Premium style option

When you buy an option, something has to happen with the premium. In a premium style option, that something is simple: the buyer pays the full premium upfront, to acquire the right the option gives.

The workbook's general definition of an option makes this the default mechanic: "For acquiring right option buyer pay certain price/premium to option seller." In its worked land-purchase example, the buyer, Mr X, "pays an upfront fee of Rs 50,000 today" to the seller, Mr Y, for the right to buy the land later. The contract specification table for Exchange Traded Interest Rate Options confirms this is exactly the structure used: "Option Type: Premium style European Call & Put Options."

Two classification questions apply to any option, and the workbook answers both for exchange-traded interest rate options in the same table entry:

1. When can it be exercised? — this is the European/American/Bermuda classification (a separate axis, covered in section 4.3). Exchange traded IROs are European, exercisable only on the expiration date.
2. How is the premium settled? — this is the premium style classification. The buyer pays the entire option premium upfront, in cash, at the time of the trade, in exchange for the right the option confers.

The upfront-payment mechanic follows directly from how the workbook distinguishes options from futures (section 4.2): in a futures contract, no premium changes hands at all — both parties are under an obligation and face margin requirements from day one. In an option, the buyer has only a right and no obligation, and pays for that asymmetry with a premium — paid upfront — while the seller receives the premium and takes on the obligation.

For Exchange Traded Interest Rate Options specifically, the contract specification table sets: strike price interval of Rs 0.25; a minimum of eight in-the-money, eight out-of-the-money and one near-the-money strike for every available contract; a three serial monthly plus three quarter-end (Mar/Jun/Sep/Dec) trading cycle; expiry on the last Thursday of the month; and cash settlement, with the final settlement price based on the weighted average price of the underlying bond over the last two hours of trading on NDS-OM (or the FIMMDA/FBIL price if fewer than 5 trades occurred in that window).

Ms Fatima Sheikh buys 1 lot of an Exchange Traded Interest Rate Option — a European call, premium style — on a 10-year Government of India bond, with a strike of Rs 100.00 (one of the strikes available under the Rs 0.25 interval, alongside Rs 99.75 and Rs 100.25).

At the time of the trade, she pays the full option premium upfront, in cash, to the seller — exactly as the general option mechanics describe, and exactly as the land-purchase example illustrates with its "Rs 50,000 paid today". She does not post ongoing margin on the premium itself; having paid it, her maximum loss on this position is now capped at the premium she has already handed over.

Because the option is European, she cannot exercise it early even if the bond price moves favourably the next day — she can only let it run to the last Thursday of the month expiry, or sell the option itself in the market to square off her position before then. If, at expiry, the underlying bond's weighted average NDS-OM price over the last two hours of trading is above her Rs 100.00 strike, her call finishes in-the-money and she receives the cash settlement difference; if not, the option expires worthless and her loss is limited to the premium she paid upfront — no more, because no more was ever asked of her.

Chapter 4 (Exchange Traded Interest Rate Options), section 4.9 (Contract Specification of Exchange Traded Interest Rate Options), labels the Option Type as "Premium style European Call & Put Options" in the same row of the specification table that fixes the strike price interval and the number of strikes; the general option mechanics in sections 4.1 and 4.2 supply the reasoning for why the premium is paid upfront. Expect the contract-specification detail tested directly — what style and type of option is an Exchange Traded IRO — alongside the general premium-payment mechanic.

• "Premium style" is about how the premium is settled (paid upfront); "European" is about when the option can be exercised. These are two separate classifications bundled into one contract-spec label — a question may isolate either one.
• The premium is paid at trade time, not spread over the life of the contract. Unlike a futures contract's daily mark-to-market, there is no ongoing settlement of the premium itself.
• Paying the premium upfront caps the buyer's maximum loss at that premium — this follows from the general option mechanics (buyer has rights only, "faces only the risk of premium paid"), not from anything unique to interest rate options.
• The workbook labels the IRO contract type "premium style" but does not describe any alternative structure in detail — do not invent or assume specifics of a contrasting "margin style" or "futures style" option beyond what is stated here.
• Do not confuse the strike price interval (Rs 0.25) or the minimum number of strikes (8 ITM, 8 OTM, 1 near-the-money) with the premium style itself — they are separate rows of the same contract specification table, often tested together but answering different questions.