The loss on each stock trade equals the amount you spent to buy it, which includes brokerage fees, minus the amount you received for selling it, less brokerage fees. For example, say you bought the stock for $800, sold it for $716 and paid $8 in broker fees on both trades. Your capital loss would be $100. A problem for traders trying to maximize their cash flow is the archaic IRS rule that caps your available deduction for a capital loss at $3000 in any given tax year. This maximum deduction is for This loss is limited to $3,000 per year, or $1,500 if married and filing a separate return. Carryover Losses. If a taxpayer’s total net capital loss is more than the limit they can deduct, they can carry it over to next year’s tax return. Long and Short Term. Capital gains and losses are either long-term or short-term.