some brokerages cut off importing for prior years.
you do not need to enter every single transaction. on the 1099-B there should be up to 6 codes for the type of transactions
a) - short-term proceeds and basis reported to IRS
b) - short-term proceeds but not basis reported to IRS
c) - short term neither proceeds nor basis reported to IRS
d,e, f same as a,b, and c but for long term transactions
for each of these, you can just enter a total on the 1099-B worksheet
you need to enter M as the adjustment code and 0 for adj amount. (M tells the IRS there are multiple transactions on that line and detail is provided elsewhere)
since you can not e-file 2019, you can attach a copy of the 1099-B to the return and mail it in. be sure to use a method where you can either track the return or get proof of delivery
