science

Exposure at default

Exposure at default is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Exposure at default rather than just read about it. In short: Exposure at default (EAD) is a parameter used in the calculation of economic capital or regulatory capital under Basel II for a banking institution. It can be defined as the gross exposure under a facility upon default of an obligor.

Key takeaways

Exposure at default belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Exposure at default to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Exposure at default from memory before moving on to harder problems.

Reference excerpt

Exposure at default (EAD) is a parameter used in the calculation of economic capital or regulatory capital under Basel II for a banking institution. It can be defined as the gross exposure under a facility upon default of an obligor.

Outside of Basel II, the concept is sometimes known as credit exposure (CE). It represents the immediate loss that the lender would suffer if the borrower (counterparty) fully defaults on its debt. The EAD is closely linked to the expected loss, which is defined as the product of the EAD, the probability of default (PD) and the loss given default (LGD).

Definition In general, EAD is seen as an estimation of the extent to which a bank may be exposed to a counterparty in the event of, and at the time of, that counterparty’s default. EAD is equal to the current amount outstanding in case of fixed exposures such as term loans. For revolving exposures like lines of credit, EAD can be divided into drawn and undrawn commitments; typically the drawn commitment is known whereas the undrawn commitment needs to be estimated to arrive at a value of EAD. Based on Basel Guidelines, EAD for commitments measures the amount of the facility that is likely to be drawn further if a default occurs. Two popular terms used to express the percentage of the undrawn commitment that will be drawn and outstanding at default (in case of a default) are Conversion Factor (CF) and Loan Equivalent (LEQ).

Calculation Calculation of EAD is different under foundation and advanced approach. While under foundation approach (F-IRB) calculation of EAD is guided by the regulators, under the advanced approach (A-IRB) banks enjoy greater flexibility on how they calculate EAD.

Foundation approach Under F-IRB, EAD is calculated taking account of the underlying asset, forward valuation, facility type and commitment details. This value does not take account of guarantees, collateral or security (i.e. ignores Credit Risk Mitigation Techniques with the exception of on-balance sheet netting where the effect of netting is included in Exposure At Default). For on-balance sheet transactions, EAD is identical to the nominal amount of exposure. On-balance sheet netting of loans and deposits of a bank to a corporate counterparty is permitted to reduce the estimate of EAD under certain conditions. For off-balance sheet items, there are two broad types which the IRB approach needs to address: transactions with uncertain future drawdown, such as commitments and revolving credits, and OTC foreign exchange, interest rate and equity derivative contracts.

Advanced approach Under A-IRB, the bank itself determines how the appropriate EAD is to be applied to each exposure. A bank using internal EAD estimates for capital purposes might be able to differentiate EAD values on the basis of a wider set of transaction characteristics (e.g. product type) as well as borrower characteristics. These values would be expected to represent a conservative view of long-run averages, although banks would be free to use more conservative estimates. A bank wishing to use its own estimates of EAD will need to demonstrate to its supervisor that it can meet additional minimum requirements pertinent to the integrity and reliability of these estimates. All estimates of EAD should be calculated net of any specific provisions a bank may have raised against an exposure.

Importance For a risk weight derived from the IRB framework to be transformed into a risk weighted asset, it needs to be attached to an exposure amount. Any error in EAD calculation will directly affect the risk weighted asset and thereby affect the capital requirement.

References

External links Basel II: Revised international capital framework, BCBS Basel II: International Convergence of Capital Measurement and Capital Standards: a Revised Framework, BCBS Basel II: International Convergence of Capital Measurement and Capital Standards: a Revised Framework, November 2005 Revision Basel II: International Convergence of Capital Measurement and Capital Standards: a Revised Framework, Comprehensive Version, June 2006 Revision

Worked examples

Example 1 — a first encounter with Exposure at default

Start with the simplest possible case. Write down what Exposure at default claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Exposure at default before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Exposure at default ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Exposure at default

In research: Exposure at default appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Exposure at default in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Exposure at default is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bank regulation, Banking terms, Credit risk, so understanding it makes those chapters shorter.
In everyday life: Look for Exposure at default outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Exposure at default in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Exposure at default means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Exposure at default out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Exposure at default in simple terms?

Why does Exposure at default matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Exposure at default?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Exposure at default.