Japan’s first AI-native accounting & tax platform
Japan tax filing,
in plain English.
Answer a series of questions about your residency and deductions, most of them yes or no. Your answers become a PDF package built on the official NTA form layouts, ready for you to review, sign and submit. Many simple returns can be finished in one sitting.
- 申告要否Do I need to file?
- 確定申告Final return
- 青色申告Blue return
- 不動産所得Rental income
- 仮想通貨Crypto
- 外国税額控除Foreign tax credit
- ふるさと納税Furusato nozei
Your drafts are stored securely on our servers and are private to your account. In line with Japan’s APPI privacy law, you can export or delete your data at any time. How we handle your data →
Choose your filing path
Personal and company returns are handled separately, so you only see the steps that apply to you.
Personal tax
Individuals and freelancers
Employees, freelancers, and sole proprietors file here. Guided path for residency, employment slips, income, expenses, deductions, review, and a print-ready package.
SMB tax
Registered company workspace
For 株式会社, 合同会社 and other registered companies. Keeps company setup, fiscal-year data, inputs, and package prep separate from personal returns.
Kunai
Track finances over time
Use Kunai as your year-round tracking workspace for receipts, expenses, and draft tax records, then sync ready rows into filing when you need them.
The TaxNinja toolkit
Four tools that share the same data: prepare this year’s return, keep records through the year, run your company books, and use AI with Kemuri protecting your personal details.
Katana
OptionalStart with a conversation
Tell Katana about your year in plain language, or photograph your receipts and payslips. It asks about anything it still needs, shows you every amount it read, and then fills in your return, your Kunai books, your ledger and your company statements. Nothing is saved until you press Apply.
- 1Turn Katana on and say what you want filled in.
- 2Type the amounts, upload a CSV, or scan a receipt photo or PDF.
- 3Check the list of amounts, then press Apply.
Ledger
The guided personal return
The step-by-step personal return. It takes you from residency and income through to deductions, and ends with a set of National Tax Agency forms ready to print.
How it works
- 1Answer a short set of residency and income questions.
- 2Add your income items and deductions.
- 3Check the estimate, then generate the PDF package.
Kunai
Your year-round record book
A spreadsheet-style record book for logging receipts, expenses and income as they happen, so you are not starting from nothing in February.
How it works
- 1Add rows by hand, from a CSV, or from a receipt photo.
- 2Tidy the category and mark the rows that are ready.
- 3Sync the ready rows into your filing when the time comes.
Shuriken
Company statements
Company accounting for your profit and loss, balance sheet and cash flow. Sort your Kunai transactions into categories, then send the approved totals to your corporate return.
How it works
- 1Fill in or check each statement.
- 2Import your Kunai transactions and fix any rows we have flagged.
- 3Send the finished profit and loss totals to your corporate return.
Kemuri
AI privacy filter (always on)
Before anything is sent to an AI, Kemuri removes your My Number and replaces contact details with placeholders. The same protection applies whichever AI provider we use.
How it works
- 1Give consent for overseas transfer, then open the assistant.
- 2Kemuri protects your details before the model sees them.
- 3You read the reply with your own details put back in. Kemuri does not decide your tax position.
Japan’s first AI-native accounting and tax platform
Most tax software bolts an AI chat box onto a form. TaxNinja starts from the conversation. Tell Katana about your year or photograph your paperwork, and it works out what is still missing, then prepares your personal return, your year-round books and your company statements together. The versioned tax engines calculate every yen, and nothing is written until you check the amounts and press Apply.
- Katana
- The AI intake agent. It reads what you write, along with receipt photos, invoice PDFs, bank statements and payslips, then fills in your return and books once you have confirmed the amounts.
- Ledger
- Guided 確定申告 preparation, from residency status and income through deductions to print-ready National Tax Agency forms.
- Kunai
- Year-round bookkeeping. Log receipts and expenses by hand, by CSV or Excel, or from a photo, then sync the ready rows into your filing.
- Shuriken
- Company and SMB accounting. Profit and loss, balance sheet and cash flow, built from Kunai transactions and pushed into corporate filing.
- Kemuri
- The always-on AI privacy filter. In the text you send, your My Number is removed and emails, phone numbers, names and addresses are replaced with placeholders. A photo or PDF is sent as an image and cannot be filtered the same way, so if a My Number appears in the reading, the entire reading is discarded.
- Your data
- Export or permanently delete your own records at any time, in line with APPI obligations.
Covers non-permanent and permanent resident status, employment income and 源泉徴収票, sole proprietor and blue return, rental income, crypto, securities, foreign income and the foreign tax credit, furusato nozei, medical expenses and the housing loan credit.
Expat taxes in Japan, explained in plain English
TaxNinja JP helps foreign residents prepare their own Japanese tax return, in English. We walk you through the parts that trip people up, such as non-permanent versus permanent resident status, your 源泉徴収票, furusato nozei and the foreign tax credit. At the end you get the official NTA forms, filled in and ready for you to print, sign and submit.
For every expat
We cover salaried employees (給与所得者), sole proprietors (個人事業主), landlords, crypto traders, investors, and people leaving Japan part-way through the year. Non-permanent and permanent residents are both handled, and we work out which applies to you before you enter any figures.
Real NTA forms
Your figures go into the official National Tax Agency forms for the year you are filing. If a form or a number we need is missing, we stop rather than hand you a form with gaps in it. Everything you get is a draft for you to check and sign yourself.
English cover letter
A next-steps guide tells you which forms to print, how to pay, and which tax office (税務署) to send them to, worked out from your postcode. Everything you need before the 15 March deadline.
What TaxNinja does for you
- A guided set-up that works out your residency status: non-permanent resident, permanent resident, non-resident, or leaving Japan.
- Covers employment income, sole proprietor income, rental property, crypto and foreign income.
- Deductions covered: national health insurance (国民健康保険), pension (国民年金), iDeCo, furusato nozei (ふるさと納税), medical expenses (医療費), the housing loan credit (住宅ローン控除) and dependants (扶養).
- Proper double-entry bookkeeping, behind a simple inbox-style screen.
- A review screen showing your estimated refund or the amount you owe, updated as you go.
- PDF package with cover letter and pre-addressed envelope label.
- Import your ledger from CSV with English or Japanese column headings, plus crypto CSV files from bitFlyer, Coincheck and Binance JP.
- Built-in real-estate depreciation calculator (NTA 耐用年数, straight-line and declining-balance).
- An AI review that flags likely mistakes before you file, plus a chat where you can ask Japanese tax questions.
- The whole site in English, Japanese, Simplified Chinese and Traditional Chinese.
- Photograph a receipt, invoice, bank statement or payslip, or upload a PDF. Katana reads the amounts, shows you every one, and enters them once you confirm.
Coming next
These are being built now. Each one is ready to switch on as soon as the service it relies on becomes available.
- Filing directly to e-Tax. XML export already works; direct filing needs NTA certification and support for reading your My Number Card by NFC.
- Automatic bank and credit card sync through Moneytree LINK, so your ledger stays up to date without manual entry.
- Auto-fill the official NTA PDF forms field by field.
- Book a licensed tax accountant (税理士) for a final review.
- In-app payment of the tax owed (Pay-easy / credit / 振替納税).
Your feedback decides what we build first. Tell us what you need using the feedback button after you file.