Corporate Financial Reporting · The Effects of Changes in Foreign Exchange Rates (Ind AS 21)

How to Determine Functional Currency under Ind AS 21

Updated 11 October 2026 · Fact-checked

Functional currency is the currency of the primary economic environment in which an entity generates and spends cash. Start with the primary indicators in paragraph 9: the currency driving sales prices and the currency driving labour, material and other costs. Use paragraphs 10 and 11 only as supporting evidence. Once fixed, change it only if underlying conditions change.

Understand Determining Functional Currency

Every entity must measure its transactions in some currency. Ind AS 21 calls this the functional currency. It is not a free choice or a matter of where the entity is registered. It is a fact you establish from how the business actually operates.

Paragraph 9 says the primary economic environment is normally the one in which the entity primarily generates and expends cash. You look at two things. First, the currency that mainly influences sales prices (often the currency in which prices are denominated and settled), and the currency of the country whose competitive forces and regulations mainly determine those prices. Second, the currency that mainly influences labour, material and other costs.

Paragraph 11 gives extra factors for a foreign operation (a subsidiary, branch, associate or joint arrangement). These test whether the operation is an extension of the reporting entity or runs with a significant degree of autonomy. You ask: is the activity an extension of the parent? Is the proportion of transactions with the reporting entity high or low? Do its cash flows directly affect the parent's cash flows and are they readily available for remittance? Can it service its debt from its own cash flows without help from the parent?

When the indicators are mixed and the answer is not obvious, paragraph 12 tells management to use judgement and choose the currency that most faithfully represents the economic effects of the underlying transactions, events and conditions. Priority goes to the primary indicators in paragraph 9 before the indicators in paragraphs 10 and 11, which only give additional supporting evidence.

Once determined, the functional currency is not changed at will. Paragraph 36 allows a change only if the underlying transactions, events and conditions change. For example, a change in the currency that mainly influences sales prices may lead to a change.

Key rules to remember

Primary indicators (para 9): Functional currency = currency that mainly influences (a) sales prices and (b) labour, material and other costs; These come first. Sales price influence includes the currency of the country whose competitive forces and regulations mainly determine prices.
Priority rule when indicators are mixed (para 12): Para 9 indicators first, then paras 10 and 11 as supporting evidence, then judgement; Judgement aims at the currency that most faithfully represents the economic effects of the underlying transactions, events and conditions.
Foreign operation indicators (para 11): Extension vs autonomy; high vs low share of transactions with reporting entity; cash flows affect and are remittable to parent; debt serviced without parent funds; Extension of the parent points to the parent's functional currency. Autonomy points to the local currency.
Change in functional currency (paras 35-37): Change only if underlying conditions change; apply prospectively; translate all items at the rate on the date of change; Translated non-monetary items become historical cost. Earlier OCI translation differences stay in equity until disposal of the operation.
Disclosure on change (Appendix 1): Disclose the fact, the reason and the date of change; Disclosing the date is an additional requirement in Ind AS 21 compared with IAS 21.

How to solve Determining Functional Currency questions

Use this order for any functional currency question, whether it is about a standalone entity, a foreign operation or a change.

1Identify the entity and whether it is a standalone entity or a foreign operation of a reporting entity.
2List the para 9 facts: the currency of sales prices, the country whose competitive forces and regulations set those prices, and the currency of labour, material and other costs.
3If the para 9 facts point to one currency, state it as the functional currency and justify it.
4If they are mixed, check the para 11 factors for a foreign operation: extension or autonomy, proportion of transactions with the parent, cash flow remittance and debt servicing.
5Apply para 12: give priority to para 9, treat other indicators as supporting, then use judgement for the most faithful representation.
6If the question is about a change, test whether the underlying transactions, events and conditions have changed. If not, no change is allowed.
7If a change is valid, translate all items at the rate on the date of change, treat translated non-monetary amounts as historical cost, apply prospectively and keep earlier OCI differences in equity.
8Write a clear conclusion and mention the disclosures: fact, reason and date of change.

Quickest way: Two-question screen

When to use it: For MCQs and short case questions where you must name the functional currency fast.

Ask: which currency drives selling prices? Ask: which currency drives costs?
If both match, that is the answer.
If they conflict, favour the para 9 facts, then use para 11 clues such as 'only sells goods imported from the parent and remits proceeds' (extension, parent's currency) or 'borrows and spends in local currency' (autonomy, local currency).
For change questions, look for a real change in business conditions. A change in management preference or reporting convenience is not enough.

Common mistakes in Determining Functional Currency

Choosing the currency of the country of incorporation or the currency of the parent's reporting by default.
Students treat functional currency as a legal or reporting label.
Fix: Decide from the cash-generating environment: sales prices and costs, as in para 9.
Giving para 10 and 11 indicators equal weight with para 9.
All indicators look like a checklist.
Fix: Remember para 12: primary indicators first. The others are supporting evidence only.
Treating the presentation currency as the functional currency.
Both words involve currency and appear in the same chapter.
Fix: Presentation currency is the currency of the financial statements. An entity can present in any currency, but its functional currency is determined by facts.
Allowing a change in functional currency because management wants it.
Students think it is an accounting policy choice.
Fix: Para 36 permits a change only when the underlying transactions, events and conditions change.
Restating comparatives or reclassifying old OCI exchange differences on a change.
Confusion with retrospective policy changes under Ind AS 8.
Fix: Apply the change prospectively. Earlier OCI differences stay in equity until disposal of the operation.
Forgetting the disclosure of the date of change.
Students recall only the IAS 21 disclosures.
Fix: Ind AS 21 requires disclosure of the fact, the reason and the date of change.

Worked examples

Example 1

Bharat Gears Ltd, an Indian company, has a wholly owned subsidiary in Sri Lanka. The subsidiary only sells gear boxes imported from Bharat Gears, at prices set by Bharat Gears, and remits all sale proceeds to it each month. It has no borrowings of its own. Determine the functional currency of the subsidiary, with reasons.

Show the solution

The subsidiary is a foreign operation, so the para 11 factors apply along with para 9.
Its activities are an extension of the reporting entity: it only sells imported goods and remits the proceeds. This is the example para 11(a) gives of an extension.
Transactions with Bharat Gears are a high proportion of its activities (para 11(b)), since all goods come from the parent.
Its cash flows directly affect the parent's cash flows and are readily available for remittance (para 11(c)).
It has no capacity to service debt from its own cash flows without parent funding (para 11(d)); it has no borrowings, and its operations depend on the parent.
Sales prices are set by the parent and costs are mainly the imported goods bought from the parent, which supports the parent's currency under para 9.

Answer: The functional currency of the subsidiary is the same as that of Bharat Gears Ltd, that is, the Indian rupee, because the subsidiary operates as an extension of the parent.

Example 2

Navkar Exports Ltd has had the rupee as its functional currency. From 1 October, its sales contracts are all priced and settled in US dollars, and the competitive forces of the US market now mainly set its prices. Materials and labour costs are still mainly in rupees. On that date the entity holds machinery (non-monetary) with a carrying amount of ₹50,00,000 and has OCI translation differences from an earlier foreign operation. The dollar rate on that date is ₹84 per US dollar. Discuss whether the functional currency can change and how it is accounted for.

Show the solution

Check para 36: a change is allowed only if the underlying transactions, events and conditions change. A change in the currency that mainly influences sales prices is given as an example.
Sales prices are now mainly influenced by the US dollar. Costs are mainly in rupees, so the indicators are mixed. Under para 12 the primary indicators in para 9 are weighed first, and management uses judgement to pick the currency that most faithfully represents the economic effects. The shift in the pricing environment is a genuine change in conditions, so a change to the US dollar can be supported if that judgement concludes so.
Accounting under paras 35 and 37 is prospective from the date of change, 1 October. No comparatives are restated.
All items are translated into the new functional currency at the rate on the date of change. The machinery of ₹50,00,000 becomes 50,00,000 ÷ 84 = US$59,523.81 (rounded) and this is treated as its historical cost.
OCI exchange differences from translating the earlier foreign operation stay in equity and are not reclassified to profit or loss until the operation is disposed of.
Disclose the fact of the change, the reason and the date of change.

Answer: A change is permissible because the currency mainly influencing sales prices has changed, if management's judgement under para 12 supports it. It is applied prospectively from 1 October. The machinery is translated at ₹84 per US dollar to about US$59,523.81 as new historical cost. Earlier OCI differences remain in equity until disposal of the operation. Disclose the fact, reason and date of change.

Exam tips

In case-based MCQs, underline the clue words: 'sales prices', 'costs', 'extension', 'autonomy', 'remits', 'borrows locally'. They point straight to the answer.
In written answers, cite para 9 first, then para 11 for foreign operations, then para 12 for priority. This ordering earns marks.
For change questions, always write three points: allowed only on change in underlying conditions, prospective application, and no reclassification of earlier OCI differences until disposal.
Do not confuse functional currency with presentation currency. State the difference in one line if the question mixes them.
End decision answers with a clear conclusion naming the currency.

Practice questions from The Effects of Changes in Foreign Exchange Rates (Ind AS 21)

Determining Functional Currency in other exams

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

Determining Functional Currency: frequently asked questions

Which indicators matter most when determining functional currency under Ind AS 21?

The primary indicators in paragraph 9 matter most: the currency that mainly influences sales prices and the currency that mainly influences labour, material and other costs. When indicators are mixed, paragraph 12 requires management to give priority to these before using the indicators in paragraphs 10 and 11.

How do you decide the functional currency of a foreign operation?

Apply the paragraph 9 factors and then the paragraph 11 factors. These ask whether the operation is an extension of the reporting entity or autonomous, how much it transacts with the reporting entity, whether its cash flows are remittable to it, and whether it can service its own debt. An extension points to the parent's currency, and an autonomous operation points to its local currency.

Can an entity change its functional currency?

Yes, but only if the underlying transactions, events and conditions change, as in paragraph 36. A change in the currency that mainly influences sales prices is an example. It cannot be changed merely by choice.

How is a change in functional currency accounted for?

It is applied prospectively from the date of change. All items are translated at the rate on that date, and translated non-monetary items are treated as historical cost. Exchange differences previously recognised in OCI on a foreign operation stay in equity until disposal of the operation.