Corporate Tax as Indirect Tax — How the Defense Surtax Reaches Citizens' Wallets
In April 2026, Japan's Defense Special Corporate Tax took effect — a 4% surtax on base corporate tax liability. Framed as a tax on corporations, its burden ripples through to citizens via price pass-through, supply chain pressure, and a 10-year extension of the reconstruction surtax. This article traces the structural pathways through which the ¥43.5 trillion defense plan's three funding pillars reach household budgets.
TL;DR
- The Defense Special Corporate Tax, effective April 2026, adds 4% to base corporate tax liability, targeting ~¥771 billion in full-year revenue
- Corporate tax burdens pass through to consumers via price increases and supply chain pressure — 'taxing corporations, not citizens' does not hold
- The income surtax extends the reconstruction tax end date by 10 years, functioning as a hidden tax increase despite zero net impact on annual take-home pay
What Is Happening
The Defense Special Corporate Tax took effect in April 2026, marking the start of serious revenue mobilization for the ¥43.5 trillion defense plan
On April 1, 2026, the Defense Special Corporate Tax took effect. The mechanism is straightforward: a 4% surtax applied to the base corporate tax liability minus a ¥5 million deduction.
The formula:
Defense Special Corporate Tax = (Base Corporate Tax Liability − ¥5 million) × 4%
"Base corporate tax liability" refers to the corporate tax amount before deductions for foreign tax credits, income tax credits, and similar adjustments. The ¥5 million basic exemption was designed as a concession to small and medium enterprises. Corporations with a base tax liability of ¥5 million or less file a zero return. For a company with a ¥6 million base liability, the additional burden amounts to just (¥6M − ¥5M) × 4% = ¥40,000.
Behind this tax lies the Defense Capability Development Plan approved by the Cabinet in December 2022: a commitment to ¥43.5 trillion in total defense spending over the five years from FY2023 to FY2027. Defense-related expenditure in FY2025 reached ¥8.7005 trillion, approximately 1.8% of GDP. Since FY2022, when the figure stood at ¥5.4 trillion, defense spending has expanded by roughly ¥1 trillion annually.
The revenue plan rests on three pillars.
Three Pillars of Defense Tax Increases
Target: Over ¥1 trillion secured by FY2027
Base corporate tax × 4% (after ¥5M deduction)
Income tax × 1% (offset by 1% reconstruction tax cut)
Phased increase on heated tobacco products
* Income surtax is offset by a 1% cut in reconstruction surtax, resulting in zero net reduction in take-home pay per year. However, the reconstruction tax end date is extended 10 years: from end of 2037 to end of 2047
The first pillar is the Defense Special Corporate Tax — the subject of this article. NTA projections estimate revenue of approximately ¥528 billion in the first year (FY2026), rising to ¥821 billion in FY2027, and settling at approximately ¥771 billion in a full fiscal year.
The second pillar is the Defense Special Income Tax: a 1% surtax on income tax beginning January 2027. To offset this, the reconstruction surtax rate is reduced from 2.1% to 1.1%, theoretically leaving annual take-home pay unchanged. The structural significance of this design is examined below.
The third pillar involves phased increases in tobacco tax, beginning April 2026, progressively raising tax rates on heated tobacco products toward parity with conventional cigarettes.
According to estimates by Venture Ink Accounting, the statutory effective tax rate for corporations subject to the size-based enterprise tax in Tokyo's 23 wards rises from 30.62% to 31.52% — an increase of roughly 0.9 percentage points. A seemingly modest number, but in the realm of corporate accounting, 0.9% of profit margins is far from trivial.
Background and Context
Political dynamics behind prioritizing corporate over income tax, NATO's GDP 2% benchmark, and how other nations fund defense expansion
Why Corporate Tax Came First
The sequencing of the three pillars reflects political calculation.
According to analysis by NRI (Nomura Research Institute) analyst Takahide Kiuchi, the Kishida administration faced "fierce resistance" from within the LDP against income tax increases. The political imperative to avoid "a burden broadly shared by the public" drove the decision to lead with corporate tax and defer income tax. A corporate levy can be framed as "taxing companies," sidestepping direct voter backlash.
This "drift" persisted for years. The LDP-Komeito decision in December 2024 left the income tax start date unspecified. Only in the December 2025 tax reform outline was a January 2027 start confirmed. The pattern of setting the spending target first and scrambling for revenue afterward has drawn criticism from the standpoint of fiscal democracy.
The International Context of GDP 2%
NATO's GDP 2% target is frequently cited as justification for Japan's defense buildup.
According to NATO, all 32 member nations met the GDP 2% target in 2025 — up from just three in 2014. This transformation testifies to the seismic shift in security calculus triggered by Russia's invasion of Ukraine. The European-Canadian average reached 2.3% of GDP.
SIPRI (Stockholm International Peace Research Institute)'s 2026 report places Japan's 2025 military expenditure at $62 billion, a 9.7% year-on-year increase, bringing spending to 1.4% of GDP — the highest level since 1958.
Critically, nations differ in how they fund defense expansion. Germany chose to amend its constitution, exempting defense from its federal debt brake, and established a €100 billion Bundeswehr special fund. It opted for debt rather than taxation. Japan's choice of the tax route is precisely that — a choice, not a necessity.
Continuing "Closing Libraries, Digging Shelters"
The companion piece, "Closing Libraries, Digging Shelters," examined the asymmetry between defense expansion and cultural budget cuts. This article addresses the revenue side of that equation.
FY2025 General Account: Major Expenditure Comparison
General account total: ¥115.5T
New defense revenue: Defense Corporate Surtax (full-year ~¥771B)
← Effective tax rate 30.62% → 31.52% (~+0.9%)
In the FY2025 general account, the ¥8.7 trillion defense budget stands at 2.1 times the ¥4.1 trillion education budget and roughly 82 times the Agency for Cultural Affairs' ¥106.2 billion. Social security expenditure of ¥38.2778 trillion faces annual "natural increase" compression of approximately ¥130 billion. The structure is one of levying new taxes for defense while cutting social security.
Reading the Structure
Tracing the pass-through from corporate tax to consumers, the hidden reconstruction tax extension, and the fiscal democracy question
Does Corporate Tax Stay with Corporations?
The Defense Special Corporate Tax is presented as "a levy on corporations with the capacity to bear it." Yet the ultimate bearer of a corporate tax is not necessarily the corporation itself.
As Hirose Comprehensive Accounting observes, the increased corporate tax burden can reach consumers through multiple channels.
The first channel is price pass-through. Corporate tax is generally considered difficult to pass through to retail prices, but in practice, pass-through depends on the competitive structure of each industry. In price-regulated sectors (rail, electricity, telecommunications), pass-through is constrained, meaning reduced profits translate into curtailed service investment. In unregulated sectors, firms may raise product and service prices to preserve margins.
The second channel is pressure flowing from large corporations to SME suppliers. The ¥5 million deduction effectively exempts SMEs with taxable income below approximately ¥24 million. However, when their large corporate clients face increased tax burdens, downward pressure on procurement prices and unit costs cascades through the supply chain. This dynamic is particularly pronounced in industries with deep subcontracting hierarchies: manufacturing, food processing, and construction.
In short, the equation "corporate tax = corporations pay = citizens don't" breaks down in the reality of supply chains. Tax burdens absorbed by corporations eventually reach someone's daily life — either through consumer prices or through wage suppression for employees.
The Reconstruction Tax Extension as Hidden Tax Increase
The second pillar — the income surtax — contains a carefully crafted design.
On the surface, reducing the reconstruction surtax from 2.1% to 1.1% while introducing a 1% defense surtax leaves the combined rate unchanged, with zero impact on annual take-home pay. But the price of this arrangement is that the reconstruction surtax's expiration date is extended from the end of 2037 to the end of 2047 — a 10-year extension.
The implication is clear. From 2038 onward, a tax that should have disappeared will continue for a decade. That "extension" effectively becomes a revenue source for defense spending. Hence the criticism: "a de facto diversion of reconstruction funds to military expansion."
Repurposing a special income tax established in response to the 2011 Great East Japan Earthquake as a defense revenue source 15 years later. This structural issue is invisible in single-year figures. The explanation that "your take-home pay won't decrease this year" is technically correct, but it obscures the full picture: 10 years of additional burden.
The Fiscal Democracy Question
As NRI's Kiuchi observes, the fundamental issue is that the scale of defense spending was decided first. The ¥43.5 trillion figure received Cabinet approval, and only then did the search for revenue begin. Whether to raise taxes or issue bonds, whether to start with corporate or income tax — all of it was determined after the spending target, not before.
Tokyo Law Office points to the simultaneity of defense budget expansion and compression of social security's natural increase. Preparedness against missiles and investment in poverty reduction, aging, and education. Both constitute expenditure "to protect citizens," yet who determined their relative priority, and through what process?
The Defense Special Corporate Tax generates ¥771 billion in annual revenue. That burden propagates along channels that resist easy visibility — from corporations to consumers, from large firms to small suppliers, and from the present generation to future ones. "Who decides, who pays?" The current institutional design does not convincingly answer this question.
Related Columns
- Closing Libraries, Digging Shelters — The Tradeoff Between Defense Expansion and Cultural Budget Cuts
- The Structure of Gasoline Double Taxation — The "Tax on Tax" Problem Persisting After Provisional Rate Abolition
Related Guides
References
Pamphlet on the Defense Special Corporate Tax — National Tax Agency. NTA
FY2025 Defense Budget Overview — Ministry of Defense, Japan. Ministry of Defense
What Is the Defense Special Corporate Tax? — freee. freee
Defense Budget Revenue Debate Derailed by Fierce Opposition to Tax Increases — Takahide Kiuchi. NRI
Defence Expenditure of NATO Countries (2014-2025) — NATO. NATO
SIPRI Fact Sheet: Trends in World Military Expenditure, 2025 — SIPRI. SIPRI
What's Wrong with Doubling Defense Spending? Three Concerns from the Perspective of Fiscal Democracy — imidas. imidas
