Deciding direction is the part everybody discusses. Deciding which strike to use is the part that determines whether being right about direction actually pays, and it gets a fraction of the attention.
Every strike on the chain is available to you. They are not variations of the same trade — they are materially different positions.
The three regions of the chain
Strikes are usually described by their relationship to the current price of the underlying.
In the money. A call option with a strike below the current price, or a put option with a strike above it. It already has intrinsic value — the amount by which it is in the money — plus some time value. It is the most expensive to buy, it moves closest to one-for-one with the underlying, and proportionally the least of what you pay can evaporate through time decay.
At the money. A strike near the current price. Almost all of the premium is time value, and this region carries the fastest decay and the greatest sensitivity to changes in implied volatility.
Out of the money. A call option with a strike above the current price, or a put option below it. No intrinsic value at all — the entire premium is time value and will be worth nothing at expiry unless the underlying moves past the strike. Cheapest to buy, and the most likely to expire worthless.
The single most useful summary: as you move further out of the money, the cost falls and the probability of the position being worth anything falls with it. Nothing is being given away. The cheaper option is cheaper because it is less likely to pay.
Why the cheap strike is usually the expensive decision
The most common beginner path is to buy the cheapest option available, because it allows a position with a small amount of money. The arithmetic of that deserves stating plainly.
A far out-of-the-money option needs two things to happen, not one. The underlying must move in your direction, and it must move far enough to pass the strike, and it must do both before expiry. Each additional requirement reduces the probability, and the market prices the option accordingly — which is exactly why it was cheap.
So a run of small losses on cheap options is not bad luck. It is the expected outcome of repeatedly buying low-probability positions, and the occasional large winner is what the pricing already assumes will happen.
A rough and useful tool: the delta of an option approximates the market's implied probability of it finishing in the money. An option with a delta around 0.20 is roughly a one-in-five proposition. That is not a forecast and it is a far better sense of what you are buying than the premium alone. It is visible on most trading screens, and looking at it before entering changes how people size positions.
The other half of the arithmetic is the break-even. For a bought call option, the underlying must exceed the strike plus the premium paid for you to make anything at expiry. Compute that number before entering and ask whether the move it requires is one you actually expect, over the days remaining rather than eventually.
Matching the strike to the view
The choice should follow from what you actually believe, and the three common cases look like this.
A strong view on a specific move, with a clear horizon. An at-the-money or slightly in-the-money option gives the most reliable participation. It costs more; it also behaves closest to the underlying and does not depend on an unusually large move.
A view on a large move that others are not expecting. This is the honest case for an out-of-the-money option, and it requires believing something specific rather than hoping. It should be sized as what it is — a position most likely to be worth nothing.
A view with a limited target. If you expect a move of a defined size, a spread is usually more appropriate than a single option: buy the nearer strike, sell one at the level you expect the move to stop, and reduce the cost in exchange for capping the gain you did not expect anyway.
Three practical constraints that override all of the above:
Liquidity thins as you move away from the current price. Far strikes can have wide spreads, so the cost of entering and leaving grows exactly where the premium is smallest.
Time remaining changes everything. The same strike on a weekly and a monthly contract are different positions. A near-dated out-of-the-money option is the fastest-decaying instrument on the board.
For sold options, the logic inverts. A further out-of-the-money strike is more likely to expire worthless, which is what a seller wants, and collects less premium for carrying a loss that remains large when it arrives.
An account that shows the chain
Premium, delta and depth side by side before you choose. Free to open
Contract specifications, strike intervals and margin rules are set by the exchanges and revised periodically — confirm current details before acting. Delta as a probability estimate is an approximation, not a guarantee. This is educational material, not advice, and nothing here recommends any position. We run no tips group and no signal service, we manage nobody's money, and no return is promised. A bought option can lose its entire premium and a sold option can lose considerably more.
Disclosure: the account-opening link on this page is under Atul Shrivastava's Zerodha Authorised Person registration (NSE AP Reg: AP2516003481; Zerodha Broking Ltd. SEBI Reg: INZ000031633) and earns a revenue share. TheFinBaba is not a SEBI-registered Investment Adviser — this content is educational, not investment advice.
A short checklist before you choose
Five questions, none of which takes more than a few seconds once the habit exists.
What is the break-even, and is that move plausible in the days available? Strike plus premium for a bought call option, strike minus premium for a bought put option. If the required move is larger than anything the underlying has done recently in that time, the position is a hope rather than a view.
What does the delta imply about probability? Not as a forecast, as a sense of scale. People who check it stop buying twenty-delta options with an expectation appropriate to fifty-delta ones.
What is the spread on this exact contract? Look at the quoted buy and sell prices for the strike you intend to trade, not the headline volume of the underlying.
Would a spread serve the same view more cheaply? If your expected move has a ceiling, you are paying for upside you do not expect.
Is the expiry matched to the horizon of the view? A view about the next month expressed in a contract expiring this week is a different bet from the one you intended to take.
None of this improves your opinion about direction. It decides how much of being right you actually collect, which over a year of positions matters more than most people expect.
Frequently Asked Questions
Which strike should I buy?
The one that matches your view and horizon. At-the-money or slightly in-the-money options participate most reliably and cost more. Out-of-the-money options are cheap because they are unlikely to pay, and should be sized as positions that will most often be worth nothing.
Why do cheap options keep expiring worthless?
Because that is what their price implies. A far out-of-the-money option needs the underlying to move in your direction, past the strike, before expiry. Each requirement lowers the probability, and the premium already reflects it.
Can delta tell me the probability of profit?
It approximates the market's implied probability of the option finishing in the money, which is a useful sense of scale rather than a forecast. Note that finishing in the money is not the same as being profitable, since the premium paid still has to be recovered.
How do I calculate the break-even?
For a bought call option it is the strike plus the premium paid; for a bought put option it is the strike minus the premium. Work it out before entering and ask whether that move is plausible in the days remaining, not eventually.
Does strike choice work the same way for selling?
The logic inverts. A strike further out of the money is more likely to expire worthless, which is what a seller wants, but it collects less premium while the loss when it arrives remains large. Selling is about the tail, not about the frequency.
Related Reading
- Options taught for a comfortable account
- If you pull the chain programmatically
- What delta actually measures
- Reading the chain around your strike
- Capping a view with a second strike
- Why every strike costs more some weeks
Disclaimer: TheFinBaba provides educational content only - this is not investment advice. Trading involves risk of loss.
