Pension and Health Insurance between job changes

Hi everyone, I’m posting on behalf of my husband (Japanese) because I don’t want any late payments affecting my status.

He is currently on unpaid leave at his current company due to stress issue based on doctor’s advice and he already used up all of his paid leave for the first two weeks of the mental leave.

He recently received a new job offer that has its start date on March 2. I’m afraid that if we inform the current company about it, they will cut him loose immediately because there is no paid leave yet to utilize, and he already handled all of his handover before he went on the mental leave.

Now, I hope to receive your advice on the below questions:

* Scenario 1: He manages to convince his current company to let him stay on its payroll (unpaid, of course) until February 28 so they can handle his pension and health insurance payment in Feb paycheck – most likely we will have to transfer money to the company.

Then, his new job starts on March 2 – What is happening to March 1’s pension and health insurance Payment? His resident tax is already paid separately when we received the 請求票 from the city hall, so it’s not an issue.

For pension, will his new company handle it in the March’s payment? What about the health insurance? Does he need to enroll in National Health Insurance for March 1 only and does he need to go to the City Hall to unenroll himself when he starts his new job? (So two city hall visits?)

* Scenario 2: If he has to leave his current company before the end of February – let’s say February 20, then what will happen to his pension and health insurance payment from February 24 to February 28 and then March 1? Is there any action he has to take?

Thank you in advance! Normally we manage to get the dates lined up between job changes but this time it’s a special case and I’m a bit loss.

by Yoshi_Commie