Forwards & Futures Interview Revision: Pricing, Margins and Daily Settlement
Can a futures price go negative, even when every beginner has learnt that “price cannot be below zero”? Crude oil proved it can - and the shock was not just about oil, but about how standardized contracts, settlement rules, margins and liquidity collide in the real market.
- A forward is a customized OTC contract to buy or sell an asset later at a price fixed today.
- A future is a standardized exchange-traded forward-like contract with clearinghouse guarantee and daily mark-to-market settlement.
- No-arbitrage pricing says futures/forward price is driven by spot price plus carrying costs minus benefits or income.
- Daily settlement means futures gains and losses are credited or debited every trading day, not only at expiry.
- Margin is not a down payment; it is a performance bond to protect the clearing system from default.
- Basis = futures price - spot price; it usually converges near expiry, but basis risk can hurt hedgers.
- The safest interview answer separates three ideas: pricing logic, cash-flow mechanics and risk control.
Think of forwards and futures as two versions of the same promise: lock a price today for a transaction in the future. The difference is that a forward keeps the promise private until expiry, while a future turns the promise into a regulated, standardized, daily-cash-settled instrument.
Core Explanation: The Three Things You Must Separate
Most confusion disappears when you separate pricing, settlement and risk control.
Forwards vs Futures: The Clean Comparison
A forward contract is negotiated directly between two parties. A futures contract is standardized by an exchange, cleared through a clearing corporation and marked to market daily.
Pricing: The Cost-of-Carry Intuition
The fair forward or futures price is not a forecast of where the market “will go.” It is the price that prevents easy arbitrage between buying the asset today and agreeing to buy it later.
The cleanest version is:
Forward price = Spot price + carrying costs - income or convenience benefit
For a financial asset with no income, a simple one-period approximation is:
F0 = S0 × (1 + rT)
Where F0 is the fair forward price today, S0 is today’s spot price, r is the financing rate and T is time to maturity in years.
Worked Example: Fair Futures Price and Arbitrage Signal
Assume a stock trades at ₹1,000 today. The annual risk-free financing rate is 8%. The futures contract expires in 3 months. Ignore dividends.
Step 1: Convert time to years
T = 3/12 = 0.25
Step 2: Apply cost-of-carry pricing
F0 = 1,000 × (1 + 0.08 × 0.25) = 1,000 × 1.02 = ₹1,020
Step 3: Interpret
If the market futures price is ₹1,040, it is expensive versus fair value. A cash-and-carry arbitrageur could buy the stock, finance it, and sell the futures. If the market futures price is ₹1,000, the futures is cheap versus fair value, subject to transaction costs and short-selling feasibility.
Say: “The fair futures price is the spot price compounded by net carry. If market price deviates beyond transaction costs, arbitrage pressure should pull it back.”
Margins and Daily Settlement: Why Futures Feel Different
In a futures contract, the exchange does not wait until expiry to discover who has lost money. It recalculates gains and losses every day using the official settlement price.
Daily P&L for a long futures position = (Today’s settlement price - Previous settlement price) × Contract size
For a short position, the sign reverses.
Worked Example: Daily Settlement and Margin Call
A trader goes long one futures contract. Contract size is 1,000 units. Initial settlement price is ₹100. Initial margin is ₹20,000 and maintenance margin is ₹15,000.
The trader has not “paid for the asset.” The trader has posted collateral, lost cash through daily mark-to-market, and must restore the margin account when it falls below maintenance.
Key Measures to Track in Futures Positions
These are not just trading metrics. They are the measures that tell a hedger whether the futures position is doing its job without creating liquidity stress.
Definitions You Can Say in One Breath
- Forward contract: A private agreement to buy or sell an asset at a future date for a price fixed today.
- Futures contract: A standardized exchange-traded contract to buy or sell an asset later, with daily mark-to-market settlement.
- Spot price: The current market price for immediate purchase or sale of the asset.
- Basis: The difference between the futures price and the spot price of the underlying asset.
- Margin: Collateral posted to ensure contract performance, not a partial payment for the underlying asset.
- Mark-to-market: The daily process of recognizing gains and losses using the official settlement price.
Case Study: MCX and the Discipline of Daily Settlement
MCX shows why futures are not just price bets: exchange rules, settlement prices and margin discipline decide how risk is absorbed in real commodity markets.
India’s commodity participants - refiners, traders, jewellers, processors and financial participants - use exchange-traded futures to manage price risk in commodities such as crude oil, gold, silver and base metals. The attraction is clear: transparent prices, standardized contracts, clearinghouse-backed settlement and the ability to enter or exit without negotiating a private bilateral deal.
The real lesson became vivid during the global crude oil shock of 2020, when storage constraints and collapsing demand pushed the benchmark WTI crude futures price into negative territory. The point was not simply that oil was volatile. The deeper point was that a futures contract is a legal and operational system: it has a defined settlement methodology, daily mark-to-market, margin requirements and liquidity obligations.
The move: MCX’s exchange-traded structure relied on standard contract terms, official settlement prices, clearing processes and margin collection. These features are designed to reduce hidden counterparty risk. However, extreme price moves can still create liquidity stress because traders must meet daily variation margin in cash.
The lesson: The primary driver of resilience in futures markets is clearing and daily settlement discipline. Supporting drivers are transparent contract specifications, exchange-set margins, position limits, surveillance and participant liquidity. A candidate who says “futures are safe because the exchange guarantees them” is only half-right; the guarantee works because losses are collected continuously.
How AI Changes Forwards & Futures
AI does not change the no-arbitrage logic. It changes how quickly market participants detect mispricing, monitor risk and stress-test margin needs.
- Real-time basis and arbitrage monitoring: ML systems can scan spot prices, futures prices, funding rates, storage costs and transaction costs to flag unusual basis movements faster than manual screens.
- Dynamic margin and stress testing: Clearing members and risk teams increasingly use scenario engines to estimate how volatility spikes, correlation breaks or liquidity drops could affect margin calls.
- Hedge effectiveness analytics: AI can help treasury teams compare alternative hedge tenors, simulate cash-flow impact and detect when a futures hedge is no longer matching the underlying exposure.
Use NotebookLM or ChatGPT with a company annual report, NSE or MCX contract specifications, and this lesson. Ask: “Identify the firm’s commodity, currency or interest-rate exposures, suggest whether forwards or futures fit better, and list likely interview questions on hedge risk.”
Interview Relevance
“Explain the difference between forwards and futures. How is a futures contract priced, and what happens through daily settlement and margins?”
If the interviewer gives numbers, write the formula first. Then calculate. It signals that you understand the mechanism, not just the arithmetic.
Common Mistake
The biggest mistake is treating the futures price as a forecast and margin as a down payment. This costs candidates because it misses both no-arbitrage pricing and daily cash-flow risk. One-line fix: say, “Futures price is anchored by cost of carry; margin is collateral; daily settlement converts price moves into cash every day.”
What to Revise Next
Once forwards and futures are clear, move to options - because options add asymmetric payoffs and choice. Revise these next: