For an existing covered call, the option opens with sell to open and closes with buy to close. Buy to open creates a different, long-option position.
Check permissions and the existing position first
Use a broker-approved account and inspect the exact underlying, call/put type, expiry, strike, multiplier and deliverable. The teaching example uses 100 owned shares and one standard 100-share US equity call. A contract count of 1 is not one share. If you own 150 shares, one such call is covered, while two would require 200 deliverable shares.
OIC’s opening/closing terminology is the reference. Broker names, screens, approval levels and order availability vary by jurisdiction and account. These steps explain what the order means; they are not a claim that a Malaysian or other account can place it. Read the current disclosure and your broker’s own requirements.
Background source: OIC: opening and closing positions; contract exposure
Open the call side with sell to open
For the fictional strike 55 call, assume the option fills at USD2 per share. Sell to open 1 call creates a short 1 option position and brings in USD200 before costs. Check the filled order, not only a submitted-order message. A limit order can restrict the price you accept but may not fill; the displayed midpoint is not a guaranteed execution.
Keep the matching stock shares available. The stock purchase or existing holding is the other leg. If a stock leg and option leg are entered separately, execution can leave temporary exposure if only one fills; supported combination orders have their own broker-specific instructions.
A buy-write opens both legs
In a simultaneous example, buy 100 shares at 50 and sell one call at 2. Gross stock cash is−USD5,000, option cash+USD200 and net debit USD4,800 before fees. This does not mean you bought a call for a discount: you bought stock and sold a call obligation.
Verify the combination’s quantities, net-price convention, filled legs and resulting positions. Do not assume a negative or positive number means the same cash direction on every ticket. If the broker does not support the intended combination, its available order instructions and risk controls govern; Numbrite does not route or simulate execution.
| Option instruction | Option position after fill | Fictional cash before fees |
|---|---|---|
| Sell to open1 at2 | Short1 | +USD200 |
| Buy to close1 at0.60 | Short0, stock remains | −USD60 |
| Buy to open1 at2, independent case | Long1, not the covered-write opening | −USD200 |
Close the short call with buy to close
Suppose the still-open call can actually be bought back at 0.60. Buy to close 1 of the same series costs USD60 before fees and takes short 1 to 0 once filled. The call-only realized gain is USD200 −USD60 =USD140 before costs. The 100 shares remain; their unrealized profit or loss is separate.
If the buyback instead costs 4, the call leg loses USD200. An outstanding closing order is not a filled closing trade. If assignment has already occurred, inspect the actual stock and option positions rather than assuming a buyback can undo a completed delivery. Do not duplicate a closing order after a delay without checking its status.
Buying a fresh call is a different position
Buy to open 1 call at 2 creates a long call and pays USD200. That is not the covered-call writer’s opening trade. Buying a different strike or expiry also does not by itself close the existing short call; it can create a multi-leg position with different risks.
To stop writing calls while keeping the stock, confirm the intended short series is closed and inspect that the resulting option quantity is zero. To exit the whole covered position, both the short-call and stock legs need appropriate handling. Selling the shares while the short call remains can leave an uncovered call with potentially unlimited upside loss.
Keep a position and cash checklist
Record the option series, side, open/close intent, quantity, quoted unit, multiplier, actual fills, costs and resulting short quantity. Reconcile stock ownership and any assignment separately. A premium receipt is not a dividend and should not be inserted into a stock-dividend field simply to increase an income chart.
The downloadable cash worksheet is manual learning material. DividenNote in this release cannot value open options, enforce coverage or record assignment as an options lifecycle. The next article follows an early-assignment case and a roll whose net cash credit hides an already-realized loss.
Download the learning data and worksheets
Put it into practice
Use the worksheet to distinguish order direction and remaining obligations before reading the assignment and roll examples.
Read assignment and rolling cases