Let's say I have a bull call spread and I get assigned. The option is american style and physically settled. Do I physically need the money to purchase the underlying at the bought call strike? For example, Let's say SPY is at $98 and I buy a call contract at strike $100, and sell a call contract at strike $101 (same exp). The spread costs me $50 (or .50 per share). Now, SPY goes to $102 and I get an early assignment. Do I physically need 10k to exercise my purchased call? Or can I somehow simultaneously exercise my bought call and sell the shares to the sold call and net the $50? The difference is, if I physically need 10k, then my yield is .5%. If I don't need 10k, then my yield is 100%.