After Market Order (AMO) in India: Timings, Fills and Taxes

What an After Market Order Really Is

An After Market Order (AMO) is an order you submit when the exchange is closed. The NSE and BSE run regular trading from 9:15 AM to 3:30 PM IST. Outside those hours the matching engine is off, so nothing can actually trade. Your broker simply stores your AMO in its own system overnight and then pushes it to the exchange the moment the exchange starts accepting orders the next morning.

This is the single most misunderstood point about AMOs. An AMO is not a special order type at the exchange. It is a convenience feature at the broker level. When the broker releases it, it becomes an ordinary limit or market order standing in the queue with everyone else. From that moment it follows the exact same rules as any order you place live during the day.

Because of this, an AMO carries no priority, no guaranteed price and no special protection. If a hundred other traders placed buy AMOs on the same stock, you are all in the same queue. Whether you get filled, and at what price, depends entirely on what the live market does at the open, not on what the stock closed at the previous evening.

The Real AMO Timing Windows in India

After the 3:30 PM close, the NSE runs a short post close session from 3:40 PM to 4:00 PM where equity delivery orders can be placed at the closing price. Separately, brokers open their AMO window so you can queue orders for the next day. Across most large Indian brokers the AMO window opens at roughly 3:45 PM and stays open through the night, closing only a few minutes before the next session begins, usually around 8:57 AM to 9:00 AM.

The exact cut off times are set by each broker, not by SEBI or the exchange, so they vary. Below are representative windows you will commonly see. Treat them as illustrative and verify the live timings inside your own broker app before you rely on them.

Notice the gap between 9:08 AM and 9:15 AM. The pre open session ends at 9:08 AM, a short buffer runs, and continuous trading starts at 9:15 AM. Equity AMOs typically take part in the pre open auction. F and O AMOs usually do not, because derivatives do not have a pre open auction in the same way, so those orders go live at 9:15 AM when the F and O segment opens.

How an AMO Actually Gets Filled

When your broker releases the AMO, one of two things happens depending on the order type you chose. Understanding the difference is the whole game.

• Market AMO: The order is sent in with no price limit. In the pre open auction it helps set the opening price and is matched at that discovered equilibrium price. If it spills into the normal session it grabs the best available price. You give up price control to gain certainty of execution.
• Limit AMO: You set a maximum buy price or minimum sell price. It will only match if the market trades at or better than your limit. You gain price control but lose certainty. On a strong gap the stock can blow past your limit and leave you unfilled.
• Stop loss AMO: Some brokers let you queue an SL or SL-M AMO. It only activates once the trigger price is hit during live trading, then behaves like a normal stop order.

The pre open session matters because that is where the opening price is discovered. From 9:00 AM to 9:08 AM the exchange collects all buy and sell interest, including released equity AMOs, and computes a single equilibrium opening price that maximises matched volume. So your equity market AMO does influence the open and gets the open price. But your limit AMO is not guaranteed that price. It only fills if the discovered price respects your limit.

A Worked Example with Reliance Shares

Say Reliance Industries closes on a Monday at Rs 1,420. After hours, strong global cues come through and you decide to buy 50 shares for delivery. You place a limit AMO to buy 50 at Rs 1,420 at around 7:00 PM. Here is how Tuesday can play out. All numbers are illustrative.

This table destroys the open price myth. Your limit AMO at Rs 1,420 does NOT get you Rs 1,420 just because that was the close. On a gap up to Rs 1,460 you are simply left out. Had you instead placed a market AMO, you would have been filled at roughly the Rs 1,460 open, paying Rs 40 per share more than you hoped, which is Rs 2,000 extra on 50 shares. That is the trade off: certainty versus price.

Costs and Taxes on an AMO Fill

An AMO is charged exactly like a normal order once it fills. There is no separate AMO fee at most discount brokers, but the usual statutory costs apply. Take the Reliance example filled at Rs 1,420 for 50 shares as delivery, a turnover of Rs 71,000. The main charges, all illustrative and rounded, would look roughly like this.

On the tax side, if you hold those Reliance shares and sell within 12 months, the profit is a short term capital gain taxed at 20 percent. Hold beyond 12 months and it is a long term capital gain taxed at 12.5 percent on gains above the Rs 1.25 lakh yearly exemption. These equity rates follow the rules effective from 23 July 2024. If instead you used AMOs in F and O, those profits are treated as business income and taxed at your slab rate, not as capital gains.

Using AMOs in Futures and Options

Many brokers allow AMOs in F and O, but the mechanics differ from equity. Derivatives do not run the same pre open auction, so a released F and O AMO goes live at 9:15 AM when the segment opens. There is no opening auction price to lean on, which means a market AMO on an option or future can fill at a sharply gapped price, especially on expiry days or after big overnight news.

Consider a Nifty weekly option position. Nifty options have a lot size of 65. Suppose the Nifty 24,000 call closed at a premium of Rs 120 on Wednesday evening and you place a market AMO to buy 1 lot for Thursday. If global cues are strong and Nifty gaps up, that call might open near Rs 180. Your market AMO fills around Rs 180, costing 75 times Rs 180, which is Rs 13,500, versus the Rs 9,000 you might have expected at Rs 120. That is Rs 4,500 more, purely from the gap. A limit AMO at Rs 120 would simply not fill in that case.

• Standard index lot sizes to keep in mind: Nifty 75, Bank Nifty 15, FinNifty 25, Midcap Nifty 50, Sensex 10, Bankex 15.
• Weekly expiries settle on their fixed weekly day and monthly expiries on the last expiry day of the month. An AMO placed the night before expiry can fill into a very fast, gappy open.
• Premiums move much faster in percentage terms than the underlying, so a small index gap can be a large premium gap. Prefer limit AMOs in options unless you truly want any fill.

AMO Versus a Regular Market Order

The table below corrects the common but wrong description that an AMO executes at market open. It executes when the broker releases it into the next session, which is not the same as being guaranteed the open price.

When an AMO Genuinely Helps

AMOs are most useful when you have done your analysis after hours and want to act at the open without waking up early or watching the screen. A salaried trader who studies charts at night, or an investor reacting to a US market close or an overnight earnings result, can queue a planned entry or exit and walk away.

• You analysed a stock after the close and want a disciplined entry the next morning without emotional last second decisions.
• Strong global cues or company news landed overnight and you want your order in the queue before the pre open rush.
• You cannot watch the 9:15 AM open due to work and want a pre planned, rules based order in place.
• You want to exit a position at the open and are willing to accept the discovered open price using a market AMO.

Mistakes That Cost Traders Money

The errors below come up again and again. Most of them trace back to the same false belief that an AMO is safe and fills at the close.

• Assuming a limit AMO will get the previous close. On a gap it will not. You either get a better price, a worse market fill, or no fill at all.
• Using a market AMO before a volatile event. You can be filled far from where you expected, especially in options near expiry.
• Forgetting to cancel a stale AMO. It can fire into a market that has moved against your original plan and book an unwanted position.
• Ignoring margin. If your account does not have enough margin when the AMO is released, the broker can reject it and you miss the trade entirely.
• Not checking your broker exact AMO window. If you place it after the cut off, it simply will not be queued for the next day.

Rules, Regulation and Broker Differences

The overall framework, including trading hours, the pre open session and STT, sits under SEBI and the exchanges. The AMO facility itself, however, is a broker level feature. SEBI does not mandate a fixed AMO window, so each broker decides its own opening and cut off times, which products it allows AMOs for, and whether it charges anything. This is why two traders on different platforms can have different AMO experiences for the same stock.

Always confirm three things in your own broker documentation before relying on AMOs: the exact open and close times of the window, whether AMOs are allowed in the segment you want, equity, F and O or commodities, and the margin requirement at the time the order is released. Rules and rates change, so verify on the official source before you trade.

For authoritative data and current rules, refer to NSE India, SEBI and Zerodha Varsity. Always confirm current rules, rates and contract specifications on the official source before you trade. The numeric examples here are illustrative and are not a promise of any return.

Sources and Further Reading

For authoritative data and further reading on this topic, refer to NSE India, SEBI (Securities and Exchange Board of India) and Zerodha Varsity. Always confirm current rules, rates and contract specifications on the official source before you trade.