Maturity Transformation
What is Maturity Transformation?
Maturity transformation is banks borrowing short-term (deposits) and lending long-term (loans), profiting from the rate spread while taking on liquidity and interest-rate risk.
Banks reconcile savers who want instant access with borrowers who want long-term funding, earning the spread between long-term loan rates and short-term deposit rates. This mismatch is the core of banking but creates liquidity risk: if many depositors withdraw at once, the bank cannot quickly recall long-term loans, a setup for a bank run. It also exposes banks to interest-rate risk when short rates rise.
Maturity Transformation: a worked example
Harbor Savings takes $50 million of deposits that savers can withdraw any day, paying 2%, and lends $45 million as 20-year fixed mortgages at 6%. Interest earned is 0.06 x $45 million = $2.7 million; interest paid is 0.02 x $50 million = $1 million; the spread is $1.7 million a year. Short rates then jump and depositors demand 5%. Deposit costs become $2.5 million while mortgage income is still $2.7 million, so the spread collapses to $200,000. The mortgages cannot be repriced for 20 years, which is the interest rate risk maturity transformation carries by construction.
The mistake students make with maturity transformation
The wrong belief is that a bank which cannot meet withdrawals must have lent badly. Illiquidity and insolvency are different conditions: a bank whose loans are all performing can still fail if depositors ask for cash faster than 20-year mortgages return it. The confusion is easy because both end with a closed bank and a queue outside. The distinction drives policy, since an illiquid but solvent bank is the case a central bank lends into, while an insolvent one is resolved.
Maturity Transformation questions
Why do banks borrow short and lend long?
Banks borrow short and lend long because savers want instant access while borrowers want funding for decades, and long-term rates normally sit above short-term rates. The gap between the two is where a bank's interest income comes from. A bank paying 2% on deposits and earning 6% on mortgages keeps 4 percentage points before operating costs and loan losses. Serving both preferences at once is the service that spread pays for.
What risks does maturity transformation create?
Maturity transformation creates liquidity risk and interest rate risk. Liquidity risk is the timing mismatch: deposits can leave today, but a 20-year mortgage cannot be called in today, so a wave of withdrawals forces asset sales at whatever price a panicked market offers. Interest rate risk is the pricing mismatch: deposit costs reset quickly when short rates rise while fixed loan income stays put.
Is maturity transformation the same thing as a bank run?
Maturity transformation is the condition that makes a bank run possible, not the run itself. The run is the event, depositors withdrawing at once; the transformation is the permanent structure of borrowing short and lending long that leaves the bank unable to satisfy them all quickly. Deposit insurance and central bank liquidity facilities exist to stop the structure from turning into the event.
Related terms
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