Do Not Exercise (DNE)
An expiry-day instruction to voluntarily waive automatic exercise of an in-the-money option — a critical tool for managing disproportionate STT charges in Indian equity options.
Definition
Do Not Exercise (DNE) is a formal instruction submitted by an option buyer to their broker before the expiry deadline, directing that a specific in-the-money option contract should not be automatically exercised at settlement — even though it has positive intrinsic value. NSE's rules provide for automatic exercise of all in-the-money European-style options at expiry; DNE overrides this default. By filing a DNE, the buyer voluntarily forfeits the intrinsic value of the option, allowing it to expire worthless. This sounds counterintuitive, but it is a rational response to India's unique STT structure on exercised options.
Why it matters
Indian equity options are subject to a materially higher STT rate when they are exercised versus when they are squared off in the market. When an option is exercised (or expires in-the-money and is automatically settled), STT under Indian law is charged on the full notional settlement value — the closing price of the underlying multiplied by the lot size. This is dramatically different from the STT on an intraday square-off, which is based only on the option premium received.
For stock options — where lot sizes and underlying prices can be large — the STT on exercise can easily exceed the intrinsic value the buyer would receive. For example, a stock option that is ₹2 in-the-money on a stock trading at ₹800 with a lot size of 500 yields an intrinsic value of ₹1,000. But STT on exercise is computed on ₹800 × 500 = ₹4,00,000, and at even a modest STT rate, can be several thousand rupees — far more than the ₹1,000 gain. In such cases, filing DNE eliminates the STT liability entirely, and the trader is better off losing the ₹1,000 intrinsic value than paying a larger STT bill.
DNE is less commonly needed for index options (Nifty, Bank Nifty, Fin Nifty, Midcap Nifty) because index options are cash-settled and the STT differential on exercise is smaller — but traders should still run the calculation on expiry day, especially for weekly expirations where options can land marginally in-the-money. The DNE instruction deadline varies by broker; most require submission before 4:00 PM IST on expiry day, though NSE's own cut-off is typically 4:30 PM IST. Missing this window results in automatic exercise and the consequent STT charge.
How it works
On expiry day, NSE automatically exercises all in-the-money equity and index options based on the final settlement price (determined by the average of the underlying index or stock price during the last 30 minutes of trading, 3:00–3:30 PM IST). If you have bought an option that expires in-the-money and do not wish to exercise, you must submit a DNE request through your broker's trading platform or back-office system before their stated cut-off. Upon receiving a valid DNE, the exchange treats the contract as worthless at expiry — no settlement, no STT on notional value. The premium already paid is fully lost, but no further obligations arise. DNE cannot be applied selectively to partial lots; it applies to the full open position in that contract. Note that option sellers (writers) cannot file DNE — it is exclusively a buyer's right.
Example
Suppose you bought 1 lot of a Reliance Industries call option (hypothetical lot size: 250) at a strike of ₹2,900. On weekly expiry, Reliance closes at ₹2,910 — your option expires ₹10 in-the-money, giving an intrinsic value of ₹10 × 250 = ₹2,500. If exercised, STT would be applied to the notional settlement value of ₹2,910 × 250 = ₹7,27,500. At the applicable exercise STT rate, this charge could be substantially above ₹2,500. Filing DNE means you forfeit the ₹2,500 intrinsic value but avoid the larger STT outgo — a net improvement. Had the option been ₹50 in-the-money instead (intrinsic value ₹12,500), the STT on exercise might still be less than the gain, making exercise the correct choice. Always compute both scenarios before the broker's cut-off.
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