Stash is not on the list of institutions or services that have files that can be imported into TT.
you'll need to download the file(s). however, you don't need to enter each transaction. you can enter summary totals for each line on 1099-b worksheet. then you can either
mail your return with a print out of the downloaded file(s)
or complete form 8453 and e-file.
mail Form 8453 to the IRS with the printout within 3 business days after
you have received acknowledgement from your
intermediate service provider and/or transmitter that the
IRS has accepted your electronically filed tax return. If
you don’t receive an acknowledgement, you must contact
your intermediate service provider and/or transmitter.
Mail Form 8453 to:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
make sure box 8949 is check on the form.
