GST on Foreign Exchange Conversion

GST on Foreign Exchange Conversion

GST at 18% on forex does not mean 18% of the money you send abroad. Under Rule 32(2) of the CGST Rules 2017, the 18% rate applies only to a small computed service value — not to the principal currency amount. On a Rs. 5 lakh LRS remittance, the actual GST is Rs. 540, not Rs. 90,000. This guide explains exactly how the slab method is calculated, how GST interacts with TCS under Section 206C(1G), and when your business can recover the GST as Input Tax Credit (ITC).

What GST Actually Taxes: The Service, Not the Currency

When an Authorised Dealer (AD) bank or Full Fledged Money Changer (FFMC) converts rupees into dollars — or vice versa — two economic events occur. First, the principal moves: you hand over rupees and receive foreign currency (or the equivalent remittance). Second, the dealer earns a margin by pricing the transaction away from the interbank or RBI reference rate and may levy an explicit service fee. GST applies exclusively to the second element — the economic value of the conversion service — not to the currency principal.

This distinction is commercially significant. A Rs. 10 lakh corporate remittance with an uninformed reading of "18% GST" implies an Rs. 1.8 lakh tax hit. The actual GST on the same transaction under the slab method is Rs. 990. Foreign currency is not "goods" for GST purposes under the CGST Act 2017, and the flow of the principal is not a supply of service. Only the dealer's service of conversion falls within the ambit of SAC code 997153 (foreign currency services) and attracts tax.

The authority: Section 2(102) of the CGST Act 2017 defines services as everything that is not goods and not money, meaning the act of converting money is a service even though money itself is excluded. Rule 32(2) of the CGST Rules 2017 then prescribes how to put a rupee value on that service for tax purposes.

Rule 32(2) of the CGST Rules — The Two Valuation Methods

Rule 32(2) gives the supplier — the bank or money changer — an option to choose between two methods to compute the taxable value of a forex conversion service. The supplier's choice is exercised transaction-by-transaction, though in practice most institutions apply one method consistently to a category of customer.

Method 1: RBI Reference Rate Differential

The taxable value is:

> (Bank's transaction rate − RBI reference rate) × Total units of foreign currency exchanged

If the RBI publishes no reference rate for the currency pair involved, the default taxable value is 1% of the gross rupee equivalent of currency exchanged.

Example (Method 1): You buy USD 2,000 at the bank's selling rate of Rs. 84.60 per USD. The RBI reference rate published that morning is Rs. 84.20. Margin per unit = Rs. 0.40. Taxable value = 0.40 × 2,000 = Rs. 800. GST at 18% on Rs. 800 = Rs. 144.

Method 1 rewards customers when bank spreads are narrow and competitive. For treasury-level corporate transactions where the bank rate closely tracks the RBI reference, Method 1 can yield a taxable value near zero. However, the customer cannot independently compute the tax without knowing the precise RBI reference rate used by the bank on that date — ask the bank to include this on the invoice.

Method 2: Slab-Based Valuation

Method 2 is the standard method used by most retail banks and FFMCs. It fixes the taxable value at a percentage of the gross rupee equivalent of currency exchanged, using stepped slabs with a floor and a cap.

The Slab Method — Full Rate Table and Calculation Logic

GST at 18% then applies to this taxable value. The gross amount is the full rupee equivalent of the transaction — for an outward remittance of USD 10,000 at Rs. 84.50, the gross amount is Rs. 8,45,000.

Three mechanics worth noting:

• The Rs. 250 minimum applies when 1% of gross amount is below Rs. 250, i.e., on transactions below Rs. 25,000. A Rs. 15,000 currency exchange produces a taxable value of Rs. 250 regardless, and GST of Rs. 45.
• The Rs. 60,000 cap means no single transaction can attract GST exceeding Rs. 10,800, regardless of transaction size. This cap kicks in at approximately Rs. 1.045 crore of gross currency equivalent.
• The slab structure is not cumulative the way income-tax slabs are — it applies to the entire transaction amount in a single bracket using the applicable formula.

Worked Examples — Three Scenarios With Real Numbers

Scenario 1: Tourist Buying Euros — Rs. 80,000

You purchase EUR 870 at an airport FFMC. The rupee equivalent is Rs. 80,000.

• Slab: ≤ Rs. 1,00,000 → 1% × Rs. 80,000 = Rs. 800 (above Rs. 250 floor)
• GST at 18% on Rs. 800 = Rs. 144
• Effective GST rate on your forex spend: 0.18%

Scenario 2: LRS Student Remittance — Rs. 5 Lakh

You remit Rs. 5,00,000 to a UK university account for your child's tuition, under LRS.

• Base for first Rs. 1,00,000: Rs. 1,000 (the fixed component of the middle slab)
• Remaining Rs. 4,00,000 × 0.5% = Rs. 2,000
• Taxable value = Rs. 1,000 + Rs. 2,000 = Rs. 3,000
• GST at 18% on Rs. 3,000 = Rs. 540
• Your actual GST cost on a Rs. 5 lakh remittance: Rs. 540

Scenario 3: Corporate Import Payment — Rs. 25 Lakh

A mid-size manufacturing firm settles a USD 29,500 import invoice. Rupee equivalent at prevailing rate: Rs. 25,00,000.

• Base for first Rs. 10,00,000: Rs. 5,500 (the fixed component of the top slab)
• Remaining Rs. 15,00,000 × 0.1% = Rs. 1,500
• Taxable value = Rs. 5,500 + Rs. 1,500 = Rs. 7,000
• GST at 18% on Rs. 7,000 = Rs. 1,260
• Since this is an import for a taxable business activity, the firm claims ITC of Rs. 1,260 — effective GST cost: nil, provided a valid tax invoice is in hand.

GST and TCS: Two Separate Tax Layers on LRS Transactions

Foreign remittances often carry two distinct tax charges that are routinely confused. GST is levied by the bank on its conversion service. Tax Collected at Source (TCS) under Section 206C(1G) of the Income-tax Act 1961 is collected by the AD bank on the gross remittance amount and is an advance payment of income-tax — fully creditable against your final tax liability when you file your ITR for AY 2027-28 (FY 2026-27).

TCS Rates on LRS Remittances (FY 2026-27)

Verify current rates against CBDT notifications before any high-value transaction — rates have been revised multiple times since the provision was introduced.

Why the Distinction Matters

On the Rs. 5 lakh student remittance (own funds, first remittance of the year):

• GST = Rs. 540 — this is a real cost, not recoverable for an individual
• TCS = Rs. 0 — below the Rs. 7 lakh annual threshold, so nothing collected

On a Rs. 12 lakh personal travel remittance:

• GST on the conversion service (Method 2): Rs. 1,000 + 0.5% × Rs. 11,00,000 = Rs. 6,500 taxable value → GST Rs. 1,170 — a permanent cost for the individual
• TCS at 20% on Rs. 5,00,000 (the amount above Rs. 7 lakh) = Rs. 1,00,000 collected by the bank — a tax credit recoverable in your ITR, not a final cost

The two charges are computed on entirely different bases and serve different purposes. Do not conflate them on your cost sheet.

When Your Business Can Claim Input Tax Credit

ITC eligibility follows Section 16 of the CGST Act 2017, subject to the blocked-credit list in Section 17(5). The test is always: was the forex conversion used in the course or furtherance of a taxable business activity?

ITC is available when:

• An importer converts INR to settle foreign currency invoices for raw materials or capital goods
• An IT or ITES exporter converts foreign currency receipts back to INR
• A company pays for overseas SaaS subscriptions, professional services, or business travel in foreign currency
• Any GST-registered firm pays for international conferences, trade fairs, or supplier visits abroad where the trip generates a taxable output

ITC is blocked when:

• The remittance is for personal leisure, family maintenance, or a student's living expenses
• The transaction involves purchase of overseas real estate or personal investments
• Section 17(5)(g) of the CGST Act applies — inputs used for personal consumption are ineligible

Practical test: If your CA would accept the underlying expense as deductible under Section 37 of the Income-tax Act, the ITC position on the GST component is generally defensible. However, document the business purpose explicitly — a brief internal memo or the invoice/contract from the overseas party is sufficient.

The procedural non-negotiable: ITC under Section 16(2)(a) requires a valid tax invoice from the AD bank or FFMC. A forex receipt, a debit advice, or a bank statement entry does not substitute. Without the tax invoice bearing the supplier's GSTIN, taxable value, GST rate, and GST amount, the credit is ineligible regardless of how business-related the transaction is.

Documentation You Must Collect and Retain

For every forex transaction — and especially for any transaction where ITC is intended — build a complete document chain:

1. Tax invoice from the AD bank or FFMC: must show GSTIN, SAC code (997153), taxable value computed under Rule 32(2) with the method identified, GST rate (18%), and amount split as CGST + SGST (intra-state) or IGST (inter-state).
2. Forex deal confirmation or transaction receipt: links the invoice to the currency pair, exchange rate, date, and counterparty.
3. A2 form (under FEMA for outward remittances by resident individuals and entities — specific to purpose codes prescribed by RBI).
4. Form 15CA and/or Form 15CB (under Section 195 / Rule 37BB of the Income-tax Rules): required for remittances chargeable to tax in India above specified thresholds; the CA's certificate in Form 15CB is needed for higher-value payments.
5. LRS declaration: the bank's form in the RBI-prescribed format, signed by the remitter, stating purpose and confirming the annual limit has not been exceeded.
6. Import invoice and Bill of Entry (for corporate importers): the customs document ties the foreign payment to the business purpose and supports the ITC claim.

Retention period: Maintain all forex-related documentation for six years from the end of the relevant assessment year — the outer limit for both income-tax scrutiny and GST audit under Section 66 of the CGST Act.

Special Cases: Forex Cards, Credit Cards Abroad, and SaaS Subscriptions

Prepaid Forex Travel Cards

Loading a prepaid forex card is a forex conversion service and attracts GST under the same Rule 32(2) slab framework. Each reload event is an independent supply — the slabs apply afresh to each loading amount. There is no annual aggregation for slab purposes (unlike TCS under LRS). If you load Rs. 50,000 on Monday and another Rs. 50,000 on Friday, each loading is taxed at 1% of Rs. 50,000 = Rs. 500 taxable value, not at the combined Rs. 1 lakh rate.

International Credit Card Spends

Each overseas credit card transaction triggers a forex conversion by the card-issuing bank. GST applies to the conversion margin under Rule 32(2). Since RBI's 2023 circular, international credit card spends by Indian residents are classified as LRS transactions, meaning they count toward the Rs. 7 lakh annual threshold for TCS purposes. Track your aggregate forex outflows — card spends, NEFT remittances, SWIFT transfers — across all accounts to manage your TCS position for FY 2026-27.

For business travellers using corporate cards: the GST component on overseas spends is potentially ITC-eligible, but the card issuer's monthly statement must be in tax-invoice format. Most banks provide this on request via their corporate banking portal.

Cross-Border SaaS and Cloud Subscriptions

An Indian GST-registered company paying a monthly subscription to a foreign SaaS vendor in USD faces two separate GST obligations:

1. RCM on OIDAR services under Section 5(3) of the IGST Act 2017 — if the foreign vendor is an Online Information and Database Access or Retrieval (OIDAR) service provider without GST registration in India, the Indian recipient self-charges IGST on the subscription amount under reverse charge. A self-invoice or payment voucher documents this liability, and ITC can typically be claimed in the same return period.
2. GST on the forex conversion service when the bank converts INR to USD to settle the payment — this is a separate supply by the bank, computed under Rule 32(2) and covered by the bank's own tax invoice.

Both generate ITC for the company. Maintain both documents separately — a single oversight (missing the bank's forex GST invoice) can result in an incomplete ITC claim on what appears to be a single procurement.

Common Mistakes and Pitfalls to Avoid

Accepting a receipt instead of a tax invoice. Many smaller forex outlets hand over a printed exchange receipt showing rate and amount but not the GSTIN, taxable value, or GST breakdown. This does not satisfy Section 16(2)(a) for ITC. At the counter, explicitly request a GST tax invoice — you are entitled to one for any taxable supply.

Believing 18% applies to the gross forex amount. This misreading — possibly from a poorly worded bank disclosure or an online calculation tool — overstates the real GST cost by a factor of 80 to 100 on a mid-size remittance. The effective rate is between 0.10% and 0.18% of the gross amount for most transactions.

Not tracking cumulative LRS outflows across all accounts. TCS under Section 206C(1G) applies to your aggregate LRS remittances across all AD banks in a financial year. Each bank individually tracks only its own disbursements. If Bank A remits Rs. 5 lakh and Bank B remits Rs. 4 lakh, Bank B should collect TCS on Rs. 2 lakh (the excess over Rs. 7 lakh total). In practice, without an integrated view, the second bank may miss this. The shortfall creates an underpayment risk that shows up when you file your ITR.

Claiming ITC on genuinely personal forex transactions booked under business travel. GSTIN searches and invoice matching are increasingly automated. A pattern of GST-registered individuals claiming ITC on forex invoices for periods that match school holidays or tourism seasons is an audit signal. The ITC claim requires a documentable business purpose — a conference registration, client meeting confirmation, or overseas project contract.

Using Method 1 without obtaining the RBI reference rate. If your bank uses Method 1, the tax invoice should state the RBI reference rate used and the margin per unit. An invoice that just shows "taxable value Rs. X" without the Method 1 working is incomplete and leaves you unable to verify the GST computation. For transactions above Rs. 5 lakh, always ask for the computation workings.

Failing to link Form 15CA/15CB with the GST invoice. The income-tax and GST documentation chains must be cross-referenceable. A GST invoice dated 15 May for a USD 50,000 remittance that cannot be matched to a Form 15CA with the same date, amount, and purpose code creates an unexplained gap if either a GST audit or an income-tax scrutiny is opened.

Key Takeaways

• GST at 18% applies only to a small computed service value under Rule 32(2) of the CGST Rules 2017 — never to the gross currency amount. The effective GST burden is typically 0.10% to 0.18% of the rupee amount transacted.
• Method 2 (slab-based) is the standard retail method: 1% up to Rs. 1 lakh (min Rs. 250); Rs. 1,000 + 0.5% of excess between Rs. 1–10 lakh; Rs. 5,500 + 0.1% of excess above Rs. 10 lakh, capped at Rs. 60,000 of taxable value (maximum GST: Rs. 10,800 per transaction).
• GST and TCS are entirely separate charges — GST is a final cost on the forex service; TCS under Section 206C(1G) is an advance income-tax credit on the gross LRS amount above Rs. 7 lakh, fully recoverable via ITR filing.
• Businesses can claim ITC on forex GST when the conversion is used for a taxable business purpose — import settlements, export-linked conversions, business travel, and SaaS payments all qualify. Personal transactions do not.
• A valid tax invoice from the AD bank or FFMC is the non-negotiable entry ticket for ITC — a receipt, debit advice, or statement entry is insufficient. Ask for it explicitly at the time of transaction.
• Forex cards, international credit card spends, and SaaS payments all carry embedded forex GST under the same Rule 32(2) framework and, since 2023, count toward the LRS annual TCS threshold.
• Retain the full documentation chain — tax invoice, deal confirmation, A2 form, Form 15CA/15CB, and LRS declaration — for six years from the end of the relevant assessment year to defend both GST and income-tax positions in scrutiny.