Thursday, July 21, 2011

Zero Sum

All transaction should balance to zero. By this I mean that the values saved to the accounts for a transaction should add up to zero. The debit(DR) values will match the credit(CR) values. See here for more on DR/CR.


A sales transaction for €121.00 can be broken down as €100.00 for the value of goods sold and €21.00 tax. The customer owes €121.00.

In accounting terms this will be recorded as

Detail

DR

CR

Value of Sales

100.00

Tax due by you

21.00

Value of Customer

121.00

Total-Both sides match

121.00

121.00

All transactions will follow this principle. It also acts as a built-in integrity check. If the DR is positive and the CR negative, at any stage the entire set of transactions will add up to zero.

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