PSA For Option Assignment on Margin Accounts

I received an email yesterday morning (3/10 at 6:30am) from Schwab informing me that some put contracts I sold (expiration 3/13) were exercised early. I was expecting assignment. As soon as the market opened, I sold SGOV to cover the cost of the shares. I opened, and closed that day with a positive balance - or so I thought. This morning I received an email saying that a margin loan had been initiated. After digging into this, I discovered that, while the assignment only hit the ledger at 6:50am on the 10th, apparently the assignment itself happened after market close, on the 9th. Which made the 10th T+1 from their perspective, and since my SGOV sale didn't clear until the 11th, I got hit with margin interest. The amount wasn't significant, but it could have been (e.g., if a large position was assigned after hours on a Friday, and account not funded until Monday.) Many of you may be aware of this already, and not sure if Schwab does things different than others. but I certainly learned something new today. **Lesson here: if you're expecting assignment, you'll want to have the account pre-funded several days prior to expiration to avoid margin interest.** https://preview.redd.it/aoyndkop6hog1.png?width=1200&format=png&auto=webp&s=aa91a49ebb375a02944d8062ad6b4f510bade3cb