SIE Options Basics: Calls vs Puts Explained (With Examples)

Options trip up more SIE candidates than almost any other topic — not because the math is hard, but because the vocabulary stacks up fast. Calls, puts, premium, strike, intrinsic value, writers, holders. Miss one definition early and the rest of the section feels like a foreign language.

This post breaks down the foundation: what calls and puts actually are, the terminology the exam tests, and how to tell in-the-money from out-of-the-money without second-guessing yourself.

What Is an Option?

An option is a contract that gives the buyer the right — not the obligation — to buy or sell an underlying asset at a fixed price, for a limited time. The buyer pays a premium for that right.

That “right vs. obligation” split is the whole game:

• Option buyers have rights. They can walk away.
• Option sellers (writers) have obligations. If the buyer exercises, the writer must perform.

There are only two types of options: calls and puts.

Calls: The Right to Buy

A call option gives the holder the right to buy the underlying at the strike price. Call buyers are bullish — they expect the price to rise.

Example: You buy a call with a $50 strike. The stock climbs to $60. You exercise and buy at $50, $10 below market.

Memory hook: a call lets you “call the stock away” from someone else.

Puts: The Right to Sell

A put option gives the holder the right to sell the underlying at the strike price. Put buyers are bearish — they expect the price to fall.

Example: You buy a put with a $50 strike. The stock drops to $40. You exercise and sell at $50, $10 above market.

Memory hook: a put lets you “put the stock to” someone else.

The Terminology the SIE Tests

Term	Definition
Premium	Price paid for the option
Strike (exercise) price	Price at which you can buy or sell the underlying
Expiration date	Last day the option can be exercised
Underlying	The asset the option controls
Contract size	Standard = 100 shares per contract

One detail the exam loves: one contract controls 100 shares, and the premium is quoted per share. A premium quoted at $3 means a total cost of $3 × 100 = $300 — which is also the maximum the buyer can lose.

In, At, and Out of the Money

“Moneyness” describes whether exercising the option right now would make sense. It works in opposite directions for calls and puts.

For calls (you want to buy low):

Status	Condition	Example (strike $50)
In-the-money	Market > strike	Stock at $55
At-the-money	Market = strike	Stock at $50
Out-of-the-money	Market < strike	Stock at $45

For puts (you want to sell high):

Status	Condition	Example (strike $50)
In-the-money	Market < strike	Stock at $45
At-the-money	Market = strike	Stock at $50
Out-of-the-money	Market > strike	Stock at $55

If you only remember one thing: puts are the mirror image of calls. A put is in-the-money when the market is below the strike.

Intrinsic Value vs. Time Value

Every premium is made of two parts:

Premium = Intrinsic Value + Time Value

• Intrinsic value is the real, immediate value if you exercised right now.
  • Call: Market price − Strike price (if positive)
  • Put: Strike price − Market price (if positive)
• Time value is the extra you pay for the time still left on the contract: Premium − Intrinsic value.

Out-of-the-money options have zero intrinsic value — their entire premium is time value.

Worked example: A call has a $50 strike and trades at a $7 premium. The stock is at $54.

• Intrinsic value = $54 − $50 = $4
• Time value = $7 − $4 = $3
• Premium ($7) = Intrinsic ($4) + Time ($3) ✓

Buyers vs. Writers at a Glance

	Buyer (long)	Writer (short)
Premium	Pays it	Receives it
Has	Rights	Obligations
Wants the option to	Be exercised	Expire worthless
Time decay	Hurts them	Helps them

This table is the bridge to the next topic — maximum gain, maximum loss, and breakeven for each of the four positions — which is where the SIE asks most of its options questions.

Quick Self-Check

Before moving on, make sure you can answer these cold:

1. A call buyer expects the price to do what?
2. A put is in-the-money when the market price is _____ the strike.
3. An option premium of $4 represents a total cost of how much per contract?
4. If a put has a $60 strike, the stock trades at $52, and the premium is $10 — what is the time value?

(Answers: 1 — rise; 2 — below; 3 — $400; 4 — intrinsic value is $8, so time value is $2.)

Key Takeaways

• Call = right to buy; Put = right to sell. Buyers are bullish on calls, bearish on puts.
• Buyers have rights; writers have obligations. Buyers pay the premium; writers collect it.
• One contract = 100 shares; premium is quoted per share.
• Moneyness is reversed for puts — in-the-money when the market is below the strike.
• Premium = intrinsic value + time value. Out-of-the-money options have only time value.

Lock these definitions down now. Every options question on the SIE — max gain/loss, covered calls, protective puts — builds directly on this foundation.