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Part B Accounting systems and accounts preparation ⏐ 13: Control accounts 201
3.1 Why control accounts are kept
(a) They provide a check on the accuracy of entries made in the personal accounts in the sales and purchase
ledgers. It is very easy to make a mistake in posting entries. Figures can get transposed. Some entries can
be omitted altogether, so that an invoice or a payment does not appear in a personal account. Comparison
of the balance on the receivables control account with the total of individual personal account balances in
the sales ledger will show if any errors have occurred. Similarly the payables control account provides a
check on the purchase ledger.
(b) The control accounts also assist in the location of errors. If a clerk fails to record an invoice or a payment
in a personal account, it would be difficult to locate the error or errors at the end of a year. By using the
control account, a comparison with the individual balances in the sales or purchase ledger can be made
daily or weekly and the error found much more quickly.
(c) Where there is separation of bookkeeping duties, the control account provides an internal check. The
person posting entries to the control accounts will act as a check on a different person(s) posting entries
to the sales and purchase ledger.
(d) Control accounts provide the total receivables and payables balances more quickly for producing a trial
balance or statement of financial position.
In computerised systems, it may be possible to use sales and purchase ledgers as part of the double entry without
needing separate control accounts. The sales or purchase ledger printouts provide the list of individual balances, as well
as a total (control account) balance.
4 The operation of control accounts
Entries are posted individually from the books of prime entry to the individual receivable and payable accounts. These
entries are also posted in total to the receivables and payables control account. Cash books and day books are totalled
periodically and the totals are posted to the control accounts.
4.1 Example: accounting for receivables
The following example shows how transactions involving receivables are accounted for. Reference numbers are shown
in the accounts to illustrate the cross-referencing that is needed.
(a) SDB refers to a page in the sales day book.
(b) SL refers to a particular account in the sales ledger.
(c) NL refers to a particular account in the nominal ledger.
(d) CB refers to a page in the cash book.
At 1 July 20X2, the Outer Business Company had no receivables at all. During July, the following credit sale transactions
occurred.
(a) July 3 invoiced A Arnold for the sale on credit of hardware goods: $100.
(b) July 11 invoiced B Bagshaw for the sale on credit of electrical goods: $150.
(c) July 15 invoiced C Cloning for the sale on credit of hardware goods: $250.
(d) July 10 received payment from A Arnold of $90, in settlement of his debt in full, having taken a permitted
discount of $10 for payment within seven days.
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