I short sold shares in intraday trading and was unable to buy them back. What happens now?
When you sold those shares short (seller shortage), there was someone on the other side who bought them. That buyer expects delivery. Since you can't deliver, your broker will try to purchase those shares in a buy-in auction conducted by the clearing corporation.
India now runs on T+1 settlement (since January 2023), so things move fast. On T+1 (settlement day), the clearing corporation accepts pay-in and identifies shortages. You get debited a valuation debit, an amount equal to the undelivered shares valued at the closing price on the trading day preceding pay-in. The auction to source those shares happens on T+2, after pay-out is completed. Here T is the day you traded. Weekends and holidays don't count.
If the auction is successful, you (the defaulting client) will have to pay the auction price + brokerage + penalty. If the auction price is higher than the valuation price, you pay the difference on top. The clearing corporation (NSCCL for NSE, ICCL for BSE) also levies its own charges, and your broker may add their own penalty on top of that.
What will the auction price be?
That depends on the price of the stock on auction day. If the auction price is lower than what you sold at, you might think you'd pocket the difference. But no, that usually goes to the Investor Protection Fund. Some brokers do pass the gain to you, but don't count on it.
If the auction price is higher than your sell price, you pay the difference. Your broker will send you an email with the full breakdown.
What if the auction fails?
If no one is willing to sell in the auction (this generally happens when the stock hits upper circuit), the shortage is deemed closed out. The buyer doesn't get shares, they get cash instead.
The close-out price is the higher of: the highest price prevailing on NSE from the day of trading till the auction day, or 20% above the official closing price on the auction day, whichever is higher. So if the stock ran up after you short sold it, this can get expensive quickly.
For illiquid stocks that barely trade, auction failures are more common, and you can end up paying well above what the stock was trading at when you sold.
Short deliveries and internal shortages
Short delivery is what we've been talking about: you sold shares you didn't have and failed to cover. This could happen because you forgot to square off your intraday position, or because you accidentally bought on BSE while your sell was on NSE (cross-exchange mismatch, and yes, this happens more than you'd think).
Internal shortage is when both the buyer and seller are clients of the same broker. In this case, the broker is supposed to try resolving it internally first, using their own inventory or borrowing shares through the SLB (Securities Lending and Borrowing) mechanism. If the broker can't sort it out, it goes to the exchange-level auction like any other shortage. SEBI has been fairly strict about this. Brokers can't pocket the close-out benefits, they have to pass them to the affected buyer.
Valuation debit: how your account gets debited
When the shortage is identified on settlement day (T+1), the clearing corporation immediately debits you at the valuation price, which is the closing price of the stock on the trading day preceding pay-in. This is the valuation debit.
If the stock is then bought in auction on T+2 and the auction price is higher than the valuation price, you pay the difference on top. If the auction fails entirely, the close-out formula kicks in (highest price from trade day to auction day, or 20% above closing on auction day, whichever is higher).
Can you short sell on a delivery basis?
Yes, and this is a very common misconception. A lot of people think short selling is only allowed intraday. SEBI actually permits short selling on a delivery basis too, for both retail and institutional investors. The catch is that naked short selling is not allowed. If you want to short sell for delivery, you need to borrow the shares through the SLB mechanism so you can actually deliver them.
Institutional investors (FIIs, mutual funds) must declare upfront at order placement that it's a short sale. Retail investors have until the end of trading hours on the transaction day to make that disclosure. Your broker's platform will have a checkbox or flag for this.
That said, in practice most retail short selling is intraday. You sell in the morning, buy back before 3:30 PM, and no delivery obligation arises. Delivery-based short selling via SLB is mostly an institutional thing.
Frequently asked questions
Can a retail investor participate in the auction?
No. Only clearing members (your broker) can participate. It's a separate trading session that retail investors don't have access to. You can, however, lend your shares through the SLB market and earn a fee. Borrowers might use those shares to cover auction obligations.
Is short selling only allowed on an intraday basis?
No. SEBI allows short selling on a delivery basis too, for both retail and institutional investors. But naked short selling is not allowed. If you want to short sell for delivery, you need to borrow shares through the Securities Lending and Borrowing (SLB) mechanism.
What about Trade-to-Trade (T2T) stocks?
T2T stocks don't allow intraday trading at all. Every trade must result in delivery. Penalties for short delivery in this segment are stricter, and close-out rates tend to be higher.
What is SEBI's T+0 instant settlement?
SEBI started a pilot for same-day (T+0) settlement in March 2024 for a small set of stocks. Under T+0, there's basically no room for short delivery since everything settles the same day. It's still a pilot and not the default for most stocks.
Will my broker notify me about a short delivery?
Yes. Your broker will email you with details of the short delivery, the auction outcome, and what was debited from your account.
What happens if I short sell on NSE but buy back on BSE?
That counts as a short delivery on NSE since the buy and sell are on different exchanges. The settlement systems are separate. You'll go through the auction process on NSE. This cross-exchange mismatch is more common than people think.
Can my broker charge extra fees on top of the auction penalty?
Yes. On top of the clearing corporation's penalty and the auction price differential, your broker can charge their own brokerage on the auction transaction and an additional penalty. These charges vary by broker, so check your broker's tariff sheet.
What is the difference between close-out and auction?
An auction is when the clearing corporation tries to buy the shares from willing sellers in a separate trading session. A close-out happens when the auction fails (no sellers). The exchange settles the trade in cash instead of shares. The close-out price is the higher of: the highest traded price from trade day to auction day, or 20% above the closing price on auction day.
Penalty rates, close-out percentages, and auction timings can change. SEBI and the clearing corporations update these through circulars. Always verify the latest rules with your broker or on the NSE Clearing website.
Last updated: April 2026