Covered Call Assignment Calculator

Calculate your total return when your covered call is exercised and shares are called away at the strike price.

MB
Operated by Mustafa Bilgic
Independent individual operator
Advanced Covered CallsEducational only

Input Values

$

The price you paid per share for the stock.

$

The strike price at which your shares are being called away.

$

The total premium received from selling the call option.

$

The current market price (to see opportunity cost).

Number of option contracts assigned.

$

Total commissions paid for the entire trade.

Results

Capital Gain on Stock
$1,000.00
Total Premium Income
$350.00
Total Profit
$0.00
Total Return (%)
0.00%
Opportunity Cost$0.00
Effective Sale Price$0.00
Results update automatically as you change input values.

Related Strategy Guides

What Happens When a Covered Call Is Assigned?

When a covered call is assigned, the buyer of your call option exercises their right to purchase your shares at the strike price. Your broker automatically transfers the shares from your account at the strike price, regardless of the current market price. You keep the premium you received when you sold the call, and you receive the strike price per share in cash. Assignment typically occurs at expiration if the stock price is above the strike price, but it can happen at any time (early assignment).

Assignment is not a negative outcome for covered call writers. In fact, it represents the maximum profit scenario because you earn both the capital gain from stock appreciation (up to the strike) and the full option premium. The only potential downside is the opportunity cost if the stock continues rising beyond the strike price, but this was a known trade-off when you sold the call. Professional covered call writers view assignment as a successful trade outcome.

i
Assignment Is Not a Penalty

Many beginners fear assignment, but it simply means you sold your stock at the agreed-upon price. Your total profit includes the premium received plus any capital gain from purchase price to strike price. Assignment means the trade worked exactly as designed.

Calculating Your Assignment Profit

Total Profit on Assignment
Total Profit = (Strike Price - Purchase Price + Premium) × 100 × Contracts - Commissions
Where:
Strike Price = The price at which your shares are sold
Purchase Price = Your original cost basis per share
Premium = Option premium received per share
Contracts = Number of contracts assigned
Effective Sale Price
Effective Sale Price = Strike Price + Premium Received
Where:
Strike Price = The assigned strike price
Premium Received = The per-share premium from selling the call
Opportunity Cost
Opportunity Cost = (Current Stock Price - Strike Price) × 100 × Contracts
Where:
Current Stock Price = Where the stock is trading at assignment
Strike Price = The price you sold at
Covered Call Assignment Example
Given
Purchase Price
$95
Strike Price
$105
Premium
$3.50
Current Price
$112
Contracts
1
Calculation Steps
  1. 1Capital gain = ($105 - $95) × 100 = $1,000
  2. 2Premium income = $3.50 × 100 = $350
  3. 3Total profit = $1,000 + $350 = $1,350
  4. 4Total return = $1,350 / ($95 × 100) = 14.21%
  5. 5Effective sale price = $105 + $3.50 = $108.50
  6. 6Opportunity cost = ($112 - $105) × 100 = $700 (gains you missed)
Result
Assignment yields a $1,350 total profit (14.21% return). Although the stock is at $112, your effective sale price was $108.50. The $700 opportunity cost represents gains above the strike you agreed to forgo.

The Assignment Process: Step by Step

What Happens During Assignment

1
Option Holder Exercises
The buyer of your call option notifies their broker they want to exercise. This can happen any time before expiration for American-style options. At expiration, options that are $0.01 or more in-the-money are automatically exercised.
2
OCC Assigns Randomly
The Options Clearing Corporation (OCC) randomly assigns the exercise notice to a broker, and the broker assigns it to one of their customers who is short that option. Your broker notifies you of the assignment, usually before market open the next day.
3
Shares Transfer at Strike
Your 100 shares per contract are transferred to the option buyer at the strike price. Cash equal to the strike price × shares appears in your account. This settlement occurs T+1 (next business day).
4
Position Closes
Your short call option disappears from your account as the obligation has been fulfilled. You no longer have any option position. The premium you originally received remains yours.
5
Record for Taxes
Record the transaction: sale price = strike price, plus adjust for the premium received. The premium is added to your sale proceeds. Determine whether the gain is short-term or long-term based on how long you held the stock.

Assignment Scenarios Comparison

Assignment Outcomes by Stock Price
Stock at AssignmentCapital GainPremium KeptTotal ProfitOpportunity Cost
$105 (at strike)$1,000$350$1,350$0
$108$1,000$350$1,350$300
$112$1,000$350$1,350$700
$120$1,000$350$1,350$1,500
$130$1,000$350$1,350$2,500

Notice that your profit is the same regardless of how high the stock goes above the strike. The opportunity cost increases, but your actual realized profit remains $1,350. This is the fundamental trade-off of covered calls: you exchange unlimited upside for immediate premium income and a known maximum return.

What to Do After Assignment

  • Consider selling a cash-secured put at or below the old purchase price to potentially re-enter the stock at a lower cost (the wheel strategy)
  • Evaluate whether to repurchase the stock at current prices if you remain bullish
  • Invest the proceeds in a different opportunity if the stock appears overvalued
  • Review the trade results to improve your strike selection for future covered calls
  • Account for tax implications: determine if the gain is short-term or long-term
  • If using the wheel strategy, wait for a pull-back before selling the put to get a better entry price
!
Tax Note on Assignment

When your covered call is assigned, the premium received is added to your sale proceeds for tax purposes. If you held the stock for more than one year AND the call was a qualified covered call, the stock gain may qualify for long-term capital gains rates. However, the premium itself is always treated as short-term. Consult your tax advisor for your specific situation.

Recommended Reading

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Frequently Asked Questions

When assigned, you must sell your 100 shares per contract at the strike price, regardless of the current market price. Your broker handles this automatically. You receive cash equal to the strike price times the number of shares, and you keep the premium you collected when selling the call. Assignment means the call buyer exercised their right to purchase your shares.

Sources & References

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