How it works
A covered call overlay sells call options against shares you already own, collecting premium income from buyers who pay for the right to purchase your stock at a set strike price. You keep the premium whatever happens; the cost arrives in strong markets, where shares finishing above strike get called away at the strike and every dollar of rally above it belongs to the option buyer. The calculator prices the trade mechanically: premium per contract times contracts per year gives the income layer — 1.8% monthly on a $25,000 position is roughly $5,400 a year, a 21.6% gross yield that explains the strategy's popularity. Then it subtracts the honest offset: in periods assumed to finish above strike, price gains are treated as forfeited beyond the premium, dragging the blended expected return below plain buy-and-hold whenever markets rise steadily. Premium levels are anything but stable — they swell with implied volatility and collapse in quiet tapes, so treat the default figures as illustrative placeholders, adjust them to live option chains, and remember that assignment timing, early exercise and dividend dates add frictions no simple model captures.
Formula
Annual premium = value × premium%/period × periods/yr | Blended return ≈ premium yield + uncapped share × (price move + dividend yield)
Tips
- Sell calls only on positions you genuinely accept losing at the strike.
- Chasing fat premiums means chasing volatile stocks — the risks arrive bundled.
- Compare the premium against the strike distance; thin cushions rarely pay.
- In taxable accounts, called-away shares realize gains on the fund's schedule, not yours.
- Track outcomes over a full year — one lucky or unlucky month proves nothing.
Frequently asked questions
- How much income do covered calls generate?
- Roughly 1–2% of position value per monthly contract in normal volatility, which annualizes near 12–24% gross in busy markets and closer to 4–8% in calm ones. The catch is symmetric: those premiums are highest exactly when the stock can also rip past your strike, capping the very upside that funds long-term returns.
- What happens when a covered call is assigned?
- Your shares are bought at the strike price regardless of the higher market price — you receive the strike plus the premium already banked, and the rally above belongs to the buyer. Most brokers auto-exercise at expiration. You can roll the call before expiry to postpone assignment, paying debits that eat into collected premium.
- Are covered calls safer than just holding stock?
- Downside-only modestly: the premium cushions losses by its own amount, so a 10% drop with 1.5% collected nets −8.5%. They do nothing about serious declines, however, and they systematically cap recoveries and rallies. The strategy trades away the right tail of returns for a small, regular income stream — a reshaping, not a shield.
- Why do my covered call returns lag a bull market?
- Because the strategy structurally sells off the best days. In steadily rising markets most calls finish in the money, surrendering gains above strike, while in choppy or falling markets premiums shrink just as losses bite. Buy-write indexes have historically matched or trailed pure equity over full cycles, winning mainly on smoother — not larger — returns.
- Which stocks work best for covered call writing?
- Ideally large, liquid names you would happily sell at the strike, with active option chains and premiums worth collecting. High-volatility tickers pay more but assign more often and fall harder; ultra-low-volatility payers offer premiums too thin to matter. Many practitioners prefer writing calls on broad ETFs to spread single-company assignment surprises.