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Chapter 4

Buying calls (long call)

The simplest bullish trade in options. Pay a small premium, and if the underlying rises, your profit can multiply many times over. If it doesn't, you lose only what you paid. Simple — but not easy to profit from consistently.

📖 9 min read 🇮🇳 Nifty

The idea

You think Nifty is going up. You could buy the index (via a Nifty ETF or futures). Or you could buy a call option — which gives you similar upside with much less capital at risk.

A worked example

Example

Nifty 25,000 weekly call

Nifty is at ₹25,000. You expect it to rally 300+ points by Tuesday. You buy 1 Nifty 25,000 CALL for ₹150 premium.

  • Cost = ₹150 × 25 = ₹3,750
  • Break-even = 25,000 + 150 = 25,150 at expiry

At Tuesday close:

Nifty at 25,500: Call worth 500. Payoff = 500 × 25 = ₹12,500. Profit = ₹8,750 = +233%.

Nifty at 25,200: Call worth 200. Payoff = ₹5,000. Profit = ₹1,250 = +33%.

Nifty at 25,100: Call worth 100 (below break-even). Loss = ₹1,250.

Nifty at 24,800: Call worthless. Loss = ₹3,750 (full premium).

Why buying calls is seductive — and dangerous

Upside: Unlimited profit potential, capped loss. Small capital → big potential returns.

Downside: Most calls expire worthless. Time decay works against you every day. Even if the underlying goes up, if it doesn’t go up fast enough, you lose.

⚠️ The three things must ALL happen

For a bought call to profit, you need to be right about:

  1. Direction (it must go up)
  2. Magnitude (enough to cover premium)
  3. Timing (before expiry)

Get one wrong and you lose. This is why casual “let me buy a call for lottery money” trades almost always lose over time.

The math

Long call formulas

Break-even (at expiry) = Strike + Premium

Maximum loss = Premium paid × Lot size

Maximum profit = Unlimited (theoretically)

Return if profitable at expiry = (Spot − Strike − Premium) × Lot size

Choosing the strike: ITM, ATM, or OTM

StrikePremiumDeltaBest when
ITM (below spot)Highest~0.7–0.9High conviction, want stock-like exposure with capital efficiency
ATM (at spot)Moderate~0.5Balanced bet on direction + volatility
OTM (above spot)Cheapest~0.1–0.3Lottery-ticket play; needs big move to profit

Delta measures how much the call’s price moves per ₹1 move in Nifty. An ATM call at delta 0.5 gains ₹0.50 per ₹1 rise in Nifty. Deep OTM calls have tiny delta — they barely move until close to strike.

The two moments to buy calls

Long calls make sense in specific situations:

1. Bullish event catalyst: Earnings, budget, RBI policy, election result. Buy a call to capture upside with defined risk. Expect implied volatility to be pumped up already — you’re paying for it.

2. Portfolio hedge, upside version: You’re heavily short (or in cash) but worried about a rally. Buy a call to cap your regret if the market rockets. Cheap insurance against being left behind.

The three ways buying calls kills your account

  1. The slow bleed — buy weekly OTM Nifty calls every Monday, most expire worthless. Steady losses eating your capital.
  2. The averaged-down disaster — the call is down 40%, you “double down” and buy more. Now down 60%. Repeat.
  3. The “sure thing” trade — bet a big % of capital on one event, wrong, blown up.
⚠️ Rule to remember

Never risk more than 2-5% of your account on any single long option trade. If a “sure thing” needs more than that, it’s not a sure thing.

When NOT to buy calls

Alternative: use a bull call spread instead

If a straight long call feels expensive (premium too high, or IV too rich), consider a bull call spread (Chapter 6). You buy a call and sell a higher-strike call to reduce cost, at the price of capping upside. Much better risk-adjusted trade for most directional bets.

Try it

Payoff calculator → “Long call” preset. Adjust the strike and premium; see how break-even and P&L shape change.