The spouse of a person that is holding a Japanese Working visa should possess a dependent visa.If that's the case, the spouse can go to the Immigration Bureau and carry along certain required documents, and fill out documentation to request permission to work in Japan. The spouse will get a stamp in the passport.This limits working hours to a maximum of 28 hours per week.As Chan Liyanage, the spouse will be required to fill out an annual Tax Declaration form in which he/she states the income for the previous year, and though the work is online, I would think you would have to declare it. I know someone that has an online blog and she pays taxes on her income, but her blog is about Japan, so I'm not sure if that's the difference and she gets lots of earnings through it. The form does ask for any earnings, and they even ask how much money you receive from home, family, etc.Also, there is no limit to what the spouse can do (except for anything in the sex industry or anything that is illegal, but I'm sure that's not an option for you, anyway). There are lots of English teaching jobs, she can teach online on Learn a language online. Etc. The government gives a little monthly stipend for your child, that can help cover some very basic necessities, it can be quite useful.Instead of using private nurseries, apply as soon as the child is born for government nurseries, you pay 3-4X less.Also, note that hospital fees are nearly free for pre-natal care, you only pay when there are complications and you go outside of the appointments. But pre-natal care is nearly free, and when you give birth, the government may assist with hospital fees. We didn't pay anything at all when I gave birth. I feel lucky in that sense. The most important thing is to make sure that you pay your taxes and declare everything (this will apply for both spouses), and also that you have insurance (we have the national health insurance).