Australia's balance of payments explained: HSC Economics Topic 2
“Examine the structure of Australia's balance of payments including the current account and the capital and financial accounts, and analyse the links between them”
The BoP splits into the current account (BOGS, net primary and secondary income) and the capital and financial account; by the identity CA + KAFA = 0, so a CA deficit equals net capital inflow, and CA = S - I.
Think of Australia like a household with two bank statements. The current account is like your everyday spending statement: money coming in from your wages (exports) minus money going out on groceries and bills (imports), plus interest you pay on your mortgage (primary income) and any gifts you send overseas (secondary income). The capital and financial account is like your loans and savings statement: it shows how you covered any shortfall, by borrowing money or selling an asset. Here is the key trick: the two statements must always balance. If your everyday spending statement shows you spent more than you earned (a current account deficit), your loans statement must show you borrowed the difference from somewhere (a capital and financial account surplus) - you cannot spend money you did not somehow get from someone. For decades Australia was like a household that earned a good wage but always spent and invested a bit more than it earned (buying mining equipment, building houses), covering the gap with foreign "loans". Since 2019, high prices for what Australia sells overseas (iron ore, coal, gas) plus households saving more during COVID-19 have flipped this: Australia has been earning slightly more than it spends, for the first time in over 40 years.
What this dot point is asking
NESA wants you to explain the structure of the balance of payments (BoP), identify the components of the current and capital accounts, and analyse the link between them through the accounting identity. Expect a 4 to 6 mark short answer or a stimulus-based Section III question using ABS BoP data.
The answer
The balance of payments defined
The balance of payments is the statistical record of all economic transactions between Australian residents and the rest of the world over a given period, prepared by the Australian Bureau of Statistics (cat. no. 5302.0, quarterly). It has two main accounts:
- Current account (CA): flows of goods, services, primary income and secondary income.
- Capital and financial account (KAFA): changes in ownership of foreign assets and liabilities.
The two accounts must sum to zero (plus a statistical discrepancy item).
The current account
The current account has four sub-components:
- 1. Balance on goods and services (BOGS)
- Exports minus imports of goods (merchandise) and services. Australia's BOGS is heavily influenced by iron ore, coal and LNG prices.
- 2. Net primary income
- Income payments to and from non-residents: interest, dividends, profits and compensation of employees. Australia runs a persistent net primary income deficit (around 4 percent of GDP) because of its large stock of net foreign liabilities.
- 3. Net secondary income
- Transfers without a corresponding good or service: foreign aid, workers' remittances, pension transfers.
- 4. Capital account
- A small balancing item covering capital transfers and acquisition of non-produced, non-financial assets (patents, copyrights). Often included with the financial account.
The recent picture (ABS 2024 annual data, indicative figures):
| Component | AUD billion | Percent of GDP |
|---|---|---|
| Balance on goods and services | +100 | +3.8 |
| Net primary income | -90 | -3.4 |
| Net secondary income | -2 | -0.1 |
| Current account balance | +8 | +0.3 |
The capital and financial account
The capital and financial account records changes in ownership of assets and liabilities between Australian residents and non-residents.
Major components:
- Direct investment. Foreign investors taking stakes of 10 percent or more in Australian companies, and Australian firms doing the same overseas (BHP investments in Chile, Macquarie infrastructure investments in Europe).
- Portfolio investment. Foreign purchases of Australian shares and bonds, and vice versa. Australian government bonds are popular with foreign investors.
- Other investment. Bank loans, deposits and trade credit.
- Reserve assets. Foreign exchange and gold reserves held by the RBA.
A net capital inflow (KAFA surplus) finances a current account deficit. A net capital outflow (KAFA deficit) results from a current account surplus.
The accounting identity and economic interpretation
The balance of payments must balance:
This identity can be rewritten in terms of national accounts:
where S is national savings (household, business and government combined) and I is national investment. A current account deficit (CA < 0) means investment exceeds national savings; foreign capital makes up the difference.
Two equivalent interpretations:
- Expenditure interpretation. A CA deficit means the economy is spending more on goods and services (consumption + investment + government) than it is producing.
- Savings interpretation. A CA deficit means national savings are insufficient to fund national investment; the shortfall comes from abroad.
Australia's experience
For most of the post-1980 period, Australia ran current account deficits of 3 to 6 percent of GDP, financed by net capital inflow. The deficits reflected:
- High investment, particularly mining capex during the 2003 to 2014 boom.
- Relatively low household savings during the 1990s and 2000s.
- A persistent net primary income deficit on a growing stock of net foreign liabilities.
Since 2019, Australia has run small current account surpluses for the first time in over four decades. Drivers:
- Record terms of trade. Iron ore, coal and LNG prices spiked in 2021-22.
- Higher household savings. COVID-19 lockdown savings, then continued caution.
- Lower mining capex. Investment phase of the resources boom has ended; production exports dominate.
The current account surplus may not persist if commodity prices fall.
The identity, cold. Memorise: CA + KAFA = 0 (plus a small statistical discrepancy) - a current account deficit is always exactly matched by a capital and financial account surplus, because any spending shortfall must be funded by foreign capital inflow. Equivalently, CA = S - I (savings minus investment): a CA deficit means investment exceeds national savings. The current account has four parts - BOGS, net primary income, net secondary income, and the small capital account item - while the capital and financial account covers direct investment, portfolio investment, other investment and reserve assets. Australia ran deficits of around 3 to 6% of GDP for most of 1980 to 2019, then small surpluses from 2019, peaking around plus 2.5% of GDP in 2021 (RBA/ABS) on record terms of trade and higher household savings.
Causes of current account deficits
Long-run drivers of Australia's CA deficit:
- Savings-investment gap. Australia has historically invested more than it saved, especially during the mining boom.
- Demographics. A growing population requires growing capital stock (housing, infrastructure, business capital).
- Stock-flow dynamics. Net foreign liabilities generate ongoing servicing costs (interest, dividends), which feed back into the net primary income deficit.
- Terms of trade volatility. When commodity prices fall, BOGS deteriorates rapidly.
Causes of current account surpluses (recent)
- Commodity price boom. Iron ore averaged USD 115/tonne in 2021-22, more than double the long-run average.
- Mining investment phase complete. Less import-heavy capex needed; mature export production.
- Strong household savings. Household savings ratio jumped from 5 percent pre-COVID to over 20 percent in 2020-21.
Worked example 1 - structure and identity (5 marks)
Question. Explain the structure of Australia's balance of payments and identify the major components of Australia's current account in the most recent period.
Model answer. The balance of payments records all transactions between Australian residents and the rest of the world, split into the current account (CA) and the capital and financial account (KAFA), which sum to zero by the identity CA + KAFA = 0. The current account has four components: the balance on goods and services (BOGS), net primary income, net secondary income and a small capital account item. In the most recent period, Australia recorded a current account surplus of around plus 1.0% of GDP (2023, ABS Balance of Payments data), driven by a strong BOGS surplus from iron ore, coal and LNG exports, partly offset by a persistent net primary income deficit from servicing net foreign liabilities.
Marker's note: markers reward the structure (two accounts named), the identity, and at least three current-account components with a recent, dated figure. A response that lists components with no data, or omits the identity, stays mid-band.
Worked example 2 - data/stimulus response (5 marks)
Question. A described dataset shows Australia's current account balance narrowing from about minus 4.0% of GDP in 2000 to about plus 2.5% of GDP in 2021. Describe the trend and explain the causes.
Model answer. The current account moved from a substantial and persistent deficit of about minus 4.0% of GDP in 2000 to a surplus of about plus 2.5% of GDP by 2021, a swing of roughly 6.5 percentage points, crossing from deficit to surplus around 2019 to 2020. The shift is explained by a record terms of trade (iron ore, coal and LNG prices spiking through 2021 to 2022), a jump in the household savings ratio during COVID-19 lockdowns which closed the savings-investment gap (CA = S - I), and the completion of the import-heavy mining investment phase.
Marker's note: about 2 marks for an accurate trend with the endpoint figures and direction, about 3 marks for at least two dated causes correctly linked via the terms-of-trade or S-I mechanism. A description with no mechanism caps at 2 to 3.
Worked example 3 - extended-response paragraph (analyse, 8 marks)
Question (paragraph only). Analyse the causes of Australia's shift from current account deficit to surplus since 2019. Write one body paragraph on the terms-of-trade channel.
Model paragraph. The clearest driver of Australia's shift to current account surplus is the record terms of trade of the early 2020s. Iron ore, Australia's largest export earner, averaged more than USD 110 per tonne in 2021 as global steel-making demand surged, while coal and LNG prices also rose sharply on post-pandemic energy demand. Because export prices rose far faster than import prices, the balance on goods and services swung strongly into surplus, lifting the current account to around plus 3% of GDP by 2021 (RBA/ABS). This is the terms-of-trade mechanism at work: a favourable shift in the ratio of export to import prices raises national income directly, and via CA = S - I, higher export income lifts national savings relative to investment, pushing the current account into surplus.
Marker's note: markers reward the named mechanism (terms of trade raising export income relative to import costs), the S-I or CA identity used explicitly, and dated Australian data (iron ore price 2021; CA balance 2021). A paragraph asserting "exports went up" with no mechanism or year stays mid-band.
- Confusing the current account and the financial account
- The CA records goods, services and income flows. The financial account records ownership changes of assets.
- Forgetting the savings-investment identity
- Markers reward responses that link the CA to the S-I gap (CA = S - I), not just the CA + KAFA = 0 identity alone.
- Treating the CA surplus as permanent
- Make clear it depends on continued high commodity prices and household savings; a terms-of-trade reversal could push Australia back into deficit.
- Listing current-account components with no recent, dated figure
- "BOGS, primary income, secondary income" with no year or magnitude loses the data-application marks that stimulus questions specifically reward.
- Always state the identity, then apply it
- Writing "CA + KAFA = 0" alone earns little; pair it with "so a current account deficit is financed by a capital and financial account surplus" and, where relevant, the S-I version "CA = S - I, so a deficit means investment exceeds national savings".
- For a data/stimulus item, describe THEN explain
- First quote at least two data points with direction (e.g. "narrowed from about minus 4.0% of GDP in 2000 to about plus 2.5% in 2021"), then explain the cause using a named mechanism (terms of trade, savings-investment gap), not just a repeat of the numbers.
- Anchor every claim with a year
- "Australia has a CAD" is weak; "Australia recorded a current account surplus of around plus 1.0% of GDP in 2023 (ABS)" earns the application mark. Use RBA/ABS as your source tag when citing balance-of-payments figures.
Exam-style questions
Questions in the style of NESA exam questions on this dot point, each with a worked answer. They are written by ExamExplained unless tagged "Past paper"; the year shows the paper a question is modelled on.
2024 HSC-style5 marksExplain the structure of Australia's balance of payments and identify the major components of Australia's current account in the most recent period.Show worked answer →
A 5 mark response needs the BoP structure, the accounting identity, and recent data.
Structure. The balance of payments records all transactions between Australian residents and the rest of the world. It has two accounts:
- Current account (CA): records flows of goods, services, primary income (interest, dividends, wages) and secondary income (transfers).
- Capital and financial account (KAFA): records changes in ownership of assets (FDI, portfolio investment, reserve assets, other investment).
Identity. CA + KAFA = 0 (plus a statistical discrepancy). A current account deficit must be financed by a capital and financial account surplus, and vice versa.
Current account components (2024 data, ABS Balance of Payments cat. no. 5302.0). Australia recorded a small current account surplus in 2024 of around 1.0 percent of GDP, driven by:
- Balance on goods and services (BOGS): surplus of around AUD 100 billion, driven by iron ore (AUD 130 billion), LNG (AUD 70 billion), coal (AUD 60 billion) and education services (AUD 50 billion).
- Net primary income: deficit of around AUD 90 billion (interest and dividend payments to foreigners on Australia's net foreign liabilities).
- Net services: roughly balanced (tourism inflows, education exports).
Markers reward (1) accurate structure, (2) the identity, (3) at least three components with recent figures.
2021 HSC-style4 marksOutline the relationship between the current account and the capital and financial account in Australia's balance of payments.Show worked answer →
A 4 mark response needs the identity, the savings-investment gap interpretation, and a brief application to Australia.
- The accounting identity
- The balance of payments must balance: CA + KAFA = 0 (plus statistical discrepancy). A current account deficit is mirrored by a capital and financial account surplus.
- Economic interpretation
- A current account deficit means national absorption (consumption plus investment plus government spending) exceeds national production. The shortfall must be financed by foreign capital inflow, which is recorded as a capital and financial account surplus.
- Savings-investment gap
- Equivalently, CA = S - I (savings minus investment). A CA deficit means investment exceeds savings; foreign capital makes up the difference.
- Application
- Australia has historically run a current account deficit (around 4 percent of GDP for most of the 1990s and 2000s), financed by net capital inflow. The deficit reflected an investment-driven economy with relatively low household savings. Since 2019 Australia has run small current account surpluses, driven by record terms of trade and rising household savings.
Markers reward (1) the identity, (2) the S-I interpretation, (3) at least one Australian example.
Practice questions
Original practice questions graded from foundation to exam level, each with a full worked solution. Try them before revealing the solution.
foundation3 marksDefine the balance of payments and name its two main accounts.Show worked solution →
Definition (1 mark). The balance of payments is the ABS record of all economic transactions between Australian residents and the rest of the world over a period (cat. no. 5302.0, quarterly).
Two accounts (2 marks, 1 each). The current account (goods, services, primary income, secondary income) and the capital and financial account (changes in ownership of assets and liabilities: direct investment, portfolio investment, other investment, reserve assets).
Markers reward a clear definition plus both accounts correctly named; naming only one account caps the response at 2 marks.
foundation4 marksOutline the four components of Australia's current account, giving one Australian example of each.Show worked solution →
- BOGS - 1 mark
- Exports minus imports of goods and services. Example: iron ore, coal and LNG exports drive Australia's goods surplus.
- Net primary income - 1 mark
- Interest, dividends and profits paid to and received from non-residents. Example: Australia runs a persistent net primary income deficit from servicing its net foreign liabilities.
- Net secondary income - 1 mark
- Transfers with no corresponding good or service. Example: foreign aid payments, workers' remittances.
- Capital account - 1 mark
- A small item for capital transfers and non-produced, non-financial assets. Example: transfer of patents or copyrights.
Full marks need all four named with a fitting Australian example each, not a generic definition repeated four times.
core5 marksA described dataset (ExamExplained, illustrative of ABS Balance of Payments data) shows Australia's current account balance as a percentage of GDP for selected years: 2000 about minus 4.0%, 2008 about minus 4.5%, 2016 about minus 3.0%, 2020 about minus 2.0%, 2021 about plus 2.5%, 2023 about plus 1.0%. Describe the trend shown, and explain the causes of the shift from deficit to surplus.Show worked solution →
A 5-mark "describe and explain" needs an accurate reading of the trend WITH figures, then a causal explanation, not a repeat of the numbers.
Describe the trend (about 2 marks). Australia ran a sizeable current account deficit for most of the period shown, deepening slightly from about minus 4.0% of GDP in 2000 to about minus 4.5% in 2008, before narrowing steadily through the 2010s to about minus 3.0% in 2016 and minus 2.0% in 2020. The account then swings into surplus, peaking at about plus 2.5% in 2021, before easing back to about plus 1.0% by 2023 - the first sustained surpluses in over four decades.
Explain the shift (about 3 marks). The narrowing deficit reflects the tail end of the mining investment boom (falling import-heavy capex as projects moved from construction to production). The swing to surplus around 2020 to 2021 is driven by: (1) a record terms of trade as iron ore, coal and LNG prices spiked; (2) a jump in the household savings ratio during COVID-19 lockdowns, closing the savings-investment gap (CA = S - I); and (3) reduced primary income outflows as the stock of net foreign liabilities stabilised relative to GDP. The partial easing back toward surplus of about plus 1.0% by 2023 reflects commodity prices retreating from their peak.
Marking spine: accurate trend with at least three data points and direction (2), at least two distinct causes correctly linked to the CA (2), explicit note that the shift used the S-I or terms-of-trade mechanism (1). A description with no causes, or causes never tied to the data, caps at 3. (Figures are an ExamExplained dataset modelled on published ABS Balance of Payments trends; treat as illustrative.)
core6 marksExplain how a current account deficit is financed, using the accounting identity CA + KAFA = 0.Show worked solution →
A 6-mark "explain" needs the identity, the mechanism of financing, and an Australian illustration.
- State the identity (1 mark)
- CA + KAFA = 0 (plus a small statistical discrepancy), so a current account deficit is exactly offset by a capital and financial account surplus.
- Explain the mechanism (about 3 marks)
- A CA deficit means Australia is importing more goods, services and income payments than it exports; to pay for this, Australia must borrow from or sell assets to non-residents. This capital inflow is recorded as a KAFA surplus, made up of foreign direct investment (e.g. foreign takeovers of Australian firms), portfolio investment (foreign purchases of Australian government bonds and shares), and other investment (bank borrowing offshore).
- S-I interpretation (about 1 mark)
- Equivalently, CA = S - I: a CA deficit means domestic investment exceeds domestic savings, and the gap is filled by foreign capital.
- Australian illustration (about 1 mark)
- During the 2003 to 2014 mining boom, Australia ran CA deficits of around 4 to 6% of GDP, financed largely by foreign direct investment into mining projects and portfolio inflows into government bonds.
Marking spine: identity stated correctly (1), financing mechanism explained with at least two KAFA components (3), S-I link (1), Australian example (1).
exam8 marksAnalyse the causes of Australia's shift from a persistent current account deficit to current account surpluses since 2019.Show worked solution →
An 8-mark "analyse" needs multiple causes, the theoretical mechanism linking each to the CA, and dated Australian evidence, reaching a judgement on persistence.
Band 6 plan.
Thesis: Australia's shift from a multi-decade current account deficit (commonly 3 to 6% of GDP) to small surpluses from 2019 reflects a combination of a record terms of trade, a structural rise in household savings, and the completion of the mining investment phase, rather than a single cause - and the surplus is likely to prove partly cyclical.
Argument 1 - the terms-of-trade / BOGS channel. Mechanism: higher export prices relative to import prices lift export revenue without a matching rise in import volumes, directly improving BOGS and the current account (CA = S - I is the flip side: higher export income raises national income and savings). Evidence: iron ore prices averaged over USD 110 per tonne in 2021, more than double the pre-boom average, driving a BOGS surplus and lifting the current account to a surplus of around 3% of GDP in 2021 (RBA/ABS).
Argument 2 - the savings-investment gap closed. Mechanism: CA = S - I, so a current account surplus requires savings to exceed investment. Evidence: the household savings ratio rose from around 5% pre-COVID to over 20% in 2020, and mining investment fell as the sector moved from construction to production, so I fell while S rose.
Argument 3 - the maturing investment phase reduced import-heavy capex. Mechanism: mining capex (2003 to 2014) required importing machinery and capital equipment, worsening the current account; once mines moved to production, imports fell relative to export volumes.
Counter-weight / judgement: the surplus is vulnerable to a terms-of-trade reversal (iron ore prices have historically been volatile) and to household savings normalising as cost-of-living pressure persists; a sustained surplus requires the savings-investment gap to stay closed, not just a temporary price spike.
Model paragraph (Argument 1). The clearest driver of Australia's shift to current account surplus is the record terms of trade of the early 2020s. Iron ore, Australia's largest export earner, spiked to average more than USD 110 per tonne in 2021 as global demand for steel-making inputs surged, while coal and LNG prices also rose sharply on the back of post-pandemic energy demand. Because export prices rose far faster than import prices, the balance on goods and services swung strongly into surplus, lifting the current account to around plus 3% of GDP by 2021 (RBA/ABS data). This is the terms-of-trade mechanism at work: a favourable shift in the ratio of export to import prices raises national income directly, without any change in the physical volume of trade, and via CA = S - I, higher export income lifts national savings relative to investment.
Marker's note: markers reward at least two independent, correctly-mechanised causes (terms of trade, savings-investment gap, maturing investment phase), CURRENT Australian data carrying a year (iron ore prices 2021; savings ratio 2020; current account balance around plus 1 to 3% of GDP, 2021 to 2023), explicit use of the CA = S - I or terms-of-trade mechanism (not just description), and a calibrated judgement on whether the surplus will persist. A response that lists causes with no mechanism, or cites no dated data, cannot reach the top band.
core4 marksDistinguish between direct investment and portfolio investment in the capital and financial account, giving an Australian example of each.Show worked solution →
Direct investment (2 marks). Involves acquiring a stake of 10 percent or more in a foreign enterprise, giving a degree of management control. Example: BHP's mining investments in Chile, or foreign takeovers of Australian companies.
Portfolio investment (2 marks). Involves buying shares or bonds without acquiring control, typically a smaller and more liquid stake. Example: foreign investors purchasing Australian government bonds, or Australian superannuation funds buying US equities.
Full marks need both terms correctly distinguished by the control threshold AND a fitting Australian example each; an example with no distinguishing feature caps at 2.
exam7 marksEvaluate the extent to which Australia's current account surplus reflects a permanent structural shift rather than a temporary, cyclical outcome.Show worked solution →
A 7-mark "evaluate" needs a clear extent judgement, weighed evidence on both sides, and dated Australian data.
Band 6 plan.
Thesis: Australia's current account surplus since 2019 is only partly structural; the terms-of-trade component is largely cyclical and reversible, while the higher household savings ratio and completed mining investment phase are more durable, so the surplus is likely to narrow but not fully reverse to the historical 3 to 6% of GDP deficit.
Case for "structural". The mining investment phase has genuinely matured: capital-intensive construction has given way to production, permanently reducing the import intensity of the resources sector. Household savings behaviour may also have shifted durably following the COVID-19 shock (savings ratio rose from about 5% pre-COVID to over 20% in 2020, still elevated versus historical norms).
Case for "cyclical". Iron ore, coal and LNG prices are historically volatile; the terms-of-trade spike of 2021 to 2022 (iron ore over USD 110/tonne) has already partly unwound, and the current account surplus narrowed from about plus 2.5% of GDP in 2021 to about plus 1.0% in 2023. A renewed decline in commodity prices could return Australia to deficit.
Judgement. On balance, the surplus is a hybrid: a durable reduction in mining-related deficits, layered under a cyclical, commodity-price-driven surplus that is already fading - so full reversal to the old 4 to 6% deficit is unlikely, but a return to a small deficit is plausible if commodity prices fall further.
Marker's note: markers reward an explicit EXTENT judgement (not "yes it is structural" or "no it is cyclical" alone), evidence on both sides with a year attached (savings ratio 2020; CA balance 2021 vs 2023), and a reasoned, hedged conclusion rather than an absolute claim. An answer with no judgement, or evidence with no dates, cannot reach the top band.