Futures Spreads: Calendar, Relative Value and Execution Risk

1. Identify the instruments and define the spread

1.1 Futures versus options

A futures contract creates obligations according to its settlement rules and typically involves margin and cash-flow obligations as prices change. An option gives its buyer a defined right under its terms, normally acquired through a premium; the writer has the corresponding obligation. An options calendar spread therefore cannot be analysed as though it were simply two futures prices. Its value can depend nonlinearly on volatility, time and strike as well as the underlying price.

1.2 Sign conventions and matched exposure

For this topic define S=far-expiry futures price minus near-expiry futures price. Long the spread means buying the far contract and selling the near contract in matched underlying units. Gross change in value is Q×(change in far−change in near)=Q×change in S when multipliers and units match. Trading screens can use another convention. Record the actual legs rather than relying on the word buy spread.

Step-by-step method

1. Identify the legal contract and settlement method for each leg.
2. Write the spread formula before choosing a direction.
3. Convert contracts into comparable underlying exposure.

2. Explain the calendar difference before calling it mispriced

2.1 Carry and expected distributions

Different expiry prices can reflect financing, expected cash distributions, settlement features, supply and demand and the time remaining to expiry. A nonzero calendar difference is not evidence of mispricing. In a simplified cash-and-carry framework for a financial asset, theoretical futures value depends on spot value, financing over the contract period and distributions. Real implementability also depends on borrowing, trading costs, taxes, restrictions and the exact contract adjustment rules.

2.2 Basis and the expiry boundary

Basis means a specified difference between futures and the underlying cash price; analysts use opposite sign conventions, so define yours. A calendar spread is the difference between two futures bases when they share the same spot reference. Each expiry approaches its own settlement conditions, but the two contracts do not necessarily converge to each other while both remain open. Delivery or settlement can create new obligations if one leg expires first.

Step-by-step method

1. Estimate a range of fair carry using documented assumptions.
2. Check dividend and corporate-action treatment for each contract.
3. Map both expiries and the required close, roll or settlement action.

3. Extend the idea to related assets carefully

3.1 Ratios and economic drivers

Cross-asset spreads pair different underlyings, such as related businesses or commodities. Equal contract counts may produce unequal exposure because prices, multipliers and sensitivities differ. A notional-neutral ratio matches approximate currency amounts; a beta or factor ratio attempts to match a selected market sensitivity. Neither neutralises every risk. The hedge ratio is an estimate that changes with data, business conditions and the intended holding horizon.

3.2 Correlation is not a contractual hedge

A relationship can weaken because one issuer has a governance event, debt problem, production outage or different currency sensitivity. Historical correlation describes a sample; it is not a promise that prices will move together next week. Commodity relationships can also depend on conversion yields, storage and location. Use a commercial or financial explanation for the pairing, stress each leg separately and distinguish a statistical association from an enforceable conversion relationship.

Step-by-step method

1. Convert each contract to currency and factor exposure.
2. State the ratio method, estimation period and uncertainty.
3. Stress a sharp adverse move in either leg independently.

4. Model cash, margin and execution as separate risks

4.1 Conditional offsets and liquidity buffers

Clearing systems may recognise specified offsetting positions when calculating margin. Eligibility, account-level netting, methodology and current parameters determine any benefit; no universal NCCPL calendar-spread offset is assumed here. Ask the broker for the applicable written calculation and the consequences of changing or closing one leg. A collateral concession is not a maximum-loss guarantee, and adverse valuation can still demand cash when the overall strategy appears economically hedged.

4.2 Legging and close-out failure

If the legs are entered separately, the first can fill while the second fails or reprices. That legging risk also exists during exit and rolling. Do not assume a simultaneous spread-order facility is available. Quote depth, price limits, halts and settlement constraints can block the intended hedge. Prepare a maximum unmatched exposure, an acceptable price difference and a response if only part of the intended quantity trades.

Step-by-step method

1. Obtain actual margin terms and stress larger cash calls.
2. Budget fees and bid-ask costs across all opening and closing legs.
3. Define handling for partial fills, unmatched legs and lost access.

5. Reconcile the spread result and test the thesis

5.1 A complete profit worksheet

Suppose near and far prices begin at100 and103, so S begins at3. Later they are102 and104, so S is2. For1,000 matched underlying units long far and short near, the far gains1,000 while the near loses2,000: combined gross loss1,000. If the final far were106 instead, S would be4 and combined gross gain1,000. Charges, financing, tax treatment and any settlement adjustments are additional.

5.2 Evaluation beyond a successful outcome

Record each actual fill, quantity, timestamp and cash entry rather than calculating from chart midpoints. Compare the realised difference with the thesis, cost assumptions and largest funding requirement. A profitable result does not prove an initial discrepancy was an arbitrage; broad price movements or chance can help a poorly designed trade. Use paper scenarios first and judge whether the relationship, access and liquidity assumptions remain credible.

Step-by-step method

1. Calculate each leg independently, then sum and deduct relevant costs.
2. Reconcile cash and securities or settlement obligations with broker records.
3. Review the original driver and the worst plausible funding path.

A spread decision depends on linked controls

Reference table

Glossary of key terms

Basis

A defined futures-minus-cash or cash-minus-futures difference; state the convention.

Calendar spread

Opposing futures positions in the same underlying at different expiries.

Carry

Financing and other holding effects connecting cash and futures values.

Hedge ratio

The chosen relationship between quantities or sensitivities of the legs.

Legging risk

Exposure created when linked transactions do not execute together as intended.

Margin offset

A conditional collateral reduction for recognised risk offsets.

Multiplier

The contractual conversion from a price movement to money per contract.

Frequently asked questions

Common pitfalls