A contingent liability is a possible debt or obligation that a bank or company might have to pay in the future — but only if a specific uncertain event actually happens. Think of it as a financial "what if."
Common examples in banking: a bank guarantee is a contingent liability — the bank promises to pay if the customer defaults. Pending lawsuits, disputed tax claims, and product warranties are also contingent liabilities. They sit in the footnotes of financial statements, not on the balance sheet.
Banks must disclose contingent liabilities under accounting standards (IAS 37). If the liability becomes probable and estimable, it moves to the balance sheet as a provision. If unlikely, it stays as a disclosure. Massive undisclosed contingent liabilities have sunk companies — like Enron.