Understanding Income Tax in Japan
If you work in Japan, you are required to pay income tax. The scope of taxation differs depending on whether you are a resident, non-permanent resident, or non-resident, and varies based on how long you have lived in Japan and where your income comes from.
You may need to file a tax return (kakutei shinkoku) depending on your income. By filing a tax return, you may receive a refund if you have overpaid income tax. The submission deadline is usually March 15, but if you are leaving Japan, special procedures are required.
There are also various income deductions available. For example, if you are supporting family members, or if you have paid social insurance premiums, you may be eligible to receive deductions.
Source
出入国在留管理庁
This information is reference material based on official announcements. Always verify accurate information on official websites or with relevant authorities.