Japan to work little friends must know these sites (domestic IP do not know whether you can access):
1. Japan Pension Service official : https://www.nenkin.go.jp/info/index.html
Japanese pension (equivalent to China's pension insurance) into the National Pension and Welfare Pension, workers paid by the company, and the company is the obligation (ie, must) give you to pay the employee's pension (of course, in the case of people in Japan do not know a lot the company will not give you all pay, unless you strong demand), by the company and the individual employee's pension each bear 50%, much higher than the national pension.
Of course, many people may not intend to stay in Japan long-term, but in fact as long as you pay at least after six months of the employee's pension, so you return home within (two years all can apply for a refund, the refund of 80%, 20% paid source the tax) can be returned "back off a moment gold", specific back off method, reference: https://www.nenkin.go.jp/service/jukyu/sonota-kyufu/dattai-ichiji/20150406.html
Employees' Pension withholding calculated reference: https://keisan.casio.jp/exec/system/1324270485
National pension is a personal thing the owner or at least 20 years of age, are required to pay 100% of personal commitment.
2. Immigration Office of Management and then left (before 2019 the Authority)
Official website: http://www.immi-moj.go.jp/
Apply for renewal for another stay, forever and so can apply for access to this website
3. source of income
Japan's National Tax Agency official website: https://www.nta.go.jp/publication/pamph/gensen/zeigakuhyo2018/
2019 personal tax table Source: https://www.nta.go.jp/publication/pamph/gensen/zeigakuhyo2018/data/01-07.pdf
Apply for dependents individual source of relief: https://www.nta.go.jp/publication/pamph/gensen/zeigakuhyo2009/data/07.pdf
lz first came to Japan in March, continuing discoveries, unfinished, be continued ......