Self-Employed Tax in Japan

Sole proprietors in Japan operate under the kojin jigyo framework — registering as individual business operators (kojin jigyonushi) at the local tax office and filing an annual kakutei shinkoku (final income tax return) each year by 15 March. The tax stack is layered: national income tax, a reconstruction surtax, local inhabitant tax, prefectural enterprise tax, national social insurance contributions, and potentially consumption tax. Understanding each layer — and the blue return election that can reduce them — is essential before operating as a self-employed person in Japan.

For jurisdiction context, see the Japan country overview.

What income tax rates apply to sole proprietors in Japan?

Japan's national income tax (shotokuzei) is progressive, running from 5% on the lowest bracket to 45% on income above JPY 40 million. Business income is net profit — gross revenue minus documented business expenses. The brackets and their progressive deductions, as published by PwC's Japan Tax Summaries and confirmed against NTA guidance, are:

On top of the national rate, a special reconstruction income surtax (fukko tokubetsu shotokuzei) of 2.1% of national income tax applies through 2037, levied to fund recovery from the 2011 Great East Japan Earthquake [1]. Separately, local inhabitant tax (jumin-zei) of 10% — split as 6% municipal plus 4% prefectural — applies to the prior year's income. A forest environmental tax of JPY 1,000 per year was added from 2024. Combined, a sole proprietor in the 33% national bracket faces roughly 43-44% marginal rate before accounting for social insurance and enterprise tax.

How does the blue return (aoiro shinkoku) work?

The aoiro shinkoku (blue return) election under Section 143 of Japan's Income Tax Act (Shotokuzeiho, Act 33 of 1965) gives sole proprietors access to a special deduction unavailable to standard white return (shiro shinkoku) filers. As confirmed directly on the NTA English-language page for the blue return system [2]:

• JPY 650,000 special deduction — available to filers who maintain double-entry bookkeeping AND file via e-Tax (electronic submission through the NTA's e-Tax portal) or keep excellent electronic records (yuryo na denshi chohon). This is the maximum deduction.
• JPY 550,000 special deduction — for filers who maintain double-entry bookkeeping but submit a paper return rather than using e-Tax.
• JPY 100,000 special deduction — for filers using simplified (non-double-entry) bookkeeping.

Beyond the deduction, the blue return provides: (a) 3-year loss carryforward — net business losses from one year can be deducted against income in the following three years (five years for qualifying disaster losses from April 2023); (b) family-employee salary deductibility — wages paid to a working spouse or family member registered under Form Seikatsu Tomeshijuyo Shinseisho are fully deductible; (c) accelerated small-asset expensing — items under JPY 300,000 may be fully expensed in the year of purchase rather than depreciated.

To elect blue return status, sole proprietors submit Form Aoiro Shinkoku Shonin Shinseisho to the local tax office by 15 March of the tax year in which they wish the election to take effect (or within two months of commencing a new business if that start date falls after 15 January).

The white return remains the default for those who do not apply. White return filers receive no special deduction, cannot carry forward losses, and face stricter limits on family-employee salary deductions.

What is the enterprise tax (jigyo zei) on sole proprietors?

The kojin jigyo zei (individual enterprise tax) is a prefectural tax applied under Japan's Local Tax Act (Chihozeiho, Act 226 of 1950) to sole proprietors whose business income — after the annual business owner deduction of JPY 2.9 million — exceeds zero. Business income below the deduction threshold faces no enterprise tax at all. Three business classification categories carry different rates [3]:

• First class (5% rate): Retailers, manufacturers, restaurants, construction contractors, consultants, and most service and commerce businesses.
• Second class (4% rate): Livestock operations, fishery, charcoal and timber production.
• Third class (3% rate): Traditional medical practitioners including anma massage, acupuncture, judo-orthopaedics, and related licensed therapies.

The enterprise tax is assessed by the prefecture where the business is conducted, with payment notices typically issued in August and payments split between August and November. Critically, the enterprise tax paid in a given year is deductible from national income tax business income in the following tax year, providing a partial offset against the combined burden.

What social insurance contributions apply?

Sole proprietors in Japan are excluded from the Employees' Health Insurance (Kenko Hoken) and Employees' Pension Insurance (Kosei Nenkin) systems and must instead enrol independently. Two mandatory systems apply:

National Pension (Kokumin Nenkin): A flat monthly contribution of JPY 17,920 for fiscal year 2026 (April 2025 - March 2026), confirmed by the Japan Pension Service (Nihon Nenkin Kiko) [4]. All residents aged 20-59 who are not enrolled in an employees' pension plan must contribute. The full annual amount of JPY 215,040 is deductible as a social insurance deduction (shakai hoken ryo kojo) against income tax.

National Health Insurance (Kokumin Kenko Hoken): Income-based premiums set by each municipality. Rates typically combine an income-proportional component (roughly 7-10% of prior-year net income in most wards) with a per-capita fixed levy, subject to annual caps — Tokyo's 2025 combined cap for most enrollees runs approximately JPY 1,090,000. Premiums are entirely deductible as social insurance deduction. Sole proprietors in qualifying small-business industries may also join the Shokibo Kigyo Kyosai (small business mutual aid) operated by SMRJ, with tax-deductible contributions up to JPY 84,000 monthly.

What is the consumption tax exemption?

Japan's consumption tax (shohizei) of 10% (7.8% national plus 2.2% local; reduced 8% rate applies to qualifying food and newspapers) [5] is not automatically owed by every sole proprietor. Under the Consumption Tax Act (Shohizei-ho, Act 108 of 1988), a business is exempt from collecting and remitting consumption tax if its taxable sales during the base period (the second preceding calendar year for sole proprietors) were JPY 10 million or below.

A secondary test using the specified period (the first six months of the preceding year) can also trigger mandatory registration if taxable sales in that window exceed JPY 10 million. Sole proprietors below both thresholds are exempt and need not collect or remit consumption tax. Those above the threshold become taxable persons and must file a separate consumption tax return due 31 March (after the 15 March income tax deadline).

Since October 2023, the qualified-invoice (tekikaku seikyusho) system requires B2B suppliers to hold registration as a qualified-invoice issuer for their clients to claim full input-tax credits. Sole proprietors below the JPY 10 million threshold who serve mainly B2B clients face a strategic choice: voluntarily register to issue qualifying invoices, or remain exempt and potentially lose B2B clients who cannot claim input-tax credits on their purchases.

When and how do sole proprietors file?

The annual kakutei shinkoku (final income tax return) covers income from 1 January to 31 December and must be filed with the tax office by 15 March of the following year. If 15 March falls on a weekend or public holiday, the deadline shifts to the next business day. Sole proprietors who owed more than JPY 150,000 in national income tax the prior year must also make two provisional tax payments (yoteino zei) in July and November of the current tax year. Local inhabitant tax is billed separately by the municipality, usually in four instalments starting June. Enterprise tax bills arrive from the prefecture in August and November. E-Tax filing is strongly recommended — it is both faster and, for blue return filers, the gateway to the full JPY 650,000 special deduction.

For specialist guidance on the full picture, consult a qualified tax professional (zeirishi) registered with the Japan Federation of Certified Public Tax Accountants' Associations (JFCPTA). A zeirishi can advise on blue return election timing, business-expense categorisation, and the consumption-tax registration decision — each of which affects the final tax outcome for Japanese sole proprietors.