Expense: An expense is the cost incurred by a business for the consumption of goods or services in the process of generating revenue. Expenses are recorded on the income statement and contribute to a loss.
Impairment: Impairment is the recognition that the value of an asset has decreased, often due to obsolescence, damage, or changes in market conditions. Impairment losses are recorded on the income statement.
Bad Debt: Bad debt refers to accounts receivable that a business is unable to collect from customers. The write-off of bad debt is recorded as a loss on the income statement.