After you file


@ben_g wrote:

Got it, thanks. 

 

Ok so can I amend my 2018 1040 with a 1040-X and include a form 9849 and 1040-B with the original documents?


Yes, you can enter the investment sale using the Form 1099-B received from the broker in the amend program.  The program will create a Schedule D and a Form 8949 to report the sale on your tax return.