Credit? From this point of view, an option is just an instrument like all others. It has a price (bid/ask) that changes continuously, and, therefore, your PNL changes continuously accordingly, depending on your current position. Also, your margin requirements will change continuously, depending on the underlying price. Look for instance at this option chart below, approaching expiry (please, ignore all the orders [dots] shown, which were my bot scalping) and imagine, in your case, only a unique sell at the beginning. So depending on the option price, your PNL would change accordingly until the option expires: ES FOP 20220429 2900 P GLOBEX 50 E-mini S&P 500 [EWJ2 P2900, 524261369, mult: 50] In this case, the PNL history is as follows (this will expire in 17 days and is still running): Got it?