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Direct and Indirect Taxation · Taxation of Individuals (including AMT) and HUF

Taxation of Foreign Exchange Fluctuation under Section 43

Updated 10 October 2026 · Fact-checked

Under section 43 of the Income-tax Act, 2025, any gain or loss from a change in foreign exchange rates on foreign currency transactions is treated as income or loss. You compute it as per the notified income computation and disclosure standards (ICDS), subject to section 42. Identify the item, apply the ICDS rule, then tax the gain or allow the loss.

Understand Taxation of Foreign Exchange Fluctuation

When a business buys, sells, borrows or lends in a foreign currency, the rupee value of that transaction changes as the exchange rate moves. The difference between the rupee value on two dates is a foreign exchange gain or loss. Section 43 says how the tax law treats it.

The rule is short. Subject to section 42, any gain or loss arising on account of change in foreign exchange rates on foreign currency transactions is treated as income or loss, as the case may be. It is computed as per the income computation and disclosure standards notified under section 276(2). So the Act gives the principle, and the ICDS give the working method.

Section 43(2) widens the scope. The rule applies to all foreign currency transactions, including those relating to:

  • monetary items and non-monetary items;
  • translation of financial statements of foreign operations;
  • forward exchange contracts; and
  • foreign currency translation reserves.

The words "subject to the provisions of section 42" matter. Section 42 is not in the text supplied to you here, so do not quote what it says. In your answer, just note that section 43 operates subject to it, and that any specific rule there would take priority.

The exam point: do not treat a forex difference as an accounting entry only. The tax law itself says it is income or loss, and you compute it using the ICDS method, not simply by copying the books.

Key rules to remember

Core rule of section 43(1)
Forex gain or loss on foreign currency transactions = income or loss, computed as per ICDS notified under section 276(2)
Applies subject to section 42. The gain is income; the loss is a loss.
Scope under section 43(2)
Covers: monetary items and non-monetary items; translation of financial statements of foreign operations; forward exchange contracts; foreign currency translation reserves
Learn the four heads of scope as a list. Examiners often ask which items are covered.
Basic gain/loss working
Rupee difference = Foreign currency amount × (rate on later date − rate on earlier date)
A working aid, not a formula in the Act. For an amount receivable, a higher later rate is a gain; for an amount payable, a higher later rate is a loss. Check the rates and dates the ICDS requires in the question.

How to solve Taxation of Foreign Exchange Fluctuation questions

Use this order for any question on forex gain or loss. It keeps you on the Act's wording and gives step marks.

  1. 1Confirm there is a foreign currency transaction and note the foreign currency amount.
  2. 2Classify each item: monetary or non-monetary, forward contract, foreign operation translation, or translation reserve. These are the categories listed in section 43(2).
  3. 3Pick out the exchange rates and dates given in the question, such as transaction date and reporting date or settlement date.
  4. 4Compute the rupee difference per item as foreign currency amount × change in rate, as per the ICDS method the question expects.
  5. 5Decide whether each difference is a gain or a loss. Check direction: receivable versus payable.
  6. 6State that under section 43(1) the gain is treated as income and the loss as loss, subject to section 42.
  7. 7Add the net result to the relevant computation and give a one-line conclusion.

Quickest way: Receivable or payable direction check

When to use it: Use in numerical questions with one or two foreign currency items and limited time.

  1. Write the foreign amount and the two rates in a single line.
  2. Find the difference in rate and multiply by the foreign amount.
  3. Receivable: rate up means gain, rate down means loss.
  4. Payable: rate up means loss, rate down means gain.
  5. Write one sentence citing section 43(1) and ICDS, then state the net figure.

Common mistakes in Taxation of Foreign Exchange Fluctuation

  • Treating forex gain or loss as only an accounting entry with no tax effect.

    Students see it passing through the books and assume tax follows automatically or not at all.

    Fix: State that section 43(1) itself treats the gain or loss as income or loss, computed as per ICDS.

  • Getting the direction wrong for payables.

    Students apply the receivable logic to every item.

    Fix: Ask first: do I receive or pay foreign currency? A rising rate helps receivables and hurts payables.

  • Leaving out forward contracts, foreign operations or translation reserves.

    Students think forex only means converting a debtor or creditor balance.

    Fix: Recall the four categories in section 43(2) and check each against the question.

  • Quoting the old section number or the 1961 Act.

    Older notes use the earlier numbering.

    Fix: Use the Income-tax Act, 2025 and refer to section 43 and the notified ICDS under section 276(2).

  • Ignoring the words 'subject to section 42'.

    Students memorise the main rule and skip the opening phrase.

    Fix: Write that section 43 operates subject to section 42. Do not invent what section 42 says.

Worked examples

Example 1

A business exports goods on credit and has a receivable of US$ 10,000. The rate on the transaction date is ₹82 per US$ and the rate on the date of settlement is ₹84 per US$. Compute the exchange difference and state its treatment under section 43.

Show the solution
  1. Receivable in foreign currency: US$ 10,000.
  2. Rupee value on transaction date = 10,000 × 82 = ₹8,20,000.
  3. Rupee value on settlement date = 10,000 × 84 = ₹8,40,000.
  4. Difference = ₹8,40,000 − ₹8,20,000 = ₹20,000.
  5. The business receives more rupees on a receivable, so this is a gain.
  6. Under section 43(1), the gain from change in foreign exchange rates on a foreign currency transaction is treated as income, computed as per ICDS and subject to section 42.

Answer: Forex gain of ₹20,000, treated as income under section 43(1).

Example 2

A company has a payable of Euro 5,000 for imported material. The rate on the transaction date is ₹90 per Euro and the rate on the payment date is ₹93 per Euro. Find the exchange difference and its treatment under section 43.

Show the solution
  1. Payable in foreign currency: Euro 5,000.
  2. Rupee value on transaction date = 5,000 × 90 = ₹4,50,000.
  3. Rupee value on payment date = 5,000 × 93 = ₹4,65,000.
  4. Difference = ₹4,65,000 − ₹4,50,000 = ₹15,000.
  5. The company pays more rupees on a payable, so this is a loss.
  6. Under section 43(1), a loss arising from change in foreign exchange rates is treated as loss, computed as per ICDS and subject to section 42.

Answer: Forex loss of ₹15,000, treated as loss under section 43(1).

Exam tips

  • Quote section 43(1) and section 43(2) by number, and mention ICDS under section 276(2).
  • Show the rupee value on both dates before stating the difference. Step marks come from the working.
  • For theory, list the four items in section 43(2) in order.
  • Always state gain or loss and the direction logic in one line, then give the final figure.
  • Write 'subject to section 42' in your answer, but do not describe section 42 beyond that.

Practice questions from Taxation of Individuals (including AMT) and HUF

Taxation of Foreign Exchange Fluctuation in other exams

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

Taxation of Foreign Exchange Fluctuation: frequently asked questions

What does section 43 of the Income-tax Act, 2025 say?

It says any gain or loss from a change in foreign exchange rates on foreign currency transactions is treated as income or loss. It is computed as per the income computation and disclosure standards notified under section 276(2). It applies subject to section 42.

Which items are covered under section 43?

Section 43(2) covers all foreign currency transactions, including monetary and non-monetary items, translation of financial statements of foreign operations, forward exchange contracts, and foreign currency translation reserves.

Is a forex gain always taxable and a forex loss always deductible?

Section 43(1) treats the gain as income and the loss as loss, but it works subject to section 42 and the ICDS method. So check those provisions and the question facts before concluding.

Which Act should I use for this topic in CMA Inter?

Use the Income-tax Act, 2025 for tax year 2026-27, with section 43. Do not cite the 1961 Act or use the term assessment year.