There are two types of taxes in Japan, national and local, and you will have both types deducted from your RIKEN salary:
You can find additional information about Japanese taxes on the following website:
Income tax is calculated on January 1 each year, based on your total income from January 1 to December 31 the previous year. If you are employed by RIKEN, income tax will be automatically deducted from your salary. At the end of the year, RIKEN will adjust for over- or underpayment of taxes. This is known as the year-end adjustment.
Residents’ tax is a local tax based on your income. It usually consists of municipal tax and prefectural tax, bundled together.
There are a few key points to note:
Year-end Tax Adjustment
Around the end of October, you will receive some documents to fill out for the year-end tax adjustment (Income Tax). This is to correct any over- or underpayment that may have resulted from your taxes being deducted from your salary through the year.
For foreign researchers working at RIKEN, the most common deductions are Deduction for Spouse and Deduction for Dependent. If your family members or other dependents have changed (for example if you got married or had a baby this year), you should write this information in the appropriate form.