Revise Trial balance for Cambridge 9706 (1.4.2)

A trial balance is a list of all the balances in a business's general ledger accounts at a specific point in time. Its primary purpose is to verify the arithmetical accuracy of the double-entry bookkeeping system. It is prepared by listing all accounts with debit balances in one column and all accounts with credit balances in another. According to the fundamental principle of double-entry, the total of the debit column must equal the total of the credit column. If they agree, the ledgers are said to be 'in balance'. It is an essential internal document prepared at the end of an accounting period, forming the bridge between the ledger accounts and the preparation of the final financial statements.

When the trial balance totals do not agree, it indicates one or more errors in the ledger accounts. These errors disrupt the equality of debits and credits. Common examples include a single-sided entry (e.g., a debit is posted but the corresponding credit is omitted), transposition errors (where digits are reversed, e.g., £89 posted as £98), casting errors (an incorrect addition of a ledger account), or posting unequal amounts. To proceed with preparing draft financial statements, the difference is temporarily placed into a suspense account. This is a temporary ledger account created specifically to hold the difference, thus forcing the trial balance to balance. The entry in the suspense account is made on the side with the lower total. For example, if debits are $50,100 and credits are $50,000, a credit entry of $100 is made to the suspense account. The existence of a suspense account balance is a clear signal that an investigation is required to find and correct the underlying error(s). Once all errors are rectified, the suspense account balance will be reduced to zero.

More deceptive errors are those that do not affect the agreement of the trial balance. Although total debits still equal total credits, the accounts are incorrect. This is a major limitation of the trial balance. Correction of these errors is done via a journal entry between the affected accounts, without using the suspense account.

A common exam requirement is to calculate the corrected net profit after identifying and correcting errors. This involves starting with the original (incorrect) draft profit and adjusting it for the effect of each correction. You must analyse how each correction impacts revenues and expenses.

• If an expense was overstated (e.g., an asset purchase was expensed), correcting it will decrease expenses and increase profit.
• If an expense was understated (e.g., a repair cost was omitted), correcting it will increase expenses and decrease profit.
• If income was understated, correcting it will increase profit.
• If income was overstated, correcting it will decrease profit.

Errors that only affect statement of financial position accounts (e.g., an error of commission between two trade receivables) will have no impact on profit.