How It Works
For example, let's say Company XYZ manufactures bicycles and sells them through retail stores. Once the retailer receives the bicycles it has 90 days to pay Company XYZ. Company XYZ records the amount due as "accounts receivable" on the balance sheet and recognizes the revenue. However, as the 90 day due date passes, Company XYZ realizes the retailer is not ever going to make its payment.
Once it determines that it's a bad debt and won't be repaid, XYZ must make adjustments to its financial statements. Under accrual accounting, since revenue was already credited for the sale of the bicycles, Company XYZ must adjust its income statement for the bad debt. Therefore, Company XYZ has accounts for both allowance for doubtful accounts (ADA) and bad debt expense, which reduces the amount of net income reported by Company XYZ.
Companies have bad debt expense accounts because it is inevitable that some customers won't pay for the goods and/or services provided, usually occurs because the debtor declares bankruptcy.
For individuals, bad debt refers to debt that is not beneficial in the long run. While a mortgage is a form of debt, it is not considered bad debt, because the borrower has the potential to actually profit from an increase in their home's value. However, credit card debt and other forms of consumer debt are called bad debts, because they are debts taken on for consumption. Consumer goods almost always go down in value over time, so it's common to owe more on a credit card than the purchased goods are actually worth.