Synthetic Futures Using Options
A synthetic long futures position was created by simultaneously buying a call option and selling a put option at the same strike price and expiry on Nifty or Bank Nifty, replicating the payoff profile of a long futures contract without holding the futures contract directly.
Put-call parity in options theory established that a long call combined with a short put at the same strike and expiry on the same underlying had a payoff profile identical to a long futures contract at that strike. This equivalence was the foundation of synthetic futures construction. In practice, the synthetic long did not perfectly replicate the futures position due to margin structure differences and the option premium flows, but the payoff at expiry was mathematically equivalent.
The motivation for using synthetic futures in Indian F&O arose from situations where the futures market spread (bid-ask difference) was wider than in options, where specific strike prices were not directly available in futures, or where cash flow management favoured options premiums over futures mark-to-market settlement. Occasionally, synthetic futures trading was used in arbitrage strategies where a mispricing between the synthetic and the actual futures could be locked in risk-free.
For a synthetic long, the net premium paid or received depended on the relationship between call and put premiums at the chosen strike. If the underlying was trading above the chosen strike, the call was in-the-money and its premium exceeded the put premium, resulting in a net debit for the synthetic long. If the underlying was below the strike, the put was more expensive, and the synthetic long generated a net credit — effectively compensating for the out-of-the-money call position.
Institutional participants used synthetic futures for hedging in specific circumstances where futures were unavailable or illiquid — for example, in single-stock segments where futures liquidity was poor relative to options liquidity. Building a synthetic long through options in such cases provided the desired delta exposure without the execution cost of trading in a thin futures market.
From a margin perspective, the synthetic long attracted options margin treatment rather than futures margin, which in some market conditions resulted in different capital requirements. Risk managers at brokerages were required to recognise synthetic futures positions as economically equivalent to outright futures when assessing client portfolio risk, even if the accounting treatment differed.