Question
My 1099B has several lines with cost basis 0. Is it better to leave these at 0, or guess the cost? I can see a "deposit" amount on a statement so I assume that's the cost
Some of these were only held for ~4 days - acquired 1/24 sold 1/28 - as part of a managed brokerage account with my bank. I can see the date "received" (not purchased for some reason) and the "deposited" amount for each line - many of these it looks like the deposit amount is > than the sell amount, so it would be a loss, not a gain. I don't know if I should leave these at $0 knowing it's wrong and I'll end up paying taxes on "gains" that aren't accurate or if it's worse to try to guess what the cost basis actually was.
