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The system is based on the concept that a business can be described by a number of different variables or accounts, each describing an aspect of the business in monetary terms. Every transaction has a 'dual effect'—increasing one aspect and decreasing another, in such a way that all of the different variables always sum to zero. This is illustrated below.
Buying an asset:
Selling merchandise on credit:
Paying a trade creditor:
For each transaction there will be a debit and a credit. An increase in any of the following will result in a debit:
An increase in any of the following will result in a credit:
An increase in a debit item must be accompanied by either an increase in a credit item or a decrease in another debit item. An increase in a credit item must be accompanied by either an increase in a debit item or a decrease in another credit item.
Credit and debit items are later summarised in a trial balance which is a list of all the debit and credit balances. The trial balance acts as a self checking mechanism for the correctness of entries in the individual accounts and also as a starting point for the preparation of the balance sheet and a profit and loss account.