Japan's Three-Tier Corporate Tax System: Complete Guide to Corporate Resident Tax

Executive Summary

Japan imposes corporate tax through three legally distinct layers: national corporate tax (23.2% for large companies), national local corporate tax (10.3% of the corporate tax liability), and local taxes comprising corporate resident tax and enterprise tax. From fiscal years beginning on or after 1 April 2026, a fourth national levy joins them: the Defense Special Corporate Tax, a 4% surtax on the corporate tax amount after a ¥5 million credit. For a standard foreign-owned KK in Tokyo, the combined statutory effective rate now sits between roughly 31% and 35%, but the components matter. Each carries different deductibility rules, different filing authorities, and different implications depending on company size and registered prefecture.

Most foreign finance teams see the headline rate, 30% to 35%, and treat it as a single figure. That's a mistake. Corporate resident tax in Japan is one of at least four distinct sub-levies that combine to produce that number, and treating them as a monolith will cost you at tax time.

Here's what the headline hides. The national local corporate tax is assessed on your national corporate tax liability, not on income. Enterprise tax paid this year reduces your national tax base next year. The per-capita component of corporate resident tax is owed even if your company posts a loss. And resident tax is split between prefectural and municipal authorities, producing two separate line items on the same return.

According to PwC (2026), the national local corporate tax is fixed at 10.3% of the corporate tax liability for fiscal years beginning on or after 1 April 2025, and the defense surtax lifts the combined statutory effective rate to approximately 31.5% for companies subject to size-based enterprise tax and 35.4% for those that are not. This guide works through all the tiers arithmetically, with actual yen figures at ¥10M, ¥100M, and ¥500M income, so you have numbers you can defend in a board deck, not a range pulled from a summary page.

For context on how entity type affects these obligations from the start, see the KK vs GK vs Branch vs Representative Office: Complete Entity Comparison for Foreign Companies in Japan (2025).

How Japan Classifies Foreign Companies for Corporate Tax Purposes

Japan tax law divides corporations into resident (domestic) and non-resident (foreign) entities. A KK or GK incorporated in Japan is a resident corporation taxed on worldwide income. A foreign company operating through a registered branch (PE) is taxed only on Japan-source income attributable to that PE. This classification determines whether all three tax tiers apply in full or in part.

Getting this right before incorporation isn't academic: it determines the scope of every obligation covered in this guide. A resident corporation pays national corporate tax on global profits, including overseas service income, royalties from foreign sources, and cross-border dividends. A PE branch pays only on what's attributable to Japan operations. For a holding structure or IP-licensing entity, the gap between these two bases can be substantial.

Resident vs. Non-Resident: The KK/GK vs. Branch Distinction

A KK (Kabushiki Kaisha) or GK (Godo Kaisha) incorporated under Japanese law is a resident corporation. Per PwC (2025), resident corporations are subject to Japanese corporate tax on worldwide income, including overseas business profits, cross-border service income, and royalties from abroad. All three tax tiers apply in full.

A foreign corporation operating through a registered branch holds PE (permanent establishment) status. Per PwC (2025), a foreign corporation with a PE in Japan is liable for corporate income taxes only on income attributable to that PE. Enterprise tax and corporate resident tax still apply, but only against the PE's income base. The scope is narrower; the compliance machinery is nearly identical.

One common misconception: a branch doesn't simplify the tax structure. It narrows the income base, but you still file national and local returns, still face the three-tier rate structure on PE income, and still need a registered address and tax agent. For most operating businesses, the branch doesn't reduce compliance costs materially. See the Foreign Company Registration vs. Japan Subsidiary: Tax, Compliance, and Operational Tradeoffs comparison for a fuller analysis.

One genuine advantage of the KK/GK structure: dividend exemption. PwC (2025) confirms that 95% of dividends received by a domestic corporation from a foreign company in which it has held at least 25% of shares for six or more continuous months can be excluded from taxable income. Branches don't access this exemption in the same way: which matters for fund structures and holding companies with substantial cross-border dividend flows.

Tax Treaty Overrides and PE Determination

Japan has concluded more than 80 tax treaties and agreements, covering well over 100 jurisdictions. These treaties can override domestic PE rules, narrowing or expanding what constitutes a PE depending on the treaty text. A foreign company that sells into Japan through an agent, maintains a server, or seconds employees may trigger PE status under domestic rules even without a registered branch.

Treaty benefits are not automatic. The appropriate claim forms must be filed with the NTA proactively. Failure to document treaty positions before the return is filed, not after an audit, is a common and expensive mistake for first-year foreign entities. JETRO (2025) notes that from the business year commencing on or after April 1, 2016, Japanese branches of foreign corporations are deemed independent entities and taxed on attributable income on an arm's-length basis, consistent with OECD transfer pricing principles.

Mandatory Tax Agent Requirement for Foreign Entities

Any foreign corporation required to file Japanese tax returns must appoint a tax agent (納税管理人), typically a Japan-registered tax accountant (税理士) or corporate representative physically based in Japan. This isn't optional.

JETRO (2025) confirms a critical 2022 rule change: after January 1, 2022, if a corporation required to appoint a tax agent fails to submit a notification, the director of the competent tax office can designate a related party in Japan as the tax agent without the corporation's consent. That designated party then bears legal filing and payment obligations. Don't let the NTA make this choice for you.

The Three-Tier Corporate Tax System in Japan: Layer-by-Layer Breakdown

Japan's corporate tax system has three tiers: (1) national corporate tax at 23.2% (or 15–17% on the first ¥8M for qualifying SMEs), (2) national local corporate tax at 10.3% of the corporate tax amount, and (3) local taxes split into corporate resident tax: a per-capita levy plus an income-proportional levy, assessed at both prefectural and municipal levels, and enterprise tax, income-based for SMEs and size-based for large companies. From fiscal years beginning on or after 1 April 2026, the Defense Special Corporate Tax adds a fourth national line item. Each tier has a different legal basis, a different filing authority, and different deductibility treatment.

The structure matters even if the total rate is what ends up on your P&L. Enterprise tax is deductible next year. The per-capita resident tax levy hits loss-making companies. The national local corporate tax compounds on the national corporate tax amount, not on income, meaning rate changes at Tier 1 cascade automatically into Tier 2. Understanding the mechanics lets you model cash flow rather than accrue a round-number estimate.

Tier 1, National Corporate Tax (法人税)

The standard national corporate tax rate is 23.2% for companies with paid-in capital over ¥100 million (PwC, 2025). This is the anchor rate, every other tier either builds on it or references it.

For SMEs, companies with paid-in capital of ¥100 million or less, the preferential rate on the first ¥8 million of annual taxable income is 15%. If total annual income exceeds ¥1 billion, that reduced rate rises to 17%. The statutory permanent rate above ¥8 million is 19% for qualifying SMEs, though many projections default to the 23.2% large-company rate for simplicity. Don't do that if your entity genuinely qualifies: the difference is material at early-stage income levels.

One critical 2025 update: under the 2025 Tax Reform Act, preferential SME tax rates do not apply to companies using the group tax relief system (PwC, 2025). Foreign-owned KKs that are wholly owned subsidiaries of a large foreign parent applying consolidated or group tax rules should verify whether this exclusion applies before assuming SME rates.

The SME qualification has two structural gates: paid-in capital of ¥100M or less, and not being wholly owned by a company (or group) with paid-in capital of ¥500M or more. On top of that, the income test above adjusts the reduced rate itself, 15% normally, 17% when annual income exceeds ¥1B. A foreign parent with substantial capital must check the ownership gate carefully. Many Tokyo-registered foreign-owned KKs fail it and unknowingly lose the SME rate.

Tier 1 Addendum, Defense Special Corporate Tax (防衛特別法人税) from FY2026

Enacted in the 2025 tax reform, the Defense Special Corporate Tax applies to fiscal years beginning on or after 1 April 2026 (PwC, 2026; Grant Thornton, 2026). The mechanics: 4% of the national corporate tax amount after deducting a ¥5 million annual credit. Two practical consequences follow.

First, small companies are largely shielded: if your national corporate tax is ¥5 million or less, the surtax is zero. Second, for larger companies it raises the combined statutory effective rate by roughly 0.8–0.9 percentage points, from approximately 30.6% to 31.5% for corporations subject to size-based enterprise tax, and from approximately 34.6% to 35.4% for those that are not (PwC, 2026). Like the national local corporate tax, it is a tax-on-a-tax filed with the NTA, so any Tier 1 deduction reduces it proportionally.

Tier 2, National Local Corporate Tax (地方法人税)

This is where most foreign CFOs get confused, and the confusion is understandable. Despite its name, the national local corporate tax is paid to the national government (NTA), not to a local authority. It is a surcharge on the national corporate tax liability, not an independent tax on income.

The mechanics: calculate your national corporate tax first, then multiply that amount by 10.3%. That product is your national local corporate tax. Introduced in 2014 to fund local tax equalization and adjusted periodically since, the current rate of 10.3% applies to fiscal years beginning on or after 1 October 2019 and is confirmed unchanged for fiscal years from 1 April 2025 (PwC, 2025).

Why this matters arithmetically: if your national corporate tax changes, because of a rate change, a deduction, or an SME rate applying to part of your income, your national local corporate tax changes automatically in proportion. It's a tax-on-a-tax, not a tax-on-income. That structural difference affects how you model the impact of deductions and rate changes across tiers.

Tier 3A, Corporate Resident Tax (法人住民税): Per-Capita and Income-Proportional Levies

Corporate resident tax has two completely distinct components, operating simultaneously at two different government levels. Most English-language guides bury this detail or skip it entirely.

Component 1: Per-capita levy (均等割). This is a flat annual fee based on the company's paid-in capital and employee headcount. It has nothing to do with income. A loss-making company with zero taxable income still owes it. Rates vary by bracket: a small KK in Tokyo's 23 wards with capital under ¥10M and 50 or fewer employees pays ¥70,000 per year combined (¥20,000 prefectural + ¥50,000 municipal) (JETRO, 2025). Larger capital brackets attract higher levies, up to roughly ¥3.8M combined for the largest companies.

Component 2: Income-proportional levy (法人税割). Calculated as a percentage of the national corporate tax amount, not of income. The standard rates are 1.0% prefectural and 6.0% municipal (7.0% combined). Tokyo's 23 wards apply a combined super rate (超過税率) of 10.4% where paid-in capital exceeds ¥100M or the annual corporate tax amount exceeds ¥10M; companies below both thresholds pay the 7.0% standard rate. Confirm the current schedule with the Tokyo Metropolitan Government tax bureau, as these rates are periodically revised.

Both components are assessed at two levels simultaneously: the prefectural level (都道府県) and the municipal level (市町村). In Tokyo's 23 wards, the Tokyo Metropolitan Government handles both, which simplifies filing slightly, but it remains two separate line items on the same return. Foreign finance teams that read "resident tax" as a single number are almost always missing this two-level, two-component structure.

Tier 3B, Enterprise Tax (事業税) and Special Corporate Business Tax

Enterprise tax is a prefectural tax on business activity, but how it's calculated depends entirely on whether your company qualifies as an SME or a large enterprise.

For SMEs (paid-in capital ≤ ¥100M), enterprise tax is income-based: graduated rates of 3.5%, 5.3%, and 7.0% across income brackets at the standard schedule (JETRO, 2025). Tokyo applies higher-than-standard super rates; confirm current figures directly with the Tokyo Metropolitan Government tax bureau.

For large companies (paid-in capital > ¥100M), enterprise tax is size-based, calculated across three factors: income (~1.0% standard), value-added at ~1.2% (including personnel costs, net interest paid, and rent), and capital at ~0.5%. This is the critical point PwC (2025) makes explicitly: loss-making large enterprises may still owe enterprise tax because the value-added and capital bases don't require positive income. A large KK burning cash still has employees, office rent, and capital, all of which attract tax.

From fiscal years beginning on or after 1 April 2025 (a 2024 tax reform measure), companies subject to size-based enterprise tax in the previous fiscal year remain subject to it if total paid-in capital and capital surplus exceeds ¥1 billion, regardless of current paid-in capital (PwC, 2025). This closes a previous planning technique where companies reduced nominal paid-in capital to fall below the ¥100M threshold.

The deductibility rule is the most operationally important feature of enterprise tax: enterprise tax paid in a given year is deductible from the national corporate tax base in the year it is paid, not the year it was accrued. This creates a timing asymmetry that materially affects Year 1 vs. Year 2 effective rates for newly incorporated entities, addressed in detail in the worked examples below.

Special Corporate Business Tax (特別法人事業税) is an additional national levy calculated on the enterprise tax amount itself and collected through the enterprise tax return. The rates are concrete: 37% of the standard-rate income-based enterprise tax for ordinary corporations (SMEs), and 260% of the standard-rate income levy for corporations subject to size-based taxation (Ministry of Internal Affairs and Communications schedules).

Worked Examples: Calculating the Combined Effective Corporate Tax Rate in Japan

For a Tokyo-registered KK, the combined Year 1 effective corporate tax rate is approximately 25–26% at ¥10M taxable income (SME rates apply), roughly 35–38% at ¥100M, and roughly 36–39% at ¥500M, where size-based enterprise tax and Tokyo's 10.4% super resident-tax rate apply. Steady-state rates run several points lower once enterprise-tax deductibility enters the cycle, closer to the statutory composite of ~31.5% (size-based) to ~35.4% (non-size-based). The differences between income levels aren't flat scaling: the SME preferential rate, the Tokyo super rate thresholds, and the enterprise tax deductibility rule produce non-linear effective rates that must be modeled, not estimated.

The three worked examples below use Tokyo rates and assume: (a) fiscal year end March 31, (b) company registered in Tokyo 23 wards, (c) one office location, (d) no tax losses carried forward, (e) Year 1 filing (no prior-year enterprise tax deduction), and (f) a fiscal year beginning on or after 1 April 2026, so the defense surtax applies where corporate tax exceeds the ¥5M credit. Tokyo applies higher-than-standard resident and enterprise tax rates; always confirm current rates with the Tokyo Metropolitan Government tax bureau. These figures are illustrative, not a substitute for entity-specific professional advice.

Example A, Small Foreign-Owned KK (¥10M Taxable Income, Tokyo, SME Qualifying)

Assume a Tokyo-registered KK with paid-in capital of ¥5M, five employees, and ¥10M taxable income. The SME preferential rate applies.

Step 1, National Corporate Tax: 15% × ¥8,000,000 + 19% × ¥2,000,000 = ¥1,200,000 + ¥380,000 = ¥1,580,000. (PwC (2025) confirms 15% on the first ¥8M and 19% above for qualifying SMEs.)

Step 2, Defense Special Corporate Tax: The corporate tax amount (¥1,580,000) is below the ¥5M credit, so the surtax is ¥0. Most genuinely small companies will not feel this levy.

Step 3, National Local Corporate Tax: 10.3% × ¥1,580,000 = ¥162,740. Filed with and paid to the NTA despite the "local" label.

Step 4, Prefectural Resident Tax, Per Capita: For a company with capital under ¥10M and 50 or fewer employees, the Tokyo prefectural per-capita levy is ¥20,000.

Step 5, Prefectural Resident Tax, Income Proportional: With capital under ¥100M and corporate tax under ¥10M, the standard rate applies: 1.0% × ¥1,580,000 = ¥15,800.

Step 6, Municipal Resident Tax, Per Capita: For the same bracket in Tokyo 23 wards, ¥50,000.

Step 7, Municipal Resident Tax, Income Proportional: 6.0% × ¥1,580,000 = ¥94,800.

Step 8, Enterprise Tax (income-based, Tokyo rates): At ¥10M taxable income, enterprise tax plus Special Corporate Business Tax (37% of the standard-rate amount) totals approximately ¥600,000–¥700,000 at Tokyo rates. Confirm exact current brackets with the Tokyo Metropolitan Government.

Total tax: approximately ¥2.5M–¥2.6M on ¥10M income = effective rate ~25–26%.

That's a meaningful discount from the 30–35% headline. A small foreign-owned KK that genuinely qualifies for SME rates should model this properly: the difference between ~25% and ~34% on ¥10M taxable income is roughly ¥0.9M in cash, and the defense surtax widens the gap further because small companies escape it entirely.

Example B, Mid-Size KK (¥100M Taxable Income, Tokyo, Large Company Rates)

Assume a Tokyo-registered KK with paid-in capital of ¥150M (above the SME threshold), 30 employees, and ¥100M taxable income. Large company rates apply throughout.

Step 1, National Corporate Tax: 23.2% × ¥100,000,000 = ¥23,200,000.

Step 2, Defense Special Corporate Tax: 4% × (¥23,200,000 − ¥5,000,000) = ¥728,000 (fiscal years beginning on or after 1 April 2026).

Step 3, National Local Corporate Tax: 10.3% × ¥23,200,000 = ¥2,389,600.

Step 4, Prefectural Resident Tax, Per Capita: For the capital ¥100M–¥1B bracket, ¥130,000 (prefectural).

Step 5, Prefectural Resident Tax, Income Proportional: Capital exceeds ¥100M, so Tokyo's super rate applies: 2.0% × ¥23,200,000 = ¥464,000.

Step 6, Municipal Resident Tax, Per Capita: Same capital bracket, 50 or fewer employees: ¥160,000 (municipal, Tokyo 23 wards).

Step 7, Municipal Resident Tax, Income Proportional: 8.4% × ¥23,200,000 = ¥1,948,800. (Tokyo's combined 10.4% super rate splits as 2.0% prefectural + 8.4% municipal.)

Step 8, Enterprise Tax (size-based, three-factor): With capital above ¥100M, size-based enterprise tax applies automatically: it is not optional or facts-dependent. The income levy (~1.0% standard) plus Special Corporate Business Tax (260% of the standard income levy) contribute roughly ¥3.6M–¥3.8M; the value-added levy (~1.2% on personnel costs, net rent, net interest, and income) and capital levy (~0.5% × ¥150M) add the rest, depending heavily on payroll and rent. A realistic total range: ≈¥6,500,000–¥9,500,000.

Total tax: approximately ¥35M–¥38M on ¥100M income = effective rate ~35–38% in Year 1.

In Year 2, the enterprise tax paid in Year 1 becomes deductible from the national corporate tax base. On ¥8M of enterprise tax deducted, the national corporate tax saving is approximately ¥1.9M (at 23.2%), with the defense surtax, national local corporate tax, and income-proportional resident tax dropping proportionally, a total Year 2 improvement of roughly 2 percentage points. Not transformative, but real cash.

Example C, Large KK (¥500M Taxable Income, Tokyo, Size-Based Enterprise Tax)

Assume ¥500M taxable income, paid-in capital of ¥2B, and more than 50 employees. Size-based enterprise tax applies. The income component remains, but the value-added component (personnel costs + net rent + net interest) and the capital component add to the base, regardless of whether those bases are "profitable."

Step 1, National Corporate Tax: 23.2% × ¥500,000,000 = ¥116,000,000.

Step 2, Defense Special Corporate Tax: 4% × (¥116,000,000 − ¥5,000,000) = ¥4,440,000.

Step 3, National Local Corporate Tax: 10.3% × ¥116,000,000 = ¥11,948,000.

Step 4, Prefectural Resident Tax, Per Capita: Capital ¥1B–¥5B bracket, approximately ¥540,000 (rising to ¥800,000 above ¥5B).

Step 5, Prefectural Resident Tax, Income Proportional: 2.0% × ¥116,000,000 = ¥2,320,000 (Tokyo super rate).

Step 6, Municipal Resident Tax, Per Capita: Large bracket with more than 50 employees, approximately ¥1,750,000 (rising to ¥3,000,000 for capital above ¥5B).

Step 7, Municipal Resident Tax, Income Proportional: 8.4% × ¥116,000,000 = ¥9,744,000 (Tokyo super rate).

Step 8, Enterprise Tax (size-based, three-factor, Tokyo): The three-factor calculation, income rate (~1.0% standard), value-added rate (~1.2%), capital rate (~0.5%), plus Special Corporate Business Tax at 260% of the standard income levy produces a substantially higher enterprise tax burden than income-alone calculations suggest. For a company at this scale with substantial headcount and Tokyo office space, total enterprise tax including SCBT is approximately ¥35M–¥50M depending on the actual value-added and capital bases.

Total tax: approximately ¥182M–¥197M on ¥500M income = effective rate ~36–39% in Year 1 (moderating in steady state as enterprise tax deductibility enters the cycle).

A loss-making entity at this scale is the worst-case scenario. Zero taxable income means zero national corporate tax, zero defense surtax, zero national local corporate tax, and zero income-proportional resident tax. But the per-capita resident tax levies remain. And the value-added and capital components of enterprise tax remain. A large KK burning ¥200M in cash can still owe ¥10M–¥20M in local taxes purely from its payroll, rent, and capital base.

The Enterprise Tax Deductibility Loop: Why Year-Two Math Differs from Year-One

Enterprise tax is accrued in the year earned but deductible in the year paid. In Japan, corporate tax returns are filed, and enterprise tax is paid, within two months of fiscal year end. So enterprise tax accrued in Year 1 is paid in Month 2 of Year 2 and deducted from the national corporate tax base in Year 2.

In Year 1, your national corporate tax base includes no prior enterprise tax deduction. Starting in Year 2, it does. For a mid-size KK paying ¥8M in enterprise tax annually, the Year 2 national corporate tax base drops by ¥8M, saving approximately ¥1.9M at the 23.2% rate. The defense surtax and national local corporate tax drop proportionally. Income-proportional resident tax levies also drop. The total Year 2 saving is roughly ¥2.2M–¥2.5M: a permanent annual benefit once the enterprise tax deduction is in the cycle.

Your company's effective tax rate in Year 1 is always higher than in steady state. Foreign CFOs building three-year financial models for a new Japan entity should account for this explicitly. The Year 1 effective rate is not representative, and if you're presenting to a board or LP committee, that footnote matters.

Filing, Payment, and Compliance Obligations for Foreign-Owned Entities

Corporate tax returns in Japan are filed annually with the National Tax Agency within two months of the fiscal year end. Local taxes, corporate resident tax and enterprise tax, are filed separately with the relevant prefectural and municipal tax offices. Foreign-owned KKs must appoint a tax agent. Interim payments are required if the prior year's national corporate tax exceeded ¥200,000: the interim amount is half the prior year's tax, due whenever that half exceeds ¥100,000, and official notices arrive by post to the registered address. Missed mail equals missed deadlines.

The compliance calendar for a Japan entity involves multiple returns, multiple authorities, and multiple payment deadlines across national and local levels. Treating Japan tax compliance as a single annual event with the NTA is one of the most common operational failures of foreign-operated entities.

National Tax Filing: NTA Deadlines and e-Tax Requirements

The standard filing window is two months from the fiscal year end. For a March 31 fiscal year, the deadline is May 31; for a December 31 year, it's the last day of February (PwC, 2025; NTA, 2025). The NTA accepts filings via e-Tax, Japan's electronic tax filing platform, and most corporate filers use this system.

Extensions are available but not automatic. Companies with unavoidable delays in finalizing accounts can apply for a one-month extension on the national return. The extension doesn't defer the payment due date, tax must be estimated and paid on time even if the return is filed late. Late payment attracts interest at the statutory rate plus surcharges that compound quickly on large balances.

For more detail on corporate tax in Japan, including filing procedures and rate schedules, the AQ Partners blog covers current NTA requirements. Also see the Japan Tax Compliance for Foreign Companies: Essential Requirements by Company Stage for a stage-by-stage compliance roadmap.

Local Tax Filing: Prefectural and Municipal Returns

Separate returns must be filed with the prefectural and municipal tax offices for corporate resident tax and enterprise tax. These are distinct legal obligations from the national return, different forms, different authorities, and in some prefectures, different deadlines (though most align with the national two-month window).

In Tokyo's 23 wards, the Tokyo Metropolitan Government serves as both the prefectural and municipal authority, so one local return covers both prefectural and municipal resident tax obligations. Outside Tokyo, or in cities outside the 23-ward area, separate filings may be required. Companies with offices in multiple prefectures must file local returns in each prefecture where they have an establishment and apportion income across them using a prescribed formula.

Interim (Provisional) Tax Payments

If a company's prior year national corporate tax liability exceeded ¥200,000, it must make an interim (provisional) tax payment during the current fiscal year: the interim amount equals one-half of the prior year's annual tax and is due within two months after the end of the sixth month (PwC, 2025). The same obligation applies to local taxes, both resident tax and enterprise tax, with the relevant prefectural and municipal offices.

This is often a cash-flow surprise for first-year entities whose second half sees strong revenue growth. The interim payment is based on the prior year, not current performance, so a company that doubles revenue in Year 2 still pays a Year 1-based interim amount, with the balance due at year-end. The reverse is also true: a company whose revenue falls sharply can elect to use an actual calculation method for the interim payment rather than the prior-year method, but this requires a separate election and return.

Registered Address, Tax Agent, and the Postal Risk

This is the most underappreciated operational risk for foreign-owned entities in Japan. Official tax notices, assessment notices, demand letters, audit appointment letters, penalty notices, are sent by post to the company's registered address. Even when filing electronically via e-Tax, many official notices and payment slips continue to arrive physically by post, in Japanese.

Foreign companies with a virtual office registered address, a part-time representative, or an outsourced agent who doesn't forward mail in real time are one missed envelope away from a compliance failure. Japan's tax authorities don't call. They mail, in Japanese. A letter sitting in a mailbox for three weeks is not a valid defense against the resulting late payment surcharge.

The mandatory tax agent requirement exists precisely for this reason. A Japan-based tax accountant (税理士) with proper engagement terms will receive, translate, and act on official notices as part of their mandate. Don't treat the appointment as a formality: it's the operational backbone of your compliance infrastructure. See the Compliance in Japan: Key Requirements and Obligations for Foreign Companies overview for broader context.

For foreign companies managing payroll and social insurance alongside tax filings, see the Payroll Setup Timeline for Foreign Companies in Japan: 10-Day Compliance Roadmap for parallel obligations that often intersect with the tax filing calendar.

Key Takeaways

Japan's corporate tax system is three legally separate obligations, national corporate tax, national local corporate tax, and local taxes (resident tax + enterprise tax), plus, from fiscal years beginning on or after 1 April 2026, a national defense surtax. Each has different rates, bases, and filing authorities. The combined effective rate for a Tokyo KK ranges from roughly 25% at low SME income levels to the high 30s for large companies in Year 1, and the enterprise tax deductibility rule means Year 2 effective rates differ from Year 1.

• Three tiers, four line items: Corporate resident tax in Japan is assessed as part of a three-tier system, national corporate tax, national local corporate tax, and local taxes (corporate resident tax + enterprise tax). Corporate resident tax itself has four sub-components: per-capita prefectural, income-proportional prefectural, per-capita municipal, and income-proportional municipal.
• The defense surtax arrives with FY2026: For fiscal years beginning on or after 1 April 2026, a 4% Defense Special Corporate Tax applies to the corporate tax amount after a ¥5M credit, adding roughly 0.8–0.9 points to large-company effective rates while leaving most small companies untouched.
• The per-capita levy hits loss-makers: The 均等割 (per-capita) component of corporate resident tax is a flat levy based on capital and headcount, owed regardless of profitability. Budget for it from Day 1.
• National local corporate tax is a tax on a tax: The 10.3% national local corporate tax is calculated on the national corporate tax amount, not on income. Any deduction or rate change at Tier 1 automatically reduces Tier 2 proportionally.
• Enterprise tax deductibility creates a Year 1 / Year 2 timing difference: Enterprise tax paid in Year 2 (for Year 1 liability) is deductible from the Year 2 national corporate tax base. First-year effective rates are higher than steady-state; model this explicitly in multi-year projections.
• SME rates are valuable but often forfeited: A Tokyo KK with taxable income around ¥10M and qualifying SME status pays an effective rate roughly 8–10 percentage points lower than a large company, and escapes the defense surtax entirely. Foreign-owned subsidiaries of large parent companies often fail the capital ownership test and lose the SME rate unknowingly.
• Tokyo charges large companies a super rate: The income-proportional resident tax jumps from the 7.0% standard to a combined 10.4% in Tokyo's 23 wards once paid-in capital exceeds ¥100M or the corporate tax amount exceeds ¥10M.
• Large companies owe enterprise tax even at a loss: Size-based enterprise tax is assessed on value-added (including personnel costs and rent) and capital, not just income. A loss-making large KK can face meaningful local tax liabilities.
• The postal risk is real: All official tax correspondence arrives by post in Japanese. A missed notice at a virtual office address will generate penalties. Appoint a tax agent with active mail-handling responsibilities and confirm the engagement terms explicitly.
• Branches don't simplify much: A registered branch faces nearly the same three-tier structure on PE-attributable income, still requires a tax agent, and still files both national and local returns. The income base is narrower; the compliance infrastructure is nearly identical to a KK.

Frequently Asked Questions About Corporate Resident Tax in Japan

Common questions from foreign finance teams about Japan's corporate resident tax cover who pays it, how it is calculated, whether it applies to branches, how it differs from enterprise tax, and what happens when a company is loss-making. Each answer below is a standalone, citable response.

What is corporate resident tax in Japan and who pays it?

Corporate resident tax (法人住民税) is a local tax levied by prefectures and municipalities on corporations with offices or establishments in their jurisdiction. It applies to both domestic resident corporations (KKs and GKs) and foreign corporations operating through a registered PE (branch). It has two components: a flat per-capita levy (均等割) based on the company's capital size and employee headcount, and an income-proportional levy (法人税割) calculated as a percentage of the national corporate tax amount. Both components are assessed simultaneously at the prefectural and municipal levels, producing up to four separate line items on the local tax return. The per-capita component is owed regardless of whether the company is profitable.

How is the corporate resident tax rate calculated in Japan?

The income-proportional component is calculated using the following formula: Income-proportional resident tax = National corporate tax amount × (prefectural rate + municipal rate). Standard rates are 1.0% prefectural and 6.0% municipal: a combined 7.0% of the national corporate tax figure. In Tokyo's 23 wards, a combined super rate of 10.4% applies where paid-in capital exceeds ¥100M or the annual corporate tax amount exceeds ¥10M. On a national corporate tax liability of ¥23.2M (from ¥100M taxable income at 23.2%), the income-proportional resident tax is approximately ¥1.6M at the standard rate or ¥2.4M at the Tokyo super rate. The per-capita component is a fixed annual amount determined by the company's capital bracket and employee count, from ¥70,000 combined for a small Tokyo entity up to several million yen for a large one. Always confirm current Tokyo Metropolitan Government rates directly, as they differ from national standard rates.

Does corporate resident tax apply to foreign companies operating through a branch in Japan?

Yes. A foreign corporation with a registered branch (PE) in Japan is subject to corporate resident tax on the same basis as a domestic entity, applied to income attributable to that PE. The per-capita levy applies based on the branch's capital allocation and employee headcount in Japan. The income-proportional levy applies to the national corporate tax calculated on PE-attributable income. Filing obligations, with the prefectural and municipal tax offices, are identical to those of a resident KK or GK. A branch does not reduce the corporate resident tax obligation; it only narrows the income base on which the income-proportional components are calculated.

What is the difference between corporate resident tax and enterprise tax in Japan?

Corporate resident tax (法人住民税) and enterprise tax (事業税) are two distinct local taxes, often confused because both are filed with prefectural and municipal authorities. Corporate resident tax is a surcharge calculated primarily as a percentage of the national corporate tax amount: it funds local government services and is proportional to the national tax liability. Enterprise tax is a separate prefectural tax assessed directly on business income (for SMEs) or on income, value-added, and capital (for large companies). The critical operational difference: enterprise tax paid in a given year is deductible from the national corporate tax base the following year. Corporate resident tax is not deductible in the same way. Large companies may owe enterprise tax even at a loss due to the value-added and capital components; the income-proportional component of corporate resident tax is zero when national corporate tax is zero, though the per-capita component remains.

Can a company owe corporate resident tax in Japan even if it has no taxable income?

Yes, specifically through the per-capita (均等割) component. This flat annual levy is determined entirely by the company's paid-in capital and employee headcount, assessed regardless of taxable income, operating profit, or revenue. A newly incorporated KK with zero revenue still owes the per-capita resident tax at both the prefectural and municipal levels. For a small company with capital under ¥10M, the combined annual per-capita levy in Tokyo is ¥70,000. For the largest companies, the combined levies can reach roughly ¥3.8M annually. The income-proportional component is zero when there is no national corporate tax liability, but the per-capita amount remains fixed throughout the life of the entity.

What is the effective corporate tax rate in Japan for a small foreign-owned KK?

A qualifying SME KK with paid-in capital of ¥100M or less, not wholly owned by a large parent company, pays national corporate tax at 15% on the first ¥8M of taxable income. Adding 10.3% national local corporate tax on that amount, plus income-proportional and per-capita resident tax, plus income-based enterprise tax at Tokyo rates, the combined effective rate for a ¥10M income entity is approximately 25–26%, and the new defense surtax typically does not apply, because the corporate tax amount falls below the ¥5M credit. This is meaningfully lower than the headline rate for large companies. The SME qualification gates matter: a foreign-owned KK that is a wholly owned subsidiary of a foreign parent with paid-in capital of ¥500M or more typically fails the ownership test and pays large-company rates from Day 1, regardless of the Japan entity's own capital amount (PwC, 2025).

When are corporate tax returns due in Japan for a foreign-owned company?

The standard deadline for the national corporate tax return is two months from the company's fiscal year end, May 31 for a March 31 fiscal year, or the last day of February for a December 31 year end (NTA, 2025). A one-month extension may be available for companies that cannot finalize accounts within two months, but it must be applied for in advance and does not defer the tax payment due date. Local tax returns, for corporate resident tax and enterprise tax, follow the same deadline but are filed separately with the prefectural and municipal tax offices (or the Tokyo Metropolitan Government for Tokyo 23-ward entities). Interim tax payments are due for companies whose prior-year national corporate tax exceeded ¥200,000, with the half-year interim amount payable within two months after the sixth month of the fiscal year. For a full breakdown of Japan's fiscal year and tax filing schedule and important dates, including interim payment deadlines, see the AQ Partners tax calendar guide.

Working with AQ Partners. Our Tokyo team provides back office operations for foreign companies operating in Japan, covering the requirements described above end to end. Book a consultation to discuss your situation.

Sources

• PwC (2025–2026). Japan – Corporate – Taxes on Corporate Income. PwC Worldwide Tax Summaries., Corporate tax rates, SME rates, national local corporate tax, defense special corporate tax, size-based enterprise tax rules, dividend exemption, effective rate composites.
• JETRO (2025). Section 3.3 Overview of Corporate Income Taxes (Corporate Tax, Corporate Inhabitant Tax, Enterprise Tax). Setting Up Business in Japan. Japan External Trade Organization., Rate tables, per-capita inhabitant tax amounts, enterprise tax brackets, branch taxation on an arm's-length basis, tax agent rules.
• National Tax Agency of Japan (2025). Corporation Income Tax (English). NTA., Filing deadlines, e-Tax, interim payment obligations.
• Grant Thornton Japan (2026). Defense Special Corporate Tax – Deferred Tax Impact. Tax Bulletin, January 2026., Defense surtax mechanics (4% of corporate tax after ¥5M credit, FYs from 1 April 2026).
• EY (2025). Japan | 2025 Tax Reform for Corporate and International Taxation. EY Global Tax Alert., 2025 reform measures including SME rate conditions and defense surtax enactment.