Short answer

You must add funds to your account by 11:59 PM on the same day if there is a margin shortfall in your account to avoid the following:

Margin penalty: The exchange may charge a margin penalty for the shortfall in the margin requirement.

Increase in margin for additional positions: Margin requirements for additional positions could be increased if the account has a negative balance or margin shortfall.

Squaring off of positions: Open positions can be squared off to reduce margin requirements.

F&O brokerage on Arrow follows the Tariff Sheet (₹20 per options order; futures ₹20 or 0.03%, whichever is lower). Delayed payment charges may apply separately if dues remain unpaid — see your contract note and brokerage charges.