Net Margin measures the percentage of sales left as net profit after operating costs, interest, tax and other expenses. In MSME underwriting, it is read along with financial statements, bank statements, GST data and existing obligations to judge cash-flow strength and repayment capacity. The trend is usually more important than one isolated number, because MSME financials can be affected by seasonality, accounting treatment and one-off events. For example, a falling margin despite rising sales may indicate pricing pressure, cost escalation or dependence on low-profit customers. It matters because financial interpretation can change the view on leverage, liquidity, profitability, debt-service ability and the borrower’s real operating strength. The common caution is to check calculation basis, period, exceptional items, related-party entries and consistency with GST, bank statement and audit data.