Accountants and bookkeepers record transactions as debits and credits while keeping the accounting equation constantly in balance. This process is called double-entry bookkeeping. Double-entry bookkeeping records both sides of a transaction — debits and credits — and the accounting equation remains in balance as transactions are recorded.For example, if a transaction decreases cash $25,000, then the other side of the transaction is a $25,000 increase in some other asset, or a $25,000 decrease in a liability, or a $25,000 increase in an expense (to cite three possibilities).
This illustration summarizes the basic rules for debits and credits. By long-standing convention, debits are shown on the left and credits on the right. An increase in a liability, owners’ equity, revenue, and income account is recorded as a credit, so the increase side is on the right. The recording of all transactions follows these rules for debits and credits.
Notice the horizontal and vertical lines under the accounts in the illustration above. These lines form the letter “T.” Although the actual accounts maintained by a business don’t necessarily look like T accounts, accounts usually have one column for increases and another column for decreases. In other words, an account has a debit column and a credit column. Also an account may have a running balance column to continuously keep track of the account’s balance.