Japan's Defense Spending Exceeds

📡 THE SIGNAL — What Happened

Why it matters: The jump in defense spending from the 1% of GDP ceiling, maintained for 80 years since the end of the war, to 3% represents one of the largest structural shifts in Japan's security policy, marking a turning point that will fundamentally alter the military balance in East Asia, the nature of the Japan-U.S. alliance, and Japan's fiscal structure.

• Policy — The Japanese government is reportedly set to raise defense spending to over 3% of GDP in the FY2026 budget.
• History — Japan has maintained a policy of capping defense spending at 1% of GDP for approximately 50 years, since the Miki Cabinet in 1976.
• Policy Shift — The revision of the Three Security Documents (Anpo San Bunsho) in December 2022 set a target of achieving 2% of GDP by FY2027.
• Security Environment — North Korea has accelerated ballistic missile launches since 2022 and is proceeding with the operational deployment of solid-fuel ICBMs in 2025.
• Regional Situation — China's defense budget has reached approximately 1.67 trillion yuan (about 35 trillion yen) on a publicly announced basis, and is estimated to be even larger in reality.
• Alliance Relations — The U.S. is intensifying pressure on NATO and Indo-Pacific allies to increase defense spending to 3% of GDP or more.
• Fiscal Affairs — Japan's FY2025 defense budget is approximately 8.5 trillion yen, reaching about 1.5% of GDP (approximately 2% when converted to NATO standards).
• Industry — Stock prices of defense-related companies such as Mitsubishi Heavy Industries, Kawasaki Heavy Industries, and IHI have risen significantly since 2024.
• Public Opinion — Various public opinion polls show that a majority supports increased defense spending, but there is strong opposition to tax increases as a funding source.
• Diplomacy — Since 2024, Japan has expanded joint development of next-generation fighter jets (GCAP) with the UK and Italy, and defense cooperation with the Philippines.
• Funding Sources — As funding sources for increased defense spending, tax increases on corporate tax, income tax, and tobacco tax, diversion of construction bonds, and utilization of settlement surpluses are being considered.
• Equipment — With the acquisition of counter-strike capabilities (enemy base attack capabilities), mass production of long-range missiles and the development of integrated air and missile defense systems are underway.

The increase in Japan's defense spending to over 3% of GDP is not merely a change in budget figures. It is a structural transformation related to Japan's post-war national identity itself, and to understand its roots, one must unravel 80 years of historical context.

After its defeat in 1945, Japan, under Article 9 of its new constitution, renounced war and the possession of war potential, adopting the "Yoshida Doctrine" as the cornerstone of its national strategy, which relied on its alliance with the United States for security. This strategy, which focused resources on economic recovery, enabled remarkable economic growth throughout the Cold War. In 1976, the Takeo Miki Cabinet made a cabinet decision to keep defense spending within 1% of GNP, which became established domestically and internationally as a de facto "proof of a pacifist nation." Although the Yasuhiro Nakasone Cabinet abolished this framework in 1987, actual defense spending continued to hover around 1% thereafter.

This "1% ceiling" began to waver from the late 2010s. There are three direct triggers. First, China's rapid military modernization. China's defense budget has expanded approximately sevenfold over the past 20 years, and military activities in the East China Sea and South China Sea are escalating annually. Incursions by Chinese government vessels around the Senkaku Islands have become routine, and in 2024, the first confirmed intrusion of Japanese airspace by Chinese military aircraft occurred. Second, North Korea's dramatic improvement in nuclear and missile capabilities. North Korea is believed to possess hundreds of medium-range ballistic missiles capable of reaching all of Japan, and is also thought to have succeeded in miniaturizing nuclear warheads. Third, the reality of "changing the status quo by force" demonstrated by Russia's invasion of Ukraine (2022), which delivered a decisive shock to Japanese security policy planners.

However, the truly important structural factor is the transformation of U.S. security strategy. Since the first Trump administration (2017-2021), the U.S. has dramatically intensified its demands for "burden-sharing" from its allies. The 2% of GDP requirement for NATO has already been raised to 3% of GDP, and this pressure is spreading to Indo-Pacific allies. The second Trump administration in 2025 is explicitly demanding 3% of GDP from Japan, and there is a sense of crisis on the Japanese side that failure to comply could lead to a reduction of U.S. forces in Japan or a de facto hollowing out of the Japan-U.S. Security Treaty.

Domestically, politically, after the assassination of former Prime Minister Shinzo Abe in 2022, calls for strengthening defense capabilities as a "succession to the Abe line" grew even stronger among conservatives. The revision of the Three Security Documents and the 2% of GDP defense spending target announced by the Fumio Kishida administration at the end of 2022 are understood in this context. However, the 2% target came to be regarded as "insufficient" just three years after its establishment. The background to this includes the further deterioration of the international security environment due to the prolonged war in Ukraine, rising tensions over the Taiwan Strait, and increased pressure from the United States.

On the fiscal front, Japan carries the worst debt-to-GDP ratio among developed countries (approximately 260%), and a significant increase in defense spending creates a serious contradiction with fiscal discipline. However, the judgment that a security crisis takes precedence over fiscal discipline is becoming dominant within the government. This signifies a complete reversal of the Yoshida Doctrine, which once prioritized economic development over security during the period of rapid economic growth.

Geopolitically, Japan's defense spending exceeding 3% will have a significant impact on the military balance in East Asia. Japan's GDP is approximately 600 trillion yen, and 3% would amount to 18 trillion yen. This means Japan would surpass the defense expenditures of the UK and France, becoming the world's third-largest defense spender. For China, this change will be a cause for alarm as a qualitative strengthening of the Japan-U.S. alliance. For South Korea, it will create a complex equation where historical sentiments and security interests intersect. For ASEAN nations, there will be both welcome for it as a counterforce to China and concerns about Japan becoming a military power.

Essentially, defense spending exceeding 3% of GDP in 2026 signals the end of the "lightly armed, economy-focused" model that post-war Japan has built. This is not a temporary budgetary measure but a transformation of the very nature of the state, and its effects will continue to define Japan's politics, economy, diplomacy, and society for decades to come.

The delta: The jump in Japan's defense spending from the 1% of GDP ceiling to over 3% signifies not merely a quantitative expansion, but the structural end of the "lightly armed, economy-focused" national model maintained for 80 years since the end of the war. The speed at which the 2% of GDP target, set in the 2022 revision of the Three Security Documents, was deemed "insufficient" in just three years indicates that changes in the security environment are progressing faster than policy assumptions. This shift is driven less by the military threats from China and North Korea themselves, and more by the transformation of U.S. alliance strategy and the consequent urgent emergence of Japan's need for strategic autonomy.