A trial balance that agrees shows one thing only: total debits equal total credits. It does not prove that every transaction was recorded, or that each one went to the right account at the right amount. This lesson closes trial balance and error limits by turning that limit into clear working and wording.
Exam questions may ask you to state what a balanced trial balance does not prove, or to assess a statement such as “the trial balance agrees, so the profit is correct”.
Why can an agreeing trial balance still hide errors?
The trial balance checks the equality of two totals. Several errors leave both totals unchanged or changed by the same amount.
In explaining an error that does not break equality you met the six types. Here the question is what follows from them: a balanced trial balance is a test the books can pass while still being wrong.
How to judge a claim about accuracy, step by step
- Identify the claim: “the accounts are correct”, “the profit is right” or “no errors were made”.
- Ask what the trial balance tested: only the equality of the totals.
- List the error types the test would miss.
- Give one concrete example from the situation if you can.
- Rewrite the claim so it says only what the evidence supports.
Worked example
Mawar Catering prepares this trial balance.
| Account | Debit (RM) | Credit (RM) |
|---|---|---|
| Equipment | 15,000 | |
| Inventory | 3,000 | |
| Trade receivables | 4,200 | |
| Bank | 6,100 | |
| Purchases | 12,400 | |
| Wages | 8,000 | |
| Gas | 1,600 | |
| Drawings | 4,000 | |
| Capital | 30,000 | |
| Sales | 22,800 | |
| Trade payables | 1,500 | |
| Totals | 54,300 | 54,300 |
The columns agree. A review then finds four errors.
- Commission: RM 320 of gas was debited to Wages.
- Principle: an oven costing RM 1,800 was debited to Purchases.
- Omission: a credit sale of RM 700 was left out of both books.
- Compensating: Wages and Sales were each overcast by RM 250.
The corrected balances are:
| Account | Debit (RM) | Credit (RM) |
|---|---|---|
| Equipment (15,000 + 1,800) | 16,800 | |
| Inventory | 3,000 | |
| Trade receivables (4,200 + 700) | 4,900 | |
| Bank | 6,100 | |
| Purchases (12,400 − 1,800) | 10,600 | |
| Wages (8,000 − 320 − 250) | 7,430 | |
| Gas (1,600 + 320) | 1,920 | |
| Drawings | 4,000 | |
| Capital | 30,000 | |
| Sales (22,800 + 700 − 250) | 23,250 | |
| Trade payables | 1,500 | |
| Totals | 54,750 | 54,750 |
Check: debit 16,800 + 3,000 + 4,900 + 6,100 + 10,600 + 7,430 + 1,920 + 4,000 = 54,750. Credit 30,000 + 23,250 + 1,500 = 54,750.
Effect on profit: the commission error changes no total expense. The oven was charged as an expense, so profit was understated by RM 1,800 before depreciation. The omitted sale understated profit by RM 700. The compensating error moved expenses and sales by the same amount, so profit did not change. In total, profit was understated by 1,800 + 700 = RM 2,500, yet the first trial balance agreed.
A fair conclusion is: the trial balance agreed, which shows debits equal credits, but it did not detect these four errors. For scale, the omitted RM 700 sale is about 3.1% of recorded sales of RM 22,800.
The mistake to watch for
A common exam slip is to over-claim from the agreement.
Mistaken conclusion: “The trial balance agrees, so there are no errors in the ledger and the profit is correct.”
The student has read equality of totals as a check on every posting.
A better conclusion names the limit: “The trial balance agrees, so debits equal credits. Errors of omission, commission, principle, original entry, compensating errors and reversals would not be revealed, so the profit could still be wrong.”
Check yourself
Try these on paper, then open each answer.
1. True or false: “If the trial balance agrees, every transaction was recorded.” Give a reason.
Show answer
False. A transaction omitted from both the debit and the credit side leaves the totals equal. The trial balance cannot reveal an error of omission.
2. A trial balance agrees. A printer costing RM 1,100 was debited to the stationery expense account. State the effect on profit and on assets.
Show answer
This is an error of principle. Expenses are overstated by RM 1,100, so profit is understated by RM 1,100 before depreciation. Assets are understated by RM 1,100.
3. A trial balance agrees at RM 36,000. Write one sentence that states what this shows and its limit.
Show answer
Sample answer: “The trial balance agrees at RM 36,000, so total debits equal total credits, but errors such as omission, commission, principle, original entry, compensating errors and reversals would not be revealed, so the accounts may still contain errors.”
Where this leads next
The next module, suspense and correcting errors, shows how corrections are posted when a difference remains. For practice, use the trial balance practice set. The trial-balance and error detective lets you test your wording against a ledger with a hidden error, and the percentage-base explorer lets you compare an error with the total it sits inside.
Some students find the errors and then lose marks on how the conclusion is worded. Our teachers can work on that precision in online one-to-one Accounting tuition.