Stress Tests for Banks
SUPERVISORY CIRCULAR NO. 6 LIQUIDITY RISK MANAGEMENT
NATIONAL BANK OF THE REPUBLIC OF MACEDONIA
June 2004 ---
http://www.nbrm.gov.mk/WBStorage/Files/SUP_Circular-likvidnost0.pdf
Stress-testing
The bank should perform stress testing in various circumstances - stress scenarios, in order to
identify their influence on the bank's liquidity position, as well as on the possibility to observe
the set limits. The stress scenarios are especially important in determining and comprehending
the liquidity risk level that exists in the bank, but for the purpose of meeting this objective, they
should be realistic, i.e. compatible with the condition not only in the bank, but on the market as
well. Hence, these scenarios should take into consideration the internal (specific for the bank)
and external (market) factors.
Stress scenario means significant negative change of different internal and external factors
which have an appropriate influence on the bank's liquidity. In addition, simultaneous changes
to several factors are made (for example, changes in the level of the sight deposits, highly
liquid securities, the level or the quality of the credit exposure, the exchange rate, interest
rates), reflecting the situation the bank's managing bodies find possible in the future. The
stress scenario can be based on certain significant event which happened in the past (historic
scenario - for example, the Kosovo crisis), or on a certain event for which there is no
example in the past (hypothetical scenario). Accordingly, those presumptions the change of
which will have the largest influence on the final stress-test results should be selected as a
base of the testing. Also, the stress-tests and the presumptions have to be adjusted to the
characteristics of the current financial situation periodically (at least once a year) and renewed
in order to encompass the new sources of risk as well. It means that the stress-testing should
correspond to the characteristics of the bank itself, its risk profile, the manner of risk
management, etc.
In order to accomplish an efficient stress-testing, the envisaged changes and movements in
the scenario should be sufficiently big and shocking. The small changes are not relevant for
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the stress-testing, because those changes can be well covered by the other traditional models
for liquidity monitoring.
Regarding the liabilities, the stress scenarios can be useful for determining the core deposit
base. Namely, if the basic elements for successful stress-testing are followed accurately, the
following four questions can be answered:
·
Which sources of funds will most probably remain in the bank, regardless the banks'operation? The most stable sources of funds, such as the saving deposits of the depositors,
which follow the established deposit insurance scheme in the country, should be identified;
·
Which sources of funds are expected to decrease gradually in case of problems, and atwhich rate? This group should include the deposits and those interbank borrowings, for
which there is a relatively high possibility to remain in the bank even in case of significant
problems, and for which the analyses indicate that will decrease gradually during a crisis;
·
Which sources of funds with or without contractual maturity are expected to "run" fromthe bank when the first signs of operating problems become evident? In most of the
cases, these are liabilities with possibility of early withdrawal, deposits without maturity
which will most probably be transformed into safer investments (Government bonds,
etc.), as well as deposits of large legal entities which have an access to a larger number
of information on the market and banking system developments.
·
Does the bank have alternative sources of liquid assets which it can rely on in eliminatingthe liquidity problems? Such assets include the unused back-up lines concluded with other
entity, which the bank can use as an additional source of funds, as well as the credits of
the central bank.
The main presumption of the stress-test on the assets side could be either the incapability of
the bank to provide a single additional external source of financing, or its incapability to collect
its claims. In this case, the only way of financing the needs of the bank is the sale of a part of
the assets items, i.e. the scenario enables to identify for how long the bank will be able to
continue repaying its short-term liabilities by selling the available funds. The above will help
the bank to determine the real marketability of its assets.
The stress-tests create a clearer picture of the risk profile of the bank from the aspect of the
liquidity risk. This is especially important for the Board of Directors and the Risk
Management Board which should revise the stress-tests results on a regular basis. The
stress-tests represent a solid basis for determining the liquidity risk and planning in case of
crisis.