Conceptual · Article 8.1.3

Stock Options — Calls.

Q: Can I buy a call option without owning the underlying shares?

Yes. Buying a call does not require you to hold the underlying shares — you pay the premium upfront and gain the right to buy at the strike on expiry. Most buyers never exercise; they exit the option itself by selling it back before expiry to bank a profit or cap a loss. Your maximum loss as a buyer is strictly the premium you paid.

Q: What happens if I forget to exit an in-the-money call option before expiry?

It is automatically exercised. Your account is debited the full contract value (strike price times lot size) and the actual shares are credited to your demat account. There is no Do Not Exercise opt-out for stock options — NSE withdrew the DNE facility in March 2023. Ensure sufficient funds, or square off before expiry. Many brokers force-square-off open ITM positions near expiry; verify your broker's policy.

Q: I sell covered calls on my long-term holdings. Does that change my capital gains on those shares?

No. The premium from writing covered calls is separate non-speculative business income taxed at your slab rate under Section 43(5)(d). It does not reduce your cost of acquisition and does not offset the capital gain when you eventually sell the shares. The option premium and the share gain are taxed entirely independently.

Q: What is the difference between buying an OTM call and buying a futures contract if I am bullish?

A long futures position gives unlimited gain if right and unlimited loss if wrong, with no premium — only margin. A long out-of-the-money call gives leveraged upside if the stock moves enough, but expires worthless (total premium loss) if it does not. Futures need ongoing margin management and have no time decay; options cost only the upfront premium but lose value every day through theta.

Q: Can I sell a call option without owning the underlying shares?

Yes — this is a naked call, the riskiest options position, because losses are theoretically unlimited if the stock rises sharply. Brokers demand very high margins for naked writing and many restrict it for retail clients who do not meet experience criteria. A covered call is different: you hold the underlying shares as protection against the delivery obligation.

Q: How does the Budget 2026 STT hike affect option buyers and sellers?

From 1 April 2026, STT on the sale of an option premium rises from 0.1% to 0.15% (a 50% rate increase) and STT on option exercise rises from 0.125% to 0.15%. Futures STT also jumps from 0.02% to 0.05%. For retail traders doing a handful of lots a month the incremental cost is modest, but for active writers and high-frequency strategies the cumulative annual drag is meaningful and should be built into return expectations.

The Right to Buy — and Why Most Buyers Still Lose.

Published as on 22 July 2026

A stock call option is a dated, defined-risk bet on a rising share price. For a fee called the premium, the buyer rents the right — but never the obligation — to buy a fixed lot of shares at a set strike price on expiry. Their worst case is fixed: the premium, and nothing more. On the other side, the writer pockets that premium but shoulders the mirror-image obligation to deliver the shares, posts margin, and carries a loss that is, in theory, unlimited. That asymmetry is the whole design. In India every stock option is European-style, auto-exercised if in-the-money, and physically settled — with no opt-out since 2023. And because a premium is part intrinsic value, part time value, time itself works against the buyer: theta erosion is the single most common reason retail option buyers end the month in the red.

Premium Paid

Buyer's Max Loss

European

Option Style

Physical

ITM Settlement

Slab Rate

Tax · Non-Spec Business

Executive Summary · Page 2

Executive Summary · 6 Findings

A call option is a small, dated bet on direction with a known worst case. For the price of a premium, the buyer rents the right to buy a stock at a fixed strike until expiry, risking only what they paid. The writer on the other side collects that premium but shoulders the mirror-image obligation, posting margin against a loss that is, in theory, unlimited. The asymmetry is the point — and the reason time, not just price, decides who wins.

Covers what a call option is and the buyer-versus-writer asymmetry; how a premium splits into intrinsic and time value; moneyness (ITM, ATM, OTM) and the Greeks — Delta, Theta, Vega, Gamma; European-style physical settlement, auto-exercise and the vanished DNE opt-out; monthly last-Tuesday expiry and the STT schedule with the Budget 2026 hike; the three core strategies — long call, covered call, bull call spread; non-speculative business-income taxation under Section 43(5)(d); and six questions Indian traders ask.

Key Findings

A right for the buyer, an obligation for the writer.

A call gives the buyer the right — not the obligation — to buy one lot at the strike on expiry, for a premium. The buyer's maximum loss is that premium; upside is unlimited. The writer receives the premium but must sell if assigned, caps their gain at the premium, and takes on theoretically unlimited risk — which is why only the writer posts margin.

Premium = intrinsic value + time value.

Intrinsic value is how much the option is already in profit — Max(0, Spot − Strike). Time value is what the market pays for the chance of a further move, driven by time to expiry and implied volatility. As expiry nears, time value bleeds away through theta; on the final day only intrinsic value remains.

European-style, auto-exercised, physically settled.

All Indian stock options can be exercised only at expiry, are automatically exercised if in-the-money at close, and settle in actual shares — not cash. There is no Do Not Exercise opt-out; NSE withdrew it in March 2023. Hold an ITM call to expiry and you must pay the full contract value and take delivery.

Monthly expiry, last Tuesday — and a rising STT.

Stock options trade monthly only (no weeklies), expiring the last Tuesday of the month since NSE's September 2025 shift from Thursday. STT is 0.1% on the sold premium and 0.125% on physical exercise — both rising to 0.15% from 1 April 2026 under Budget 2026, alongside a steep futures hike from 0.02% to 0.05%.

Three core strategies for three intents.

A long call is a defined-risk leveraged bullish bet. A covered call earns premium income on shares you already own, at the cost of capped upside and possible assignment. A bull call spread buys one strike and sells a higher one, cutting the premium outlay but capping the profit — a moderately bullish, cost-controlled position.

Taxed as business income — and time is the enemy.

Option gains are non-speculative business income under Section 43(5)(d), taxed at slab rate, reported on ITR-3, with set-off against any head except salary and an 8-year carry-forward; a Section 44AB audit may apply. And most buyers lose — theta erodes OTM premiums daily, so you can be right on direction yet still lose to the clock.

At A Glance

Feature	Value	Detail
Instrument	Stock Call	Right to buy
Buyer's max loss	Premium	Defined risk
Writer's max loss	Unlimited	Posts margin
Option style	European	Exercise at expiry
Settlement (ITM)	Physical	Actual delivery
Expiry	Last Tuesday	Monthly only
STT (premium/exercise)	0.1% / 0.125%	0.15% Apr 2026
Tax	Slab rate	Non-spec business

Exhibit 01: A Long Call at Expiry (₹1,300 call @ ₹25, lot 500)

Stock at Expiry	Call Value	Net P&L
₹1,300 or below	₹0	−₹12,500
₹1,325 (break-even)	₹12,500	₹0
₹1,380	₹40,000	+₹27,500
₹1,450	₹75,000	+₹62,500

Illustrative, FY 2025-26. Outlay = premium ₹25 × 500 = ₹12,500. Break-even = strike + premium = ₹1,325. Below the strike the option expires worthless and the entire ₹12,500 is lost — the buyer can be right that the stock rose (₹1,200 → ₹1,290) and still lose everything if it fails to clear the strike before time value decays to zero.

The Opening · Page 3

The Opening

A call option is a contract between two people who disagree about a stock. The buyer thinks it will rise and pays a premium to lock in the right to buy it later at today's chosen strike price. The seller — the writer — collects that premium and takes the opposite obligation: to hand over the shares at the strike if the buyer chooses to exercise. Nothing about the two positions is symmetric. The buyer can lose only the premium but gain without ceiling; the writer can gain only the premium but, on a naked position, lose without limit. That single imbalance explains almost everything about how calls behave — and why they are nothing like futures, where both sides face open-ended profit and loss.

"A long call buyer can be exactly right about direction and still lose every rupee. If the stock drifts up but does not clear the strike before expiry, time value decays to zero and the premium is gone. In options, being right is not enough — you have to be right in time."
Right on Direction, Wrong on the Clock

The mechanics. A premium is not a single number but a sum of two: intrinsic value — how far the option is already in the money — and time value, the market's price for the possibility of a further move. Buy a ₹1,100 call while the stock trades at ₹1,200 and ₹100 of the premium is intrinsic; anything above that is time value, and it evaporates a little every day. This is theta, and it is the buyer's constant headwind and the writer's steady tailwind.

The FY 2025-26 context. India's stock options are European-style and physically settled: an in-the-money call held to expiry is auto-exercised, and actual shares change hands — the buyer pays the full contract value and receives stock, the writer must deliver it. Since NSE withdrew the Do Not Exercise facility in March 2023, there is no opting out. And from 1 April 2026, Budget 2026 lifts STT on option premiums to 0.15% and on exercise to 0.15% — small per trade, but a real drag on high-frequency writing.

The Honest Boundary: A call option is NOT a lottery ticket, though far-OTM calls are often bought like one — and SEBI data shows the overwhelming majority of retail option buyers lose. It is NOT free leverage — you pay for time, and time decays. It is NOT a cash-settled instrument for stocks — an ITM call means real delivery and real funds. It IS a precise, defined-risk tool for a specific bullish view over a specific window, for someone who understands theta and the delivery mechanics.

Structure

Part I

What a Call Is, the Buyer–Writer Asymmetry & How Premiums Are Priced

Part II

Moneyness, the Greeks & Physical Delivery at Expiry

Part III

Strategies, Transaction Costs & Slab-Rate Taxation

Part IV

The Verdict: Defined Risk, Disciplined Use

Use If

✓ Defined-risk bullish view on a catalyst

✓ You understand and accept theta

✓ Income on shares you already hold

✓ You can manage delivery / margin

Do NOT Use If

✕ Buying far-OTM calls as lottery tickets

✕ You ignore time decay

✕ Writing naked with no risk plan

✕ You cannot meet an ITM delivery

Part I

What a Call Option Is, the Buyer–Writer Asymmetry, and How a Premium Is Priced

The right versus the obligation; why only the buyer's loss is capped and only the writer posts margin; and how every premium splits into intrinsic value — the profit already banked — and time value, the fee for the chance of a further move before expiry.

Part I · Page 4

Buyer vs Writer

	Buyer	Writer
Premium	Pays	Receives
Position	Right to buy	Obligation to sell
Max loss	Premium	Unlimited
Max gain	Unlimited	Premium
Margin	None	Required
View	Bullish	Neutral–bearish

This asymmetry of risk and reward is the defining feature of options — and the reason they behave nothing like futures, where both sides face open-ended profit and loss. The buyer accepts a certain small cost for an uncertain large payoff; the writer accepts a certain small payoff for an uncertain large cost.

How a Premium Is Priced

Premium = Intrinsic Value + Time Value

Intrinsic value = Max(0, Spot − Strike): a ₹1,100 call with the stock at ₹1,200 holds ₹100 of intrinsic value. Time value is everything above that — the market's charge for the chance of a further move, larger when more time remains and when implied volatility is high. It is why options bought just before earnings are dear: IV is already elevated.

Where the Value Comes From

Component	Driven by	Behaviour
Intrinsic	Spot − Strike	Moves with stock
Time value	Time + volatility	Decays to zero
Last day	Intrinsic only	Time value ≈ 0

On the final day before expiry a call's time value is effectively nil — only intrinsic value survives. This is why an OTM call, which is all time value, expires worthless unless the stock clears the strike in time. It is also why the writer, having collected time value upfront, watches it fall in their favour with each passing day.

The core lesson: a call buyer is paying for time and possibility, not just direction. If the stock does not move enough, or moves too slowly, the option can lose value even as the buyer's thesis proves broadly correct. The writer's edge is the reverse: they are paid to wait, and time is on their side — but a sudden, sharp move can hand them a loss far larger than the premium they banked.

Part II

Moneyness, the Greeks, and the Physical-Delivery Rule That Catches Retail Traders

Why ITM, ATM and OTM calls behave differently; how Delta, Theta, Vega and Gamma drive your P&L; and why an in-the-money stock call held to expiry means real shares, real funds and — since March 2023 — no way to opt out.

Part II · Page 6

Moneyness

Term	For a call	Character
ITM	Spot > Strike	Intrinsic + time value
ATM	Spot ≈ Strike	Max time value
OTM	Spot < Strike	All time value

ITM calls track the stock closely; ATM calls carry the most time value and are most sensitive to volatility; OTM calls are cheapest but expire worthless most often, needing a larger move to pay off. They are the "lottery tickets" retail buyers overpay for.

The Greeks That Move Your P&L

Delta & Gamma — Direction

Delta is how much the premium moves per ₹1 in the stock: near 1.0 deep ITM, ~0.5 ATM, near 0 far OTM. Gamma is how fast delta itself changes — high near expiry for ATM options, making positions whip around.

Theta & Vega — Time & Volatility

Theta is daily time-value erosion — accelerating in the final 2–3 weeks, against buyers, for writers. Vega is sensitivity to implied volatility: premiums swell before results and news even if the stock hasn't moved. Buyers are long Gamma and Vega, short Theta; writers are the opposite.

Physical Delivery at Expiry

Auto-Exercised, Physically Settled, No Opt-Out

An ITM stock call at expiry is exercised automatically — the buyer pays the full contract value (Strike × Lot) and receives shares; the writer must deliver them or face a costly auction. OTM calls simply expire worthless. NSE discontinued the Do Not Exercise facility in March 2023, so there is no opting out of an ITM stock option — unlike cash-settled index options.

The CTM Margin Escalator

Calls within 5% of spot are Close-to-Money and attract rising delivery margins as expiry nears: 10% at E-4, 25% at E-3, 45% at E-2, 70% at E-1. Most retail traders square off before this bites. Brokers often force-close ITM positions for clients lacking funds or shares — confirm your broker's policy.

The Delivery Margin Ladder

Days to expiry	Delivery margin added
E-4	10% of contract value
E-3	25% of contract value
E-2	45% of contract value
E-1	70% of contract value

Stock options are monthly only (no weeklies) and expire the last Tuesday of the month since NSE's September 2025 shift from Thursday. A December 2024 SEBI consultation paper proposing to convert ITM stock options into futures on E-1 remains a proposal — no final circular had been issued as of early 2026.

Part III

The Three Core Strategies, What They Cost, and How They Are Taxed

The long call, the covered call and the bull call spread — matched to conviction and risk appetite; the STT schedule and the Budget 2026 hike; and why every rupee of option gain is non-speculative business income at your slab rate, with set-off, carry-forward and possible audit.

Part III · Page 8

Three Core Strategies

Long Call — leveraged, defined-risk bullish.

Buy a call when you expect a meaningful rise before expiry. Max loss = premium; max gain = unlimited. Stock ₹1,200, buy a ₹1,300 OTM call at ₹25 (lot 500) for ₹12,500; break-even ₹1,325. The appeal is known downside — but the theta trap is real: if the stock stalls, time decay can sink the trade even when your direction is right.

Covered Call — income on shares you own.

Hold 500 shares at ₹1,200 and sell a ₹1,300 call for ₹25 (₹12,500 premium). Stay below ₹1,300 and you keep it as income; break above and your shares are called away at ₹1,300 — you keep the premium but forgo the upside beyond it. Be ready for assignment and physical delivery.

Bull Call Spread — cheaper, capped bullishness.

Buy a ₹1,200 call at ₹50, sell a ₹1,300 call at ₹20: net cost ₹30 (₹15,000 for a 500-lot), break-even ₹1,230, max profit ₹35,000 above ₹1,300. The sold leg funds part of the bought leg — lower outlay, but the upside is capped. Suited to a moderately bullish view.

STT: Current vs 1 April 2026

Leg	Now	Apr 2026
Premium (seller)	0.10%	0.15%
Exercise (buyer)	0.125%	0.15%
Futures (seller)	0.02%	0.05%

STT on premium applies to the seller; exercise STT falls on the buyer on full contract value. A ₹50 premium on a 500-lot is ₹25 STT; exercising a ₹1,000 strike on 500 shares (contract value ₹5,00,000) costs ₹625 — the "STT trap" that pushes traders to square off ITM rather than exercise. All STT is deductible as a business expense.

Taxation (FY 2025-26)

Non-Speculative Business Income — Slab Rate

Option gains — buyer or writer — are non-speculative business income under Section 43(5)(d), taxed at your slab rate (up to 30% plus 4% cess), not as capital gains. ITR-3 is mandatory; salaried traders cannot use ITR-1 or ITR-2. Covered-call premium is taxed here too, entirely separately from the shares' capital gains.

Set-Off, Carry-Forward & Audit

Losses set off against any head except salary, and carry forward 8 years against business income (timely ITR required). Turnover follows the ICAI 2022 Guidance Note — absolute value of favourable and unfavourable differences — and a Section 44AB tax audit may apply. STT, brokerage, exchange and stamp charges are all deductible.

Part IV

The Verdict

Defined risk for the buyer. Open-ended risk for the writer. Discipline for both.

Part IV: The Verdict · Page 10

30-Second Summary

A stock call option is the right — not the obligation — to buy one lot of shares at the strike on expiry, for a premium. The buyer's loss is capped at that premium; the writer's gain is capped at it while their risk is theoretically unlimited, which is why only the writer posts margin. A premium is intrinsic value plus time value, and time value decays through theta — so a buyer can be right on direction yet still lose to the clock. All Indian stock options are European-style, auto-exercised if ITM, and physically settled, with no DNE opt-out since March 2023.

Stock options are monthly only, expiring the last Tuesday since September 2025. STT is 0.1% on premium and 0.125% on exercise, both rising to 0.15% from 1 April 2026. Every gain is non-speculative business income under Section 43(5)(d), taxed at slab rate on ITR-3, with set-off (except salary), 8-year carry-forward and a possible 44AB audit. Use a long call for a defined-risk catalyst bet, a covered call for income on holdings, a bull call spread to cut cost — and never buy far-OTM calls as lottery tickets.

"An option answers two questions at once — which way, and how fast. Futures ask only the first. That extra dimension is the buyer's opportunity and their trap: pay for time, and time will bill you daily. The disciplined trader treats a call as a dated, sized, defined-risk position — never as a cheap ticket to a jackpot."
The Final Orientation

The Bottom Line: As a buyer, use a call only when you have a specific bullish view over a specific window, size it so the premium is money you can lose, and respect theta — exit or roll before time decay and expiry mechanics turn against you. As a writer, prefer covered calls on shares you already hold over naked writing, keep margin ready, and plan for assignment and physical delivery. Square off ITM stock calls rather than let them exercise, to sidestep the STT trap and delivery obligations. Above all, remember the base rate: most retail option buyers lose. Treat defined risk as a discipline, not a licence.

ADWIZR · July 2026

Decision Rules

Use Correctly As

✓ Defined-risk bet on a known catalyst

✓ Covered-call income on holdings

✓ A cost-capped bull call spread

✓ A sized, time-aware position

Misuse Destroys Value

✕ Far-OTM "lottery ticket" calls

✕ Ignoring theta and IV

✕ Naked writing with no plan

✕ Holding ITM into delivery unfunded

Three Misconceptions

What Traders Get Wrong

(1) "If I'm right on direction, I win." Not with theta — a stalled stock still decays your premium. (2) "ITM stock options settle in cash." No — they settle in shares, with real funds and no DNE opt-out. (3) "Writing calls is easy income." Naked writing carries unlimited risk and heavy margin; only covered calls are protected.

Calls vs Futures vs Index Options

Different Tools, Different Risk

Stock calls: buyer's loss capped at premium, physical settlement if ITM. Stock futures: unlimited loss both ways, no time decay, both sides margined. Index calls: cash-settled, so no exercise STT and no delivery. Match the tool to the job — and the risk you can bear.

Premium

Buyer max loss

Writer: unlimited

European

Option style

Physical if ITM

Slab

Tax rate

Non-spec business

Investor FAQ

Questions Indian Traders Ask

Six questions, answered directly.

Investor FAQ · Page 12

Frequently Asked Questions

Q1 Can I buy a call option without owning the underlying shares?

Yes. Buying a call does not require you to hold the underlying shares — you pay the premium upfront and gain the right to buy at the strike on expiry. Most buyers never exercise; they exit the option itself by selling it back before expiry to bank a profit or cap a loss. Your maximum loss as a buyer is strictly the premium you paid.

Q2 What happens if I forget to exit an ITM call before expiry?

It is automatically exercised. Your account is debited the full contract value (strike × lot size) and the actual shares are credited to your demat account. There is no Do Not Exercise opt-out for stock options — NSE withdrew the DNE facility in March 2023. Ensure sufficient funds, or square off before expiry. Many brokers force-square-off open ITM positions near expiry; verify your broker's policy.

Q3 I sell covered calls on my long-term holdings. Does that change my capital gains on those shares?

No. The premium from writing covered calls is separate non-speculative business income taxed at your slab rate under Section 43(5)(d). It does not reduce your cost of acquisition and does not offset the capital gain when you eventually sell the shares. The option premium and the share gain are taxed entirely independently.

Q4 What's the difference between buying an OTM call and buying a futures contract if I'm bullish?

A long futures position gives unlimited gain if right and unlimited loss if wrong, with no premium — only margin. A long OTM call gives leveraged upside if the stock moves enough, but expires worthless (total premium loss) if it does not. Futures need ongoing margin management and have no time decay; options cost only the upfront premium but lose value every day through theta.

Q5 Can I sell a call option without owning the underlying shares?

Yes — this is a naked call, the riskiest options position, because losses are theoretically unlimited if the stock rises sharply. Brokers demand very high margins for naked writing and many restrict it for retail clients who do not meet experience criteria. A covered call is different: you hold the underlying shares as protection against the delivery obligation.

Q6 How does the Budget 2026 STT hike affect option buyers and sellers?

From 1 April 2026, STT on the sale of an option premium rises from 0.1% to 0.15% (a 50% rate increase) and STT on option exercise rises from 0.125% to 0.15%. Futures STT also jumps from 0.02% to 0.05%. For retail traders doing a handful of lots a month the incremental cost is modest, but for active writers and high-frequency strategies the cumulative annual drag is meaningful and should be built into return expectations.

Key Terms & Definitions

Call Option

A contract giving the buyer the right, but not the obligation, to buy a fixed lot of shares at the strike price on expiry, in return for a premium paid to the writer. The buyer's loss is capped at the premium; the writer takes on the obligation to sell and theoretically unlimited risk.

Premium (Intrinsic + Time Value)

The price of the option. Intrinsic value is Max(0, Spot − Strike) — the profit already available on exercise. Time value is the rest — the market's charge for the chance of a further move, larger with more time to expiry and higher implied volatility, and decaying to zero by expiry.

Moneyness (ITM / ATM / OTM)

The relationship of spot to strike. A call is In-the-Money when spot exceeds strike, At-the-Money when they are roughly equal, and Out-of-the-Money when spot is below strike. OTM calls are all time value, cheapest to buy, and expire worthless most often.

Theta (Time Decay)

The daily erosion of an option's time value purely through the passage of time, all else equal. It accelerates in the final 2–3 weeks before expiry, works against buyers and in favour of writers, and is the single most common reason retail option buyers lose money.

Physical Settlement & Assignment

Indian stock options are settled in actual shares if in-the-money at expiry. The buyer pays the full contract value and receives shares; the assigned writer must deliver them or face a costly auction. There is no cash alternative and, since March 2023, no Do Not Exercise opt-out.

Non-Speculative Business Income

The tax classification of exchange-traded F&O gains under Section 43(5)(d) — taxed at the investor's slab rate, reported on ITR-3, with set-off against any head except salary, an 8-year carry-forward, and a possible Section 44AB audit depending on turnover.