Covered calls are a popular options trading strategy used by UK retail traders to generate additional income from existing stock holdings, particularly those with high dividend yields such as FTSE 100 shares. By selling call options on dividend-paying stocks, traders collect premium from the buyer while still benefiting from the underlying stock's dividend payments—provided they avoid assignment before the ex-dividend date. A trader holding 1,000 shares of British American Tobacco at £34.50, for example, could sell 10 call options with a strike price of £35.00, expiring in 6 weeks, collecting £0.50 per share or £500 in total.
Understanding Covered Calls and Dividend Assignment Risk
When a trader writes a covered call on a dividend-paying stock, they're obligated to sell the underlying shares at the strike price if the option is exercised. If the stock goes ex-dividend before the option expires and assignment occurs, the trader misses the dividend payment—the new owner receives it instead. Careful position management becomes essential, factoring in ex-dividend dates of underlying stocks. A trader with a covered call on Vodafone expiring in 3 weeks after the ex-dividend date might close the position or roll it to a later date to avoid missing the dividend.
Identifying Ex-Dividend Dates and Managing Assignment Risk
Ex-dividend dates for UK stocks are announced by companies and available through the London Stock Exchange or financial data providers. Traders can use this information to plan covered call trades strategically. A practical approach is to avoid writing covered calls expiring within 2 weeks of the ex-dividend date, reducing assignment risk significantly. For instance, writing a call on HSBC expiring on 5 July rather than 22 June—when the ex-dividend date is 20 June—lowers the likelihood of assignment before the dividend payment.
Covered Call Strategies to Minimise Assignment Risk
Several strategies reduce assignment risk on covered calls for dividend-paying stocks. Writing calls with a higher strike price decreases assignment likelihood but also reduces premium collected. A trader holding 1,000 shares of GlaxoSmithKline at £16.50 might write 10 call options with a £18.00 strike instead of £17.00 to lower assignment risk. Alternatively, writing calls with shorter expiration dates—one to two weeks—generates lower premiums but reduces the time window for unfavourable stock movement.
Rolling Covered Calls to Avoid Assignment
Rolling a covered call means closing the existing position and writing a new option with a later expiration date. This approach works well when a call approaches expiration and risks exercise. If a trader has written a call on Royal Dutch Shell expiring in 1 week with the stock trading above the strike price, rolling it out 3 weeks gives the stock price time to decline below the strike. The new call can use the same or higher strike price, depending on market outlook.
Covered calls add genuine value to a trader's approach, creating additional income from existing holdings. Strategic position management and awareness of ex-dividend dates help traders minimise assignment risk and optimise returns. Our Dividend Assignment Risk Tool can help you determine the optimal covered call strategy for your portfolio.