F&O Ban Period: The New Delta-Based Rules You Need to Know

F&O
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Heads up – December 8th changed everything.

The Ban Just Got Smarter

You know how it works: when a stock hits the F&O ban, you’re stuck. You can’t build fresh positions. But here’s what’s different now.

Earlier, exchanges counted lots. Simple math. Now they’re tracking delta-based open interest. They call it Future Equivalent OI, but really, it’s just measuring your actual skin in the game.

What Delta Really Means

Delta tells you how much money you make or lose when the underlying moves by ₹1.

Long a future? That’s +1 delta. You’re 100% exposed to every rupee the stock moves. Short a future? That’s –1. You profit when it falls.

Options are trickier. A deep ITM call might have a delta of 0.9, meaning it moves almost like a future. An OTM call sitting at 0.2 delta? It’s barely responding to price changes. Puts work the same way but in reverse.

If you want the full breakdown, hit up Varsity. But for now, just know: delta is your real exposure number.

Here’s How They Catch You

When a stock enters the ban on Day 1, exchanges snapshot your delta OI. Let’s say you’re holding +5 delta OI across your positions. That’s your base.

From Day 2, they check your delta every evening. If it’s higher than +5, you’re in trouble. Lower than +5 or exactly +5? You’re good.

Now here’s the catch: if the market rallies and your call options gain delta naturally, they don’t care. That’s passive. But if you add a fresh position that pushes your delta higher, even by 0.1? That’s a violation.

What You Can Do

You can square off positions. You can reduce your delta. You can even add hedges that bring your overall delta down.

Let’s say you’re long a future (+1 delta) and you’re worried. You buy an ATM put, maybe –0.5 delta. Your net drops to +0.5. Perfectly legal. Actually, it’s smart risk management.

What Gets You Penalized

Adding to your position. Buying more futures or calls when you’re already long. Selling more futures or buying puts when you’re already short. Flipping your position from short to long or vice versa, even if the absolute number looks smaller, the sign change is a red flag.

Basically, anything that increases your end-of-day delta beyond the base.

Let’s Walk Through Some Scenarios

Scenario 1: You’re long one lot of calls, delta +0.30 on Day 1. Market rips higher. By Day 2, your delta is +0.50 just from price movement. You didn’t trade. No violation.

Scenario 2: Day 1, you’re long a future, +1 delta. Day 2, you’re getting nervous, so you buy a put for protection, delta –0.4. Your net is now +0.6. Reduced your exposure. No violation.

Scenario 3: Day 1, long one future, +1 delta. Day 2, you’re bullish and add another lot. Delta doubles. Clear violation.

Scenario 4: Day 1, you’re short with –1 delta. Day 2, after some trades, you end up at +2 delta. You’ve completely reversed. That’s not reducing, that’s building fresh exposure. Violation.

The Penalty Hurts

Exchange charges you 1% of the violation value. That’s the extra delta you’re carrying times the stock price.

But here’s the kicker: the minimum penalty is ₹5,000 per day. Maximum is ₹1,00,000. Add 18% GST on top.

Real example: You’re holding a long future (+1) and a long put (–0.5) on Day 1. Base delta: +0.5. Next day, you exit the put thinking you’ll manage without it. Your delta shoots to +1. Violation delta: 0.5. Even if 1% of that value is just ₹800, you’re paying the minimum ₹5,000 plus ₹900 GST. Total: ₹5,900.

Worse? This repeats every single day until you fix it or the stock exits the ban. Your base doesn’t change. Day 3, Day 4, Day 5, same penalty, every day, until you bring that delta back down.

What This Means for Your Trading

Stop thinking in lots. Start thinking in delta. That’s what the exchange is watching now.

During a ban, your only job is to reduce or maintain. Don’t try to be clever. Don’t add “just one more lot” thinking you’ll get away with it. The system will catch you, and it’ll cost you ₹5,900 minimum every day.

If you’re already in a position when the ban hits, stay calm. Natural delta movement from market action won’t hurt you. But don’t touch that order window unless you’re reducing risk.

Check your delta on Sensibull before you make any moves. Know your base. Know where you stand.

Bottom Line

The new system is actually fairer. It measures real risk, not just lot counts. But it’s also stricter. There’s no hiding behind “I only added one small lot.” If your delta goes up, you pay.

So during a ban: reduce, hedge, or sit tight. That’s it. Those are your three options.

Trade smart. Know your numbers. And if you’re not sure what your delta is, pause and figure it out; here is the circular.

30 Likes
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Would I be given a nudge in Kite, when this happens?

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Yes, only once stock enters BAN

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Yes, we will nudge

yup…

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How will you be able to add a fresh position for a stock that is in ban period?

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New rule allow you to take.

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??

How did you conclude that? Please share the circular with exact line that explicitly allows you to take fresh F&O positions for stocks in ban period. That makes no sense and beats the literal meaning of the phrase - “ban period”. I am still not getting this …

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In very simple terms, you are holding 1 lot of long future, delta is 1, stock entered ban, new rule says one can trade to reduce delta without a sign change.
So, in this case your base delta is 1, so you are allowed to buy put or sell call which will reduce your delta with out a sign change. Read this for clear understanding.

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Ok. That is not the same as taking fresh position - but yea, I get the gist - even if a stock is in ban period - you can take any action that overall results in reducing your delta exposure and doesn’t flip the sign.

Can you please give further clarification on the following practical scenarios -

  1. What happens during rollover? Same delta and side allowed in ban period rollover? What if you have a hedged (FUTURE + OPTION) position to begin with when the stock goes in ban period? Rolling over only the FUTURE will result in increasing delta. Isn’t it?
  2. The zerodha support document talks about base position which is making note of delta when the stock goes in ban period. Later if I reduce my delta and after few days (if the stock is still in the same ban period) - can I increase my delta to the point I had delta when the stock went into ban period - without penalty?
  3. Does the base position delta ever get updated or it is the delta on the first day of the ban period and remains the same throughout the ban period?
  4. The sign flip is really dangerous. Let’s say you are in ban period and you make yourself delta neutral. And then the sign flips - very much possible with options. How will you operationally figure out that this is due to market movement or taking position. What part of delta will be attributed to each bucket?
  5. How is this penalty visible in Zerodha. What exact line will be shown in ledger? And when will this be visible. Same day / 10 days later (like short margin penalty) / End of ban period?

Also, I suppose you will have nudge/email for it - but seeing at the penalty structure (per day) - you can give traders an option to revert to old behaviour rather than allowing this that would surely result in incessant penalties.

Thanks.

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If you roll over only the Future (and not the Option), or if the new Future has a significantly different impact that raises your net FutEq OI above the Base Position calculated for that day, it constitutes a violation. make sure do it within the limits of your delta oi.

If you reduce your delta/positions on Day 2, your Base Position for Day 3 is reset to this lower level. You cannot subsequently increase your positions back to the levels held on Day 1. Any increase from the new, lower Base Position is a violation

The Base Position Delta is not static; it is updated daily throughout the ban period. While the specific contract quantities you held when the stock entered the ban (Day 1) are stored as your fixed Base Position, the Delta value used to calculate their Future Equivalent (FutEq) limit is refreshed every day using the parameters from that specific day’s 2 PM SPAN file. This means that for each day the stock remains in the ban, the system applies the current day’s 2 PM Delta to your original Day 1 holdings to determine your allowable limit, ensuring that passive changes in Open Interest caused solely by market movements (which naturally shift the Delta) are accounted for and do not trigger a violation.

A violation occurs if the FutEq OI of your current EOD position is greater than the Base Position (in absolute terms) or if there is a change in sign relative to the Base Position that is not accounted for by the passive delta update. Effectively, if you trade to make yourself delta neutral or flip the sign intentionally while in a ban, and the result differs from the passive Base trajectory, it is a violation

We will post a separate penalty entry on the same day.

9 Likes
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Thank you for reverting. Its more clear now.

Regarding the following -

The fixed Base Position has EoD Delta or 2 PM SPAN file Delta and is it from the no-ban day or 1st ban day? For example -

Day 0 2:00 PM : No Ban. DIXON ~ 12000. DIXON 12000 ATM PE SHORT 2 LOT. Delta Abs = 100 * 12000 * 0.5 = 600000
Day 0 3:30 PM : No Ban. DIXON ~ 12000. DIXON 12000 ATM PE SHORT 4 LOT. Delta Abs = 200 * 12000 * 0.5 = 1200000
Day 1 2:00 PM : Ban Period. DIXON ~ 12000. DIXON 12000 ATM PE SHORT 3 LOT. Delta Abs = 150 * 12000 * 0.5 = 900000
Day 1 3:30 PM : Ban Period. DIXON ~ 12000. DIXON 12000 ATM PE SHORT 1 LOT. Delta Abs = 50 * 12000 * 0.5 = 300000

What will be the base delta abs for DIXON?

Also, unlike other penalties (which after months of back and forth had all moved to EoD/BoD next day basis), this has again introduced the intraday penalty regime with its 2PM span file.

P.S. You have got to send an email to every zerodha client who has a position in a stock in ban period with their base delta snapshot and on successive days with FutEq snapshot until the ban period ends or the position is exited. That is the only way … Isn’t it?

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The day the stock enters the ban period is considered ‘Day Zero’. The base position is established using the end-of-day (EOD) data from that day. Therefore, the EOD Delta/Open Interest recorded on Day Zero becomes your fixed base limit (from here reducing delta and passive changes are allowed)

1200000

It is the client’s responsibility to track the ban list and manage their own positions. We do not send daily snapshot emails. However, in the event of a violation, we will alert you and attempt to liquidate the excess position to help you avoid exchange penalties

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@Adarsh_Patil If a stock is in a ban period, how will we know what my base delta will be?

Also, will we receive an email from Zerodha regarding the base delta of a position when a stock enters a ban period?

I got email from Zerodha about my position is in ban period and Zerodha may square off my position. But if anyone is ready to take penalty still why Zerodha will square off my position?

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You can check your base delta using Sensibull when a stock enters the ban period and take note of it.
You will receive a precautionary email from our end if you are holding positions in ban stocks. We are also planning to send an email with the exact delta OI details; this will take some time.

We do not touch your position unless you violate the delta OI rules. If there is a violation, the exchange may come back asking for an explanation for allowing you to hold the same position. There is also a risk of your account going into debit due to penalties.

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Okay but If stock enter in ban period let suppose I miss to check delta on first day then how will I get to my base delta on 2nd day??

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If you miss the check on day one, you can review it on day two, provided you hold the same position. Alternatively, you can download the exchange SPAN file to review the delta details and calculate them based on your position. Once we begin the email process, you may refer to that for delta OI details.

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Any ETA by when email notifications will start

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We’ll update you here once it goes live. We’re currently building a new process around this, as it’s fairly new for the industry, so it may take a little time. No ETA

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Here’s a Varsity video by Karthik Rangappa that walks through this.

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Please help me on this,
I normally trade in options and that are 40 to rs 50 difference below 1000 rs stocks and 200 rs difference to spot on above 1000.
Lets take the example of irctc on Dec 25th.
I bought first rs 720 ce at 0.55 , 5 lots, i had the confidence that it will still go up and bought 800 ce at 0.2, with little money left and exited 720 at 4.55.
Bought 830 ce again at 0.1, 10 lots, just to try the luck further.
In case of delta oi , will the penality comes to the picture once the stock gets in to banned at Eod,
Or at any point duirng the day, so that i should trade cautious.
I normally take a look at ban period sticks on nse and never adds position. Either long or short.
And i generally trade like above, because of fomo.
Will the above trading secsnrios will attract penality? Even though i dont add any new postions after stock enters ban.