Enter the 1099-B exactly as it is reported on your form. After you have entered purchase price, sale price, etc., there is a box for Sale Category. If there is no purchase price, then the sale category is E, long-term noncovered. Click on one of the blue boxes under "If you have additional info..." so that you can write in the Date acquired (your mother's date of passing) and the Cost or other basis. Be sure to check the box for "This item was inherited." Inherited securities are always long-term.
