Four pages on this site tell you to close single-stock derivative positions before expiry unless you intend delivery. None of them explain what happens if you do not, because each one was about something else.
This is that explanation, and it matters because the failure mode is not a bad trade. It is an obligation several times larger than anything you thought you had taken on.
Two settlement regimes, and which one you are in
Indian derivatives settle in one of two ways, and the difference depends entirely on the underlying.
Index derivatives settle in cash. Nobody delivers the Nifty. At expiry the difference between your position and the settlement level is paid or received, the position disappears, and nothing else is required of you. This is what most people picture when they think about expiry, and for index positions the picture is correct.
Single-stock derivatives settle by delivery. If your position on a company's contract is in the money at expiry, actual shares change hands. A buyer receives shares and pays the full contract value; a seller delivers shares and receives that value.
The size difference is the entire problem. A single-stock option might cost a few thousand rupees to buy. The contract underneath it can represent several lakh of shares. So long as you close before expiry, the premium is the whole story. Hold it into settlement while in the money, and the full contract value arrives as an obligation.
One mercy worth knowing: Indian options are European-style, so they can only be exercised at expiry, never before. Nobody can assign a position to you on an ordinary Tuesday. The risk is concentrated entirely at one known moment, which makes it manageable in a way the American-style version is not.
What actually triggers delivery
The trigger is being in the money at expiry, and the word to be precise about is the position you are left holding.
If you bought a call option and the share closes above your strike, you are obliged to take delivery and pay the full contract value. A position that cost you six thousand rupees can become a requirement to fund several lakh, and the funds are needed regardless of whether you intended any of it.
If you sold a call option and it finishes in the money, you must deliver the shares. If you do not hold them, that is a short delivery, and short delivery is resolved through an auction where the cost is set by the market rather than by you. This is comfortably the most expensive way to be wrong in this entire subject.
Put positions mirror this. A bought put finishing in the money means you deliver shares; a sold put in the money means you take delivery and pay for it.
Two details that catch people. First, being in the money by a single rupee is enough — there is no threshold below which the exchange ignores it. Second, a position that was comfortably out of the money on Wednesday can finish in the money on Thursday, so a cheap far-strike position bought and forgotten is exactly the kind that produces a surprise.
Note that the danger is not limited to positions you thought were live. It applies with equal force to the ones you stopped paying attention to because they had lost most of their value.
Why margin rises through expiry week
Brokers and exchanges know all of this, so they act before you do. Starting a few days before expiry, the amount blocked against single-stock derivative positions is increased in steps, rising each day until expiry.
The logic is straightforward: as expiry approaches, the chance that a position ends in delivery rises, and the system needs collateral against the full contract value rather than against a price movement. So the requirement climbs towards the delivery-sized figure rather than the option-sized one.
The practical effect surprises people every month. An account comfortably funded on Monday can be short on Wednesday without a single new position, purely because the requirement on existing positions climbed. And a shortfall carries a penalty and hands your broker the right to square off at whatever price exists at that moment.
This is also why brokers close out unfunded single-stock positions in the final days rather than waiting. It is not a courtesy and it is not personal — they are managing their own exposure to your obligation.
The rule, and the one legitimate exception
The rule is unconditional and worth treating as such: close single-stock derivative positions before expiry unless you specifically intend delivery and have funded it.
Not “usually”, not “if convenient”. Anybody who cannot check positions during the expiry session should close them a day earlier, because the version of this that goes wrong is always the one where somebody was unavailable rather than the one where somebody was mistaken.
The legitimate exception is the covered position, and it is a real one. If you already own the shares and have sold a call option against them, delivery is not a failure — it is the arrangement working as designed. You hand over shares you hold and receive the strike price. That is the intended outcome, and the only thing to confirm is that the holding is genuinely there and unencumbered, because shares pledged as collateral elsewhere are not available to deliver.
The mirror case is the sold put where you intended to acquire the shares anyway and have the funds ready. Also fine, also deliberate, and also entirely different from discovering an obligation on a Thursday evening.
Everything else — the cheap far-strike position, the forgotten leg of a structure, the spread where one side was closed and the other was not — belongs closed before the session ends.
See what your broker blocks
The figures step up daily on single-stock positions. Account free to open
Settlement rules, margin steps and auction procedures are set by the exchanges and brokers and are revised from time to time — confirm current requirements with your own broker rather than relying on any description here. This is educational material, not advice. We run no tips group and no signal service, we manage nobody's money, and no return is promised. Derivatives can create obligations far larger than the amount paid to enter them.
Disclosure: the account-opening link on this page is under Atul Shrivastava's Zerodha Authorised Person registration (NSE AP Reg: AP2516003481; Zerodha Broking Ltd. SEBI Reg: INZ000031633) and earns a revenue share. TheFinBaba is not a SEBI-registered Investment Adviser — this content is educational, not investment advice.
Frequently Asked Questions
Which contracts settle physically in India?
Single-stock futures and options settle by delivery of the underlying shares. Index derivatives settle in cash, so a Nifty or Bank Nifty position simply pays or receives the difference at expiry and requires nothing further from you.
What happens if I forget to close an in-the-money stock option?
It goes to delivery. A bought call option means you must take the shares and pay the full contract value; a sold call option means you must deliver shares you may not own, which becomes a short delivery resolved through an auction at a cost set by the market.
Why has my margin increased even though I have not traded?
Because expiry is approaching. Requirements on single-stock derivative positions are raised in steps through the final days, moving towards the full delivery value rather than the option value. An account funded adequately on Monday can be short by Wednesday for this reason alone.
Can my option be exercised before expiry?
No. Indian options are European-style, exercisable only at expiry. Nobody can assign a position to you mid-cycle, which means the entire delivery risk sits at one predictable moment. That is what makes closing positions in advance a complete defence.
Is delivery ever the outcome I want?
Yes, in a covered arrangement. If you own the shares and have sold a call option against them, delivery is the design rather than an accident. Confirm the shares are actually available and not pledged elsewhere, because collateral committed to something else cannot be delivered.
Related Reading
- The options course, for Gujarat's F&O traders
- How the blocked amount is computed
- What the expiry session does differently
- The one case where delivery is the plan
- Obligation versus right, compared
- Contract mechanics, taught in order
Disclaimer: TheFinBaba provides educational content only - this is not investment advice. Trading involves risk of loss.
