Mark,
Yes, this was a multilot sale as you suggested. It is an ESPP where I buy stock every month and then sell several months worth of purchases a few times a year. In 2021, there were two sales, both of which included some wash sale amount. What I can't wrap my head around is why the wash sale amount is added as if it was a taxable gain if it is also added to the cost basis. In your example below, I am thinking the 1099-B should show a cost basis of $13,000 because the wash sale would be added to the basis of other shares. Maybe it is that I don't really understand what exactly the amount in box 1g represents. What would you expect to see on the 1099-B in your example?
