Multi-Currency Accounting: The Three Exchange Rates on Every Export Invoice

One invoice, three different rupee amounts

You raise an invoice for $10,000 on 5 May. The client pays on 20 June. Your year ends on 31 March with $4,000 still outstanding from a later invoice.

That single dollar figure produces at least three rupee amounts, and most small business books capture one of them. The gap between them is not rounding. On a services exporter turning over ₹4 crore, a 2 per cent currency move across a 45-day collection cycle is ₹8 lakh sitting somewhere it should not be.

What is multi-currency accounting?

Multi-currency accounting is the practice of recording transactions denominated in a foreign currency at the exchange rate on the transaction date, restating outstanding monetary balances at the closing rate on each reporting date, and recognising the resulting differences in the profit and loss account, in accordance with Accounting Standard 11.

The core idea in AS 11 is simple. A receivable in dollars is a claim on a fixed number of dollars, not a fixed number of rupees. As the rupee moves, the rupee value of that claim moves with it, and that movement is a gain or loss you have actually experienced.

Key terms explained

• Monetary items: money held, and assets and liabilities to be received or paid in fixed or determinable amounts of money. Trade receivables, trade payables, loans and bank balances in foreign currency are monetary.
• Non-monetary items: fixed assets, inventory and equity investments. These stay at the rate on the date of the transaction and are not retranslated.
• Exchange difference: the difference arising from reporting the same number of units of a foreign currency at different exchange rates.
• Closing rate: the rate at the balance sheet date, used to retranslate monetary items.
• Realised difference: the difference crystallised when the money is actually received or paid.
• Unrealised difference: the difference on a balance still outstanding at the reporting date.

The three rates, in order

Rate one, the invoice date. Record revenue and the receivable at the exchange rate on the date of the transaction. This is the rupee figure that enters your turnover and never changes afterwards. Revenue is not restated when the currency moves.

Rate two, the receipt date. When the money arrives, the rupee value received will differ from the rupee value recorded. That difference is a realised exchange gain or loss. It goes to the profit and loss account, not against revenue.

Rate three, the reporting date. Any invoice still open at the balance sheet date is retranslated at the closing rate under AS 11. The difference is an unrealised gain or loss, and it is recognised in the profit and loss account even though no cash has moved.

There is a fourth rate that trips people up: the rate your bank actually gave you, which includes a spread. The difference between the RBI reference rate and the bank’s rate is a bank charge in substance, and separating it from the genuine currency movement is what lets you see what your banking actually costs.

Why the GST return will not agree

For GST purposes, Rule 34 of the CGST Rules 2017 prescribes the rate of exchange to be used for determining the value of a supply. It is applied on the date of time of supply, and it is not necessarily the rate your accounting software pulled or the rate your bank applied.

So the same $10,000 invoice can carry one rupee value in GSTR-1 and a slightly different rupee value in your books.

This is not an error to be eliminated. It is a structural difference to be reconciled and documented, so that when the annual return is prepared the gap between books turnover and GST turnover has an explanation attached to it. The zero-rating position itself is covered in how export of services is zero-rated.

The monthly process

Step 1: Fix your rate source and write it down. RBI reference rate, or your bank’s card rate, or the software’s default feed. Pick one, apply it consistently, and record the policy. Auditors ask.

Step 2: Record every foreign currency invoice at the transaction date rate. Post the foreign currency amount and the rupee amount on the same voucher, so both are visible.

Step 3: Post receipts at the actual rate received. Take the rupee credit from the bank, not from the rate table.

Step 4: Split the bank spread from the currency movement. Compare the reference rate on the receipt date against the rate the bank applied. The gap is a bank cost. The rest is exchange difference.

Step 5: Retranslate open monetary balances at each month end. Do not wait for the year end. A monthly restatement keeps the management accounts honest and turns the March exercise into a formality.

Step 6: Keep exchange differences out of revenue. They belong in other income or finance cost, never netted against sales.

Step 7: Reconcile books turnover to GST turnover monthly. Document the Rule 34 difference so it does not have to be reconstructed in September.

Step 8: Tie the receivable ledger to the FIRC file. Every open export invoice should map to either a pending receipt or a certificate, which also protects your position under Rule 96A.

What you need on file

• Written exchange rate policy naming the source
• Foreign currency invoice register showing currency, foreign amount, rate and rupee amount
• Bank advices for every inward remittance
• FIRC or eFIRA for each export receipt
• Month-end retranslation working
• Books-to-GST turnover reconciliation
• Ageing report of open foreign currency receivables

Treatment at a glance

Common mistakes

• Netting exchange differences against sales. Revenue moves with the currency, gross margin becomes meaningless, and the GST reconciliation breaks. Exchange differences are a separate line.
• Retranslating only at year end. Eleven months of management accounts are wrong and March carries a single large adjustment nobody can explain. Retranslate monthly.
• Retranslating non-monetary items. Fixed assets bought in dollars drift in value every year and depreciation stops reconciling. Apply the monetary and non-monetary test first.
• Treating the bank spread as a currency movement. The cost of your banking arrangement stays invisible, sometimes for years. Split it out at every receipt.
• Recording only the rupee amount. Nobody can retranslate anything, because the original currency amount is gone. Post both amounts on the voucher, which every mainstream package supports.

Tax consequences

Exchange differences arising on revenue account items, such as trade receivables and trade payables, are generally taxable or deductible as business income or expenditure in the year in which they arise.

Exchange differences arising on capital account items follow the treatment applicable to the underlying asset or liability rather than being taken to the profit and loss account for tax purposes, and the distinction between revenue and capital account is decided on the character of the underlying item.

Under Section 63 of the Income-tax Act 2025, the tax auditor reports on the books maintained and the method of accounting followed, so an inconsistently applied exchange rate policy is visible in the audit report rather than buried in the ledgers. That report now also asks where your electronic books must be stored.

Where books turnover and GST turnover differ, the reconciliation is required at the annual return stage, and an unexplained difference is a standard trigger for departmental scrutiny.

How these provisions interact

Accounting Standard 11 fixes revenue at the transaction date rate and requires monetary items to be retranslated at the closing rate, while Rule 34 of the CGST Rules 2017 prescribes a separate rate for valuing the same supply, so a difference between books turnover and GST turnover is structural rather than an error.

The realisation requirement in Rule 96A of the CGST Rules operates on the foreign currency amount of the export invoice, while AS 11 operates on its rupee equivalent, which is why the receivable ageing report serves both the accounting close and the GST position.

Section 133 of the Companies Act 2013 gives statutory force to the notified accounting standards, so a company applying an inconsistent exchange rate policy has a Companies Act problem alongside an income tax one.

Key takeaways

• Accounting Standard 11 requires foreign currency transactions to be recorded at the exchange rate on the transaction date, with monetary items retranslated at the closing rate on each reporting date and the resulting exchange differences taken to the profit and loss account.
• Revenue is fixed at the invoice date rate and is never restated for subsequent currency movement, so realised and unrealised exchange differences must be presented separately rather than netted against sales.
• Rule 34 of the CGST Rules 2017 prescribes the rate of exchange for valuing a supply under GST, which means the rupee value of an export invoice in GSTR-1 can legitimately differ from the rupee value in the books, and that difference must be reconciled and documented.
• Monetary items such as trade receivables and foreign currency bank balances are retranslated at the closing rate, while non-monetary items such as fixed assets and inventory remain at the rate on the date of the original transaction.

Frequently asked questions

If your books only hold rupees

The common pattern we see is a services exporter whose ledgers hold rupee amounts alone, with the currency amount living in a spreadsheet somebody left behind. Nothing reconciles after that, and the year-end adjustment becomes a guess. Fixing it is a rebuild of the invoice register plus a disciplined monthly close, and if you bill on subscription, recognising subscription revenue correctly sits on top of the same ledgers.