Buying Power Requirement for Covered Calls
Covered calls can be sold in a margin and cash account
The buying power requirements for a covered call is the initial and maintenance requirements that apply to the long stock or ETFs. As a result, there is no additional requirement for the short call. Your account must have 100 shares per call sold not to require any additional buying power.
Please note: If the call is in-the-money, the stock/ETF is treated as if it was valued at the strike price.