Yes, you would need to report the sale of a business asset even if you sold it at a loss. You already received a deduction for the price you paid for it, so now you will need to include the sale in your income.
As to your cost basis, if you already took a deduction for it, you will need to report that as $0. Depending on the type of item it was, it may not be that simple as you may have to recapture depreciation, but your basis will be reduced by the amount you already claimed.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"