Post-retirement health insurance cost & city tax

[Zara]

Here are some exact figures in my case.
Age 67, two years retired from full-time university teaching.
Pension = ¥2 million (combined national pension and private university pension)
Part-time job = ¥2 million
Thus, a total income of ¥4 million.
Kokumin kenko hoken (national health insurance) = ¥224,790/year
kaigo hoken (nursing insurance) = ¥144,000/year
Kyoto city tax = ¥85,000.
So I am paying a bit less than 10% of my income for health insurance (including nursing insurance). If I have miscalculated, please let me know.
I wonder how long I have to pay the nursing insurance. Until age 75? Until death?
And I will be interested to see how much lower my national health insurance payment becomes when I am 70 and can no longer work part-time at a university and have only the pension.

[Tkydon]

There is a good doc on Shibuya-ku's website, here:

https://www.city.shibuya.tokyo.jp/asset ... 056767.pdf

The premium is based on the previous tax year's income, say Jan-Dec 2020 and payable from July 2021 to June 2022, same as Residential Tax.

Therefore, if you quit work in December 2021, you will still be liable for 6 months Residential Tax and Health Insurance Premiums based on your Income from 2020. You will then have a full year of liability on 2021 Income from 2022 to June 2023, so a total of 18 months based on your pre-retirement income. Only then will the premiums go down to reflect your lower Retirement Income.

[Tkydon]

If anyone has the same breakdown for income that is 100% from investments?

This is very complex. It depends on the nature, amount, allowances, credits and location of the income.