Financial Reporting · Foreign currency transactions

IAS 21 Functional and Presentation Currency Explained for ACCA

Updated 11 October 2026 · Fact-checked

Functional currency is the currency of the primary economic environment in which an entity operates, decided by judging indicators such as sales prices, costs and financing. Presentation currency is the currency the financial statements are shown in. Entities may choose it freely. Any other currency is a foreign currency under IAS 21.

Understand IAS 21 Functional and Presentation Currency

Every entity must decide which currency is its functional currency before it can account for foreign currency items. IAS 21 defines it as the currency of the primary economic environment in which the entity operates. That is normally the environment where it mainly generates and spends cash.

The presentation currency is the currency in which the financial statements are presented. It is a choice. A company can have a functional currency of dollars and present its statements in euros, for example, if its investors prefer euros. The functional currency is a matter of fact and judgement. The presentation currency is a matter of choice.

Any currency other than the functional currency is a foreign currency. A transaction in a foreign currency is first recorded in the functional currency. So an entity with a functional currency of dollars records a purchase priced in euros by translating it into dollars. The choice of functional currency therefore decides which items give rise to exchange differences.

IAS 21 gives indicators to help management decide. The main ones are the currency that influences sales prices, the currency of the country whose competitive forces and regulations mainly set prices, and the currency that mainly influences labour, material and other costs. Secondary indicators are the currency in which financing is raised and the currency in which receipts from operating activities are kept. For a foreign operation, further factors apply: how autonomous it is from the parent, how much it trades with the parent, whether its cash flows directly affect the parent, and whether it can service its own debt.

Once chosen, 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. IAS 21 also deals with translating results into a presentation currency, with a different method from the one used for transactions. Entities in the exam usually have a functional currency stated in the question, so your job is often to apply it correctly.

Key rules to remember

Functional currency: Currency of the primary economic environment in which the entity operates; Decided by judgement using primary indicators first (sales prices, costs), then secondary ones (financing, retained receipts).
Presentation currency: Currency in which the financial statements are presented; A free choice. It can differ from the functional currency.
Foreign currency: Any currency other than the entity's functional currency; Transactions in it are first recorded in the functional currency.
Initial recording: Foreign currency amount ÷ exchange rate (or × rate, depending on how the rate is quoted); Use the spot rate at the date of the transaction. Check how the rate is quoted before you divide or multiply.
Change in functional currency: Apply the new functional currency prospectively from the date of change; Only allowed when underlying transactions, events and conditions change.

How to solve IAS 21 Functional and Presentation Currency questions

Use this method for any question on functional and presentation currency.

1Identify the entity and the currency stated for its financial statements. Separate this from the currency used for each transaction.
2Look for evidence of the primary economic environment: the currency of sales prices, the currency of the main costs and the country whose competition and regulation set prices.
3Weigh the primary indicators first. Use secondary indicators (financing, retained receipts) only to support or break a tie.
4For a foreign operation, consider autonomy, the share of transactions with the parent, the effect on parent cash flows and the ability to service its own debt.
5State the functional currency and give your reason using the facts in the scenario.
6Identify the presentation currency, noting that it is chosen and may differ.
7Classify each transaction currency as functional or foreign, then record foreign items in the functional currency at the spot rate on the transaction date.

Quickest way: Follow the sales and costs

When to use it: Use in Section A or Section B objective questions where you must pick the functional currency or classify statements as true or false.

Find the currency of selling prices and main costs. That is usually the answer.
Ignore the currency of the financial statements. It is the presentation currency, not the functional currency.
Treat financing currency as a weaker clue. It does not override sales and costs.
For a true or false statement, check whether it says presentation currency is a free choice (true) or must equal functional currency (false).

Common mistakes in IAS 21 Functional and Presentation Currency

Assuming the functional currency is the currency of the country where the entity is registered.
Students link currency to location rather than to the operating environment.
Fix: Base it on where sales prices and costs are mainly denominated. Registration location is not a stated indicator.
Treating presentation currency as the same thing as functional currency.
The two are often the same in simple questions, so students merge them.
Fix: Keep two labels. Functional is a judgement about operations. Presentation is a choice about reporting.
Letting the financing currency decide the functional currency.
A loan in a foreign currency looks like a strong signal.
Fix: Financing is a secondary indicator. Give priority to sales prices and costs.
Recording a foreign currency purchase in the foreign currency rather than the functional currency.
Students forget that initial recording is in the functional currency.
Fix: Translate at the spot rate on the transaction date and record the result in the functional currency.
Multiplying when the rate requires dividing, or the reverse.
Rate quotes such as ₹80 = $1 versus $1 = ₹80 are read quickly.
Fix: Write the rate as 1 unit of the functional currency = X units of foreign currency, then check the answer is sensible.
Changing the functional currency because exchange rates moved.
Students think a weaker currency justifies a switch.
Fix: A change is only allowed when the underlying transactions, events and conditions change, and it is applied prospectively.

Worked examples

Example 1

Delta Co is incorporated in Country A, whose currency is the A-dollar. It sells goods almost entirely to customers in Country B and prices them in B-francs. Its main costs, wages and materials, are in B-francs. It borrowed in A-dollars. Delta's financial statements are presented in A-dollars for its parent. State its functional currency and presentation currency, and explain.

Show the solution

Primary indicators: selling prices are in B-francs and the main costs are in B-francs.
Secondary indicator: financing is in A-dollars. This is weaker and does not override the primary indicators.
So the primary economic environment is that of the B-franc.
The statements are presented in A-dollars. That is a choice made to suit the parent.

Answer: Functional currency is the B-franc. Presentation currency is the A-dollar. The A-dollar loan is a foreign currency item for Delta.

Example 2

Echo Ltd has a functional currency of the dollar ($). On 10 March it bought inventory from a supplier for €60,000 when the spot rate was €1.20 = $1. State how the purchase is recorded and why.

Show the solution

The euro is not Echo's functional currency, so it is a foreign currency transaction.
Initial recording is in the functional currency at the spot rate on the transaction date.
Convert: €60,000 ÷ 1.20 = $50,000.
Record inventory at $50,000 and a payable of $50,000, subject to later retranslation of the payable.

Answer: Inventory and the payable are initially recorded at $50,000.

Exam tips

Read the scenario for the currency of sales prices and costs. Questions usually plant these as clues, with a distracting loan or parent currency.
In objective test questions, watch for the word 'must'. Presentation currency does not have to equal functional currency.
Always state your reason in Section C. A bare answer with no link to the facts loses marks.
Check how the exchange rate is quoted before you convert. Then ask whether the result looks sensible.
Link this topic to initial recognition and reporting date retranslation, since functional currency decides what counts as foreign.

Practice questions from Foreign currency transactions

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, decided by judgement. Presentation currency is the currency chosen for the financial statements. They can be different.

How do I determine functional currency in the ACCA exam?

Look at the currency of sales prices and main costs first. Then use financing and retained receipts as supporting evidence. State the answer and give your reason from the scenario.

Can an entity have more than one functional currency?

IAS 21 expects one functional currency for an entity. Different entities in a group may each have their own. Each entity decides its own based on its operating environment.

Can the functional currency be changed?

Only if the underlying transactions, events and conditions change. The change is applied prospectively from the date of the change, not by restating earlier periods.