Common Mistakes

Common Mistakes: The Trial Balance

The Trial Balance checks the arithmetic accuracy of double entry and forms the basis for preparing the Financial Statements. The common mistakes below help you avoid the errors that most often cost marks in Chapter 6.

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Function and format of the Trial Balance

Mistake: Assuming a balanced Trial Balance proves the ledger has no errors. Avoid it by remembering its function: it only checks the arithmetic accuracy of double entry (total debits = total credits) and helps in preparing the Financial Statements; it does not guarantee every transaction was recorded correctly.
Mistake: Incomplete title or wrong date wording. Avoid it by writing the three-line heading: the business name, the words 'Trial Balance', and 'as at' a specific date (e.g. as at 31 December 2025), not 'for the year ended' as used in the Income Statement.
Mistake: Missing a folio column or leaving the debit/credit columns unlabelled. Avoid it by ruling columns for Particulars, Folio, Debit (RM) and Credit (RM), and transferring balances following the Accounting Cycle from Source Documents through to the ledger.

Placing balances in the wrong column

Mistake: Putting assets such as motor vehicles or trade receivables in the credit column. Avoid it by remembering assets and expenses carry debit balances (balance b/d on the debit side of the ledger), while liabilities, capital and revenue carry credit balances.
Mistake: Confusing Opening Inventory with Closing Inventory. Avoid it by remembering only Opening Inventory appears in the Trial Balance (a debit balance); Closing Inventory is valued after the balance date and is NOT included in the Trial Balance under the periodic inventory system.
Mistake: Misplacing returns (Purchases Returns vs Sales Returns). Avoid it by checking: Purchases Returns (returns outwards) has a credit balance, while Sales Returns (returns inwards) has a debit balance, i.e. opposite to Purchases and Sales respectively.
Mistake: Treating Drawings as a credit balance because it reduces capital. Avoid it by remembering Drawings is recorded as a debit balance in the Trial Balance; it is only deducted from capital when preparing the Statement of Financial Position.

Errors that do NOT affect the balancing

Mistake: Stopping all checking the moment the Trial Balance balances. Avoid it by realising that several errors still leave it balanced. For example, an error of omission (a transaction not recorded at all) reduces both columns equally.
Mistake: Believing that recording in the wrong account will always be detected. Avoid it by knowing an error of commission (right amount but to the wrong account of the same class, e.g. Ali's account instead of Abu's) and an error of principle (to the wrong class of account) do not upset the balance.
Mistake: Thinking every numerical error will stand out. Avoid it by understanding an error of original entry (wrong amount posted to both accounts), a complete reversal of entries (debit and credit swapped), and compensating errors (two opposite errors of equal value) all still let the Trial Balance balance.

Transferring balances from the Cash Book and Petty Cash Book

Closing inventory and its link to the Financial Statements

Mistake: Confusing the periodic system with the perpetual system. Avoid it by remembering the periodic system determines closing inventory value by a physical count at period-end, while the perpetual system updates the inventory record after every transaction using inventory cards.
Mistake: Forgetting to record closing inventory in the General Journal and ledger. Avoid it by making this entry: debit the Closing Inventory account and credit the Income Statement (Cost of Sales), so that closing inventory exists as an asset and reduces the cost of goods sold.
Mistake: Putting closing inventory in only one statement. Avoid it by remembering the relationship: under the periodic system, closing inventory is deducted in the Cost of Sales working in the Income Statement AND is shown as a current asset in the Statement of Financial Position.
Mistake: Valuing closing inventory at selling price. Avoid it by valuing it at the lower of cost or net realisable value, so that profit is not overstated and the asset value is not inflated.

Simple Trial Balance example (Closing Inventory excluded)

Particulars	Debit	Credit
Cash	5,000
Opening inventory	3,000
Purchases	8,000
Furniture	10,000
Trade receivables	6,000
Capital		16,000
Sales		12,000
Trade payables		4,000
Total	32,000	32,000

Note that Opening Inventory sits in the debit column and Closing Inventory is not listed. Figures are illustrative only.

Does a balanced Trial Balance mean there are no errors at all?

No. A Trial Balance only proves that total debits equal total credits. Errors such as omission, commission, principle, original entry, complete reversal and compensating errors still allow it to balance, so balancing is not absolute proof of accuracy.

Why does Closing Inventory not appear in the Trial Balance?

Under the periodic inventory system, the closing inventory value is only determined by a physical count after the balance date, i.e. after ledger balances have been extracted. Therefore only Opening Inventory (a debit balance) sits in the Trial Balance; closing inventory is recorded later via the General Journal for the Income Statement and the Statement of Financial Position.

How does closing inventory link the Income Statement to the Statement of Financial Position?

The same closing inventory figure is used twice: it is deducted in the Cost of Sales working in the Income Statement (lowering cost and raising gross profit), and at the same time it is shown as a current asset in the Statement of Financial Position. This is the linking relationship under the periodic inventory system.

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