Premium margin
A margin charged at client level on option buyers equal to the premium they owe the clearing corporation, levied until the premium settlement pay-in is complete.
In plain language
An option buyer owes the seller a premium. The trade happens today, but the money moves through daily premium settlement on T+1. For that gap, the clearing corporation is exposed: what if the buyer does not pay?
Premium margin closes that gap. The workbook's definition: along with Initial Margin, Premium Margin is also charged at the client level. Premium margin includes premium amount due to be paid to the Clearing Corporation towards premium settlement, at the client level. Premium margin is levied till the completion of pay-in towards the premium settlement.
In plain words: the premium you owe is blocked as margin until you actually pay it. Once the premium is paid in, the premium margin falls away.
How it works
Where it sits. Chapter 7, section 7.6 lists the margins in the equity derivatives segment: initial margin (SPAN-based), premium margin, assignment margin, intraday crystallised losses, delivery margins and exposure margins.
The settlement it protects (section 7.4): premium payable and receivable amounts are netted per client per option contract; clearing members with a net payable pay the clearing corporation, which passes it to members with a net receivable; the amounts are debited and credited to clearing bank accounts on T+1.
A contradiction inside the workbook. Chapter 4, section 4.5, says a call or put buyer need not pay any margin, because his obligation is limited to the premium already paid; and the futures-versus-options table says only the option seller pays initial margin and MTM. Chapter 7 then charges premium margin at client level. The two fit once you notice what each is about: the buyer pays no initial or MTM margin for risk, but the unpaid premium itself is blocked until settlement.
A later tightening. Chapter 7, section 7.10, adds that from 1 February 2025 trading members must collect the entire premium upfront from option buyers, to limit undue leverage.
The formula
Premium margin (client) = Net premium payable to the clearing corporation
= Premium per unit × Lot size × Number of lots (net of premium receivable)
A worked example
Using the workbook's Nifty option quotes from Chapter 4 and its assumed lot size of 50:
On day T, Neha buys 2 lots of the Nifty 18,400 call at Rs 124.50, and sells 1 lot of the Nifty 18,400 put at Rs 177.60.
Premium payable on calls = 124.50 × 50 × 2 = Rs 12,450
Premium receivable on put = 177.60 × 50 × 1 = Rs 8,880
Payable and receivable are netted per option contract, and the call and the put are different contracts, so the call premium is not offset by the put premium. Her premium margin for the calls is Rs 12,450, blocked from the moment of the trade until the pay-in on T+1.
The short put is a different story: as an option seller she has an obligation, so the put attracts initial margin under SPAN, not premium margin.
And under the rule effective 1 February 2025, her broker must have collected the full Rs 12,450 upfront before letting her buy the calls.
Why NISM asks about it
Chapter 7, section 7.6 (Margining and mark to market under SPAN), defines premium margin; section 7.4 describes daily premium settlement on T+1; section 7.10 records upfront collection of option premium from 1 February 2025. Chapter 4, sections 4.5 and 4.6, carry the statement that option buyers pay no margin. Expect a question on which margin applies to an option buyer — and read the options carefully.
Common exam traps
- The workbook says both "option buyers pay no margin" (Chapter 4) and "premium margin is charged at client level" (Chapter 7). The first is about risk margins; the second is the unpaid premium itself. If a question asks whether an option buyer pays initial margin, the answer is no.
- Premium margin lasts only until premium pay-in is complete.
- Premium settlement is T+1.
- Netting is per client per option contract, not across different contracts.
- Option sellers pay initial margin, not premium margin.
- From 1 February 2025, the entire premium is collected upfront from buyers.
Where this is taught
- Series XXI-B · Chapter 5: Derivativesintroduced here
- Series VIII · Chapter 7: Clearing, Settlement and Risk Managementintroduced here
- Series X-A · Chapter 10: Understanding Derivativesintroduced here
Related terms
- SPANThe scenario-based system clearing corporations use to compute initial margin — it revalues a client's whole derivatives portfolio under sixteen what-if scenarios and charges the worst loss.
- Clearing corporationThe entity that steps between every buyer and seller in the derivatives segment by novation, becoming the counterparty to both sides and guaranteeing that the trade settles.
- Option premiumThe price an option buyer pays the seller for the right the contract carries — non-refundable, and made up of intrinsic value plus time value.
- Peak marginThe highest intraday margin requirement of a client, measured from at least four clearing corporation snapshots a day; brokers are penalised if collected margin falls short of it.
- Initial marginThe deposit both the buyer and the seller of a futures contract must place before the position is accepted, sized to cover a 99% worst-case one-day loss on that position.
- Daily premium settlementThe daily process that nets each client's option premium payable against receivable and settles the difference through the clearing member's bank account on T+1.
- Exposure marginA derivatives-segment margin charged as a percentage of the notional value of an open position, on top of initial margin; on options it is collected only from sellers.
- MarginThe money a buyer or seller must deposit before a trade is allowed to stand, so that the clearing corporation is covered if they fail to bring in funds or to deliver securities.
- Assignment marginA margin collected on an option position for its final settlement obligation, on top of the initial, exposure and premium margins, levied until the pay-in towards exercise settlement is complete.