Just an update here to say that apparently Schwab DOESN'T know how to calculate wash sale losses correctly.
I had a wash sale loss this year (2020) and Schwab calculated the incorrect deferred loss. The deferred loss on the 1099-B was exactly twice the correct amount. I've spoken to Schwab and they have acknowledged there was an error in their calculation.
I would guess that this wasn't a simple "one-off" error and I just happened to be the only unlucky individual in their universe of clients.
You might want to make your own calculations.
Tom Young
