CFA Level I Exam · International Trade

Balance of Payments and Capital Flows for CFA Level I

Updated 7 October 2026 · Fact-checked

The balance of payments records all transactions between a country and the rest of the world. It has a current account, a capital account and a financial account. Together they sum to zero, apart from statistical discrepancy. The current account balance equals national saving minus domestic investment; a deficit means investment exceeds saving and is financed by capital inflows.

Understand Balance of Payments and Capital Flows

The balance of payments (BOP) is a bookkeeping record of all economic transactions between residents of one country and the rest of the world over a period. It uses double-entry bookkeeping. Every transaction has two sides, so the total must balance.

There are three main accounts. The current account records trade in goods and services, primary income (such as investment income and compensation of employees) and secondary income (current transfers, such as remittances and foreign aid). The capital account records small, mostly non-market items: capital transfers such as debt forgiveness, and purchases or sales of non-produced, non-financial assets such as patents or licences. The financial account records transactions in financial assets and liabilities: foreign direct investment, portfolio investment (equities and bonds), other investment (such as bank loans and deposits) and changes in official reserves.

The key rule: current account + capital account + financial account = 0. If you run a current account deficit, you are buying more from abroad than you sell, and you pay for it by selling assets or borrowing. That shows up as a net inflow in the financial account. Foreigners end up holding more claims on your country. A current account surplus works the other way: you lend to or buy assets from the rest of the world.

The same idea appears through national accounts. Output is used for consumption, investment, government spending and net exports. Rearranged, the current account balance equals national saving minus domestic investment. A country that invests more than it saves must borrow from abroad. A larger government deficit, with private saving unchanged, widens the current account deficit. This is the twin deficit idea.

International bodies help manage these flows. The IMF promotes global monetary cooperation and exchange rate stability, and lends to countries with balance of payments problems, usually with conditions. The World Bank focuses on long-term development and poverty reduction, financing projects and policy reform. The WTO deals with trade rules and disputes.

Key formulas to remember

Balance of payments identity: Current account + Capital account + Financial account = 0; Holds in theory; in practice a statistical discrepancy remains. The capital account is usually small, so the current account is roughly the mirror image of the financial account.
Current account components: CA = Net trade in goods and services + Net primary income + Net secondary income; Net exports are the largest part for most countries.
Savings-investment identity: CA = S − I, where S = Sp + Sg; Sp is private saving and Sg is government saving (T − G). A CA deficit means I > S.
Expenditure form of the identity: CA = S − I = (Sp − I) + (T − G); X − M equals CA only when net income and transfers are zero. Use this form to see how a fiscal deficit or an investment boom affects the current account.
Income and expenditure approach: GDP = C + I + G + (X − M); Subtract C and G from GDP, and adjust for net income and transfers, to get national saving; then S − I = CA.

How to solve Balance of Payments and Capital Flows questions

Most BOP questions ask you to classify an item, find the sign of a balance, or explain a current account change using saving and investment. Work through these steps.

1Identify what the question asks: classification, a balance to compute, or the cause of an imbalance.
2If classifying, decide whether the item is goods and services, income, or a transfer (current account), a non-produced asset or capital transfer (capital account), or a financial asset or liability (financial account).
3Decide the direction. Exports, income received and capital inflows are credits; imports, income paid and outflows are debits.
4For a balance, apply current + capital + financial = 0 and solve for the missing item, keeping signs consistent.
5For causes, switch to CA = S − I. Ask whether saving fell, investment rose, or the fiscal deficit widened.
6Check the conclusion. A CA deficit means net capital inflow and rising foreign claims on the economy.
7Eliminate options that reverse the sign or put an item in the wrong account.

Quickest way: Sign-and-account shortcut

When to use it: Use it for classification and sign questions when you have about 90 seconds.

Ask: is it a good, service, income or gift? If yes, it is current account.
Ask: is it a financial asset or liability, or reserves? If yes, it is financial account.
Anything rare, like debt forgiveness or a patent sale, is capital account.
For a balance, rearrange: Financial = −(Current + Capital).
For causes, use CA = S − I: higher investment or lower saving means a larger deficit.

Common mistakes in Balance of Payments and Capital Flows

Treating the capital account and financial account as the same thing.
Many countries and textbooks use the words loosely, and 'capital flows' sounds like both.
Fix: Capital account is small transfers and non-produced assets. Buying shares, bonds, loans and reserves is the financial account.
Thinking a current account deficit means the BOP does not balance.
Students look at one account in isolation.
Fix: The three accounts sum to zero. A current deficit is offset by a financial account surplus (net inflow).
Getting the sign wrong between CA and S − I.
Students memorise 'deficit is bad' without the identity.
Fix: CA = S − I. If I > S, CA is negative, a deficit. Write the identity first.
Assuming a trade deficit is always harmful or a surplus always good.
Media framing is one-sided.
Fix: A deficit can fund productive investment. It becomes a concern if financed by short-term flows or used for consumption, raising sustainability and currency risk.
Mixing up the roles of the IMF and World Bank.
Both are multilateral lenders.
Fix: IMF: monetary cooperation, exchange rate stability and BOP support. World Bank: long-term development financing.
Ignoring primary and secondary income in the current account.
Students focus only on goods trade.
Fix: Include investment income, wages and remittances when computing the current account.

Worked examples

Example 1

A country has a current account balance of −$42 billion and a capital account balance of +$3 billion. Ignoring statistical discrepancy, what is the financial account balance? Options: A) −$45 billion, B) +$39 billion, C) +$45 billion.

Show the solution

Use CA + capital + financial = 0.
−42 + 3 + financial = 0.
Financial = −(−42 + 3) = −(−39) = +39.
The financial account shows a net inflow of $39 billion, which finances the deficit.

Answer: B) +$39 billion

Example 2

An economy has private saving of 18% of GDP, government saving of −4% of GDP (a fiscal deficit) and domestic investment of 20% of GDP. What is the current account balance, and what does it imply for capital flows? Options: A) −6% of GDP with net capital inflows, B) −2% of GDP with net capital inflows, C) +2% of GDP with net capital outflows.

Show the solution

National saving S = 18% + (−4%) = 14% of GDP.
CA = S − I = 14% − 20% = −6% of GDP.
A deficit of 6% must be financed by net capital inflows into the financial account.
Option B has the wrong size; option C has the wrong sign.

Answer: A) −6% of GDP with net capital inflows

Exam tips

Memorise the identity CA = S − I and use it to reason about any cause-and-effect question. It resolves most conceptual items.
Classification questions are common. Link each item to one account by asking what is exchanged: goods or income, a financial claim, or a rare transfer.
With three options, eliminate any that reverse the sign of the financial account relative to the current account.
Know the IMF and World Bank roles in one sentence each; a wrong mix-up is an easy loss.
For calculations, write signs explicitly and check that the three accounts sum to zero.

Practice questions from International Trade

Balance of Payments and Capital Flows in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Balance of Payments and Capital Flows: frequently asked questions

What is the difference between the current account and the financial account?

The current account records trade in goods and services, income and transfers. The financial account records purchases and sales of financial assets and liabilities, such as FDI, securities, loans and reserves. They offset each other in the balance of payments.

Why must the balance of payments balance?

It is double-entry bookkeeping. Every purchase from abroad is paid for by giving up an asset or taking on a liability. So the current and financial accounts, with the small capital account, sum to zero apart from statistical discrepancy.

How do trade deficits relate to savings and investment?

The current account balance equals national saving minus domestic investment. If a country invests more than it saves, it has a current account deficit and borrows from abroad. Higher government deficits or lower private saving widen the deficit.

What is the role of the IMF and World Bank in the CFA curriculum?

The IMF promotes monetary cooperation and exchange rate stability, and lends to countries with balance of payments difficulties. The World Bank provides long-term financing for development and poverty reduction.