Calls vs puts: compare the seller's obligations
Compare a covered call with a cash-secured put by their obligations, capital needs, and remaining stock exposure.
By OptionsKing. Publisher and editorial methods.
What you will learn
By the end of this lesson, you should be able to:
- Describe the delivery obligation on each side.
- Compare capital and ending holdings.
- Explain why higher put premium does not prove a better trade.
A call and a put create different delivery obligations. To compare them as funded strategies, include the shares behind a covered call and the cash behind a cash-secured put. Looking only at the option premium leaves out most of the capital and downside exposure.
Compare two contracts on the same chain
Use an illustrative CMG price of $38.40 and 45 days to expiration. The strikes below have broadly comparable absolute delta, but different implied volatilities and modeled expiration probabilities.
| Measure | $43 covered call | $34 cash-secured put |
|---|---|---|
| Option delta | 0.205 | -0.184 |
| Implied volatility | 34.8% | 44.0% |
| Illustrative sale price | $0.49 | $0.64 |
| Credit per standard contract | $49 | $64 |
| Model-implied ITM finish | 17.2% | 22.8% |
| Capital measure | 100 shares worth $3,840 | $3,400 reserved cash |
| 45-day premium yield | 1.28% | 1.88% |
| Simple annualized premium yield | 10.4% | 15.3% |
| Assignment obligation | Sell 100 shares at $43 | Buy 100 shares at $34 |
The put pays a larger credit and has lower absolute delta, yet its modeled chance of finishing in the money is higher. Delta is a price sensitivity, not the exact expiration probability. These probabilities are risk-neutral model estimates, not measured assignment frequencies.
Why the premiums differ
The put uses 44.0% implied volatility and the call 34.8%, a 9.2-percentage-point difference. This downward-strike volatility skew can reflect demand for protection and compensation for downside tail risk. It does not establish that either contract is mispriced or that the richer premium adequately compensates this particular seller.
Compare put skew with delta as a probability shortcut. The two explain different parts of this table: the price of downside exposure and the distinction between sensitivity and probability.
Work through a rally and a decline
If CMG finishes at $49 and the call is assigned, the covered-call shares sell for $4,300. Against their $3,840 starting value, the $460 stock gain plus $49 credit produces $509. Simply holding the shares would gain $1,060, so the covered call trails by $551 after including its premium. The put would normally expire worthless and retain $64, with its reserved cash released.
If CMG finishes at $29, the covered call normally expires worthless, but its shares lose $940; after $49 credit, the combined loss is $891. The put is normally assigned: buying at $34 when shares are worth $29 produces a $500 stock shortfall, offset by $64 credit, for a $436 loss. Both funded positions can lose money in a decline. Call assignment is not the covered call's only adverse scenario.
American-style options may be exercised earlier, and near-strike exercise outcomes can differ from a simple expiration rule. The examples assume ordinary expiration exercise and omit fees, dividends, interest and taxes.
Choose the exposure before comparing yields
A covered call commits existing shares to a possible sale and gives up upside above the strike. A cash-secured put commits cash to a possible purchase below which substantial stock losses remain. Existing ownership does not make a call automatically appropriate, and willingness to own a company does not make every put strike affordable.
Ask whether you can accept the delivery obligation, concentration and downside outcome. Then calculate premium divided by the relevant capital: $49 / $3,840 for the call and $64 / $3,400 for the put. These are premium yields, not total-return forecasts. The capital-requirement lesson develops the funding calculation.
Separate the option from the whole position
A standalone short call has negative delta; a short put has positive delta. Adding shares makes the covered call a different combined exposure. Both short options generally have positive theta and negative gamma and vega, but stock movement and volatility changes can outweigh time decay. Read the short-option Greeks as sensitivities, not promises.
Check your understanding
Does the lower delta on the $34 put prove it has less assignment risk than the $43 call?
Show the explanation
No. Their deltas are only rough probability proxies. The model's finish probabilities in the table are 22.8 percent for the put and 17.2 percent for the call. Different volatility and payoff shapes prevent a lower delta from establishing lower overall risk.
Common questions
Is it better to sell calls or puts?
First identify the exposure you want. A covered call includes owned shares; a cash-secured put includes a funded purchase obligation. This example's downside skew produces a richer put premium at comparable delta, but that is not a universal ranking.
Why do puts have higher implied volatility than calls?
The comparison uses different strikes: 44.0% IV for the $34 put and 34.8% for the $43 call, a 9.2-point gap. Downside skew can reflect protection demand and tail-risk compensation. It does not imply that puts always have higher IV than calls at the same strike and expiry.
Is selling a put bullish?
Yes. A standalone short put has positive delta and limited maximum gain, with substantial downside. It can profit through a modest decline if the stock stays above break-even; willingness to own shares does not remove the directional risk.
Should I sell a call on a stock I think will fall?
Not a naked one. The loss on an uncovered short call has no upper bound and a takeover or a squeeze on a hated name is exactly the event that produces it. If you own the shares a covered call is a different trade entirely.
Sources
Rules and thresholds above were checked against these documents on August 4, 2026. Exchange and broker rules change. Confirm anything you are about to act on with your own broker.
Keep reading
Do the math on your own trade
Every price in this article is an illustrative worked example, not a quote. Read Options basics for the rest of the series, and the disclaimer before you act on any of it. Selling options carries real risk of loss, and the loss can be far larger than the premium you collected.