CFA Level I Exam · Derivative Instrument and Derivative Market Features

Central Clearing and Margin Mechanics in Futures

Q: What is the role of a clearinghouse in derivatives?

The clearinghouse becomes the counterparty to both sides of every trade, which is called novation. It guarantees performance, sets and collects margin, and settles gains and losses daily. This removes the risk that one trader defaults on another.

Q: What is the difference between initial, maintenance and variation margin?

Initial margin is the deposit made when you open a position. Maintenance margin is the lower minimum balance you must keep. Variation margin is the deposit you make after a margin call; under the CFA curriculum convention it brings the balance back up to initial margin, though exchange practice can differ.

Q: How does marking to market work in futures?

At the end of each day the contract is revalued at the settlement price. Gains are credited and losses are debited to the margin account. This resets the contract's value to zero and stops losses from building up unnoticed.

Q: Does central clearing remove all risk from a derivative?

No. It removes counterparty default risk to a large degree, but you still carry market risk, meaning the price of the underlying can move against you. Clearing members and the clearinghouse also rely on margin and default funds that have limits.

Updated 7 October 2026 · Fact-checked

Central clearing means a clearinghouse becomes the buyer to every seller and the seller to every buyer, removing bilateral counterparty risk. Each party posts initial margin, and gains and losses are settled daily through marking to market. Under the CFA convention, a margin call restores the account to initial margin when it falls below maintenance; exchange practice can differ.

Understand Central Clearing and Margin Mechanics

A derivative is a promise to pay or receive money in the future. The risk is that the other side does not pay. This is counterparty credit risk. In over-the-counter (OTC) markets, each party carries this risk against the other. Futures exchanges solve it with a clearinghouse.

The clearinghouse (central counterparty, or CCP) steps between buyer and seller. After a trade, the original contract is replaced by two contracts: one between the buyer and the clearinghouse, and one between the seller and the clearinghouse. This is called novation. Buyers and sellers no longer care who was on the other side. The clearinghouse guarantees performance and is the counterparty to all trades. It also lets traders close a position by taking an offsetting trade, without needing the original counterparty.

The clearinghouse protects itself with margin. Initial margin is the deposit you post when you open a futures position. It is a performance bond, not a down payment, and is set to cover a likely one-day loss. Maintenance margin is the minimum balance you must keep. It is lower than initial margin. Variation margin is the extra amount you deposit when a margin call arrives. Under the CFA curriculum convention, it brings the account back up to the initial margin level, not just to maintenance. Practice can differ by exchange, so follow the convention the question states.

The daily settlement is called marking to market. At each day's end, the futures contract is revalued at the settlement price. Gains are added to the margin account and losses are deducted. The futures contract is effectively reset to zero value each day. A long gains when the futures price rises. A short gains when it falls. If the balance drops below maintenance margin, the margin call is issued and must be met promptly, or the position is closed out.

Together, these features cut default risk. Losses are collected daily, so they never build up. Margin gives a buffer, and the clearinghouse's own resources (clearing member contributions, default funds) sit behind that. Forwards, by contrast, typically settle only at maturity, so exposure can build up over the contract's life. Many OTC derivatives are now also centrally cleared and margined, narrowing the difference.

Key formulas to remember

Daily gain or loss on a futures position: Long: (Settlement price today − Settlement price yesterday) × Contract size × Number of contracts. Short: the negative of this.; On the day of trade, use the trade price instead of yesterday's settlement price.
Margin account balance: Ending balance = Beginning balance + Gains − Losses + Deposits − Withdrawals; Do the arithmetic every day; a margin call depends on the ending balance.
Margin call trigger: Margin call if balance < Maintenance margin; Equal to maintenance is not below it. The call is only triggered below.
Variation margin required: Variation margin = Initial margin − Current balance; Under the CFA curriculum convention, the deposit restores the account to initial margin, not to maintenance margin. Exchange practice can differ.
Margin ordering: Maintenance margin < Initial margin; Initial margin is the higher figure; the gap is the cushion before a call.

How to solve Central Clearing and Margin Mechanics questions

Use this approach for any clearing or margin question, whether it is conceptual or numerical.

1Identify what is asked: a conceptual role of the clearinghouse, a definition of a margin type, or a margin account calculation.
2For conceptual items, match the feature to its risk-reduction purpose: novation and guarantee remove counterparty risk, margin covers potential loss, daily settlement stops losses building up.
3For calculations, note whether you are long or short. Longs gain when price rises; shorts gain when price falls.
4Compute the daily change: price change × contract size × number of contracts, with the correct sign for your position.
5Update the balance: previous balance plus gain or minus loss, then add any deposits already made.
6Compare the balance to maintenance margin. Only a balance strictly below it triggers a margin call.
7If a call is triggered, compute the deposit as initial margin minus the current balance, and set the new balance equal to initial margin.
8Check the answer against the three options. Eliminate any that use the maintenance level as the deposit target or flip the sign for a short.

Quickest way: Balance-versus-trigger shortcut

When to use it: Use for numerical margin call questions where you need the deposit or the price at which a call occurs.

Compute the cushion: initial margin minus maintenance margin, per contract.
Divide the cushion per contract by the contract size (units per price point) to get the price move that triggers a call: a fall for a long, a rise for a short. Both figures are per contract, so the number of contracts cancels out and you can ignore it here. Example: a $1,000 cushion and a size of 50 gives 1,000 ÷ 50 = 20 points.
Any move bigger than this means a call; compare it to the price move given.
If a call happens, the deposit equals initial margin minus the balance, which equals the amount the balance is below initial margin.
Scan the three options and discard any that are smaller than the loss already suffered.

Common mistakes in Central Clearing and Margin Mechanics

Calling initial margin a down payment on the contract.
Margin sounds like buying on credit, as in a share margin loan.
Fix: Remember that futures margin is a performance bond. No loan is made and no ownership is purchased.
Restoring the account only to maintenance margin after a call.
Students think the trigger level is also the target.
Fix: Variation margin brings the balance back up to initial margin.
Issuing a margin call when the balance exactly equals maintenance margin.
Careless reading of 'falls to' versus 'falls below'.
Fix: A call needs the balance strictly below maintenance margin.
Getting the sign wrong for a short position.
Students apply the long formula by habit.
Fix: Write long or short next to the problem first. A short gains when the settlement price falls.
Thinking the clearinghouse takes a view on price or removes all risk.
The guarantee is confused with market protection.
Fix: The clearinghouse removes counterparty default risk, not price risk. You still bear the market loss on your position.
Assuming forwards are marked to market daily like futures.
The two contracts are treated as identical.
Fix: Forwards usually settle at maturity with no daily settlement, so credit exposure can accumulate.

Worked examples

Example 1

An investor sells 5 futures contracts at 800 each, contract size 100 units. Initial margin is $6,000 per contract and maintenance margin is $4,500 per contract. The settlement price rises to 820 on day 1. What variation margin must the investor deposit?

A. $2,500

B. $10,000

C. $30,000

Show the solution

The investor is short, so a price rise is a loss.
Loss = (820 − 800) × 100 × 5 = $10,000.
Initial margin total = $6,000 × 5 = $30,000. Maintenance total = $4,500 × 5 = $22,500.
Ending balance = $30,000 − $10,000 = $20,000.
$20,000 is below $22,500, so a margin call is triggered.
Variation margin = initial margin − balance = $30,000 − $20,000 = $10,000.
Option A ($2,500) is only the shortfall below maintenance margin ($22,500 − $20,000), which would restore the account to maintenance, not to initial margin. Option C is the whole initial margin, not the amount needed.

Answer: B. $10,000. The loss threshold for a call is $7,500, which is the $30,000 initial margin minus the $22,500 maintenance margin. The $10,000 loss is larger than $7,500, so a call is triggered. The deposit restores the balance to the $30,000 initial margin, so it equals $30,000 − $20,000 = $10,000.

Exam tips

Questions often test the direction of the target: under the CFA convention, variation margin restores the account to initial margin, not maintenance. Expect an option built on the wrong target.
Check long versus short before any arithmetic. A wrong-sign option is nearly always among the three choices.
Do not multiply by the contract size or by the number of contracts twice, and do not forget either one. Write units out.
For conceptual items, link each feature to its role: novation to counterparty risk, margin to loss cover, marking to market to loss accumulation.
Remember forwards have no daily settlement and no clearinghouse by default; a statement saying otherwise is a trap.

Practice questions from Derivative Instrument and Derivative Market Features

Central Clearing and Margin Mechanics in other exams

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

Central Clearing and Margin Mechanics: frequently asked questions

What is the role of a clearinghouse in derivatives?

The clearinghouse becomes the counterparty to both sides of every trade, which is called novation. It guarantees performance, sets and collects margin, and settles gains and losses daily. This removes the risk that one trader defaults on another.

What is the difference between initial, maintenance and variation margin?

Initial margin is the deposit made when you open a position. Maintenance margin is the lower minimum balance you must keep. Variation margin is the deposit you make after a margin call; under the CFA curriculum convention it brings the balance back up to initial margin, though exchange practice can differ.

How does marking to market work in futures?

At the end of each day the contract is revalued at the settlement price. Gains are credited and losses are debited to the margin account. This resets the contract's value to zero and stops losses from building up unnoticed.

Does central clearing remove all risk from a derivative?

No. It removes counterparty default risk to a large degree, but you still carry market risk, meaning the price of the underlying can move against you. Clearing members and the clearinghouse also rely on margin and default funds that have limits.