HOW BANKING WORKS · MARKET AND RATE RISK 50
A bank can be balanced in Singapore dollars and exposed in US dollars at the same time
Foreign-exchange risk enters a bank whenever claims in different currencies do not move together. A bank can lend US dollars, take Singapore-dollar deposits, issue euro debt, receive yen fees, hedge with swaps and own a subsidiary whose capital is measured in another currency.
If those positions do not offset, a change in exchange rates alters earnings, capital, liquidity or economic value.
This article continues Batch 13 under How Banking Works. The current Basel market-risk architecture sits in the Basel Framework’s market-risk standard.
The simplest FX position is an unmatched asset and liability
Suppose a bank makes a US$100 million loan but funds it with Singapore-dollar liabilities. The bank owns a dollar asset and owes Singapore dollars.
If the US dollar weakens against the Singapore dollar, the Singapore-dollar value of the loan falls while the funding obligation does not necessarily fall with it.
foreign-currency asset + different-currency funding = open currency exposure unless hedged.
Foreign-currency deposits can create the opposite mismatch
A customer can deposit US dollars with a Singapore bank. The deposit is a US-dollar liability to the bank. If the bank holds mostly Singapore-dollar assets, it now needs a credible way to meet that dollar claim.
The bank can hold dollar assets, borrow dollars, use swaps or maintain other hedges. The currency of the liability matters independently of the bank’s total liquidity.
This is why a bank can be liquid overall and still face a shortage in one currency.
Customer FX transactions transfer risk into the bank temporarily
A corporate customer may sell US dollars and buy Singapore dollars. The bank stands on the other side of the transaction until it offsets or hedges the position elsewhere.
If the bank immediately executes an offsetting market transaction, residual FX risk can be small. If it keeps part of the position, deliberately or accidentally, market movement changes profit and loss.
The customer sees conversion. Treasury sees inventory, limits and open exposure.
A bank’s trading desk can hold intentional FX risk
Market-making desks quote prices to customers and can hold temporary currency positions. Trading books can also contain authorised directional or relative-value positions within risk limits.
Those positions are subject to market-risk measurement, limits and capital requirements under the applicable framework.
The bank therefore distinguishes between FX exposure created to serve customers and FX exposure deliberately retained as market risk.
Foreign-currency lending creates credit risk and FX risk together
A borrower earning Singapore dollars can borrow US dollars. Even if the bank hedges its own currency exposure perfectly, the borrower can become weaker if the dollar appreciates and repayment becomes more expensive in Singapore-dollar terms.
The bank’s direct FX risk can therefore be hedged while indirect credit risk rises.
currency mismatch at the borrower → higher debt-service burden → higher default risk at the bank.
Foreign-exchange risk should therefore be rotated through both the bank and the borrower.
Cross-border funding introduces refinancing risk in a specific currency
A bank can fund dollar loans with short-term dollar borrowing from international markets. The currency matches, so direct FX mismatch is reduced.
But if that dollar funding must be rolled frequently, the bank now depends on continued access to dollar markets. A global funding shock can make the currency expensive or unavailable.
Read Rollover Risk and How Interbank Borrowing Works.
FX swaps can convert one currency of funding into another
A bank with Singapore-dollar funding can use an FX swap to obtain US dollars for a period while agreeing to reverse the exchange later. Economically, the bank has transformed funding across currencies.
This can be efficient. It also creates counterparty, collateral, rollover and basis risk. If swap markets become stressed, the cost of transforming currencies can rise sharply.
Currency matching therefore can depend on market infrastructure rather than only on the original deposit base.
Cross-currency basis is a funding price, not merely an FX quote
When demand to borrow one currency through swaps is unusually strong, the price of converting funding can move away from simple interest-rate differences. This cross-currency basis can change the real cost of foreign-currency funding.
A bank can therefore hedge the spot exchange rate and still face a changing funding spread between currencies.
Article 52 will show the general basis-risk principle.
Derivatives reduce FX risk by creating offsetting positions
- spot transactions change currency holdings now;
- forwards lock an exchange rate for a future date;
- FX swaps exchange currencies now and reverse later;
- options create asymmetric protection against adverse moves;
- cross-currency swaps can exchange principal and interest cash flows across currencies over longer periods.
Hedging changes the distribution of risk. It does not remove the need to manage counterparty exposure, collateral, liquidity and model assumptions.
A worked miniature
A bank owns a US$50 million loan and has no dollar liability or hedge. At an exchange rate of S$1.35 per US dollar, the asset is worth S$67.5 million in Singapore-dollar terms.
If the dollar falls to S$1.25, the same US$50 million claim is worth S$62.5 million before considering interest or credit changes.
The bank has lost S$5 million of Singapore-dollar value from the currency move alone.
If it had a matching US$50 million liability, much of that translation movement would be offset because both sides would revalue together.
Net open position is more informative than gross currency turnover
A bank can transact billions of dollars of FX every day while ending with a small net position because purchases and sales offset.
Conversely, a relatively small business can create meaningful risk if it leaves a large unhedged position relative to capital.
Volume tells the reader how much activity occurred. Net sensitivity tells the bank how much market movement can hurt.
Gross positions still matter because offsetting claims can fail differently
Suppose the bank has a US$100 million asset and a US$100 million derivative hedge. The net currency sensitivity can be small. But the asset borrower and derivative counterparty are different entities.
If one defaults or collateral calls arise, the apparently matched position can create credit or liquidity stress.
Netting market risk does not erase gross counterparty and funding mechanics.
Settlement risk appears because currencies can settle on different infrastructures and clocks
An FX transaction exchanges one currency for another. If the bank pays one side before it irrevocably receives the other, it can be exposed to principal loss if the counterparty fails in between.
Payment-versus-payment mechanisms and settlement controls reduce this risk, but cross-border timing and infrastructure still matter.
The deeper payment principle remains the same as in A Payment Instruction Is Not Yet Settlement: instruction and finality are not identical.
Foreign subsidiaries create structural FX exposure
A banking group can own a subsidiary whose assets, liabilities and capital are denominated in another currency. When group accounts are translated into the parent’s reporting currency, exchange-rate movements can change reported equity and capital measures.
This exposure is different from a short-term trading position. It can arise from owning an enduring foreign business.
Banks may hedge some structural exposure while deliberately leaving some unhedged to preserve the foreign subsidiary’s local capital position or for other strategic reasons subject to regulation and risk appetite.
Foreign earnings can move even when the local business does not
A foreign branch can earn the same amount in local currency as last year, yet the parent reports lower profit after translation because the local currency weakened.
This translation effect can change reported performance without changing the branch’s local operating result.
FX risk can enter through fees and expenses too
A bank can earn fee income in one currency and pay technology, staff or vendor expenses in another. Even without large loans or trading positions, currency changes can alter margins.
Risk management therefore includes forecast cash flows as well as existing balance-sheet claims.
FX limits translate risk appetite into operating boundaries
Banks can set limits by currency, desk, legal entity, tenor and stress loss. Market-risk systems monitor whether open positions remain within authorised boundaries.
The purpose is to prevent routine customer flow from quietly becoming a large speculative exposure.
Stress testing should combine currency moves with liquidity and credit effects
A severe currency move can trigger derivative margin calls, weaken borrowers with foreign-currency debt, change collateral values and make cross-currency funding expensive.
The bank should therefore test more than the mark-to-market loss on the open FX position.
Read Bank Stress Tests.
Four misconceptions to remove
| Misconception | Better model |
|---|---|
| “A bank has FX risk only when it trades currencies.” | Loans, deposits, funding, fees, derivatives and foreign subsidiaries can all create currency exposure. |
| “Matching the currency removes all risk.” | It reduces direct FX mismatch but can leave rollover, basis, counterparty and liquidity risk. |
| “If the bank hedges, the borrower’s FX exposure no longer matters.” | A borrower with foreign-currency debt can become less creditworthy when exchange rates move. |
| “Net exposure is the only number that matters.” | Gross positions still create counterparty, settlement and collateral mechanics. |
A mastery test
- How can a foreign-currency loan create FX risk at the bank?
- Why can a bank hedge direct FX risk while borrower credit risk rises?
- How do FX swaps transform funding across currencies?
- Why does settlement risk remain after a trade is agreed?
- How can a foreign subsidiary create structural FX exposure?
If those answers connect, foreign-exchange risk becomes visible as a mismatch of currencies across the same bank: the institution has not merely borrowed and lent money—it has borrowed and lent different units of account that move relative to one another.