Exchange rates, spreads and the cost of sending money
Why the rate you get is never the rate you looked up, where the fee hides when a service advertises zero fees, and what actually determines the cost of a transfer.
Last reviewed · 1,320 words
In short
- The mid-market rate is the midpoint between buy and sell. Nobody trades at it, and every provider's rate is worse by a margin.
- The margin is the real cost. A "zero fee" transfer with a 3% spread costs more than a ₹500 fee at the mid-market rate on most amounts.
- Airport exchange counters take 8% to 15%. They are the most expensive way to change money anywhere.
- Card transactions abroad add a foreign transaction fee of 2% to 3.5%, plus a network markup, plus dynamic currency conversion if you accept it.
- Always decline dynamic currency conversion. Paying in the local currency is cheaper every time.
The exchange rate you see on a search engine is the mid-market rate: the midpoint between what buyers are bidding and what sellers are asking in the interbank market. It is the honest reference price, and no retail customer ever gets it.
Everything between that number and what you actually receive is the cost of the transaction, however it is labelled.
Where the cost hides
Three components, and providers vary in which they emphasise.
The spread, or margin — the gap between the mid-market rate and the rate offered. Usually the largest cost and usually not stated as a cost at all.
The stated fee, a flat charge or a percentage.
Correspondent bank charges, on international wires, where an intermediary bank deducts its own fee in transit. The recipient gets less than the sender was told, and neither is informed in advance.
A provider advertising "zero commission" is earning entirely on the spread. On a ₹1,00,000 conversion, a 3% spread is ₹3,000 — considerably more than most explicit fees.
The only way to compare providers is to ask what the recipient actually receives. That single number contains every cost.
Typical margins
| Method | Typical margin over mid-market |
|---|---|
| Airport exchange counter | 8% – 15% |
| Bank branch, cash | 4% – 8% |
| Bank wire transfer | 3% – 5% |
| Credit or debit card abroad | 2% – 4% including fees |
| Specialist transfer service | 0.4% – 1.5% |
| Multi-currency card at interbank | 0.3% – 0.7% |
On ₹1,00,000, the difference between the top and bottom rows is roughly ₹12,000. Same money, same destination, entirely different amount arriving.
Airport counters are the worst deal available anywhere in retail finance. They charge for convenience and captivity, and the margin is worst at the arrivals hall of an airport in a country whose currency you need immediately.
Using cards abroad
Three charges can stack on a single transaction.
Foreign transaction fee, 2% to 3.5% on most Indian cards, charged by the issuer. Some travel-focused cards waive it, and that waiver is the main thing worth checking before a trip.
Network markup, typically 0.2% to 1%, applied by Visa or Mastercard on their own conversion.
Dynamic currency conversion, if you accept it.
Always decline dynamic currency conversion. When a terminal abroad offers to charge you in rupees instead of the local currency, it is offering to do the conversion itself at a rate it chooses — typically 3% to 7% worse than your card's. The screen presents it as helpful certainty. Choosing the local currency is cheaper in every case.
The same offer appears on international websites at checkout, with the same answer.
Cash withdrawals abroad add a further ATM fee at both ends, and on a credit card they are treated as a cash advance: interest from day one with no grace period, plus a cash advance fee.
Why rates move
Interest rate differentials. Capital flows towards higher real rates, so a central bank raising rates tends to strengthen its currency. This is the dominant driver over months.
Inflation differentials. Higher inflation erodes purchasing power and, over long periods, the currency.
Trade and current account balances. A country importing far more than it exports must buy foreign currency to pay for it, which pressures its own.
Capital flows. Foreign investment into equities and bonds is a large and volatile driver for the rupee specifically.
Central bank intervention. The RBI actively manages rupee volatility by buying and selling dollars from reserves, which is why the rupee moves less abruptly than a freely floating currency would.
The rupee has depreciated against the dollar at roughly 3% to 4% a year on average over long periods, which is approximately the inflation differential between the two countries. That is not a prediction — it is the mechanism, and it is why long-horizon plans involving foreign currency should assume drift rather than stability.
Sending money to and from India
Inward remittances are the world's largest by volume. Charges vary widely by corridor and provider, and the cheapest route is rarely the bank at either end.
Outward remittances fall under the Liberalised Remittance Scheme: up to $250,000 per person per financial year for permitted purposes — education, travel, medical treatment, investment, gifts to relatives.
Tax collected at source applies to outward remittances above ₹10 lakh in a year, at 20% for most purposes and 5% for education and medical treatment funded by a loan. TCS is not a tax — it is credited against your income tax liability and refundable if you overpaid — but it is cash that leaves now and returns at the end of the year.
Form A2 and a declaration are required for most outward remittances, and the purpose code determines both the documentation and the TCS rate.
Practical rules
Never change money at an airport beyond the minimum needed to reach your accommodation.
Compare on what arrives, not on the advertised rate or the fee.
Use a card with no foreign transaction fee where one is available, and decline dynamic currency conversion every time.
Carry a small amount of local cash for places that do not take cards, obtained from a bank ATM rather than a counter.
For large or recurring transfers, a specialist service will usually beat a bank by 2% to 4%, which on a college fee or a property payment is a substantial amount.
Check the rate on the day of settlement, not the day of instruction. Wires take one to three business days and the rate applied is generally the one at execution, unless the provider locks it.
Multi-currency cards and travel accounts
A prepaid forex card or a multi-currency account is loaded in advance and spends at the loaded rate.
The advantage is that the rate is fixed on the day you load, so a trip is budgeted in rupees with no exposure to movement while you are away. Most also avoid the foreign transaction fee entirely.
The costs are an issuance fee, a reload fee, an ATM withdrawal fee abroad, an inactivity charge on some cards, and a cross-currency fee if you spend in a currency the card is not loaded in — that last one catching people who load euros and then travel to Switzerland.
Refunding the unused balance attracts its own charge and converts back at the provider's rate, so the leftover is worth spending rather than returning.
Whether locking the rate helps depends on which way the currency moves, which is not knowable. The genuine benefits are the fee waiver and the budgeting certainty, not the rate itself.
Reading a quote correctly
Currency pairs are quoted as base/quote: USD/INR 87.50 means one dollar buys 87.50 rupees. The base is always one unit.
A rising USD/INR means the dollar is strengthening and the rupee weakening. The same event stated as INR/USD falling can read as the opposite if you are not watching which way round the pair is.
Buy and sell rates are quoted from the provider's perspective, not yours. The rate at which the bank buys dollars is the rate you get when selling them, and it is the worse of the two for you. A board showing 86.80 buy and 88.20 sell has a 1.6% spread, and you are on the wrong side of it in both directions.
The gap between the two numbers is the clearest single indicator of how expensive a provider is, and it is displayed openly at every counter.
What this calculator assumes
- Conversion at the rate you enter or the reference rate shown, which is close to mid-market.
- No provider margin, transfer fee, correspondent charge or card fee is applied — add them yourself to see the real cost.
- Rates change continuously during market hours and the figure here is a snapshot rather than a live quote.
- Cross rates between two non-dollar currencies are derived through the dollar, which is how the market itself works.
- For an amount that matters, get a firm quote from the provider before committing.