How Exchange Rates Affect Your Currency Transfer

Exchange rates sit at the centre of every currency transfer. Even a small difference in the rate applied can change the amount that arrives at the other end of a transaction, which is why understanding how rates are determined is useful before sending money abroad.

What an exchange rate represents

An exchange rate expresses the value of one currency in terms of another. For example, a rate between the South African rand and the US dollar tells you how many rand are needed to buy one dollar, or conversely how many dollars a given amount of rand will buy. These rates are not fixed; they move continuously during trading hours as currencies are bought and sold on global markets.

The interbank rate versus the retail rate

The rate quoted on financial news sites or currency converter tools is usually the interbank rate, which is the rate at which large financial institutions trade currency with each other in bulk. Individual consumers and businesses rarely receive this exact rate. Banks and foreign exchange providers typically add a margin on top of the interbank rate, and this margin is one of the main ways they generate revenue from a transfer. When comparing providers, it is worth asking what rate they will actually apply to your transaction, rather than only looking at the headline interbank figure.

What causes exchange rates to move

Several factors influence currency values on an ongoing basis:

Interest rate decisions: Central bank announcements, including those from the South African Reserve Bank and major foreign central banks, can shift currency values quickly.
Economic data: Figures such as inflation, employment and trade balances affect how investors view a currency's strength.
Political developments: Elections, policy changes and geopolitical events can introduce volatility.
Commodity prices: Because South Africa is a significant exporter of commodities, the rand can be sensitive to shifts in global commodity markets.
Global market sentiment: Broader risk appetite among international investors often affects emerging market currencies, including the rand, as a group.

Because of these combined influences, exchange rates can move noticeably within a single day, which is why timing can matter for larger transfers.

Fixed rates versus live rates

Some providers allow customers to lock in a rate for a short period before completing a transfer, while others apply the live market rate at the moment the transaction is processed. A locked rate offers certainty about the amount involved, while a live rate means the final amount depends on market movement between the time the transfer is requested and the time it is executed. Neither approach is inherently better; the right choice depends on how much certainty you need and how comfortable you are with short term rate fluctuations.

Forward contracts and advance planning

For larger or recurring transfers, some providers offer the ability to agree on an exchange rate in advance for a transaction that will settle at a future date. This can be useful for businesses managing foreign currency obligations or individuals planning a known future payment, such as a property purchase, since it removes uncertainty about how the rate might move before the payment is due. These arrangements typically involve their own terms and conditions, which should be reviewed carefully.

Practical steps before transferring

Before sending a significant amount, it can help to check the current interbank rate as a reference point, compare the rate and fees quoted by more than one provider, and understand whether the quoted rate is guaranteed or subject to change before the transfer is finalised. Taking these steps does not guarantee the best possible outcome, since rates move unpredictably, but it does provide a clearer picture of what a transfer will actually cost and what the recipient can expect to receive.