Income Tax jumped from 4.7% to 14.75%

Income Tax

Hi good day to everyone! I’m a half Japanese half Filipino who just came back to Japan hoping to live here long term. I was wondering how taxes specifically income tax work here.

I have a part time job right now and last month I had a salary of

134k yen minus 6,300 yen income tax = 127,700

so that’s around 4.7% on income tax

however this month

255k yen minus 37,600 yen income tax = 217,400

14.75% on income tax

How come my income tax jumped that high I know my salary increased but to be this high without the other monthly taxes it’s just I want to know why is it because of resident tax? but my salary invoice specifically say INCOME TAX only

by Ok_Resolve6841