Exporting from India may look simple under GST because exports are treated as zero-rated supplies. But the real complexity begins when foreign currency enters the picture. A small shift in exchange rates can quietly change your taxable value, alter refund calculations, and much more.
The rules around which exchange rate to use, when to apply it, and how it impacts Input Tax Credit (ITC) refunds are more important than many exporters realise. If these details are overlooked, even minor currency movements can lead to reporting gaps or refund mismatches.
What is the GST treatment for export transactions?
Under GST, exports of both goods and services are classified as “zero-rated supplies” under Section 16 of the Integrated Goods and Services Tax (IGST) Act, 2017. That means, although they are taxable in principle, the tax rate on the supply (exported invoice) itself is 0%.
Exporters still pay GST on inputs, which are goods or services they buy for making the exported products, but they are entitled to recover this tax. The GST allows two main routes for this:
- Export under Bond or Letter of Undertaking (LUT) without payment of IGST, and then claim a refund of unutilised ITC on the inputs used in exports.
- Export with payment of IGST, and then claim a refund of the IGST paid along with the eligible ITC. The refund, in this case, is of the IGST paid on exports; ITC is utilised to pay IGST and is not separately refunded again.
To qualify as an export of services, specific conditions under Section 2(6) must be met, including that the supplier is in India, the recipient is outside India, the place of supply is outside India, and payment is in foreign currency or permitted INR.
Role of currency exchange rates in export valuation under GST
For GST purposes, you must convert your foreign-currency invoice into INR using the exchange rate applicable to the transaction at the time of supply and the valuation rules laid down under GST law.
As per Rule 34 of the CGST Rules, the exchange rate for goods shall be the rate notified under Section 14 of the Customs Act, 1962. The Central Board of Indirect Taxes and Customs (CBIC) publishes the notified exchange rates that are commonly used for customs and valuation purposes.
For services, Rule 34 previously provided that the exchange rate shall be the RBI reference rate for the relevant date. Where such a rate is unavailable, the rate determined in accordance with generally accepted accounting principles may be used. However, after the amendment in 2025, Rule 34(2) specifies the GAAP-based exchange rate for services, not the RBI’s published rate.
For conversion purposes:
- Identify the time of supply by reviewing the invoice date, receipt of payment or earlier event as per Sections 12–13
- Take the GAAP-accepted rate for services.
- Multiply the foreign-currency amount by that rate to arrive at the taxable value in INR.
- If the contract locks in an INR amount or a forward exchange rate, disclose this and apply the same rate throughout.
Impact of currency fluctuation on GST liability
When you import or export goods and services, the exchange rate used to calculate their GST can change how much tax they owe or can claim back.
Imports
For imports, GST is levied on the customs value. It is calculated in INR by converting the foreign cost using the exchange rate notified by the central tax authorities on the date of clearance. If the INR declines against other currencies, the value of the rupee in imports rises. This increases the GST payable in INR even if the actual cost in foreign currency remains the same. On the other hand, a stronger INR reduces the GST amount.
Exports
For exports, GST is mostly zero-rated. However, exporters can claim refunds of ITC. The value of exported supplies is converted into rupees using an exchange rate prescribed under the GST law. If there is a sudden currency movement, it can affect the rupee value of exports and, in turn, the amount of ITC refund a business receives.
What challenges do exporters face due to exchange rate volatility?
Here are some of the challenges that exporters face due to a fluctuation in the exchange rate:
- Sudden movements in exchange rates can reduce the value of exporters’ earnings when converted into their home currency, which directly squeezes profit margins.
- When currency rates fluctuate frequently, exporters struggle to set stable prices, and repeated price changes can weaken customer trust and long-term relationships.
- When payments are received in one currency and expenses are incurred in another, a timing difference may arise. This creates cash-flow gaps that disrupt working capital management.
- Although tools such as forward contracts and options help protect profit margins, they come at a cost, and smaller businesses often find hedging relatively expensive.
- When foreign exchange risk increases, lenders may raise interest rates or shorten repayment terms, which puts pressure on exporters seeking trade finance.
- Due to uncertainty caused by currency volatility, businesses may postpone new investments or delay plans to expand production capacity.
- Unexpected currency gains or losses can alter the price competitiveness of exports, making products either more or less expensive in international markets.
- When foreign earnings are converted into the home currency for reporting purposes, companies may show fluctuating profits in their consolidated financial statements.
- In cases of extreme currency volatility, overseas buyers may withdraw from deals, and exporters may find it difficult to secure long-term contracts.
Conclusion
Currency volatility is beyond your control, but your GST process is not. Have an internal system to identify the correct time of supply, apply the legally prescribed exchange rate, and document the basis of conversion for every export invoice. Standardise this across finance, accounts and compliance teams to avoid mismatches between invoices, shipping documents and GST returns.
Where export volumes are high, automate exchange rate capture and reconciliation to reduce reporting gaps. Review pricing clauses in international contracts to better manage currency risk. A disciplined approach to valuation, refund tracking and documentation will protect your working capital and reduce the risk of notices or refund delays.
To avoid manual errors and keep your export GST calculations accurate, you can rely on TallyPrime to manage foreign currency invoices, exchange rate tracking and GST reporting smoothly.
