Covered Call Calculator
Covered call calculator. Premium income, breakeven, max profit if called, static + annualised returns. The classic income-options strategy for stocks you already own.
Covered Call Calculator
How to use the covered call calculator
Enter your stock cost basis
Your average purchase price per share. From your broker statement: total cost ÷ shares owned. The cost basis is what you "paid" for the stock; covered call analysis compares to where you can sell via assignment.
Choose the call strike price
Typically out-of-the-money (above current stock price). Tighter strikes (close to current price) earn more premium but get called away more often. Wider strikes earn less premium but allow more capital appreciation. Most income writers target 30-50 delta strikes (~25-40% probability of being called).
Enter the call premium received
The price you collect by writing the call — from your broker's option chain (use mid-market between bid and ask). For high-IV underlyings, premiums of 1-3% of strike for monthly expiries are typical. For low-IV blue chips, 0.5-1.5% is more realistic.
Set position size + days to expiration
Covered call contracts = 100 shares each. Enter total shares owned (must be ≥100 in multiples of 100). Days to expiration: weekly 7d, monthly ~30d, "front month" typical for most writers. For return annualisation: 30-day premium × 12 ≈ annualised yield estimate.
Read static vs called-away returns
Static return: what you earn if the stock stays below strike at expiry (you keep premium + still own shares). Called return: what you earn if assigned (premium + capital gain to strike). Annualised assumes you can repeat the strategy; real results vary with IV regime and assignment frequency.
The covered call — Wall Street\'s favourite income strategy
The covered call is the single most-used options strategy by retail and institutional income investors. It combines a long stock position (100 shares minimum) with a short call option on that stock — collecting premium income in exchange for capping the upside. The strategy is mechanically simple: own the shares, sell a call slightly above the current price, collect cash today, repeat monthly. Done systematically, covered calls can add 5-15% per year of additional income on top of dividends and capital gains. CBOE\'s BXM index (Buy-Write Monthly index) tracks systematic monthly S&P 500 covered call writing — over the past 30+ years it has produced returns roughly equal to buy-and-hold S&P 500 with notably lower volatility.
Why it works (and when it doesn\'t)
Covered calls profit when (a) the stock stays flat or rises modestly to strike — you keep premium + dividends + capital gain to strike, or (b) the stock drops modestly — premium softens the loss. The strategy underperforms buy-and-hold when the stock rallies sharply through the strike before expiry — you give up upside above strike + premium. This is the central trade-off: you sell future tail-upside in exchange for guaranteed current income. The math favours covered calls in flat-to-moderately-bullish markets, hurts them in roaring bull markets (2017, 2020-21), and helps them in mild bear markets (premium buffers losses).
Buy-write indexes show covered calls match buy-and-hold long-term returns with materially less volatility. You\'re trading peak-bull-market upside for steadier monthly income — for most investors, an honest trade.
Strike + expiration selection
Two key choices. Strike: ATM strikes earn the most premium but get called away frequently (50%+ probability). OTM strikes (3-10% above current) earn less premium but let you keep more upside. Many writers target 30 delta strikes — roughly 30% probability of being called, balancing income with capital retention. Expiration: weekly options offer more frequent income but more transaction costs and assignment risk. Monthly options (third Friday) are the standard. LEAPS (1-2 year) lock in premium but tie up capital. Most income strategies use 30-45 day options ("monthlies") for the best risk/return.
ASEAN covered call markets
For ASEAN retail investors: Singapore traders use Interactive Brokers / Tiger Brokers for US-listed covered calls (most liquid market globally). Local SGX options have limited retail-friendly access. Hong Kong: HKEX has deep individual-stock + HSI options, accessible via Futu, Tiger HK. Excellent for covered calls on Tencent, Alibaba HK, Meituan. Australia: ASX 24 listed options on ASX 200 stocks; reasonable retail access through ASX brokers. Malaysia, Indonesia: limited local options markets — most retail covered-call writing happens offshore via US brokers. Across all markets, the strategy mechanics + this calculator are identical.
10 Things to Know About Covered Calls
Long 100 shares + short 1 call = covered call. Each contract requires 100 shares of underlying.
CBOE BXM index (Buy-Write Monthly) systematically writes ATM calls on S&P 500. Long-run returns ≈ S&P with less volatility.
Most popular options strategy among retirees and income investors. The "wheel strategy" cycles between cash-secured puts and covered calls.
OTM strikes: less premium but capital appreciation preserved. ATM strikes: max premium but high assignment probability.
Most writers target 30-45 day options (monthlies). Best balance of premium decay + capital efficiency.
Tax: assignment = stock sale at strike. Premium counted as short-term gain if call expires worthless. Cost basis adjusted if assigned.
Risk = limited downside protection. Premium offsets ~1-3% of stock decline; bigger drops still hurt.
Strategy excels in flat-to-moderately-bullish markets. Underperforms buy-and-hold in roaring bull markets.
Wheel strategy: sell CSPs to acquire shares cheap, then write covered calls. Repeat. Popular with WallStreetBets / retail income communities.
Annualised returns of 10-25% are typical with sustained covered call writing on liquid mid-cap stocks. Higher IV underlyings = higher yields.
Frequently asked questions
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Not inherently — if the strike is above your cost basis, being called away means you locked in capital gain + premium income. The only "regret" comes if the stock continues running above strike post-assignment. To avoid: pick longer-dated calls or higher strikes; or "roll up and out" before assignment (buy back the short call, sell a higher-strike longer-dated call simultaneously). Many writers accept assignment when it happens, take the gain, and start a new wheel.
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For covered calls: ITM (In-The-Money): strike below current stock price — high premium (mostly intrinsic value), near-certain assignment, "deep call-write" strategy. ATM (At-The-Money): strike ≈ current price — moderate premium, ~50% assignment probability. OTM (Out-of-the-Money): strike above current price — lower premium, preserves upside, ~30% or lower assignment probability. Most income writers use OTM (5-10% above current) for the best premium-to-risk ratio.
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Dividends are a key risk: if the stock\'s dividend on ex-date approaches or exceeds the call\'s time value, the call holder may exercise EARLY to capture the dividend (you\'d be called away before expiry, losing the dividend you\'d otherwise collect). Avoid covered calls expiring just after ex-date for high-dividend stocks. Check ex-dividend calendar before each write. Particularly important for: dividend aristocrats with 4%+ yields, REITs, banks during peak earnings season.
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A combined cycle: (1) Cash-Secured Put: sell a put on a stock you want to own at a price below current. Collect premium. If assigned, you buy 100 shares at the put strike. (2) Covered Call: now that you own 100 shares, sell calls above your cost basis. Collect premium. If assigned, you sell shares at the call strike. (3) Repeat: with the sale proceeds, sell another CSP. The wheel earns premium continuously whether you own the shares or hold cash. Popular on r/options and WallStreetBets income subreddits.
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US tax treatment: Premium: not taxed when received. If the call expires worthless, premium becomes short-term capital gain (ordinary income tax rate) in the expiration year. If the call is assigned, premium is added to the stock sale proceeds for capital gain computation. Qualified covered call rule: writing certain "deep ITM" calls can suspend the holding period for long-term gain treatment of the underlying stock — avoid deep-ITM calls if you need long-term gain treatment on the stock. Consult a tax professional for complex situations. ASEAN: tax treatment varies; in Singapore most retail options gains are tax-free as capital gains, but check with a local accountant.
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Ideal characteristics: (a) Liquid options chain — tight bid-ask spreads, high open interest. SPY, QQQ, AAPL, MSFT, AMZN all qualify. (b) Moderate volatility — too low = small premium; too high = unstable underlying. IV rank 30-60 sweet spot. (c) Sideways or slowly trending stocks — you collect premium without missing big moves. (d) Dividend payers for total return enhancement. Worst candidates: pre-earnings volatile names (high IV but binary outcome risk), illiquid small-caps (wide spreads), pure momentum names (covered calls cap exactly what you bought them for).
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This calculator gives you the headline metrics — premium, breakeven, max profit, returns. A payoff diagram is a graphical view showing P&L at every possible stock price at expiration. For a covered call, the payoff is: linear loss below cost minus premium, kinked at strike (capped above strike at max profit). Both views complement each other — metrics for quick screening, payoff diagram for "what if stock moves N%" thinking. For multi-leg strategies (iron condor, butterfly), payoff diagrams become essential.
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Closing your current short call and opening a new one — usually further out in time and/or at a higher strike. Two common rolls: Roll up (higher strike, same expiry) — gives up some premium but raises the cap. Roll out (same strike, later expiry) — collects additional premium, extends time. Roll up and out (higher strike + later expiry) — most common defensive move when stock approaches strike. Rolling is most useful when the stock has rallied near your strike and you want to extend the position. Beware: rolling repeatedly can lock in increasing losses if the stock keeps running.
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No. Cost basis, strike, premium, days, share count — every input stays in your browser. The covered call computation runs as client-side JavaScript. Open DevTools → Network when you click Calculate and you\'ll see zero outbound requests.
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Standard reference: McMillan L., Options as a Strategic Investment, Ch.2 — covered call fundamentals + variants. Natenberg S., Option Volatility & Pricing, for the volatility framework. CBOE Education Center (cboe.com/learn) has free covered call basics. tastytrade (tastytrade.com) hosts free podcast + research on income strategies including the wheel. For ASEAN-specific: HKEX Investor Education covers HSI options strategies in English + Chinese.
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