Thus
the concept of a 'trial balance' is born: If one lists and adds up all the
debit(+) balances from the pages in the ledgers, the total should be the same
as the sum of the list of all the credit(-) balances from those books.
This check is the primary purpose of a trial balance. In a single column, of
course, the debits and credits will therefore sum to zero, and this is
sometimes how a trial balance is presented, rather than the more traditional
2-column 'debit/credit' approach. So, the art of double-entry bookkeeping
is to keep the debits and credits in balance; if you make a debit entry you
must make an opposing credit entry of the same value.
The (positive) debits in
this system of accounting are the assets and the expenses, the (negative)
credits are the liabilities and the
income. At first, these pairings seem strange, but they work to keep the books
in balance. This is because the income less expenses makes up the 'Profit
and Loss Account' section of the trial balance, and the assets less liabilities
make up the 'Balance Sheet' section of the trial balance. For example, if you
sell some goods to a customer for £100, that you purchased from a supplier for
£80, the double-entry is as follows:
Debit : Purchases (in
the nominal ledger) £80
Credit : Supplier account (in the
purchase ledger) £(80)
Debit : Customer account (in the sales
ledger) 100
Credit
: Income account (in the nominal ledger) £(100). The trial balance then extracted
from this trader's ledger books is as follows: Income -
Sales £(100) Expenses - Purchases of goods £80
Assets - Debtors in sales ledger : £100 Liabilities -
Creditors in purchase ledger : £(80)Once the customer has paid for the goods,
and the supplier has in turn been paid, the entries required are:
Debit : Bank account
£100
Credit : Customer account (in the sales ledger) £(100)
Debit : Supplier account (in the purchase ledger) £80
Credit : Bank account £(80)The trial balance then extracted from this
trader's ledger books is as follows:
Income - Sales
£(100) Expenses - Purchases of goods £80
Assets - Bank account (in the nominal ledger) : £20
Assets - Debtors in sales ledger : £nil Liabilities -
Creditors in purchase ledger : £nilAs can be seen, each entry 'balances' in its
own right (and is called a 'journal entry' to the ledgers), and therefore a
'trial balance', of equal total of debits and total of credits, is always
maintained (summing to zero).In this example, the profit of the business is
£(20), measured as a (negative) net credit amount and this is represented by
net assets of £20 held in the business.
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