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FRM Exam Part I · Exchanges and OTC Markets

Bilateral Clearing, Netting and CSA Collateral Explained

Updated 11 October 2026 · Fact-checked

Bilateral clearing means two OTC derivative counterparties manage credit risk directly under an ISDA master agreement. Close-out netting combines all trades into one net amount on default. A CSA adds collateral: the party with a net exposure above thresholds receives margin. To solve questions, net first, then apply threshold and minimum transfer amount.

Understand Bilateral Clearing, Netting, and Collateral (CSA)

In the OTC market, two parties trade directly. Each takes on the other's credit risk. This is bilateral clearing: no central counterparty (CCP) sits in the middle. The risk is managed by contract terms, not by a clearinghouse.

The contract framework is the ISDA Master Agreement. It sets common legal terms for all trades between two parties. Each trade is a confirmation under that master. The key feature is close-out netting. If one party defaults, all trades are terminated and their values are added together into a single net amount. Only that net amount is owed. Without netting, a liquidator could demand payment on trades where the defaulter is owed money (cherry-picking) while paying little on trades where the defaulter owes. Netting only works if it is legally enforceable in the relevant jurisdiction.

The Credit Support Annex (CSA) is part of the ISDA documentation that governs collateral. Exposure is measured as the net mark-to-market value of the portfolio. If it is positive for you, the counterparty is the one that posts collateral. Key terms are the threshold (exposure you accept uncollateralised), the minimum transfer amount (MTA) (smallest call that is made), independent amount (extra upfront collateral, like initial margin), the margin call frequency (often daily), and eligible collateral (cash, government bonds, with haircuts on non-cash assets).

Collateral reduces but does not remove risk. There is still a margin period of risk: the time between the last collateral exchange and the close-out of positions after a default. Prices can move in that window. Disputes over valuation, collateral quality and wrong-way risk also remain. Collateral may be rehypothecated (reused by the receiver) under some arrangements, which raises efficiency but exposes the poster to the receiver's credit risk if the collateral is not returned. Post-crisis rules also require initial margin for many non-centrally-cleared derivatives.

Compared with central clearing, bilateral clearing is flexible and allows customised trades. But it is opaque, creates a web of exposures, and offers netting only within each pair of counterparties. A CCP nets across all members, which usually gives more netting benefit.

Key formulas to remember

Net exposure with close-out netting
Net exposure = max(Σ Vi, 0)
Sum the values of all trades in the netting set from your viewpoint, then floor at zero. Without netting: Σ max(Vi, 0).
Netting benefit
Benefit = Σ max(Vi, 0) − max(Σ Vi, 0)
Always ≥ 0. It is zero when all trades have positive value or all are negative or zero.
Collateral call (CSA)
Required collateral = max(Net exposure − Threshold, 0) + Independent amount
Compare with collateral already held. Make a transfer only if the difference is at least the MTA. Conventions on independent amounts vary, so follow the stem.
Uncollateralised exposure after a call
Residual exposure ≈ Net exposure − Collateral held × (1 − haircut)
Non-cash collateral is valued after haircut. Add exposure change over the margin period of risk.

How to solve Bilateral Clearing, Netting, and Collateral (CSA) questions

Use this order for any numerical or conceptual question on netting and CSAs.

  1. 1Identify whether trades fall under one ISDA master and whether netting is legally enforceable. If not, treat trades separately.
  2. 2Take every trade value from the same party's viewpoint. Positive means the counterparty owes you.
  3. 3Compute the gross exposure Σ max(Vi, 0) and the net exposure max(Σ Vi, 0).
  4. 4If a CSA applies, subtract the threshold from net exposure and floor at zero. Add any independent amount if the stem says so.
  5. 5Adjust collateral held for haircuts, then find the shortfall or excess.
  6. 6Apply the MTA: transfer only if the required move is at least the MTA. Note any rounding rule.
  7. 7For conceptual parts, name the remaining risk: margin period of risk, valuation disputes, rehypothecation or wrong-way risk.

Quickest way: Net, subtract threshold, check MTA

When to use it: Use this on numerical MCQs where trade values and CSA terms are given.

  1. Add all signed trade values to get the net value. Floor at zero.
  2. Subtract threshold and floor at zero. That is the required collateral.
  3. Subtract collateral already held (after haircut).
  4. If the absolute difference is below MTA, answer zero transfer.
  5. For conceptual options, eliminate any that claim collateral or netting removes all risk.

Common mistakes in Bilateral Clearing, Netting, and Collateral (CSA)

  • Adding only positive trade values when netting applies

    Students confuse gross exposure with net exposure.

    Fix: With enforceable close-out netting, sum all values including negatives, then floor the total at zero.

  • Applying the threshold before netting

    The CSA terms look like they apply trade by trade.

    Fix: Collateral is computed on the net exposure of the whole netting set. Net first, then subtract the threshold.

  • Ignoring the MTA

    The call amount is calculated and then simply paid.

    Fix: Compare the required movement with the MTA. If it is smaller, no transfer happens.

  • Saying collateral eliminates counterparty risk

    Collateral feels like a full guarantee.

    Fix: Remember the margin period of risk, haircuts, thresholds, valuation disputes and collateral reuse risk.

  • Treating netting as automatic everywhere

    Students forget it rests on law.

    Fix: Netting depends on legal enforceability in the counterparty's jurisdiction. Without it, exposure is gross.

  • Mixing up the direction of margin

    Signs of trade values depend on the viewpoint.

    Fix: Define the viewpoint first. The party that is out of the money posts to the party that is in the money.

Worked examples

Example 1

Bank A has three trades with Counterparty B under one ISDA master with enforceable close-out netting. Values to A: +$12 million, −$7 million, +$3 million. What are the gross exposure, net exposure and netting benefit?

Show the solution
  1. Gross exposure = max(12,0) + max(−7,0) + max(3,0) = 12 + 0 + 3 = $15 million.
  2. Sum of values = 12 − 7 + 3 = $8 million.
  3. Net exposure = max(8, 0) = $8 million.
  4. Netting benefit = 15 − 8 = $7 million.

Answer: Gross exposure $15 million, net exposure $8 million, netting benefit $7 million.

Example 2

Under a CSA, Bank A's portfolio with B has a net mark-to-market of +$20 million to A. B's threshold is $5 million, the MTA is $0.5 million, there is no independent amount, and A already holds $14.8 million of cash collateral from B. How much more collateral must B post?

Show the solution
  1. Required collateral = max(20 − 5, 0) = $15 million.
  2. Collateral already held = $14.8 million.
  3. Shortfall = 15 − 14.8 = $0.2 million.
  4. The shortfall of $0.2 million is below the MTA of $0.5 million, so no call is made.

Answer: B posts nothing more. The shortfall of $0.2 million is below the $0.5 million MTA.

Exam tips

  • Questions often give trades with mixed signs. Always compute both gross and net exposure before reading the options.
  • Know the CSA vocabulary cold: threshold, MTA, independent amount, haircut, margin period of risk, rehypothecation.
  • For bilateral versus central clearing, remember that a CCP nets across all members and a bilateral netting set covers only one pair.
  • Watch for a stem that says netting is not enforceable. Then exposure is gross.
  • Conceptual options with words like 'eliminates' or 'removes all' risk are usually wrong.

Practice questions from Exchanges and OTC Markets

Bilateral Clearing, Netting, and Collateral (CSA) in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Bilateral Clearing, Netting, and Collateral (CSA): frequently asked questions

What does the ISDA Master Agreement do?

It sets standard legal terms for OTC derivatives between two parties. It defines events of default and provides for close-out netting, so all trades collapse into one net amount if one party defaults.

What is a Credit Support Annex (CSA)?

It is the part of the ISDA documentation that governs collateral. It sets the threshold, minimum transfer amount, eligible collateral, haircuts and call frequency. Collateral moves to cover the net exposure above the threshold.

How does close-out netting reduce exposure?

It replaces many gross claims with one net claim. The surviving party cannot be forced to pay on trades where it owes money while only receiving a fraction on trades where it is owed. Exposure falls from Σ max(Vi, 0) to max(Σ Vi, 0).

What is the difference between bilateral and central clearing?

In bilateral clearing, each pair of counterparties manages credit risk by contract and collateral. In central clearing, a CCP becomes the counterparty to both sides, nets across members, and uses standardised margin and a default fund.

What is rehypothecation of collateral?

It is the reuse by the collateral receiver of posted collateral for its own purposes. It improves collateral efficiency, but the poster may become an unsecured creditor of the receiver if the collateral cannot be returned.