Can I claim a tax deduction on stock loss when redeemed through sale?

A loss means that the stocks were sold for less than their basis (usually what you paid for them). You need to know what you paid for them and at what price they were sold. You also need to know whether the stocks are short-term (prior to the sale, you had them for one year or less) or long-term (more than one year). These losses are deductible and are reported on Schedule D(Capital Gains and Losses).