Taxing income gained from outside Japan

I have my regular income from my salary working for a Japanese company. Some times I do some freelancing work for customers outside japan.it has been 1.5 years and I am doing that without reporting this extra income. I used to send this extra income to my family at my home country. Not sure how to report such income or how much deduction I can get!
Does my company should know that to be considered during end of year taxes adjustment?

1 comment
  1. You have to report it to the tax authority during Feb 16-Mar 15 of the following year of your business.

    You don’t need to report it to your employer as year-end adjustment.

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