Skip to main content

What Is the Capital Account and Why Does Money Move Between Countries?

Every day, billions of dollars move across borders. A Chinese investor buys an office building in New York. A German pension fund purchases American corporate bonds. A Japanese automaker builds a factory in Tennessee. A Brazilian entrepreneur borrows money from a German bank. These flows of money—investments, loans, and asset purchases—make up the capital account, the second major component of the balance of payments. The capital account reveals where the world's money is going, which economies are attracting investment, and which are becoming net borrowers. Understanding capital flows is crucial because they determine exchange rates, interest rates, and whether an economy can sustain growth through investment or whether it's relying on borrowing.

The capital account is less visible than the current account. A trade deficit shows up in news headlines. Capital flows happen in boardrooms and trading floors. But capital flows are equally important. In fact, for modern economies, capital flows are more important than trade flows. A country might run a large trade deficit, but if capital is flowing in to finance productive investment, growth can accelerate. Conversely, a country might have trade balance, but if capital is flowing out (investors losing confidence), the economy can slow. Capital accounts are where the rubber meets the road for economic policy and currency values.

Quick definition: The capital account (sometimes called the financial account) measures flows of investment, loans, and changes in foreign exchange reserves across international borders. It includes foreign direct investment, portfolio investment, and other financial flows.

Key takeaways​

  • The capital account must match the current account: a current account deficit requires a capital account surplus, and vice versa
  • Foreign direct investment (FDI) is long-term commitment: when companies build factories or acquire businesses, they're making bets on long-term growth
  • Portfolio investment is more volatile: stocks and bonds are easier to sell quickly, making flows more changeable
  • Capital flows determine exchange rates: demand for a currency depends partly on investment inflows
  • Developing countries often depend on capital inflows: they borrow and attract investment to finance growth beyond what domestic savings allow
  • Capital controls exist to manage flows: countries that don't want capital to leave use restrictions, creating the possibility of persistent current account surpluses

The Structure of the Capital Account​

The capital account has three main components: foreign direct investment, portfolio investment, and other investment (including loans and changes in reserves).

Foreign Direct Investment (FDI)​

Foreign direct investment is when a company in one country invests in a business, builds a factory, or acquires a company in another country—with the intention of controlling it or having significant influence over it. The key distinction is control or substantial influence. An investor buying 5% of a company's stock isn't FDI. An investor buying 10% or more (the typical threshold) with intent to influence operations is FDI. A company building a factory is clearly FDI.

FDI can take several forms:

Greenfield Investment. A company builds a new facility from scratch. When Toyota builds a new factory in Kentucky, that's greenfield FDI into the United States. When Tesla builds a factory in Germany, that's greenfield FDI into Germany.

Acquisitions and Mergers. When one company buys another. When Pepsi acquired the Indian beverage company Tropicana, that was American FDI into India. When Nestlé (Swiss) acquired the American coffee company Starbucks, that was FDI.

Joint Ventures. When two companies from different countries create a shared business. This is also recorded as FDI.

Reinvested Earnings. When a multinational company's foreign subsidiary earns profits and reinvests them (rather than sending them home as dividends), those reinvested profits count as FDI.

FDI is considered the most stable form of capital inflow because it represents a long-term commitment. A company building a factory intends to operate it for decades. It's not easy to quickly exit a factory investment. By contrast, stock investors can sell shares in seconds.

Forms of Capital Inflow by Stability​

The stability of capital inflows varies. FDI is longer-term, while portfolio investment can flee quickly during crises.

In 2023, the United States received approximately $285 billion in FDI inflows. Major sources included investment from Canada, the UK, France, and Japan. The Bureau of Economic Analysis publishes detailed FDI data by source country and sector. The U.S. attracts FDI because:

  • Large, stable market
  • Rule of law and property rights protection
  • Skilled workforce
  • Advanced infrastructure
  • Access to technology and innovation

Developing countries often attract FDI for different reasons:

  • Low labor costs
  • Access to natural resources
  • Growing markets and rising incomes
  • Government incentives

China, for instance, has been the world's largest FDI recipient (competing with the U.S. for the top spot in some years) because of low labor costs, manufacturing scale, and government policies that welcome foreign investment.

FDI flows reveal something important: which countries are seen as good places to invest. Countries with stable institutions, strong rule of law, and good growth prospects attract FDI. Countries with weak institutions, corruption, or poor growth prospects receive little. An economy that suddenly stops attracting FDI is experiencing a crisis of confidence.

Portfolio Investment​

Portfolio investment is when investors buy stocks, bonds, or other securities across borders without seeking control. An American mutual fund buying Japanese stocks is portfolio investment. A British investor buying U.S. Treasury bonds is portfolio investment. A German insurance company buying Indian corporate bonds is portfolio investment.

Portfolio investment is more volatile than FDI because it's easier to exit. An investor can sell stocks or bonds in seconds. A company cannot sell a factory in seconds. This difference in liquidity makes portfolio investment flows more changeable.

Portfolio investment breaks down into two types:

Equity Investment. Buying stocks in foreign companies. This is volatile because stock prices fluctuate and investors can sell anytime.

Debt Investment. Buying bonds issued by foreign governments or companies. This is somewhat more stable than equity because bondholders receive fixed returns (interest payments). But during crises, even bond investors flee.

In 2023, the United States received approximately $200 billion in portfolio investment inflows. European investors bought American stocks and bonds, and American investors bought foreign stocks and bonds. This mutual investment is typical of integrated financial markets.

Portfolio flows are highly sensitive to:

  • Interest rate differentials: if the U.S. raises interest rates above other countries, foreign investors buy U.S. bonds for higher returns
  • Growth differentials: if the U.S. is growing faster than Europe, investors prefer American stocks
  • Risk sentiment: in times of crisis, investors flee risky assets and buy safe government bonds (typically U.S. Treasuries)
  • Currency expectations: if investors expect a currency to appreciate, they buy assets in that currency

During the 2008 financial crisis, portfolio flows reversed sharply. Investors fled risky assets worldwide and bought U.S. Treasuries for safety. During the pandemic recovery, flows into developing countries surged as investors sought higher returns. These flows are far more volatile than FDI.

Countries that depend heavily on portfolio investment are vulnerable to sudden reversals. When capital flees (as happened to many emerging markets in the 1990s), interest rates spike, currencies collapse, and crises follow. This is why many economists worry about countries with large portfolio investment inflows that could leave suddenly.

Other Investment and Reserve Flows​

This category includes loans, trade credit, and changes in foreign exchange reserves held by central banks.

Bank Loans. When a German bank makes a loan to a Brazilian company, that's a capital flow from Germany to Brazil. The loan must be recorded as it's extended and again as it's repaid.

Trade Credit. When a supplier extends 90-day payment terms to a customer, that's implicitly a loan and counts as a capital flow.

Currency Reserves. Central banks hold foreign exchange reserves—dollars, euros, yen, gold. When the Chinese central bank buys dollars to increase its reserves, that's a capital inflow to the U.S. When the Federal Reserve sells euros to support currency markets, that's a capital outflow.

These flows are large but less visible than FDI and portfolio investment. Changes in central bank reserve accumulation have huge implications for currency values. China and other countries have historically accumulated dollars as reserves, which supported the dollar's value. If they stopped (or reversed), the dollar would weaken.

The Capital Account Must Balance the Current Account​

Here's the crucial insight: the capital account is mechanically determined by the current account. If a country runs a large current account deficit, it must run a large capital account surplus. If it runs a current account surplus, it must run a capital account deficit.

This isn't policy—it's accounting.

When Americans import more goods than they export, foreign companies receive dollars. They either:

  1. Spend those dollars on American goods or services (reducing the current account deficit)
  2. Invest them in American assets (creating a capital account inflow)
  3. Hold them (which banks then lend out, creating capital flows)

All paths lead to capital inflows. The dollars must go somewhere. They become the capital account surplus that balances the current account deficit.

Here's a real example. In 2023:

  • U.S. current account deficit: −$467 billion
  • U.S. capital account surplus: +$467 billion

The match is almost perfect (real data has measurement errors creating "statistical discrepancies," but the principle holds).

This means that if the U.S. wanted to reduce its current account deficit without repelling capital inflows, it would be mathematically impossible. The current account deficit exists because capital is flowing in. Reducing the deficit would require either (a) reducing capital inflows (which would slow investment and growth), or (b) raising domestic savings to match consumption (which would require either higher taxes or lower spending).

This is why economists say current account deficits aren't "fixable" with trade policy alone. Trade policy changes what gets imported and exported. Capital flows change based on investment incentives, growth expectations, and interest rates. You can't solve a capital-driven current account deficit with tariffs.

Why Capital Flows Internationally​

Capital flows internationally for several fundamental reasons:

Return Seeking. Investors want returns. If expected returns are higher in the U.S. than in Europe, capital flows to the U.S. This is true for all investors: individuals, pension funds, insurance companies, and governments. If a Swedish pension fund expects higher returns from U.S. stocks than Swedish stocks, it buys U.S. stocks.

Risk Diversification. Investors want to diversify risk. A portfolio of only Japanese stocks is risky (concentrated in one economy). A portfolio with Japanese stocks, U.S. stocks, and European bonds is diversified across geographies and currencies. To diversify, investors buy assets globally.

Specialization of Finance. Some countries have specialized financial sectors. London dominates banking. New York dominates securities trading. Singapore dominates Asian finance. Companies and investors go where the best financial services exist. This creates concentrated capital flows.

Growth Opportunities. Investors seek growth. A fast-growing economy offers more return opportunities. Developing economies with young populations and rising incomes attract capital because investors expect high returns. As a developing economy matures and growth slows, capital flows weaken.

Risk Avoidance. During crises, investors flee risk. Capital flows to safe havens (typically U.S. Treasuries, Swiss francs, gold). This flight to safety is a major driver of capital flows during volatile periods.

Exchange Rate Expectations. If investors expect a currency to appreciate, they buy assets in that currency (or the currency itself). If they expect depreciation, they sell. These expectations drive significant flows.

Regulatory Arbitrage. Some investors move capital to jurisdictions with favorable tax or regulatory treatment. Capital flows to low-tax jurisdictions or places with light regulation (though this is harder now with increased tax coordination).

Capital Flows and Development​

Capital flows are crucial to developing countries. A developing economy cannot grow past what its domestic savings allow unless it attracts foreign capital. This is why FDI and portfolio investment are so important to countries like India, Vietnam, and Brazil.

Here's the logic: Economic growth requires investment. Investment requires savings. If a country's population is poor and can only save a small percentage of income, growth is limited. But if foreign investors believe in the country's future and invest capital, growth can be much faster.

India's growth from 2000-2010 was fueled partly by FDI inflows and portfolio investment. Foreign companies saw opportunity and built factories and offices. This investment funded growth beyond what Indian domestic savings alone could support.

However, capital flows to developing countries are also volatile. A crisis in one country (like Russia in 1998 or Brazil in 2001) can trigger capital flight from all emerging markets. Investors suddenly become risk-averse and pull money out. This creates currency crises, interest rate spikes, and economic contractions.

This volatility is why many developing countries worry about excessive reliance on portfolio investment (which can flee quickly) versus FDI (which is longer-term). The IMF's capital flow statistics track patterns of investment flows globally and provide analysis of financial stability risks.

Capital Controls: When Countries Limit Flows​

Some countries impose capital controls—restrictions on money moving in or out of the country. These controls allow a country to run a persistent current account surplus without having capital flow out.

China, for example, historically restricted capital flows. This allowed China to run a large trade surplus (exporting much more than importing) without having that surplus's matching capital account deficit occur. Normally, if you have a large trade surplus, capital must flow out (because sellers of your exports need somewhere to deploy the foreign currency they receive). But with capital controls, China could accumulate foreign reserves instead.

Capital controls have both benefits and costs:

Benefits:

  • Prevent sudden capital flight during crises
  • Allow countries to run persistent surpluses
  • Reduce financial volatility

Costs:

  • Prevent efficient capital allocation (money can't flow to its highest-return uses)
  • Create corruption (officials control access to foreign currency)
  • Reduce competition and innovation in finance
  • Can be circumvented, creating black markets

Modern trend: countries are liberalizing capital flows because the costs of control outweigh benefits. Even China has gradually opened its capital account, though restrictions remain.

Capital Account Imbalances Over Time​

A key fact: capital account positions accumulate over time. If a country runs a capital account surplus (capital inflows exceed outflows) for 20 years, it accumulates a large net debtor position. If it runs a capital account deficit (capital outflows exceed inflows) for 20 years, it accumulates net creditor position.

The U.S. has run capital account surpluses for decades (matching current account deficits). This means the U.S. has a large net debtor position—foreigners own more U.S. assets than Americans own foreign assets. This is sustainable only as long as:

  1. Capital continues to flow in (investors remain confident)
  2. Returns on American assets remain attractive
  3. The dollar remains valued globally

If any of these change, the position becomes unsustainable. This is why some economists worry about long-term U.S. sustainability.

By contrast, Japan has run capital account deficits for decades (capital outflows exceed inflows). Japanese investors have invested globally, accumulating a large net creditor position. Japan owns many more foreign assets than foreigners own Japanese assets. This gives Japan more stable external finances.

Germany similarly runs capital account deficits because it's saving more than it invests domestically, so capital flows out.

United States. Receives large capital inflows (FDI, portfolio investment, bank deposits). Story: Safe haven, strong growth, attractive returns. Foreigners want to invest there.

China. Historically received large FDI (factories), but with capital controls preventing equivalent outflows. Story: Manufacturing hub attracting factory investment. Recently liberalizing and experiencing increasing outflows as Chinese investors deploy capital globally.

Brazil. Receives FDI in commodities and manufacturing, but experiences portfolio volatility. Capital flows in when commodity prices are high and growth looks good; flows out during downturns. Story: Developing economy with volatile growth and risk-dependent capital.

United Kingdom. Large portfolio investment flows (financial services). Capital flows out for investment (banks and investors deploying capital globally). Story: Financial center with global reach.

Germany. Capital outflows exceed inflows because Germans are savers investing globally. Story: High-saving, mature economy deploying capital internationally.

India. Receives significant FDI and portfolio investment, also has remittances from diaspora. Story: Fast-growing emerging economy attracting investment seeking growth.

Common Mistakes in Interpreting Capital Accounts​

Mistake 1: Confusing Capital Inflows with Strength. Large capital inflows can indicate strength (attractive investment opportunities) or weakness (desperate need for financing). You must look at why capital is flowing in.

Mistake 2: Treating Capital Flows as Permanent. Flows change based on growth expectations, interest rates, and risk sentiment. A country with strong inflows one year can face outflows the next if circumstances change.

Mistake 3: Ignoring Capital Controls. Countries with restrictions on capital flows don't fully integrate with global markets. The capital account may appear balanced when in reality controls are preventing natural flows.

Mistake 4: Assuming Portfolio Investment is Stable. Unlike FDI, portfolio investment can reverse quickly. A country with a large portfolio investment inflow is vulnerable to sudden reversal.

Mistake 5: Forgetting That Flows Are Annual, Stocks Accumulate. The capital account measures yearly flows. But year after year of flows create accumulated positions (net debtor or creditor status). Understanding long-term sustainability requires looking at accumulated stocks, not just current flows.

FAQ​

Why do developed countries typically have capital account surpluses while developing countries have deficits?​

Developed countries attract more capital inflows (FDI from developed countries investing in other developed countries; portfolio investment from globally diversified investors). Developing countries need capital inflows to grow beyond domestic savings, so they naturally have capital account deficits. As countries develop, this pattern gradually reverses—they transition from needing imported capital to exporting it.

Can a country sustain a capital account deficit indefinitely?​

No. A capital account deficit means capital is flowing out faster than it's coming in. This happens when a country's savings exceed investment, meaning it's accumulating foreign assets. Japan and Germany do this. But eventually, accumulated assets generate investment income that changes the dynamics. There's a natural limit: you can't run deficits forever because eventually you'd own all assets globally, which is impossible.

How does the Federal Reserve influence capital flows?​

When the Fed raises interest rates, U.S. assets become more attractive (higher returns), attracting capital inflows. When it cuts rates, capital flows out seeking higher returns elsewhere. This is why Fed policy affects exchange rates and international capital flows.

What happens during a "capital flight"?​

Capital flight is when investors suddenly lose confidence and pull money out of a country. This happens during crises or when growth prospects dim. The sudden outflow forces the currency down (less demand), interest rates up (fewer buyers of bonds), and often triggers recession. Capital flight is devastating for developing countries.

Why do some countries try to prevent capital outflows?​

Capital outflows can be destabilizing (especially from developing countries with limited reserves). If capital floods out, the currency collapses. Also, wealthy individuals and companies might try to move assets to avoid taxes. Governments restrict outflows to prevent these problems. But controls have costs: they reduce efficiency and create corruption opportunities.

Is the U.S. current account deficit sustainable given the capital account surplus?​

This is debated. The U.S. can sustain deficits as long as foreign investors believe in American growth and returns. But if confidence deteriorates, capital inflows would stop, the dollar would weaken, and the deficit would shrink. Whether that happens depends on future U.S. economic performance and global investor sentiment.

Summary​

The capital account measures flows of investment, loans, and asset purchases across international borders. It has three main components: foreign direct investment (long-term business investments), portfolio investment (stocks and bonds), and other investment (loans and reserve flows). The capital account is mechanically determined by the current account—a current account deficit must be matched by a capital account surplus. Capital flows internationally seeking returns, diversification, and growth opportunities. Developing countries depend on capital inflows to grow beyond what domestic savings allow. Understanding capital accounts reveals where investment is flowing, which economies are attracting confidence, and whether current account imbalances are sustainable. Capital flows are more volatile than trade flows and are crucial determinants of exchange rates and economic stability.

Next​

→ What does the WTO do?