Real Estate & Investing
Covered Call Income Calculator
Work out what a covered call pays you, where your breakeven sits, and what happens to your position if the shares are called away.
Calculation inputs
Enter the premium per contract in dollars — one contract covers 100 shares.
Results
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Complete the fields and select Calculate to show results here.
Educational tool only. Not investment advice. Options involve risk of loss.
About this calculator
This calculator works out the premium income, breakeven price, and possible outcomes of selling covered calls against shares you already own. It is meant for investors and options traders comparing the income a covered call generates against the risk of having shares called away below their current market value.
How the calculation works
- Total premium income = premium per share × 100 × contracts
- Breakeven price = stock price − premium per share
- Downside protection % = premium per share ÷ stock price × 100
- Annualized yield % = total premium ÷ position value × (365 ÷ days) × 100
- If assigned: P/L = (strike − cost basis) × shares + total premium
- Assignment probability ≈ N(−d) where d = ln(strike ÷ stock price) ÷ (IV × √(days ÷ 365))
Notes and assumptions
The assignment probability is a rough normal-distribution approximation — it ignores dividends, interest rates, and early assignment.
Annualized yield assumes you could repeat the same trade all year, which market conditions may not allow.
How it works in plain English
A covered call means selling call options against shares you already hold, collecting a premium upfront in exchange for agreeing to sell those shares at a set strike price if the option is exercised. The calculator multiplies the premium per contract by 100 shares per contract and by the number of contracts sold to get total premium income, then divides that by the position's current value to get a static return, the return if the shares are not called away.
Breakeven price is the current stock price minus the premium received per share, showing how far the stock could fall before the trade becomes a net loss. If the shares are assigned, meaning the option is exercised and the shares are sold at the strike, profit or loss is calculated from the difference between the strike price and your original cost basis, plus the premium already collected.
The calculator also estimates a rough probability of assignment using the strike price, time to expiration, and implied volatility, based on a standard options pricing approach. This is a simplified estimate rather than a precise pricing model, and it does not account for dividends, interest rates, or changes in volatility before expiration.
The formula
- Total premium income = premium per contract x contracts sold
- Breakeven price = current stock price - premium per share
- Static return = total premium / position value x 100
- Annualized yield = static return x (365 / days to expiration)
- P/L if assigned = (strike price - cost basis) x shares + total premium
Worked example
An investor owns 500 shares bought at a $44 cost basis, now trading at $52, and sells 5 call contracts at a $57.50 strike for $130 in premium per contract, expiring in 45 days. Total premium income is 5 x $130 = $650, and breakeven is $52 - $1.30 = $50.70 per share.
If the stock stays below $57.50, the investor keeps the shares and the $650 premium, a static return of about 2.5% on the $26,000 position. If the stock rises above $57.50 and the shares are assigned, profit is (57.50 - 44) x 500 + 650 = $7,400, a return of roughly 33.6% on the original cost basis.
Frequently asked questions
What does 'covered' mean in a covered call?
It means the seller already owns enough shares to deliver if the option is exercised, in this case at least 100 shares for each contract sold. This is different from selling a 'naked' call without owning the underlying shares, which carries theoretically unlimited risk.
What happens if the stock price stays flat until expiration?
If the stock closes below the strike price at expiration, the option typically expires worthless, the seller keeps both the shares and the full premium, and can choose to sell another call for the next period. This is the 'static return' scenario shown by the calculator.
Why is the assignment probability described as rough?
It uses a standard options pricing formula based on implied volatility, time to expiration, and the gap between stock price and strike, but it assumes volatility stays constant and ignores factors like dividends or sudden news events. Real assignment likelihood can differ from this estimate.
Does selling a covered call limit my upside?
Yes. If the stock rises above the strike price, the shares will likely be called away at that strike, meaning any gain beyond the strike price (plus premium collected) is given up. This tradeoff, extra income now for a capped upside, is the central feature of the strategy.
Is downside protection from the premium significant?
It offsets losses only up to the amount of premium received per share; if the stock falls further than that, the position still loses money, just less than holding the shares alone. The calculator's breakeven price shows exactly how far the cushion extends.
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