Banks hold reserves primarily to meet withdrawal demands and regulatory requirements, but funds held above those thresholds, known as excess reserves, can also be deployed in ways that generate income or support liquidity management.
In Kenya, commercial banks are required by the Central Bank of Kenya to maintain a Cash Reserve Ratio (CRR) of 3.25% of their total deposit liabilities in a non-interest-bearing account at the regulator. The rule applies to both domestic and foreign currency deposits. The ratio was lowered from 4.25% in February 2025, a policy adjustment intended to inject additional liquidity into the banking system and create more room for lending.
As of January 2026, the banking sector remained well supplied with cash. Data from the central bank showed commercial lenders were holding average excess reserves of about KSh13.8 billion above the required level, providing additional capacity for credit creation and financial market activity.
While required reserves must remain at the central bank, excess reserves can be allocated across several financial activities that help banks generate returns and manage liquidity.
- Lending to Households and Businesses
The most common use of excess bank reserves is extending credit. Banks convert surplus reserves into loans for households and companies, including mortgages, vehicle financing, personal loans, overdrafts, and working capital facilities for businesses. These loans generate interest income, which forms one of the largest sources of revenue for commercial banks.
From a balance sheet perspective, lending allows banks to transform idle liquidity into earning assets. When a bank issues a loan, the borrower typically deposits the funds into an account, which then circulates through the banking system as the money is spent on goods, services, or investments. This process increases economic activity while enabling banks to earn interest margins between the cost of funds and lending rates.
- Investing in Government Securities
When credit demand is weak or economic conditions make lending riskier, banks often deploy excess reserves into government securities. Treasury bills and Treasury bonds issued by governments provide predictable returns and are widely viewed as low-risk assets because they are backed by the state. These instruments also have active secondary markets, allowing banks to sell them quickly if they need to raise cash.
For banks, government securities serve as a way to earn returns while maintaining relatively high liquidity. In many banking systems, these investments form a large portion of balance sheets because they provide a steady stream of interest income without the credit risk associated with private-sector lending.
- Meeting Cash Withdrawal Demand
Banks also convert digital reserves held at the central bank into physical currency to meet customer withdrawal requests. This process increases the amount of vault cash, which refers to the banknotes and coins stored within a bank branch or cash vault. Vault cash forms part of a bank’s overall reserve holdings alongside its central bank balance.
Demand for physical currency tends to fluctuate during salary periods, public holidays, and festive seasons when households withdraw cash for spending. Banks must anticipate these fluctuations and maintain adequate vault cash to ensure customers can access their funds without disruptions.
- Lending to Other Banks
Excess reserves also circulate within the financial system through the interbank lending market. Banks that temporarily hold more reserves than required often lend those funds to other banks facing short-term liquidity shortages. These transactions are typically overnight or short-term loans used to ensure institutions meet daily reserve requirements or payment obligations.
Interbank lending plays an important role in maintaining stability in the banking system. It allows liquidity to move efficiently between institutions, ensuring that temporary imbalances in cash positions do not disrupt payments or financial transactions.
- Securitization and Liquidity Recycling
Banks may also convert existing loans into securities that can be sold to investors, a process known as securitization. In this arrangement, banks bundle groups of loans such as mortgages, auto loans, or consumer credit into financial instruments that investors can purchase. Once sold, the bank receives cash in return, effectively converting less-liquid loan assets back into reserves or other liquid funds.
This mechanism allows banks to recycle capital and liquidity. By selling loan-backed securities, banks free up balance-sheet capacity to issue new loans while still maintaining adequate reserve levels to meet regulatory requirements.
Reserve Rules and Liquidity Conditions
Kenyan banks must maintain the 3.25% CRR on average over a monthly cycle running from the 15th of one month to the 14th of the next, though reserves cannot fall below 2% on any single day.
The reserve rule operates separately from capital regulations. The Central Bank of Kenya has also directed lenders to maintain minimum core capital of KSh5 billion by December 2026, with a further increase to KSh10 billion by 2029.
Jefferson Wachira is a writer at Africa Digest News, specializing in banking and finance trends, and their impact on African economies.