Covered Call: Income on Stock You Own

A covered call combines long stock (at least 100 shares per contract) with a short call on the same underlying. You collect premium from selling the call. In exchange, you give up upside above the call strike if the stock is called away at expiration.

Traders use covered calls for income and a mildly bullish to neutral view on stock they already hold. It is not a substitute for crash protection: the stock can still fall far; premium only cushions part of the loss.

The strategy is also called a buy-write when you buy stock and sell the call in one transaction at some brokers. Economics are the same: long shares plus short call.

Structure

Leg	Action	Role
Stock	Own 100+ shares	Long delta, dividends if paid
Call	Sell (short)	Credit premium; obligation if assigned

Key terms:

• Strike: Cap on sale price if assigned (you sell shares at strike).
• Premium received: Lowers effective cost basis; income if call expires worthless.
• Breakeven (stock P/L including premium): Roughly entry minus premium per share (simplified, ignores dividends and fees).
• Max gain (if held through assignment at strike): Gain from entry to strike plus premium.
• Downside: Stock loss minus premium cushion.

Worked example

You own 100 shares of JKL bought at $80. JKL is $82. You sell the $85 call expiring in 30 days for $1.50 ($150 credit).

• Premium income: $150 (minus fees).
• If JKL finishes at $84: Call expires worthless; you keep shares and premium. Stock gain from $80 entry plus $1.50 premium on the 100 shares (simplified).
• If JKL finishes at $90: You may be assigned and sell at $85, keeping the $1.50 premium. You forgo gains above $85 on those shares.

Match share count to contracts: one call covers 100 shares.

Choosing the call strike

• Closer strike (ATM or slight OTM): More premium, higher chance of assignment, less upside left.
• Farther OTM strike: Less premium, keep more rally room, less income.
• Expiry: Weekly calls decay fast; monthlies balance income and adjustment frequency.

If you would not sell the stock at the strike price, reconsider the strike or skip the trade.

Payoff at expiration

Entry $80, short $85 call, premium $1.50 received. Combined stock plus call outcome per share (simplified).

Stock at expiry	Typical outcome	Approx. P/L vs $80 entry (per share)
$70	Keep stock; call worthless	−$10 + $1.50 = −$8.50
$82	Keep stock; call worthless	+$2 + $1.50 = +$3.50
$85	At strike; may assign	+$5 + $1.50 = +$6.50
$95	Assigned at $85	+$5 + $1.50 = +$6.50 (no gain above $85 on shares)

Assignment rules and early exercise are broker and contract specific. American-style equity calls can be assigned before expiry if deep in the money.

Greeks for this position

Net exposure blends stock and short call.

• Delta: Positive but less than +1 per share equivalent because the short call has negative delta. You participate less in rallies than pure stock.
• Gamma: Short call gamma offsets stock gamma (stock has none); net gamma is often negative from the short option leg near the strike.
• Theta: Often positive net theta: time decay on the short call helps you if the stock stays near or below the strike.
• Vega: Often negative net vega: a vol spike can hurt the short call more than it helps stock.

When Greeks shift: As expiry approaches, the short call's delta moves toward 0 if out of the money or toward −1 if in the money, changing how much stock movement affects your book.

When traders consider a covered call

• Income on a core holding in a range or slow uptrend.
• Willingness to sell at the strike (mental "limit sell" with premium).
• Neutral to mildly bullish outlook, not a strong breakout bet.

Alternatives:

• Want downside floor too: Collar adds a long put.
• No shares yet, willing to buy lower: Cash-secured put.
• Bearish: not a covered call setup; see Long put.

Income expectations

Annualized yield from covered calls depends on how often you sell, strike distance, and stock volatility. A 1% monthly premium on a $100 stock is not "12% guaranteed" because some months the stock drops or gets called away. Track total return (stock + premium - upside given up).

Practical checklist

1. Own at least 100 shares per contract (or round up share count).
2. Pick a strike you are willing to sell at.
3. Check ex-dividend date if the stock pays dividends.
4. Know whether your calls are American (early assignment possible).
5. Plan what you do if the stock drops sharply (hold, add hedge, or close call).

Risks

• Stock decline can exceed premium collected.
• Capped upside if the stock surges; opportunity cost can be large.
• Assignment removes shares you might have wanted to keep for tax or strategic reasons.
• Dividends: Ex-dividend dates can increase early assignment risk on ITM calls.
• Tax lot matching on called-away shares can be complex; confirm with professionals.

Scenario: stock drops 15% after selling the call

You sold a $85 call for $1.50 on stock at $82 (cost $80). Stock falls to $70. The call may be cheap or worthless; you still own stock down from $80 entry, cushioned only by $1.50 premium. A protective put or tighter position size would have addressed crash risk; covered calls alone do not.

Build and save

Model strikes and expirations in the covered call builder, then save from the builder to track combined stock and option P/L on Saved strategies.

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ThetaViz provides educational tools only. This guide is not investment, tax, or legal advice. Prices, margin requirements, and tax rules change. Confirm details with your broker and qualified professionals before trading.