Kakutei shinkoku (確定申告) is the declaration of your entire income for the period from 1 January to 31 December of the previous year, along with the amount of tax payable on that income as calculated by you, which you make to your regional tax office.
Those required to file a final tax return include those who are self-employed, those who have been working in Japan yet did not undertake a year-end adjustment (nenmatsu chōsei / 年末調整), those who received income from two or more employers (for example, a language teacher who taught at two or more schools), and so on. People who left their previous job and did not return to employment after that are also required to file a final tax return.
Most wage earners are not required to file a final tax return because the calculation and payment of income taxes are completed through the year-end adjustment by the person paying the salary. For information on wage earners who must file a final tax return, see the National Tax Agency website (http://www.nta.go.jp/english/taxes/individual/12018.htm).
If you are going to file a final tax return and have received an income tax withholding statement (gensen chōshū hyō / 源泉徴収票), a slip of paper about the size of a postcard, from your employer, please take care not to lose this, because you will need it for your final tax return.
Also, if you paid more than 100,000 yen in medical expenses last year, by completing a final tax return you may be able to receive a refund of excess tax paid.
Your final tax return filed this year will be for income earned from 1 January to 31 December of 2019 or Heisei 31 / Reiwa 1. The period for filing your final tax declaration is from Monday 17 February to Monday 16 March [extended to Thursday 16 April].
What you need:
If you need to submit a final tax return, make sure you have:
- Income Tax Withholding Statement (gensen chōshū hyō / 源泉徴収票) and all other paperwork which shows any withheld tax
- Resident Card (zairyū kādo / 在留カード) / Passport
- Bank account passbook (tsūchō / 通帳)
- Seal (inkan / 印鑑)
- Those who wish to apply for a deduction for dependents outside of Japan (see Exemption for dependents, etc., for relatives living outside Japan at https://www.nta.go.jp/english/taxes/individual/12016.htm):
• Evidence to support your relationship with the dependent (birth / marriage certificate etc.)
• Proof of remittance (transfer slips etc.)
- Those who wish to apply for medical expense deductions are required to bring their receipts issued by the respective medical institution/s.
- Those enrolled in National Health Insurance or Social Insurance are required to bring proof of payment of all premiums.
- Those who purchased a home in Japan using a loan, should ask their financial institution for a Home Loan Year-end Balance Certificate (jūtaku rōn nenmatsu zandaka shōmeisho / 住宅ローン年末残高証明書).