CFA Level I Exam · Capital Flows and the FX Market

Balance of Payments and Capital Flows for CFA Level 1

Updated 7 October 2026 · Fact-checked

The balance of payments (BOP) records all economic transactions between a country's residents 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 error: current account + capital account + financial account = 0. Solve questions by tracking the direction of each flow.

Understand Balance of Payments and Capital Flows

The balance of payments is a bookkeeping record of every transaction between residents of one country and the rest of the world over a period. It uses double-entry bookkeeping. Each transaction creates two entries, so the total must balance.

The current account records trade in goods and services, primary income (investment income such as interest, dividends and employee compensation) and secondary income (transfers such as remittances and foreign aid). A surplus means the country earns more from the world than it pays out. A deficit means the opposite.

The capital account is small. It covers capital transfers, such as debt forgiveness, and the purchase or sale of non-produced, non-financial assets, such as patents and land rights. The financial account records purchases and sales of financial assets: direct investment, portfolio investment (equities and debt securities), financial derivatives and other investment such as bank loans, plus changes in official reserve assets held by the central bank.

The key identity is: current account + capital account + financial account = 0 (ignoring statistical discrepancy). A current account deficit must be financed by a net inflow in the financial account. The country is selling assets or borrowing from abroad. A current account surplus is matched by net lending abroad, meaning financial account outflows.

Capital flows affect economies and exchange rates. Strong net inflows tend to push the domestic currency up, lower domestic interest rates and raise asset prices. They can also fuel credit booms and make the currency vulnerable if flows suddenly reverse. A current account deficit is not bad in itself. It is a problem when it is large, persistent and financed by volatile short-term flows. Another useful link: the current account balance equals national saving minus domestic investment. A country that invests more than it saves must borrow from abroad.

Key formulas to remember

BOP identity: Current account + Capital account + Financial account = 0; Holds apart from a statistical discrepancy. Reserve changes sit inside the financial account in the current IMF presentation.
Current account composition: CA = Net trade in goods and services + Net primary income + Net secondary income; Net means receipts minus payments.
Trade balance: Trade balance = Exports − Imports; A deficit is a negative value. It is only part of the current account.
Saving-investment identity: CA = S − I (S = total national saving, private + government; I = domestic investment); Equivalent form: CA = (S_private − I) + (T − G), where S_private is private saving, T is government tax revenue and G is government spending. Government saving is T − G.
Financing link: CA deficit ⇒ net financial account inflow (a surplus in the financial account); Direction matters: inflows from foreign purchases of domestic assets finance the deficit.

How to solve Balance of Payments and Capital Flows questions

Use this method for classification, identity and capital flow questions.

1Read the question and decide what is asked: classify a transaction, find a missing balance, or judge an effect.
2Classify each item: goods, services, income or transfers go to the current account; capital transfers and non-produced assets to the capital account; purchases or sales of financial assets to the financial account.
3Set the sign by direction of money for the country: receipts from abroad are positive, payments abroad are negative. For financial assets, a foreign purchase of domestic assets is an inflow.
4Add the balances using CA + KA + FA = 0. Solve for the unknown, and keep signs consistent.
5For a deficit or surplus question, link it to financing: a deficit needs a financial account inflow, a surplus means outflows.
6For effect questions, think flows first: net inflow raises demand for the domestic currency, putting upward pressure on it and downward pressure on rates.
7Check that your answer has the right sign and is among the three options. Eliminate options that break the identity.

Quickest way: Sign-and-sum shortcut

When to use it: Use for any numeric BOP question with three accounts.

Write CA, KA and FA with their signs.
Remember they sum to zero, so the missing item equals minus the sum of the other two.
Use S − I for CA questions: a saving shortfall means a current account deficit.
If you are asked about a deficit, answer with financing: foreign capital inflows.
Eliminate options with the wrong sign first.

Common mistakes in Balance of Payments and Capital Flows

Treating the trade balance as the whole current account.
Trade in goods dominates news headlines.
Fix: Always add services, primary income and secondary income before judging the current account.
Confusing the capital account with capital flows in general.
The name suggests all capital movements.
Fix: Remember that the capital account is small (capital transfers and non-produced assets). Securities and loans are in the financial account.
Getting the sign wrong on the financial account.
Candidates mix up inflow and outflow of assets versus money.
Fix: A foreign investor buying domestic assets is a capital inflow and a positive financial account entry. A resident buying foreign assets is an outflow.
Assuming the three accounts do not need to sum to zero.
Candidates think a deficit is unbalanced.
Fix: Deficits in one account are offset by surpluses elsewhere. The identity holds except for statistical discrepancy.
Saying a current account deficit is always harmful.
Deficit sounds negative.
Fix: State the conditions: it is manageable when financed by stable long-term investment that funds productive domestic investment. Risk rises when it is large and financed by short-term flows.
Mixing up primary and secondary income.
Both are non-trade items.
Fix: Primary income is a return to factors (interest, dividends, wages). Secondary income is a transfer with nothing exchanged, such as remittances or aid.

Worked examples

Example 1

A country has a current account balance of −USD 80 billion and a capital account balance of +USD 2 billion. Ignoring any statistical discrepancy, what is its financial account balance? A) −USD 82 billion B) +USD 78 billion C) +USD 82 billion

Show the solution

Use CA + KA + FA = 0.
−80 + 2 + FA = 0.
FA = 80 − 2 = +78.
The financial account shows a net inflow of USD 78 billion, financing the deficit.

Answer: B) +USD 78 billion

Example 2

Which transaction is recorded in the financial account of Germany? A) A German firm receives dividends from a French subsidiary B) A Japanese pension fund buys German government bonds C) Germany forgives the debt of a developing country

Show the solution

A is investment income, so it is primary income in the current account.
C is debt forgiveness, a capital transfer, so it belongs to the capital account.
B is a foreign purchase of German debt securities, so it is portfolio investment in the financial account and a capital inflow.
Only B is a purchase of a financial asset.

Answer: B) A Japanese pension fund buys German government bonds

Exam tips

Practise classifying transactions into current, capital and financial accounts. This is the most common question type.
Check the sign convention before computing. Inflows of foreign capital are positive in the financial account.
When asked why a deficit is financed, answer with net capital inflows or reduced reserves, and use CA = S − I for reasoning questions.
Eliminate options that say the accounts need not balance, or that a deficit is always a problem.
With three options and no penalty for wrong answers, always answer. Remove the sign-inconsistent option first.

Practice questions from Capital Flows and the FX Market

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 capital account?

The current account records trade in goods and services, income and transfers. The capital account records capital transfers and non-produced, non-financial assets, and is usually small. Purchases and sales of financial assets go to the financial account.

Why must the balance of payments sum to zero?

It uses double-entry bookkeeping, so every transaction has an equal offsetting entry. A current account deficit is offset by a net inflow in the financial account. Measurement errors show up as a statistical discrepancy.

How do capital flows affect exchange rates?

Net capital inflows raise demand for the domestic currency and tend to push it up, while outflows tend to weaken it. Large inflows can also lower domestic rates and lift asset prices. Sudden reversals can cause sharp currency falls.

Is a current account deficit bad?

Not necessarily. If it funds productive investment and is financed by stable long-term flows, it can be sustainable. It becomes risky when it is large, persistent and financed by short-term, volatile capital.