I should add to this, even though the broker reports the cost basis, be proactive in verifying that it is correct. For reasons I can't comprehend, ETrade repor

I should add to this, even though the broker reports the cost basis, be proactive in verifying that it is correct. For reasons I can't comprehend, ETrade reports the costs basis wrong every single year on all my RSU and ESPP sold shares. They do issue a supplemental report which has all the correct info, but the 1099-B has it wrong. It is maddening. I need to send both the 1099 and the supplemental doc to my CPA so things are accounted correctly, otherwise I'd pay a lot more taxes due to ETrade errors. All other brokers I deal with do it correctly.