Cases where you need to file a tax return in case you work more than two companies.

1. The income from the side job exceeds 200,000 yen per year.

2. You have not received a year-end adjustment from any of your employers.

3. Year-end adjustments have been made in two or more places.

4.YouI want to receive various deductions (e.g., medical expense deduction, mortgage deduction, donation deduction)

The above are cases where a tax return is required, but even if a tax return is not required, it is necessary to file a resident tax return. Please note that if you have even a little income, you will need to declare it.