Tax Treatment of Exercised Options: Equity Options

This is one of the most frequently tested concepts in options taxation. When an equity option is exercised or assigned, no gain or loss is recognized on the option itself. Instead, the premium is folded into the stock transaction, either as part of the cost basis or as part of the sale proceeds.

The Core Rule

Upon exercise or assignment:

1. No gain or loss is recognized on the option
2. The premium is incorporated into the stock transaction
3. The holding period of the stock begins fresh on the day after exercise/assignment (the option's holding period does NOT carry over)

Long Call Exercised (Buyer Exercises)

You bought a call and are now exercising your right to buy stock at the strike price.

• Premium paid is added to the strike price to determine cost basis
• Cost basis = Strike price + premium paid
• Holding period of the stock begins on the day after exercise

Example: Buy 1 XYZ 50 call at $3, exercise the call

• Cost basis of stock = $50 + $3 = $53 per share
• Holding period starts at exercise date
• If you later sell at $60, your gain = $60 - $53 = $7 per share

Short Call Assigned (Writer Is Assigned)

You wrote a call and the buyer exercised against you. You must sell stock at the strike price.

• Premium received is added to the strike price to determine sale proceeds
• Sale proceeds = Strike price + premium received
• Gain or loss depends on your cost basis in the stock you deliver

Example: Write 1 XYZ 50 call at $3, assigned (you own stock at $45)

• Sale proceeds = $50 + $3 = $53 per share
• Gain = $53 - $45 = $8 per share
• Character (short-term or long-term) depends on how long you held the stock, not the option

Long Put Exercised (Buyer Exercises)

You bought a put and are now exercising your right to sell stock at the strike price.

• Premium paid is subtracted from the strike price to determine sale proceeds
• Sale proceeds = Strike price - premium paid
• Character depends on how long you held the stock you are delivering

Example: Buy 1 XYZ 50 put at $2, exercise the put (stock cost basis $40)

• Sale proceeds = $50 - $2 = $48 per share
• Gain = $48 - $40 = $8 per share
• Character depends on stock holding period

Short Put Assigned (Writer Is Assigned)

You wrote a put and the buyer exercised against you. You must buy stock at the strike price.

• Premium received is subtracted from the strike price to determine cost basis
• Cost basis = Strike price - premium received
• Holding period of the stock begins on the day after assignment

Example: Write 1 XYZ 50 put at $2, assigned

• Cost basis of stock = $50 - $2 = $48 per share
• Holding period starts at assignment date
• If you later sell at $55, your gain = $55 - $48 = $7 per share

Exercise/Assignment Cost Basis Summary

Memory Aid:

Two simple rules cover all four scenarios:

• Calls ADD premiums (to the strike price) - both buyer and writer
• Puts SUBTRACT premiums (from the strike price) - both buyer and writer

Whether the result becomes "cost basis" or "sale proceeds" depends on whether you are buying stock (call buyer, put writer) or selling stock (call writer, put buyer).

Exam Tip: Gotchas

• "Calls ADD, Puts SUBTRACT" applies to BOTH buyer and writer. The direction of the premium adjustment depends on the option type (call vs put), not on whether you are buyer or writer.
• Cost basis vs sale proceeds is determined by whether you are buying or selling stock. Buying stock (call buyer, put writer) = cost basis. Selling stock (call writer, put buyer) = sale proceeds.

Holding Period Rules

• When you acquire stock through exercise/assignment (call buyer, put writer), the stock holding period begins fresh on the day after
• The option's holding period does NOT tack on to the stock
• When you sell stock through exercise/assignment (call writer, put buyer), the holding period of the stock you held determines the character

This means a call buyer who exercises after holding the option for 2 years still gets a fresh stock holding period starting at exercise.

Exam Tip: Gotchas

• Upon exercise or assignment, NO gain or loss is recognized on the option itself. The premium is folded into the stock transaction.
• The holding period of the stock always begins fresh at exercise/assignment. The option's holding period does not tack on. A call buyer who held the option for 2 years still starts a fresh stock holding period at exercise.