Japan Tax Return Guide for Foreign Residents | Who Files, Documents & Deadlines Explained

“Do I really have to file a tax return in Japan?” “Isn’t year-end adjustment enough?” If you’re a foreign resident in Japan, the kakutei shinkoku (tax return) is one of the most confusing — and consequential — chores of the year. Get it wrong and you face penalties of up to 30%. Get it right and you can claim back tens of thousands of yen. This guide walks you through who needs to file, the documents required, the e-Tax process, deductions you can claim, and the rookie mistakes to avoid — whether you’re a salaried employee, freelancer, or here on a working holiday.

📑 Table of Contents

• What is kakutei shinkoku? Resident vs Non-resident
• Who needs to file
• Documents checklist
• Filing in 5 steps
• Filing online via e-Tax
• Deductions worth claiming
• Common misconceptions
• Drawbacks & cautions
• How to choose your filing method
• FAQ
• Sources & Links

What is kakutei shinkoku? Resident vs Non-resident

Kakutei shinkoku is Japan’s annual income tax return — the process of declaring your income from January 1 to December 31, calculating tax owed, and settling any difference. Most salaried employees in Japan never file because their employer handles “year-end adjustment” (nenmatsu chosei). But if your situation is even slightly outside the norm, you’ll need to file yourself.

Who counts as a resident?

Under Article 2 of Japan’s Income Tax Act, you’re a “resident” (kyojusha) if you have a domicile (jusho) in Japan or have lived continuously in Japan for 1 year or more. Residents are split into two sub-types:

• Permanent resident (eijuusha): Japanese citizen, OR foreigner with 5+ years of domicile in Japan within the past 10 years. Taxed on worldwide income, full stop.
• Non-permanent resident (hi-eijuusha): Non-Japanese with 5 years or less of domicile in past 10 years. Taxed on Japan-source income + foreign income remitted to Japan.

Non-residents

If you have no domicile in Japan and haven’t stayed for 1+ year, you’re a non-resident. Only Japan-source income is taxed, usually via 20.42% withholding at source. No filing required in most cases.

Who needs to file a tax return

Here’s the cheat sheet. If even ONE of these applies to you, start preparing.

Salaried employees

If you’re a “salaryman,” your employer files for you via year-end adjustment — except if salary exceeds ¥15M, you have multiple jobs, claim mortgage deduction in year 1, retired mid-year, or have foreign income. Just ask your HR: “Do I need kakutei shinkoku this year?” — fastest path to clarity.

Freelancers and self-employed

If business income exceeds the basic deduction (¥480,000), you must file. Uber Eats riders, language teachers, freelance designers, YouTubers — anyone with self-employed income. Keep all receipts and invoices for 7 years (5 for paper).

Investors with foreign accounts

If you hold a Japan brokerage’s “specified account with withholding,” you don’t need to file for stocks. But foreign brokers (Interactive Brokers, Charles Schwab) and crypto exchanges aren’t covered — you must declare gains/losses yourself. This catches many expats off guard.

Documents checklist

Required documents vary by situation. Below covers the most common scenarios.

Filing in 5 steps

Even first-timers can finish this in a weekend if you start early. The trap is waiting until March — tax offices in Tokyo and Osaka get genuinely chaotic in the final week.

STEP 1: Gather your documents

Collect your withholding slip, deduction certificates, medical receipts, donation certificates, and bank info. Freelancers should reconcile income/expenses in accounting software like freee or Money Forward first.

STEP 2: Access NTA’s online preparation tool

The NTA tax return preparation portal is browser-based. It’s Japanese-only, but combined with Google Translate’s Chrome extension, English speakers can navigate it. Choose between My Number Card login (recommended) or ID/Password method.

STEP 3: Enter income & deductions

Type the figures from your withholding slip directly. Add medical, donation, and insurance deductions as applicable. The tool auto-calculates tax. Salaried employees: 1-2 hours. Freelancers: 3-5 hours.

STEP 4: Submit (e-Tax / Mail / In-person)

e-Tax is open 24/7 with refund speed advantage. Mail must arrive by Mar 15. In-person: tax office or temporary venue — long queues mid-March.

STEP 5: Pay or wait for refund

If owed: pay via bank transfer, convenience store, or auto-debit by Mar 15. If owed a refund: deposit takes 4-6 weeks (faster via e-Tax).

Filing online with e-Tax

e-Tax is Japan’s national e-filing system. As of 2025, around 75% of individual income tax returns are filed via e-Tax — paper is the minority now.

My Number Card method

Requires the My Number Card. Your iPhone (iOS 13.1+) or Android (NFC-capable) reads the card to log in. No PC, no card reader needed if you use a smartphone. Note: a Residence Card alone won’t work — you need the actual My Number Card.

ID/Password method

Backup option for those without My Number Card. Visit your tax office in person to verify ID, get login credentials. NTA has stated this is a transitional measure and will be phased out.

Why e-Tax wins

• Open 24/7 (deadline 23:59 on Mar 15)
• Refunds arrive ~3 weeks faster than mail
• Some attachments (like withholding slip) can be skipped
• Last year’s data carries over to save typing

Deductions worth claiming

Foreign residents qualify for nearly every deduction Japanese citizens use. Skip these and you’re literally throwing yen away.

Medical expense deduction

Qualifies if family medical bills exceeded ¥100,000 in a year (or 5% of income if income below ¥2M). Includes dental, prescriptions, OTC meds (Self-Medication Tax System), and even some hospital transport. You can pool a “household” — your spouse and kids’ bills count too.

Furusato Nozei (hometown tax)

Yes, foreign residents can do this. Donate to a Japanese municipality, get gifts (rice, beef, sake, fruit), and reduce your tax. A ¥5M-yen earner can donate around ¥60,000 with only ¥2,000 net cost. Satofull and Furusato Choice are the major platforms (Japanese-only).

Spouse / dependent deductions

If you support family abroad, you can claim them — but since 2023, you must submit proof of remittance (¥380,000+ per year) and proof of relationship (marriage/birth certificate). The bar is higher than before, but still worthwhile if you genuinely send money home.

Common misconceptions

Myth 1: “Year-end adjustment is enough for me”

True for most salaried employees, but NOT if you have side income over ¥200k, medical expenses over ¥100k, donate to over 6 hometowns under furusato nozei, are in your first year of mortgage deduction, or have foreign income. Many foreigners discover too late they qualify.

Myth 2: “Foreigners don’t pay Japanese taxes”

If you’re a resident, you pay the same income tax as Japanese citizens. Even non-permanent residents pay tax on Japan-source income. Having a non-Japanese passport changes nothing about your tax obligations once you have a Japanese address.

Myth 3: “e-Tax has English support”

Sadly no — the NTA online preparation portal and e-Tax interface are Japanese only. Use Google Translate (Chrome extension) for real-time translation, or hire an English-speaking tax accountant. NTA does publish English info pages (NTA Individual Income Tax), but the actual filing screens are Japanese-only.

Drawbacks & cautions

Caution 1: Late filing penalties are brutal

Miss March 15 and you owe additional tax of 15-30% of the unpaid amount plus delinquency interest up to 8.7% per year. Even one day late triggers it.

Caution 2: Leaving Japan? Appoint a tax representative

If you leave Japan before filing season, you must designate a “tax representative” (zeimu kanrinin) before departure — otherwise you’re forced to file and settle the entire year’s tax at exit. Tax offices won’t process refunds without one. Most expats hire an accounting firm for this.

Caution 3: Foreign accounts & crypto

If your foreign asset balance exceeds ¥50M as of December 31, you must submit an “Overseas Assets Report” (kokugai zaisan chosho) by June 30. Penalty for non-submission: up to 5% added tax. Crypto is treated as miscellaneous income, with all overseas exchange transactions also requiring declaration.

Caution 4: Language barrier

Tax offices and e-Tax operate primarily in Japanese. Some big-city tax offices have 1-2 English-speaking staff, but availability varies. NTA’s English helpline exists but covers limited ground.

How to choose your filing method

Let’s match a method to your situation.

Pattern 1: Simple salaried filer

Refund-only return (medical + furusato nozei) → use NTA portal directly. 1-2 hours. ¥0 cost.

Pattern 2: Freelancer / side income

Accounting software like freee or Money Forward Cloud at ¥1,000-2,000/month auto-generates books and tax forms. The blue return special deduction (¥650,000) alone usually pays for the software many times over.

Pattern 3: Foreign income / complex

If you have US stocks, crypto, foreign property — find an English-speaking tax accountant (zeirishi). The Japan Federation of Certified Public Tax Accountants directory lists English-capable members. Fees ¥50,000-200,000, but the cost beats penalty risk on multi-jurisdiction issues.

FAQ

Q1: I changed visa status mid-year. Anything different?

If you switched from student to working visa during the year, you’ll likely have multiple withholding slips. Filing kakutei shinkoku to reconcile is usually the cleanest path even if not strictly required.

Q2: My spouse on a dependent visa earns part-time. Do they file?

Income under ¥1,030,000 → spouse deduction available, no separate filing needed. ¥1.03M-1.5M → “spouse special deduction” applies. Above ¥1.5M → spouse files independently.

Q3: I left Japan last year. How do I file?

Submit a “Notification of Tax Representative” (nozei kanrinin) before leaving. Your representative files in your name. Common solution: hire a Japan-based accounting firm, fees ¥50,000-100,000.

Q4: How do I declare crypto gains?

Treated as miscellaneous income, taxed at marginal rates. Salary + crypto gains over ¥3.3M → 20%+ rate. Download all transaction history (including offshore exchanges like Binance) and convert to JPY at each transaction date. Tools like Cryptact automate this.

Q5: I overpaid in past years. Can I get money back?

Yes, file a “Request for Correction” (kosei no seikyu) within 5 years of the original deadline. For example, if you forgot to claim medical expense deduction 3 years ago, you can still recover it.

Summary

• If you’re a Japan resident, you almost certainly fall under Japan’s tax system regardless of nationality.
• Filing window: Feb 16 – Mar 15 (2026 income → due Mar 16, 2027 with weekend adjustment).
• e-Tax requires My Number Card — it’s the fastest path with refunds 3 weeks earlier.
• Medical expenses over ¥100k, side income over ¥200k, and furusato nozei are the highest-ROI deductions.
• Leaving Japan? Designate a tax representative before departure to avoid hassle.
• If your situation is complex (foreign income/crypto), hire an English-speaking tax accountant — peace of mind is worth the fee.

Disclaimer: This article contains affiliate links. Information is current as of December 2025. Tax laws change frequently — always verify with the National Tax Agency (NTA) or a licensed tax accountant before filing.