A Sarf contract is the sale of one currency against another, originally gold and silver and today modern money, and it is valid only if both counter-values are delivered before the parties separate. When the same currency is exchanged the amounts must be equal, while between two different currencies the rate is freely agreed. Any delay in delivery makes the exchange void.
Six goods, two rules: the basis of the Sarf contract in the hadith
The Prophet listed gold, silver, wheat, barley, dates and salt, requiring equality and hand-to-hand delivery when one of them is exchanged for the same kind. Sarf applies this rule to monetary goods, namely gold and silver.
Why banknotes and currencies follow the rules of gold
Most contemporary jurists and the fiqh academies consider that fiat money serves as a price, as gold once did. Euros, dollars or dinars are therefore subject to the same conditions of immediate exchange and, between identical units, of equality.
The same currency: strictly equal amounts
Changing a 100-euro note for change requires receiving exactly 100 euros. Keeping 2 euros on the exchange would be riba al-fadl; any fee must pay for a distinct service that is clearly separated from the exchange itself.
Two different currencies: the rate is free
Between euros and dirhams, the parties set the rate freely, including a margin built into the dealer's quote. Only the requirement of immediate delivery remains: a difference in price is allowed, a difference in timing is not.
A worked example of a Sarf contract between two currencies
Under a Sarf contract, a traveller converts 1,000 euros into dirhams at a rate agreed with the dealer, say 4.00. The dealer hands over 4,000 dirhams in cash while the traveller hands over 1,000 euros at the same moment, and the parties part once both sides are settled. If the dealer promises to deliver the dirhams tomorrow, the Sarf contract is flawed, even if the rate is the market rate, because delivery was not simultaneous.
Now suppose the dealer's quote includes a margin, buying euros at 3.95 and selling at 4.05. The margin is the dealer's profit and is acceptable, because the rate between different currencies is not regulated by the Sarf rules; only the timing of delivery is. The traveller should simply compare quotes and choose the dealer whose margin is narrowest.
Taking possession before the parties separate
The heart of the contract is taqabud: each side receives its counter-value before the parties leave each other. If one of them departs without delivering, the exchange is void for the undelivered part, according to the doctrine adopted by AAOIFI.
Physical and constructive possession
Delivery can be physical, notes for notes, or constructive: a credit to the client's account, the handover of a certified cheque or an irrevocable electronic confirmation. The AAOIFI standard accepts these forms when they give each party effective control over the funds.
Market settlement periods and the T+2 debate
On the interbank market, a spot transaction usually settles two business days later. Some scholars and AAOIFI accept this delay as an unavoidable technical practice, others dispute it, and banks' Sharia boards decide case by case.
Paying for a foreign-currency purchase by card
When a traveller pays in dollars with a card debited in euros, the conversion happens during bank processing rather than at the counter. Many boards tolerate this mechanism, with the bank acting as agent, but the analysis varies with the card agreement.
Money transfers and exchange offices under the Sarf contract
International remittance combines a Sarf contract with an agency. The customer pays euros to the sending agent and the recipient takes local currency abroad. Jurists generally accept the arrangement when the agent has taken possession of the funds, when the exchange is concluded at a known rate, and when the fee is a fixed charge for the transfer service rather than something that varies with delay.
Exchange offices that apply the Sarf contract should therefore give a receipt showing the rate and the currencies. For transfers, a recipient who receives funds into an account is treated as having taken constructive possession at the time of credit. Customers sending money to family can ask whether the provider converts at the moment of transfer or applies a rate later, as the former is easier to reconcile with Islamic currency exchange rules.
What Sarf expressly prohibits
A conventional forward contract, which fixes a rate today for an exchange in three months, is excluded. So are currency futures and options, selling currency not yet received and swapping two debts in different currencies without immediate settlement.
A unilateral promise as a hedging substitute
To protect an importer against a rise in the dollar, some banks use a wa'd: only one party promises to buy or sell at a given rate on a future date. AAOIFI standards reject binding bilateral promises, which they treat as a forward contract.
Gold jewellery: cash purchases and trading in old gold
Buying gold jewellery for cash falls under Sarf: the price must be paid in full when the item is handed over, with no instalments. To exchange an old piece for a new one, the old item is sold first and the new one then bought.
Gold and metal accounts at Islamic banks
Some Islamic banks let clients buy allocated gold, identified and stored in the client's name, which meets the possession requirement. Unallocated gold accounts, where the client only holds a claim on the bank, are generally considered incompatible with Sarf.
Multi-currency accounts and trade payments
A multi-currency account at an Islamic bank lets the holder keep euros, dollars and pounds in the same account. Converting between pockets is a spot exchange and a form of Islamic currency exchange, completed at once, so it fits the Sarf contract. What the holder must avoid is an instruction to convert on a future date at a fixed rate, which resembles a forward and is generally excluded.
Importers face a similar choice in currency exchange in Islamic finance. Paying a foreign supplier in the supplier's currency can be done by buying the currency on the spot and remitting it immediately. If the payment date is far off, the importer may ask the bank for a Wa'd-based arrangement, or simply buy the currency when it is due, accepting the exchange-rate risk as a cost of doing business.
Common mistakes in Islamic currency exchange
The most frequent error is treating a delayed credit as if it were cash. A customer who pays cash for foreign currency but receives it in an account three days later has concluded a Sarf contract with deferred delivery on one side, which most boards would not accept except where the delay is an unavoidable technical lag. The remedy is simple: arrange the exchange so that both sides are credited within the same session.
A second mistake is buying currency on credit, for instance with a card cash advance carrying interest, to profit from an expected rate move. Besides the interest, the purchase is speculative and breaches the requirement of immediate delivery of the counter-value. A third is exchanging old banknotes for new ones with a premium, which adds an unequal amount to the same currency and falls under riba al-fadl.
Fees, commissions and records in currency exchange
A fee for the service of exchanging is acceptable if it is clearly separate from the rate and if it is not linked to the delay of settlement. A bank that charges a commission of a fixed amount per transaction is on safe ground, whereas a fee that varies with the time between payment and receipt would suggest a charge for credit.
Records matter for every Sarf contract. Keep the receipt, noting the date, the rate and the currencies, because it proves that the Sarf contract was concluded on the spot. Businesses that exchange regularly should reconcile statements with confirmations so that any settlement difference is spotted and corrected at once, and the accounting department can show a Sharia board that the exchanges were completed in the same session.