Margins on futures and options trades vary according to contract, position, volatility and the risk rules of the exchange. A trader can calculate margin on the entire spread rather than each individual leg when opening an option spread. This is where a F&O Margin Calculator comes in handy as it can help you estimate this requirement before placing an order.
What is an Option Spread?
Option spread is an option strategy where traders buy and sell a combination of options with different strike prices but the same expiration date to profit from the movement of a security’s price.
An option spread is a combination of two or more option positions on the same underlying security. A typical example is a bull call spread . That is, you buy a call option and sell another call option at a different strike price, usually with the same expiration date.
The option purchased can reduce some of the risk created by the option sold. Due to the interaction of the positions, the margin system takes into account the portfolio risk of the spread.
For margining of futures and options, NSE Clearing uses SPAN (Standard Portfolio Analysis of Risk). SPAN is a portfolio based system that takes the risk of the futures & options positions together.
Role of an F&O Margin Calculator
The F&O Margin Calculator calculates the amount of money required to open or maintain a derivatives position. It normally takes into account information such as exchange, contract, buy or sell side, quantity, expiry and strike price.
The calculator treats each leg of an option spread as an individual option. This can show the margin effect after the offsetting position is added. The estimate may include SPAN margin, exposure margin and any other applicable margin components.
This is useful because you have to post margin when selling an option but when buying an option you usually pay the premium. The legs as a recognised spread can impact final margin requirement ( risk profile ) .
How to Use the Calculator for an Option Spread
Step 1: Choose the relevant Exchange & F&O segment.
Step 2: Choose the underlying index or stock.
Step 3: Enter the first option leg. Select its expiry, strike price, call or put type, buy or sell action, and quantity.
Step 4: Repeat the same for the second leg.
Step 5: Note the margin quoted for the entire spread.
Step 6: Before you place your order, review the estimate one last time. Depending on the exchange rules, volatility, expiry conditions or risk measures of the position, margin requirements may vary.
These steps help traders to understand the impact of each leg on the funding requirement of the entire strategy.
Basic Example
Say a trader is looking at a two-leg call spread. The first leg is a longshot. The second leg is a short call at a different strike price.
If you buy a short call by itself, the calculator could show you the margin associated with the risk of that position. With the long call added, the calculator treats both positions as a spread.
The posted margin can then be proportional to the risk at the portfolio level recognised by the clearing system. The actual amount varies according to the contracts chosen and the margin parameters in place at the time.
Margin Is Not the Same as Brokerage
Traders should also know how to calculate brokerage as margin and trading charges are different.
An F&O Margin Calculator is all about the money needed for a position. Separate Broking Calculator may be required for Broking, Securities Transaction Tax, GST, exchange fees and any other applicable charges.
For example, Bajaj Broking has a F&O margin calculator that tells you SPAN, exposure and total margin. It has a broking calculator which calculates broking and transaction charges separately.
So, Bajaj Broking can be an option for traders who want to check margin requirements and expected trading costs thru calculation tools on the same broking platform.
Shortcomings of Margin Estimation
A margin calculator is only a guide. This figure may change if market conditions, exchange risk parameters, contract details or margin rules change.
The treatment of the related spread margin may also depend on whether the positions satisfy the conditions recognised by the clearing system. Traders should check the number around the time they are putting the order in.
Conclusion
The F&O Margin Calculator considers the legs of the spread as a portfolio and helps traders know the funds required for an option spread. Can display SPAN, exposure and total margin and the effect of an offsetting option position on the calculation.
If you want to check transaction costs also, it should be used along with broking calculator. This helps traders to understand margin requirements and charges related to trading clearly before placing a F&O order.
