In years/decades past figuring out cost basis through options and acquisitions could be a real nightmare. To be honest there have been times when I’ve thrown my hands up and just come up with a plausible average.

But as I wrote, I think things are mostly pretty good these days. But who knows with things like RSUs you have limited visibility into.

We both work at big techs , so first world problem. But her company grants RSUs and sells stock to cover income tax, mine gives less stock and grants cash to cover taxes instead. Which is why I was surprised she was getting 1040s at all. But the stock is sold to cover tax, since a stock grant is taxed as ordinary income, that this generates a 1040 with a cost basis of zero is crazy.