Short Delivery Auction on NSE: What Happens When a Seller Fails to Deliver Shares

A short delivery auction on NSE is what kicks in when a seller fails to hand over the shares they sold by the settlement deadline. The buyer is left waiting. The clearing corporation steps in and buys the missing shares from the market. And the seller pays whatever that costs, plus charges. If you shorted a stock that got stuck at the upper circuit, or sold shares before they landed in your demat account, the bill can be far bigger than the trade itself. We cover why short deliveries happen, how the NSE auction and close-out rules work under T+1 settlement, what buyers and sellers actually see, and the money involved, with worked examples.

For day-to-day context, keep our Stock Market Today India hub open. A stock locking at its upper limit is one of the most common triggers, so our explainer on price bands and circuit limits on NSE is good background reading.

Short delivery in a T+1 world

Indian equities settle on a T+1 cycle. You trade on day T, and the shares and money change hands on the next working day. NSE Clearing’s securities settlement page says clearing members and custodians must make the required securities available in their settlement pool accounts by 10:30 a.m. on the pay-in day. NSE Clearing then works out the shortages, and the payout is released directly to clients’ demat accounts by 3:30 p.m.

Whatever a seller was meant to deliver but didn’t is a shortage, or short delivery. The buyer on the other side simply doesn’t get those shares in the normal payout. Instead, as the same NSE Clearing page puts it, for short deliveries in the normal segment, including members’ internal shortages, NSE Clearing conducts a buy-in auction on T+1 itself, and settlement of that auction is completed on T+2.

In a short delivery, the seller loses control of the price. The clearing corporation buys the missing shares wherever the auction clears, or closes out the trade at a penalty price, and the seller pays the difference.

How traders end up short-delivering

Zerodha’s support note on short delivery lists three situations that trip up retail traders most often:

• An intraday short you could not cover. You sell a stock intraday planning to buy it back the same day, but the stock hits the upper circuit and you cannot buy it back to square off. Now you owe shares you don’t have.
• A BTST sale before credit. In a Buy Today, Sell Tomorrow trade you sell shares before they have been credited to your demat account. If the seller who owed you those shares short-delivers, you in turn cannot deliver to your own buyer.
• Physical settlement in F&O. You hold stock futures or in-the-money stock options into expiry where settlement requires delivery of shares, and you do not have them.

Zerodha also flags a fourth, more technical case, and it catches people out. If the stock is already in your demat account but you have not given a DDPI or POA and do not authorise the sale when asked, the delivery fails even though you own the shares. In the F&O case, it says you can avoid the auction by moving the shares into your demat account from another demat on the same T day.

Inside the short delivery auction on NSE

NSE’s shortages handling page spells out the sequence:

1. Identification. On the settlement day NSE Clearing accepts pay-in of securities and identifies the shortages.
2. Valuation debit. The short-delivering member is debited an amount equal to the undelivered securities valued at a valuation price. For failure to deliver, this is the settlement price on the trading day just before the pay-in day, and NSE says the settlement price is based on the volume-weighted average price of the last 30 minutes across exchanges.
3. Buy-in auction. NSE Clearing runs a buying-in auction on T+1, after the payout is complete, through the NSE trading system.
4. Difference. If the auction price is higher than the valuation price, the clearing member must make good the difference.
5. Close-out. All shortages that are not bought in are deemed closed out.

On timing and price, Zerodha’s note says the voluntary auction usually starts after 2:30 p.m. on T+1 and lasts 30 minutes, with bids typically allowed within ±20% of the previous day’s settlement price. Take those as broker guidance. The exchange’s own circulars are the final word, and they can change.

Internal shortages are auctioned too

Sometimes buyer and seller are clients of the same broker. That’s called an internal shortage. NSE Clearing’s settlement page says it is now mandatory for members to handle internal shortages through the clearing corporation’s auction, and that NSE Clearing identifies them by comparing a member’s gross sell obligation with the pay-in it actually received. NSE’s shortages page adds a facilitation fee of 1% on the value of the security auctioned, using the price of the security on the day before the auction, collected monthly with applicable taxes.

When the auction comes up empty: close-out pricing

If the auction can’t buy all the missing shares, the rest is closed out in cash. NSE’s shortages page, citing SEBI circular SMD/Policy/Cir-03/2002 of January 30, 2002, says close-out in the normal market is at the highest price prevailing across the exchanges from the day of trading till the auction day, or 20% above the settlement price on the auction day, whichever is higher.

The close-out price can never be lower than the highest price seen in that window. Put simply, a seller cannot come out ahead by failing to deliver. NSE lists a few special cases:

• Block deals and Trade for Trade surveillance stocks: shortages are closed out directly at settlement, at the highest price across exchanges from the day of trading till T day or 20% above T-day settlement price, whichever is higher.
• Corporate actions: if auction payout cannot be done on or before the record date or book closure minus one business day, cum-basis shortages are closed out directly at the highest price from the day of trading till the auction day or 10% above the auction-day settlement price, whichever is higher.
• Auction seller default: if the seller in the auction itself fails to deliver, that deal is closed out at the higher of the highest price from the original trade day till the auction day or 20% over the auction-day settlement price, charged to the auction seller.

NSE Clearing’s settlement page also notes that for the Z settlement type there is a direct close-out rather than an auction. For T+0 trades, any shortage in the early pay-in is closed out directly; our guide to T+0 settlement on NSE covers that cycle.

The close-out price is the higher of the period’s highest price or 20% above the auction-day settlement price. Either way, it is at least the highest price seen since the trade.

Running the numbers: a short seller stuck at the upper circuit

Every figure here is hypothetical, picked only to show the arithmetic. Suppose you short 200 shares of a stock intraday at ₹500 on Monday (T day). The stock hits its upper circuit and you cannot buy back, so you short-deliver. Assume Monday’s settlement price is ₹540.

Case A: the auction buys all 200 shares at ₹600

You are charged the auction cost of 200 × ₹600 = ₹1,20,000. You received ₹1,00,000, so that’s a ₹20,000 loss before charges. The charge depends on whether the buyer was with another broker or with yours, and Zerodha’s note gives both rates, each based on the price on the day before the auction (here ₹540) times quantity, so a security value of ₹1,08,000:

• Exchange shortage (buyer at another broker): a penalty of 0.05%, or ₹54, plus 18% GST of ₹9.72, for a total of ₹63.72.
• Internal shortage (buyer at your broker): the 1% auction facilitation fee, or ₹1,080, plus 18% GST of ₹194.40, for a total of ₹1,274.40.

Zerodha also notes that if the auction buys shares below the T-day settlement price, the exchange collects the difference and sends it to the Investor Protection Fund. So even a cheap auction does not hand the seller a profit.

Case B: the auction fails and the trade is closed out

Now say nobody offers shares in the auction. The highest price across exchanges from Monday to the auction day was ₹610, and the auction-day settlement price is ₹560. Under NSE’s rule, the close-out price is the higher of ₹610 and 20% above ₹560, which is ₹672. Since ₹672 is higher, you are charged 200 × ₹672 = ₹1,34,400, a loss of ₹34,400 against your ₹1,00,000 sale. The buyer receives ₹1,34,400 in cash instead of shares.

Case C: the auction fills only part of the order

Zerodha’s note explains that when an auction fills only part of the shortage, a weighted average price (WAP) is used for the whole quantity. Using the same hypothetical numbers, say 150 shares are bought at ₹600 and 50 are closed out at ₹672. The total cost is (150 × ₹600) + (50 × ₹672) = ₹90,000 + ₹33,600 = ₹1,23,600, and the WAP is ₹1,23,600 ÷ 200 = ₹618 per share. You are debited ₹618 for all 200 shares, while the buyer receives the 150 shares plus ₹672 a share in cash for the 50 that could not be bought.

The view from the buyer’s side

For the buyer, the main cost is time. Using Zerodha’s own timeline for a Monday purchase: the shares would normally show as T1 holdings until Tuesday. If they are not delivered on Tuesday, a short delivery tag appears on Wednesday, the shares bought in Tuesday’s auction are delivered on Wednesday (T+2), and they show on its platform from Thursday. If the auction fails, you get cash at the close-out price instead. That may be more than you paid. But you lose the position, and that hurts if you bought for a dividend, a corporate action or a long-term holding.

Staying out of trouble

• Think twice before shorting stocks near their circuit limits. If the stock locks at the upper circuit, an intraday short you cannot cover becomes a delivery obligation. Size such trades on the assumption that the worst case is a close-out at 20% above the settlement price; our risk management in trading guide covers position sizing.
• Know the BTST risk. Selling shares before they reach your demat account depends on your own seller delivering. If an auction bill would hurt, just wait for the credit.
• Plan F&O expiries. If you hold in-the-money stock options or futures into expiry, either arrange the shares in time or close the position before expiry.
• Authorise your sales. If you do not have a DDPI on file, complete your broker’s sale authorisation for every delivery sale so a sale of shares you own does not fail.
• Watch your broker’s alerts. Zerodha, for example, says it sends email and app notifications to buyers when a short delivery happens and blocks a short delivery margin on the seller’s account. Check your own broker’s alerts and margin statement the same day.

Quick answers

Who pays when shares are short-delivered?

The short-delivering seller. NSE’s shortages page says the member is first debited at the valuation price and must make good any excess if the auction price is higher. Zerodha’s note shows the seller’s account being debited the auction cost and charges.

When does the buyer get the shares after a short delivery?

Under the current T+1 cycle, NSE Clearing runs the auction on T+1 and completes its settlement on T+2, so the buyer typically receives the auctioned shares on T+2 instead of T+1. If the auction fails, the buyer receives cash at the close-out price.

Can a seller make money from a short delivery?

No. If the auction buys below the settlement price, Zerodha’s note says the difference goes to the Investor Protection Fund rather than to the seller, and if the auction fails, the close-out price is set at the higher of two penalty benchmarks.

This article is for education only and is not investment advice. The worked examples use hypothetical prices, settlement prices and quantities. Auction timings, price bands, margins and charges are set by NSE Clearing, SEBI and individual brokers and can change; check the latest NSE Clearing circulars and your broker’s policy before trading. Consult a SEBI-registered adviser before making investment decisions.