Margin and Leverage: The Double-Edged Sword of Derivatives

Leverage means controlling an exposure larger than the money you have put up. In the derivatives market, it comes from margin: instead of paying the full value of a futures contract or a sold option, a trader deposits a fraction of it as security. Leverage is what makes derivatives useful for hedging, because a fund can adjust a large exposure with a small amount of capital. It is also the main reason derivatives losses can be fast and large.

How margin creates leverage

Suppose a contract represents ₹15 lakh of exposure and the margin required to hold it is ₹2 lakh. These are illustrative round numbers, not current specifications. The trader controls ₹15 lakh with ₹2 lakh, about 7.5 times leverage. Now consider what different price moves in the underlying do to that ₹2 lakh:

• A 1% move changes the position's value by about ₹15,000 — 7.5% of the margin.
• A 3% move changes it by about ₹45,000 — 22.5% of the margin.
• A 10% move changes it by about ₹1.5 lakh — three-quarters of the margin.

An investor who bought ₹2 lakh of shares outright and saw a 10% fall would lose ₹20,000. A trader with ₹2 lakh of margin on a ₹15 lakh futures position would lose about ₹1.5 lakh on the same move. The market moved the same amount; the leverage changed the outcome.

A week on a leveraged position

Here is how a run of ordinary days can play out on that illustrative position — ₹15 lakh of exposure held with ₹2 lakh of margin. On Monday the underlying falls 1.2%: about ₹18,000 is debited, leaving ₹1.82 lakh. On Tuesday it falls another 1.5%: about ₹22,500 more is debited, leaving roughly ₹1.6 lakh. The account may now be below the level the broker requires, and a margin call arrives. The trader either adds money or reduces the position.

Suppose the trader adds funds and holds on. On Wednesday the market rises 0.8%, recovering about ₹12,000. On Thursday it falls 2%, a move that happens a few times in a typical year, and roughly ₹30,000 goes. Over four days the index has fallen by about 4% in total — unremarkable for a stock investor — while the trader has lost close to ₹60,000, nearly a third of the original margin, and has had to put in extra cash along the way. None of these moves was extreme. The leverage is what turned them into a serious loss.

Types of margin

In India, the clearing corporations of the exchanges set margin requirements for each derivatives contract, based on models of how much the price could move in a short period. Brokers collect these margins from clients and may add their own buffer on top.

• Initial margin: the amount required to open a position, designed to cover likely losses over a short period. It typically rises when markets are more volatile.
• Mark-to-market (MTM) settlement: gains and losses are settled in cash every day. A loss is debited from your account; a gain is credited.
• Additional margins: exchanges can impose extra margin on particular contracts or days, for example on expiry day for short options under SEBI's October 2024 measures.

Margin calls and forced closure

If losses reduce the money in your account below what is required to keep a position open, your broker will ask you to add funds — a margin call. If the money does not arrive in time, the broker can close your position. This can happen during market hours without further notice, and the position will be closed at whatever price is available then, which may be the worst point of a sharp move. In fast-moving markets, the loss can exceed the money in the account, leaving a debit balance that the client still owes.

Margin requirements can also change while you hold a position. Exchanges can raise margins when volatility jumps, which can force traders to add money or reduce positions at exactly the moment markets are most stressed.

Upfront margin rules in India

SEBI has, over recent years, tightened rules so that margins must be collected upfront rather than later in the day, and brokers face penalties for short collection. Its October 2024 measures for index derivatives also required upfront collection of option premium from buyers. The broad direction of these changes has been to reduce the extra, informal leverage that was previously available to traders. Specific rules continue to evolve, so check SEBI circulars and your broker's current policy.

Leverage outside derivatives

Leverage is not limited to futures and options. Margin trading facilities let investors buy shares in the cash market with partly borrowed money, paying interest on the borrowed portion. The same arithmetic applies: borrowing magnifies both gains and losses on the money you put in, and adds an interest cost that has to be overcome before a trade breaks even.

Why leverage changes how risk feels

On a leveraged position, ordinary daily moves become large swings in your account. A 1% move in an index, which is common, can be a 7–8% move in a trader's margin. That changes behaviour. Traders under pressure are more likely to abandon a plan, hold losing positions hoping for a recovery, or take bigger positions to win back losses. SEBI's September 2024 study found that 93% of individual traders in equity F&O incurred losses between FY22 and FY24, a reminder that the mechanics described here translate into real outcomes for most participants.

Principles professionals use

• Size positions by the loss you can absorb, not by the margin you can afford. If a 5% move against you would cause serious harm, the position is too large.
• Keep cash in reserve beyond the minimum margin, so a volatile day does not trigger forced closure.
• Decide in advance where you will exit if wrong, and stick to it.
• Count all costs: brokerage, exchange charges, taxes, and the bid-ask spread add up quickly for frequent traders.
• Understand settlement: stock derivatives in India are physically settled, which can require full payment or delivery if held to expiry.

The bottom line

Leverage does not change whether a market goes up or down. It changes how much each move matters to you. For hedgers, that is the point. For individual traders, it means the same small edge or small mistake is multiplied many times — which is why understanding margin is not optional before using derivatives.