Japan tax audit guide for individuals
Audit triggers, requests for information, preparation, representation, and common mistakes.
A tax examination is usually a document-based review of your income and expenses; prepare by organizing your books and evidence, you may be represented by a 税理士, and the common mistakes are guessing, hiding records, or answering beyond what you know.
Effective: 2026-01-01 to 2026-12-31
Professional review pending — treat as draft and confirm with the authorities.
Key points
- Audits often follow anomalies: large deductions, cash businesses, or inconsistent records.
- You will be asked for books, invoices, and evidence — organize them in advance.
- You may be represented by a licensed tax accountant (税理士).
- Do not guess or conceal; answer accurately and provide supporting records.
Preparation
If you are notified of an examination, gather your books, invoices, contracts, bank and card records, and the documentation behind any large or unusual deductions. The examiner tests whether your reported income and expenses match your records and reality. Reconstructing missing records and reconciling accounts before the visit reduces friction and surprises.
During and after
You may appoint a licensed tax accountant to attend and represent you. Answer questions accurately, provide the records requested, and avoid guessing or concealment — an aggravated penalty applies to falsification. If the examiner proposes adjustments you dispute, there are objection procedures. For anything beyond routine, professional representation is worthwhile.
Who this is for
- Anyone notified of an examination
- Freelancers and landlords with complex records
What this is not
- Corporate audits
- Concealment or falsification triggers the aggravated penalty; get a 税理士 if income was omitted.
Frequently asked questions
Do I need to file a tax return in Japan?
Many employees do not, because tax is settled by year-end adjustment (年末調整). You generally must file (確定申告) if you have side income over ¥200,000, two or more employers, self-employment income, sizeable investment or crypto gains, or you want to claim deductions like large medical costs or a first-year mortgage credit. Filing season is Feb 16 – Mar 15 via e-Tax. When unsure, check the NTA guidance or ask a 税理士.