If you are entering information for the sale of stock you inherited, in the Date Acquired entry field for Form 1099-B Proceeds From Broker and Barter Exchange Transactions, enter the word "Inherited" instead of an actual date (you will still be allowed to e-file your return). The program will then compute the transaction as long term and properly report this on Schedule D Capital Gains and Losses as per IRS Instructions for Schedule D.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the webpage or document at the time it is accessed.