Tax Service 
