How to accurately calculate net salary

Hello,

Yes, this is another tax calculation post and I’m sorry. I’ve read other posts and in one way or another, I’m unable to get the accuracy that I need to make an informed decision. Some context: I’m currently based in the EU and I just got a job offer from a Japanese company, which entails a relocation to Tokyo. Now, since I’m moving with my family (a wife and 2 kids), I need to accurately calculate my monthly income in order to understand how sustainable this project will be. Some more numbers:

\- The offer is about 20M JPY / year
\- Wife will be unemployed, at least initially
\- Kids will need to go to an international school, as they don’t speak a word of Japanese
\- The job is based in Tokyo, although the format is WFA (Work From Anywhere in Japan), so I believe I’ll look for an apartment to rent somewhere around Tokyo but not necessarily in the city
\- Hard to say now, but I’m thinking about staying in Japan for around 3-5 years

Now the questions:
\- How do I calculate the net salary, considering I have 3 dependants?
\- What type of expenses are deducible? Considering my situation, I’m thinking about rent and tuition fees, maybe?
\- Is it true that new residents will not pay the resident tax for the first year?
\- Are there any other tips/strategies to lower the taxation? I heard something about Furusato Nozei and iDeCo, although I’m not sure if I’m eligible for it
\- When leaving Japan, is it possible to get back any pension contribution I have accrued so far?

Thanks in advance, and feel free to ask questions about anything important I omitted!

by Routine-Sort-8307

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