## What is 'Double Entry'

Double entry, a fundamental concept underlying present-day bookkeeping and accounting, states that every financial transaction has equal and opposite effects in at least two different accounts. It is used to satisfy the equation Assets = Liabilities + Equity.

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## BREAKING DOWN 'Double Entry'

In the double-entry system, transactions are recorded in terms of debits and credits. Since a debit in one account offsets a credit in another, the sum of all debits must equal the sum of all credits. The double-entry system of bookkeeping or accounting makes it easier to prepare accurate financial statements and detect errors.

## Types of Accounts

Bookkeeping and accounting are ways of measuring, recording, and communicating a firm's financial information. A business transaction is an economic event that is recorded for accounting/bookkeeping purposes; in general terms, it is a business interaction between economic entities, such as customers and businesses or vendors and businesses.  Under the systematic process of accounting, these interactions are generally classified into accounts. There are seven different types of accounts that all business transactions can be classified: assets, liabilities, equities, revenue, expenses, gains, and losses. Bookkeeping and accounting track changes in each account as a company continues operations.

## Debits and Credits

Debits and credits are essential to the double entry system.  In accounting, debit refers to an entry on the left side of an account ledger, and credit refers to an entry on the right side of an account ledger.  To be in balance, the total of debits and credits for a transaction must be equal.  Debits do not always equate to increases and credits do not always equate to decreases.  A debit may increase one account while decreasing another.  For example, a debit increases asset accounts but decreases liability and equity accounts, which supports the general accounting equation of Assets = Liabilities + Equity.  On the income statement, debits increase the balances in expense and loss accounts, while credits decrease their balances.  Debits decrease revenue and gains account balances, while credits increase their balances.

## Double Entry Example

A bakery purchases a fleet of refrigerated delivery trucks on credit; the total credit purchase was \$250,000.  The new set of trucks will be used in business operations and will not be sold for at least 10 years, their estimated useful life.  To account for the credit purchase and new inventory, entries must be made in their respective accounting ledgers.  Because the business has accumulated more assets, a debit to the inventory account for the cost of the purchase (\$250,000) will be made.  To account for the credit purchase, a credit entry of \$250,000 will be made to accounts payable.  The debit entry increases the inventory asset balance and the credit entry increases the accounts payable liability balance by the same amount.  Double entries can also occur within the same class, such as assets.  If the bakery's purchase was made with cash, a credit would be made to cash and a debit to inventory, still resulting in a balance.

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