Option premium and pricing

This lesson breaks the premium into its component parts: it shows what portion of the option price is intrinsic value and what portion is time value, and how to calculate the break-even threshold from those numbers. It is for a reader who already knows calls and puts — their definition, strike, and multiplier are described in the lesson What is an option — and wants to understand why a cheap option can be expensive, before spending the first dollar on a long premium.

What the option premium consists of

Intrinsic value is the portion of the premium the option already has right now, if it expired this instant. Time value is the rest — payment for the remaining time and for expected volatility. The deeper the option is ITM, the larger the share of the premium that intrinsic value represents. ATM and OTM options consist almost entirely of time value, which is why they react so strongly to the passage of time and to changes in IV.

The shape of the result on expiry day is not the same as the current value of the position. Up to that date, the position value marked to market moves together with IV and with delta, so watch two horizons at once: what will remain at expiry, and what you see on the account today.

Formulas: intrinsic value, time value, and break-even

intrinsic_value_call  = max(0; spot − strike)
intrinsic_value_put   = max(0; strike − spot)
time_value            = premium − intrinsic_value
break_even_long_call  = strike + premium
break_even_long_put   = strike − premium

All quantities in the first three lines are prices per one underlying unit. If you want the amount for a contract, multiply the result by the multiplier — for a typical US equity contract that is 100, but check the exact value with your broker.

Illustrative example: the call strike is 100 USD, spot is 103 USD, premium is 4.50 USD. Intrinsic value is 3.00 USD, time value is 1.50 USD, and the break-even threshold is 104.50 USD. For the long call to come out at zero on expiry day, the price must rise by 1.50 USD from the current level, that is, by just under 1.5%. That is the number you compare with the instrument’s real behaviour over a similar period — confirm historical volatility from a source, instead of relying on a hunch.

Protocol: six steps of premium decomposition

You run this sequence on demo for every option you consider. It takes a few minutes and replaces guessing.

1. Record spot, strike, premium, and the number of days to expiry.
2. Calculate intrinsic value with the formula for your option type — call or put.
3. Subtract intrinsic value from the premium. The result is time value; record what percentage of the premium it represents.
4. Calculate the break-even threshold and convert it into a percentage change of the underlying relative to the current price.
5. Check whether the required change fits within the range the instrument has covered over a similar period. If you have no data, record that as an unknown, not as an assumption.
6. Record what will happen to the premium if spot does not move by the next session: for a long, the loss will be close to theta per day, increased by the IV change.

If after step three time value accounts for almost the entire premium, you are not buying exposure to price — you are making a bet on a move within a defined deadline. Such a bet can be sensible, but it requires a conscious decision, not an accident.

Theta and vega — two costs the long pays

A long premium pays for the passage of time. You can be right about direction and still lose if the move comes too late or is too small. The other side of the ledger is volatility: vega rises together with IV, while theta takes away part of the time value every day. The lesson on theta and time in options describes how to separate these two effects on a single position.

IV crush after earnings — why direction is not enough

Before an earnings release or another known event, the market prices the expected move higher, so options are more expensive. After the release, uncertainty disappears and IV usually falls — a phenomenon called IV crush. Illustrative numbers: an ATM call before earnings costs 4.00 USD, a multiplier of 100 gives 400 USD, that is about 1,600 PLN (Polish złoty) at a rate of 4 PLN per dollar. The underlying rises slightly, but IV falls and the same option is worth 2.80 USD. The long was right about direction and lost. The lesson on IV crush after earnings breaks down the mechanism, and check the multiplier and rate with your broker.

What else moves the premium

Interest rates usually have the smallest practical effect for a retail trader in the short term. Spot, time, and volatility remain the most important to remember. Indicators such as IV rank are context, not a signal: high IV does not automatically mean sell, and low IV does not automatically mean buy.

Observation table: five sessions on one ATM option

Fill it in daily after the session closes, for one chosen option with 30-45 DTE.

The last two columns turn observation into measurement. Without them, the table shows only that the premium changed — not why.

When pricing says do not trade

1. Time value is almost the entire premium, and the thesis requires a fast move. The larger the share of time value, the faster the passage of days works against you.
2. You are entering before a known event without a plan for the IV drop. If you do not know how you will react to the crush, you have no exit plan.
3. You are comparing premiums in the instrument currency without reference to the underlying price. A 5 USD premium on a 20 USD instrument and on a 500 USD instrument are two different situations.
4. You cannot state the break-even threshold as a percentage. Missing that number means you do not know what move you need.

Common mistakes in assessing pricing

• Comparing premiums in the instrument currency without spot context — the same amount means something different on a 20 USD instrument and a 500 USD one.
• Buying options right before a known event without awareness of IV crush — high IV before earnings means the market has already priced in a large part of the expected move.
• Confusing a low premium with an opportunity — a low OTM premium usually describes low probability, not a market pricing error.
• Ignoring DTE when comparing two options — the same premium with a different time to expiry is a different risk profile.
• Forgetting about commissions — round-trip cost shifts the break-even threshold and, on small positions, can be a larger part of the loss than theta itself.

Exercise

On demo, choose one ATM option with 30-45 DTE. Decompose its premium according to the protocol in this lesson and record the result in the observation table. Over five sessions, note spot, premium, IV, and DTE. At the end, answer in one sentence whether spot, time, or volatility moved the premium, and state the break-even threshold as a percentage. Goal: your own numbers instead of a memorised formula.

Check yourself

Common questions

How does intrinsic value differ from time value?

Intrinsic value is the part of the premium the option already has in the money. Time value is the rest, that is, payment for time and volatility. OTM options consist almost entirely of time value, which is why they can go to zero without any price move.

Why can I be right about direction and still lose on a long option?

Because you pay for time and volatility. A move that is too small, too late, or an IV drop after an event eats the premium despite the correct direction. That is why not only direction matters, but also the deadline and the scale of the move.

Is short premium easy income?

No. Theta works in your favor until a jump in price or volatility arrives. An uncovered short has undefined or very large risk, so start with structures that have a calculated maximum loss.

Why decompose the premium into parts when the platform shows the price?

Because the price alone does not tell you what you have actually bet on. The same premium level can mean mostly intrinsic value, and therefore exposure to price, or almost purely time value, that is, a bet on a move within the deadline. Decomposing the premium lets you calculate the break-even threshold and compare it with the instrument's real volatility. Without that you compare two options by price, not by the conditions they offer.