Have a Tax Question? Ask a Tax Expert
You would enter the totals in the proper places on the 8949 and in the description area you would indicate
"See Schedule Attached".
That is perfectly acceptable.
In many cases, although you won't find it anywhere, some professional Tax Preparers just enter the totals as noted above but instead of attaching all the 1099B data, they indicate "Details available upon request", and they do not attach the detail. This works a lot better now that the brokerage houses provide the cost information to the IRS. I suspect that they tend to accept this from Tax Preparers as they figure we have looked at the detail.
In the first instance above, you would attach the securities statements with the 1099B information as you asked.