Who's Actually Paying for Western Security?

The North Atlantic Treaty Organization is the most powerful military alliance in human history. Thirty-two nations, three nuclear powers, a combined GDP north of $40 trillion, and a mutual defense clause -- Article 5 -- that has been invoked exactly once, after September 11, 2001.

But behind the solidarity speeches and joint communiques is a simple, uncomfortable arithmetic: most NATO members do not pay their share. The alliance agreed in 2014 that each member should spend at least 2% of GDP on defense. A decade later, the majority still fall short. The United States spends 3.3%. Germany spent 1.5% for years before the Ukraine war forced a reckoning. Canada hovers at 1.3%. The result is a lopsided alliance where a handful of members -- led overwhelmingly by the United States -- subsidize the security of the rest.

We pulled military expenditure as a share of GDP and absolute military spending from the World Bank's World Development Indicators (originally sourced from the SIPRI Military Expenditure Database) for all 32 NATO members and the world's top 20 military spenders. The data covers 2000 to 2023. The picture is not ambiguous.

The 2% Target: Who Meets It, Who Doesn't

In 2014, at the Wales Summit, NATO leaders pledged to "aim to move towards" spending 2% of GDP on defense within a decade. The language was deliberately vague -- "aim to move towards" is not "will spend" -- and the results reflect that ambiguity.

Out of 31 NATO members with reported data (Iceland has no military), only nine meet the 2% threshold. The United States leads at 3.3%, followed by Poland at 3.27% and Estonia at 3.0%. Greece at 2.88% and Latvia at 2.97% round out the top five.

The pattern at the top is telling. The countries spending the most are either the United States (which has global military commitments far beyond NATO), or small countries on Russia's doorstep. Poland, Estonia, Latvia, Lithuania -- these are nations with living memory of Soviet occupation and an 800-mile border with a country that invaded its neighbor in 2022. They spend 2%+ because the alternative is not theoretical.

Now look at the bottom of the chart. Belgium spends 1.2% of GDP on defense. Luxembourg spends 0.72%. Spain at 1.26%, Canada at 1.29%, Italy at 1.46%. These are wealthy countries, members of the G7, with sophisticated economies that could easily afford 2%. They choose not to.

Germany deserves special attention. For decades, Germany was the poster child for NATO under-spending. Its military, the Bundeswehr, became a running joke -- soldiers training with broomsticks instead of rifles, helicopters grounded for lack of spare parts, a fleet of six submarines of which zero were operational. Germany spent 1.2-1.5% of GDP on defense while sheltering under the American nuclear umbrella and building a $4 trillion economy. Then Russia invaded Ukraine, and Chancellor Olaf Scholz announced a Zeitenwende -- a "turning point" -- with a EUR100 billion special fund for the Bundeswehr. By 2023, German military spending had risen to 1.5% of GDP. It is moving toward 2%, but the fact that it took a land war in Europe to get there says everything about the incentive structure.

The Dollar Gap

Percentages are abstract. Dollars are not.

If every NATO member that falls short of 2% were to close the gap, the total additional spending would be approximately $84 billion per year. That is not a rounding error. It is roughly equivalent to the entire military budget of Russia.

The largest single gaps come from the largest economies. Germany's shortfall in 2023 was roughly $22 billion. Italy's was about $11 billion. Canada's gap was $10 billion. Spain's was $9 billion. These are countries that routinely lecture the world about the importance of the rules-based international order while free-riding on American military power to maintain it.

The per-capita figures add another dimension. The United States spends $2,720 per person on defense. Norway spends $1,608. Estonia spends $902 per person -- a remarkable commitment for a country of 1.3 million people. Belgium? $435. Spain? $498. The willingness to pay, as economists would say, varies enormously.

The Global Picture

NATO burden-sharing is one lens. The global view is another. Here are the world's top 20 military spenders by absolute dollars:

The treemap makes one fact inescapable: the United States at $916 billion spends more on its military than the next nine countries combined. This is not a recent development. It has been true, in rough terms, since the end of the Cold War. American military hegemony is not just a matter of aircraft carriers and overseas bases -- it is a fiscal reality, built on a willingness to devote 3%+ of the world's largest economy to defense every single year.

China at $297 billion is a distant second, though the gap has been closing. Chinese military spending has grown at roughly 7% per year for two decades, tracking GDP growth. As a share of GDP, China spends only 1.7% -- modest by international standards. But when your GDP is $18 trillion, 1.7% buys a lot of military. China's approach has been to let economic growth do the work: no dramatic increase in the defense share, just relentless compounding.

Russia at $109 billion shows the cost of war. Russian military spending was around $65 billion in 2021. By 2023, it had nearly doubled, consuming 5.4% of GDP. The Ukraine war has forced Russia into a full wartime economy, with defense spending crowding out civilian investment. This is the guns-versus-butter tradeoff in real time.

India ($82 billion), Saudi Arabia ($78 billion), and the United Kingdom ($75 billion) complete the top six. India's spending is large in absolute terms but modest as a share of GDP (2.4%) -- a nuclear-armed country of 1.4 billion people with contested borders against both China and Pakistan. Saudi Arabia at 7.3% of GDP has one of the highest defense spending ratios on earth, driven by the Yemen war and strategic competition with Iran.

Historical Context: The Post-Cold War Collapse and Post-Ukraine Uptick

The chart below tracks military spending as a share of GDP for twelve key NATO members from 1990 to 2023. Two inflection points dominate: the post-Cold War decline and the post-2014 uptick.

Start with the United States. American military spending fell from 5.5% of GDP in 1990 to 3.0% by 2000 -- the "peace dividend" in action. Then came September 11. Spending climbed back to 4.5% during the Iraq and Afghanistan wars, peaking around 2010. Since then, it has gradually declined to 3.3%, though in absolute dollars it remains at record highs because GDP kept growing.

France and the United Kingdom show parallel trajectories: steep declines through the 1990s, stabilization around 2.0-2.5% in the 2000s. The UK has managed to stay near 2% throughout. France dipped below 2% for most of the 2010s.

Germany tells the starkest story. German military spending fell from 2.5% in 1990 to below 1.2% by 2014. For a quarter century, Germany systematically dismantled its military capacity, reaping the fiscal savings to fund social programs and infrastructure. It was rational -- why spend on defense when the Americans would do it for you? The rationality ended on February 24, 2022, when Russian tanks rolled into Ukraine.

Poland is the dramatic reversal story. Polish military spending was below 2% as recently as 2020. By 2023, it hit 3.27%, the second-highest in NATO after the US. Poland is buying American F-35s, Korean K2 tanks, and HIMARS rocket systems. It is building the largest land army in Europe. Poland remembers 1939 and 1945, and it has drawn the obvious conclusions from 2022.

Greece and Turkiye are the odd cases -- both have spent well above 2% for decades, but their spending is driven less by NATO solidarity than by their mutual rivalry. Greece consistently outspends most European allies, not out of commitment to the alliance, but because it faces a NATO ally as its primary strategic concern.

The Free-Rider Problem

The economics of alliance burden-sharing create a textbook public goods problem. Defense is non-excludable -- if the United States maintains a nuclear umbrella over Europe, every NATO member benefits whether they contribute or not. It is also non-rival -- Germany's security under the umbrella does not diminish France's.

This means every member has an incentive to underspend and let others pick up the tab. Economists call this free-riding. NATO calls it "burden-sharing challenges." The result is the same: the countries with the strongest commitment (or the most acute threat perception) overspend relative to their economic size, while the rest coast.

The United States has complained about this imbalance for decades. Every American president since Eisenhower has raised the issue. Trump was characteristically blunt -- threatening to withdraw from NATO if allies did not pay up -- but the factual substance of his complaint was identical to Obama's, Bush's, and Clinton's. The numbers are the numbers. When one country provides 70% of the alliance's military spending, the other 31 have a free-rider problem, regardless of how diplomatically the point is made.

The free-riders are not stupid. Belgium saves roughly $3 billion per year by spending 1.2% instead of 2%. That money goes to healthcare, pensions, infrastructure. For a small country with no external enemies and a powerful ally across the Atlantic, under-spending on defense is individually rational even if it is collectively corrosive.

Russia's Effect

The invasion of Ukraine in February 2022 was the most significant shock to European security since 1991. Its effects on NATO spending have been real but uneven.

Poland and the Baltic states accelerated spending that was already increasing. Germany announced its Zeitenwende special fund. Finland and Sweden, historically neutral, joined NATO -- bringing two capable militaries into the alliance.

But the aggregate numbers are more modest than the rhetoric suggests. NATO's European members spent an average of 1.75% of GDP on defense in 2023, up from about 1.5% in 2020. The increase is real. It is also far short of 2%. Three years after the largest land war in Europe since 1945, the majority of NATO members still do not meet the target they agreed to in 2014.

The explanation is structural. Defense spending is sticky. It takes years to build factories, train soldiers, procure weapons systems, and expand military infrastructure. A country cannot simply write a larger check and receive a functioning army next quarter. Germany's EUR100 billion special fund will take a decade to fully deploy. Poland's massive procurement program stretches to 2035. You can compare the full economic data for Germany and the United States to see the fiscal context behind their very different defense postures.

But the stickiness argument cuts both ways. It means that the countries that underinvested for decades -- the Germanys, the Belgiums, the Canadas -- face not just a funding gap but a capability gap. They cannot simply spend their way to 2% of GDP; they have to rebuild entire procurement pipelines, training establishments, and industrial bases that were allowed to atrophy for 30 years.

Japan and the 1% Ceiling

Outside NATO, the most consequential defense spending debate is in Japan. For decades, Japan maintained an informal 1% of GDP ceiling on military spending -- a self-imposed constraint rooted in the post-World War II constitution and the country's pacifist identity. Japan spent 0.9-1.1% of GDP on defense through the 2000s and 2010s.

In December 2022, Prime Minister Kishida announced Japan would double its defense budget to 2% of GDP by 2027. The driver was the same as in Europe: an increasingly assertive neighbor. China's military buildup, its claims over Taiwan, and its territorial disputes with Japan in the East China Sea changed the calculation. Japan is buying Tomahawk cruise missiles, investing in hypersonic weapons, and building cyber capabilities. The 1% ceiling is dead. The consequences for the Asia-Pacific military balance will take years to materialize, but the direction is unmistakable.

What the Numbers Say

Defense spending is ultimately about threat perception and political will. The countries that spend the most -- the United States, Poland, Estonia, Greece -- either face real threats or have made a strategic decision to project power globally. The countries that spend the least -- Belgium, Luxembourg, Spain, Canada -- have outsourced their security to others and redirected the savings to domestic priorities.

Neither approach is inherently wrong. A small country with no enemies and a powerful ally is being rational when it underspends. A large country with global interests is being rational when it overspends. The problem arises when the two coexist in the same alliance and pretend the arrangement is equitable.

The 2% target is arbitrary -- there is no economic law that says 2% is the right number. But it serves as a useful benchmark for measuring commitment. By that measure, the commitment is thin. Most NATO members have spent a decade "aiming to move towards" a target they have no intention of reaching until a crisis forces their hand.

Russia's war in Ukraine has forced some hands. Defense spending across NATO is rising. Poland is rearming at a pace not seen since the Cold War. Germany is stirring from its strategic slumber. Explore Poland's full economic profile to see how its rearmament fits within a broader fiscal picture. But the structural incentives for free-riding have not changed. As long as the United States provides the bulk of NATO's military power, the temptation to underspend will persist.

The data makes the imbalance visible. What to do about it is a political question. But the first step is seeing the numbers clearly, without the diplomatic euphemisms. The numbers are clear enough.

---

Methodology

Raw data inputs (all from World Bank WDI, originally sourced from the SIPRI Military Expenditure Database):

• Military expenditure (% of GDP) — WDI series MS.MIL.XPND.GD.ZS
• Military expenditure (current US$) — WDI series MS.MIL.XPND.CD
• GDP (current US$) — WDI series NY.GDP.MKTP.CD
• Population, total — WDI series SP.POP.TOTL

Derived metrics:

meets_target     = mil_pct >= 2.0
gap_pct          = max(0, 2.0 - mil_pct)                       // percentage points below target
gap_usd          = max(0, (2.0 - mil_pct) / 100) * gdp_current_usd
mil_per_capita   = mil_current_usd / population
total_nato_gap   = SUM(gap_usd) over all 31 reporting NATO members

For each country we take the most recent year with reported mil_pct in 2018-2023, then join GDP, population, and absolute military spending on the same (geo_id, year).

NATO membership: All 32 current NATO members as of 2024, including Finland (joined 2023) and Sweden (joined 2024). Iceland is excluded from spending comparisons as it has no standing military. Data availability varies: most members have data through 2023, some through 2022.

The 2% target: Adopted at the 2014 NATO Wales Summit. Members pledged to "aim to move towards the 2% guideline within a decade." The target refers to defense expenditure as a share of GDP, measured using NATO's standardized definition (which may differ from national reporting).

Dollar gap calculation: For each NATO member below 2%, the gap is computed as (2.0% - actual%) multiplied by nominal GDP. This represents the additional annual spending required to meet the target, assuming GDP remains constant. The total NATO gap of approximately $84 billion reflects 2023 data.

Limitations: Military spending figures from the World Bank may differ from NATO's own estimates due to different accounting methodologies. Chinese and Russian figures may understate actual spending due to off-budget items and purchasing-power differences. The 2% target measures inputs (spending), not outputs (military capability) -- a dollar spent on defense in Estonia does not buy the same thing as a dollar spent in the United States.