Working capital is important because it is necessary for businesses to remain solvent. In theory, a business could become bankrupt even if it is profitable. After all, a business cannot rely on paper profits to pay its bills—those bills need to be paid in cash readily in hand. Say a company has accumulated $1 million in cash due to its previous years’ retained earnings. If the company were to invest all $1 million at once, it could find itself with insufficient current assets to pay for its current liabilities.