Accounts payable stanowią podgrupę liabilities. Liabilities jest terminem znacznie szerszym i oprócz AP obejmuje także Notes payable, Interest payable, itd.

http://www.investorwords.com/51/accounts_payable.html

Accounts payable - Money which a company owes to vendors for products and services purchased on credit. This item appears on the company's balance sheet as a current liability, since the expectation is that the liability will be fulfilled in less than a year. When accounts payable are paid off, it represents a negative cash flow for the company.

http://en.wikipedia.org/wiki/Liability_(financial_accounting...

In financial accounting, a liability is defined as an obligation of an entity arising from past transactions or events, the settlement of which may result in the transfer or use of assets, provision of services or other yielding of economic benefits in the future. A liability is defined by the following characteristics:

- Any type of borrowing from persons or banks for improving a business or personal income that is payable during short or long time;
- A duty or responsibility to others that entails settlement by future transfer or use of assets, provision of services, or other transaction yielding an economic benefit, at a specified or determinable date, on occurrence of a specified event, or on demand;
- A duty or responsibility that obligates the entity to another, leaving it little or no discretion to avoid settlement; and,
- A transaction or event obligating the entity that has already occurred.