How Expenses Affect Profit & Loss Revenue and gross profit do not tell the full story. Operating expenses reduce the amount the business actually keeps. In simplified terms: Net profit or loss = gross profit − recorded operating expenses RepairNest POS uses the expense records available to the selected Profit & Loss period. If rent, payroll, utilities, or another cost is missing, the net result can appear stronger than reality. If an expense is duplicated or dated incorrectly, the report can understate performance. Complete, categorized expense records make Profit & Loss reporting more useful for management decisions.