If your broker does not provide for import of 2018 stock trades into your 2018 return. then you will have to download the 1099B. you will still have to enter in the 1099B worksheet the totals for each of the different types. usually denoted as A - short-term sales price and basis reported to irs
b- short-term sales price but not basis reported
c - short-term neither sales price nor basis reported
there are similar types d,e and f for long term trades
you'll have to mark each type in box 18a as M and 18b as 0. this tells the IRS that the totals consist of multiple trades. you'll also have to include a copy of the 1099B with the mailed return
use a mailing method where you get proof of delivery.
