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@Eile wrote:

I just put in a cost basis of 0.


That would be the correct treatment. The dates need to be the opening date for "acquired" and the expiration date for "sold" or there will be issues with TurboTax. The important thing is to make sure the transaction is classified as short-term.

 

https://www.irs.gov/publications/p550#en_US_2017_publink100010630