If you are a foreign resident in Japan and unsure whether you need to file a tax return — known as kakutei shinkoku (確定申告) — you are not alone. Every year, thousands of expats, remote workers, and part-time employees find themselves confused about the process. This guide cuts through the confusion and gives you a clear, practical walkthrough of tax return filing in Japan for foreigners.
Do You Actually Need to File a Tax Return in Japan?
Not everyone in Japan has to file. Your situation determines whether filing is required, optional but beneficial, or unnecessary.
You are generally required to file if you:
- Are self-employed, a freelancer, or run your own business
- Earned income from multiple employers during the year
- Have income from overseas (for example, remote work paid by a foreign company)
- Earned more than ¥200,000 in side income on top of your main salary
- Received rental income, investment gains, or other non-salary income
You may want to file voluntarily if you:
- Had too much income tax withheld by your employer (you could get a refund)
- Had high medical expenses during the year
- Made donations through the Furusato Nozei (hometown tax) scheme
- Started or left a job mid-year and did not complete year-end adjustment (nenmatsu chosei)
- Paid mortgage interest on a home loan (first-year claim requires filing)
If you are a salaried employee whose employer completed nenmatsu chosei and you have no side income over ¥200,000, you generally do not need to file. When in doubt, contact your local tax office (zeimusho) — staff at major offices often have English-speaking support available during tax season.
Key Deadlines to Know
The standard kakutei shinkoku filing period runs from mid-February to mid-March each year, covering income from the previous calendar year (January to December). The exact dates shift slightly year to year, so always confirm the current deadline on the National Tax Agency (NTA) website.
- Refund returns: You can file from January 1st — no need to wait until February
- Tax payment deadline: Usually mid-March; late payment incurs penalty interest
- Extension requests: Possible in some cases — ask your tax office early
Required Documents: What to Prepare
Gathering your documents before you sit down to file saves a lot of stress. Here is a practical checklist:
- My Number (Individual Number) card or notification slip — essential for all filings
- Withholding tax slip (gensen choshuhyo) — issued by your employer, usually in January
- Bank account details — for receiving any refund directly
- Receipts for deductible expenses — medical bills, insurance premiums, donation receipts
- Proof of overseas income — contracts, payment records, bank statements (if applicable)
- Resident card (zairyu card) — for identification at the tax office
If you have income from abroad paid in a foreign currency, you will need to convert amounts to Japanese yen using the TTM exchange rate published by the Bank of Japan for the relevant dates. Keep records of all conversions.
How to Actually File: Your Options
Option 1: File Online via e-Tax
The NTA's e-Tax system lets you complete and submit your return from home. You will need your My Number card and a compatible card reader, or you can use the smartphone app method. The guided form is available in Japanese, but the NTA publishes English guidance documents to help you follow along. This is the most convenient option once you are set up.
Option 2: Visit Your Local Tax Office (Zeimusho)
During filing season, tax offices set up special counters and often have staff who can assist in basic English or provide translated guidance sheets. Bring all your documents and arrive early — queues can be long in February and March. This is a good option if your situation is straightforward and you prefer face-to-face help.
Option 3: Use a Tax Accountant (Zeirishi)
If your tax situation is complex — for example, you have income from multiple countries, run a business, or hold overseas assets — hiring a licensed tax accountant (zeirishi) who works with foreign clients is worth considering. Fees vary, so confirm costs upfront. Some accountants in major cities offer services in English.
Foreign Residents and Overseas Income: A Special Note
Japan taxes residents on their worldwide income, not just income earned in Japan. If you are a tax resident of Japan (generally, if you have lived here for more than one year), income from remote work for a foreign employer, freelance clients abroad, or overseas investments must be declared. Japan has tax treaties with many countries to prevent double taxation — check whether your home country has a treaty with Japan on the NTA website, as this can significantly affect what you owe.
Quick Comparison: Filing Methods at a Glance
| Method | Best for | Japanese needed | Cost |
|---|---|---|---|
| e-Tax (online) | Tech-comfortable filers, simple cases | Moderate (English guides available) | Free |
| Tax office visit | First-timers, straightforward income | Basic (some English support) | Free |
| Tax accountant | Complex income, overseas assets, business | Minimal (if English-speaking accountant) | Paid (varies) |
Common Mistakes to Avoid
- Missing the deadline and incurring late penalties
- Forgetting to declare overseas income, which can trigger back taxes and fines
- Not keeping receipts for deductible expenses throughout the year
- Using the wrong exchange rate when converting foreign currency income
- Assuming your employer handled everything — always confirm whether nenmatsu chosei was completed
Summary: Take It One Step at a Time
Filing kakutei shinkoku as a foreign resident in Japan feels daunting at first, but it is very manageable once you understand your situation. Start by checking whether you are required to file or could benefit from a voluntary refund return. Gather your documents early, choose the filing method that suits your comfort level, and pay close attention to the annual deadline.
If you earn income from overseas or have a complex financial situation, do not guess — consult a tax accountant or contact the NTA directly. Japan's tax office staff are generally helpful, and English resources are improving every year.
Getting your taxes right protects your status as a resident, keeps your finances in good order, and — if you are due a refund — puts money back in your pocket. You have got this.
This article is general practical information only and does not constitute financial, legal, or immigration advice. Tax rules change — always confirm the latest details on the NTA official website or with a qualified professional.