Strategic Business Reporting (International) · Foreign transactions and entities

IAS 21 Functional and Presentation Currency Explained

Updated 11 October 2026 · Fact-checked

An entity's functional currency is the currency of the primary economic environment in which it operates. IAS 21 tests it using primary indicators (sales prices, including competition and regulation, and costs) and secondary indicators (financing, retained receipts). Presentation currency is the currency of the financial statements. Any other currency is a foreign currency.

Understand IAS 21 Functional and Presentation Currency

Every entity must decide which currency it measures its results in. IAS 21 does not let management simply choose. It requires the functional currency: the currency of the primary economic environment in which the entity operates. That is usually the environment where it mainly generates and spends cash.

There are three currency terms to keep apart. The functional currency is used to measure transactions and record the entity's books. The presentation currency is the currency in which the financial statements are shown. A foreign currency is any currency other than the functional currency. So a currency can be foreign for one entity and functional for another.

An entity may present its financial statements in any currency it chooses. A group often picks the parent's functional currency, but it does not have to. If the presentation currency differs from the functional currency, the results must be translated. Translation is a separate step from deciding the functional currency.

IAS 21 gives indicators to judge the functional currency. IAS 21.9 gives the primary factors: sales prices, and labour, material and other costs. IAS 21.10 gives additional factors: the currency of financing and the currency in which operating receipts are retained. If the indicators are mixed and the answer is not obvious, management uses judgement and gives priority to the primary indicators. IAS 21.11 adds factors for a foreign operation, such as a subsidiary: whether it acts as an extension of the parent or with a significant degree of autonomy. These are additional factors, not primary ones.

Once set, the functional currency is not changed unless the underlying transactions, events and conditions change. If it does change, the change is applied prospectively from the date of change. Exam answers are marked on applying these indicators to the scenario facts, so always link each indicator to a fact.

Key rules to remember

Functional currency: Functional currency = currency of the primary economic environment in which the entity operates; Usually where the entity mainly generates and spends cash.
Primary indicators: Currency that mainly influences (1) sales prices, including the currency of the competitive forces and regulations that determine prices, and (2) labour, material and other costs; IAS 21.9 gives these primary factors. Look at the currency that drives prices and costs, not just the currency of invoices.
Secondary indicators: Currency in which (1) financing is raised, (2) operating receipts are retained; IAS 21.10 gives these as additional factors. Used as supporting evidence when the primary indicators do not give a clear answer.
Foreign operation indicators: Extension of parent? Degree of autonomy, share of transactions with parent, cash flows affecting parent, debt servicing; IAS 21.11 gives these as additional factors for a foreign operation, not primary ones. If the operation is an extension of the parent, its functional currency is likely to be the parent's.
Currency definitions: Foreign currency = any currency other than the functional currency; Presentation currency = currency of the financial statements; Presentation currency can be any currency the entity chooses.
Change of functional currency: Apply translation procedures of the new functional currency prospectively from the date of change; Only when underlying transactions, events and conditions change.

How to solve IAS 21 Functional and Presentation Currency questions

Use this approach for any question asking you to determine or discuss a functional currency or presentation currency.

1Identify each entity separately. The parent and each subsidiary may have different functional currencies.
2List the facts in the scenario: where it sells, who it competes with, where costs are incurred, how it is financed and where cash is kept.
3Sort the facts into primary indicators (sales prices, including competition and regulation; labour, material and other costs) and secondary indicators (financing, retained receipts).
4For a foreign operation, add the extension-of-parent factors: autonomy, volume of intragroup transactions, effect on parent cash flows and who services the debt.
5Conclude on the functional currency, giving priority to the two primary indicators. State that judgement is needed if the evidence is mixed.
6State the presentation currency separately and say whether translation is needed.
7Name any currency that is foreign for the entity, and explain the accounting consequence, such as translating transactions at the spot rate and exchange differences to profit or loss.
8Check for change: if circumstances have changed, say that the change is prospective.

Quickest way: Two-column indicator sort

When to use it: Use when a scenario gives many facts and you have limited time for a 4 to 8 mark discussion.

Draw two columns: currency A and currency B.
Tick each fact against the currency it points to: sales prices (including competition and regulation) and costs first, then financing and cash.
Count the primary ticks first. The currency with the stronger primary indicators wins.
Write one sentence per indicator, using the scenario fact and the currency it points to.
Finish with the conclusion, then one sentence on presentation currency.

Common mistakes in IAS 21 Functional and Presentation Currency

Treating the presentation currency as the functional currency.
Both relate to reporting and the group often uses the parent's currency for both.
Fix: Decide the functional currency from the economic environment. Then say separately which currency the statements are presented in.
Choosing the currency of the country where the entity is registered.
Location feels like the obvious answer.
Fix: Use the indicators. An entity registered in one country may price and incur costs mainly in another currency.
Giving equal weight to all indicators.
Students list indicators without ranking them.
Fix: State that primary indicators come first, and secondary indicators only support the conclusion when the picture is mixed.
Basing the answer only on the invoicing currency.
It is the most visible fact in the scenario.
Fix: Ask which currency actually drives selling prices and costs. Invoicing in a currency does not by itself make it functional.
Saying management can freely choose the functional currency.
Confusion with the free choice of presentation currency.
Fix: Functional currency is a fact-based determination. Only the presentation currency is a free choice.
Changing the functional currency retrospectively.
Students assume a correction restates earlier years.
Fix: A change in functional currency is applied prospectively from the date of change, and only when underlying conditions have changed.

Worked examples

Example 1

Kora, a subsidiary of a parent whose functional currency is the dollar, operates in Country K. It sells goods locally in the local currency (LC), and local competition and regulation set its selling prices. Most costs, including labour and materials, are incurred in LC. It raised a loan in dollars from the parent and keeps surplus cash in LC. It operates with considerable autonomy. Determine Kora's functional currency and explain which currencies are foreign.

Show the solution

Primary indicators: selling prices are set by local competition and regulation, so they point to LC. Labour and material costs are incurred in LC, so they also point to LC.
Secondary indicators: financing in dollars points to the dollar, but it is a secondary factor, so the primary indicators outweigh it. Cash receipts are retained in LC, which points to LC.
Foreign operation factors (IAS 21.11): Kora acts with considerable autonomy, which suggests it is not merely an extension of the parent. The parent loan is a factor to weigh here, because the question is whether Kora's debt is serviced from its own cash flows. The scenario does not say how the loan is serviced, but Kora earns its cash in LC. Given the primary indicators and Kora's autonomy, the loan does not outweigh LC.
Priority goes to primary indicators, which clearly point to LC, and the supporting evidence is largely consistent.
The dollar is a foreign currency for Kora, so the dollar loan from the parent is a foreign currency monetary item. In Kora's individual financial statements it is retranslated at the closing rate with exchange differences in profit or loss. This is so whether or not the loan forms part of net investment. The scenario does not say whether settlement is planned or likely, so no further treatment is assumed in the group accounts. The parent's loan receivable from Kora could form part of the parent's net investment in Kora only if settlement is neither planned nor likely in the foreseeable future. If so, the differences stay in profit or loss in Kora's own statements. In the consolidated statements they are reclassified to other comprehensive income and accumulated in equity until Kora is disposed of.

Answer: Kora's functional currency is LC. The dollar is a foreign currency in Kora's own books, so exchange differences on the dollar loan go to profit or loss in Kora's own statements. The scenario gives no net investment status for the loan, so no reclassification to other comprehensive income is assumed on consolidation. The dollar is the parent's functional currency, so Kora's results must be translated for consolidation.

Example 2

Delta is a parent with a dollar functional currency. It chooses to present its consolidated financial statements in euros, because most of its investors are in Europe. Explain whether this is permitted and the effect on the financial statements.

Show the solution

IAS 21 allows an entity to present its financial statements in any currency it chooses.
Delta's choice of euros is therefore permitted. Investor base is a reasonable commercial reason but is not a requirement.
The functional currency stays the dollar because it is determined by the economic environment, not by the presentation choice.
Delta records its transactions in dollars. It must then translate its results and position into euros for presentation.
Translation uses the IAS 21 procedures: assets and liabilities at the closing rate, income and expenses at the rates at transaction dates (or an average rate as an approximation), and exchange differences in other comprehensive income.

Answer: The choice is permitted. Delta's functional currency remains the dollar. Delta translates into euros for presentation, with the resulting exchange differences in other comprehensive income and accumulated in equity.

Exam tips

Always link each indicator to a fact from the scenario. Statements of the rule alone earn few marks.
Rank the indicators. Mention that primary indicators take priority and say why the secondary ones only support.
When a scenario is deliberately mixed, give a reasoned conclusion and acknowledge judgement. Do not leave the answer open.
Keep functional and presentation currency in separate sentences. Examiners often test whether you confuse them.
Add a professional skills point where the scenario suggests management may be choosing a currency to flatter results: apply scepticism and explain the rule that the determination is fact-based.

Practice questions from Foreign transactions and entities

IAS 21 Functional and Presentation Currency in other exams

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

IAS 21 Functional and Presentation Currency: frequently asked questions

What is the difference between functional and presentation currency?

Functional currency is the currency of the entity's primary economic environment and is used to measure its transactions. Presentation currency is the currency in which the financial statements are shown. The functional currency is determined by facts, but the presentation currency can be any currency the entity chooses.

How do I determine the functional currency under IAS 21?

Start with the two primary indicators: the currency that mainly influences sales prices (including the competition and regulation that set prices) and the currency that mainly influences labour, material and other costs. Then consider secondary indicators such as financing and the currency in which receipts are kept. For a foreign operation, also consider whether it is an extension of the parent.

Can a company change its functional currency?

Only if the underlying transactions, events and conditions relevant to it change. The change is applied prospectively from the date of change. It cannot be changed simply because management prefers another currency.

Do subsidiaries have the same functional currency as the parent?

Not necessarily. Each entity in a group determines its own functional currency. A subsidiary with a different functional currency from the group presentation currency has its results translated on consolidation.