IAS 21 The Effects of Changes in Foreign Exchange Rates: A Practical Guide

Foreign currency accounting catches out more finance professionals than almost any other area of IFRS. IAS 21 governs both individual transaction accounting and the translation of foreign operations — two distinct problems that require different treatments.

Functional Currency

The functional currency is the currency of the primary economic environment in which an entity operates. This is determined by facts, not policy choice. Key indicators include the currency in which sales prices and costs are denominated. The presentation currency may differ — a UK-listed group may present in GBP while subsidiaries operate in EUR, USD, or AED.

Translating Foreign Currency Transactions

At the transaction date, foreign currency items are recorded at the spot rate. At subsequent reporting dates: monetary items (cash, receivables, payables) are retranslated at the closing rate; non-monetary items at historical cost remain at the original rate; non-monetary items at fair value use the rate at the revaluation date. Exchange differences on monetary items go to profit or loss — with one important exception: differences on monetary items that form part of a net investment in a foreign operation go to OCI.

Translating Foreign Operations

When consolidating subsidiaries with different functional currencies: assets and liabilities are translated at the closing rate; income and expenses at the transaction date rate (or average rate); equity at historical rates. All resulting differences are recognised in OCI as the translation reserve. On disposal of the foreign operation, the cumulative translation reserve is recycled to profit or loss — a common source of error in group disposal accounting.

Common Practical Challenges

Determining functional currency for entities operating across multiple countries is often judgemental. Intra-group monetary balances — even if expected to be permanent — must be retranslated unless they meet the net investment criteria. Hyperinflationary economies require IAS 29 restatement before translation. And the interaction with IFRS 9 hedge accounting adds another layer for treasury-exposed groups.

Further Reading

• IFRS 10 Consolidated Financial Statements
• IAS 28 Associates and Joint Ventures
• Accounting Standards CPD

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