Good day Cindy5172,
I am sorry for the loss of your mom.
If the stock was sold through the estate, tax, if any would be the responsibility of the estate. The filing requirement for an estate return, Form 1041, is $600 of income (the proceeds of the sale less the basis). Keep in mind, the basis of the stock would be the value at the date of death; which usually results in a higher basis and less net income.
If the stock was distributed to you as a beneficiary and sold by you personally, you would have to include the net gain or loss from the sale on you personal income tax return.
Thank you for reaching out to the TurboTax Community.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"