Balanced Trial Balance: 5 Errors It Will Not Catch

A trial balance tests one thing only: whether the total of the debit column equals the total of the credit column. That is a test of arithmetic, not of judgement.

An error that removes the same amount from both sides, or adds the same amount to both sides, leaves the two totals in perfect agreement. Five well-known error types do exactly that, which is why a set of books can balance to the last cent and still report the wrong profit.

Under double-entry bookkeeping, every transaction is recorded with a debit and a matching credit. If that rule was followed every time, the sum of all debit balances must equal the sum of all credit balances. The trial balance checks that sum.

Put simply, the trial balance checks the bookkeeping mechanics. It does not check the accounting decisions behind them.

These names come up in textbooks and exam questions. The wording differs between syllabuses, but the ideas are the same.

Trial balance

A list of every ledger account balance, split into a debit column and a credit column, used to check that the two column totals agree.

Arithmetical accuracy

The only thing a trial balance tests. It confirms the postings add up, not that the right accounts or the right amounts were used.

Error of omission

A transaction left out of the books entirely, so neither the debit nor the credit was ever recorded.

Error of commission

The correct amount posted to the wrong account of the same type, such as the wrong customer within trade receivables.

Error of principle

The correct amount posted to an account of the wrong category, such as treating the purchase of an asset as an expense.

Error of original entry

A wrong figure taken from the source document and then posted consistently to both the debit and the credit side.

Compensating error

Two unrelated errors of equal value on opposite sides that cancel each other out in the column totals.

Suspense account

A temporary holding account used to park a difference while the cause is investigated. It is only needed when the trial balance does not balance.

Each one below keeps the debit and credit totals equal. For each, the example shows what happened, why the totals still agree, and the check most likely to find it.

A business buys a laptop for RM 5,000 in cash and posts the debit to Office Expenses instead of Equipment. Below is the trial balance that results.

Both columns total RM 24,000, so the trial balance agrees and nothing looks wrong. Yet Office Expenses contains RM 5,000 that belongs in Equipment. Profit for the period is understated by RM 5,000 and total assets are understated by the same amount.

Correcting it means debiting Equipment RM 5,000 and crediting Office Expenses RM 5,000. Notice that the correcting entry has a debit and a credit of equal value, which is exactly why the original error never disturbed the totals.

The picture is not all bad. Any error that changes one column without changing the other will show up as a difference between the totals.

• A one-sided posting, where the debit was entered but the credit was not.
• Posting the same entry twice on one side only.
• Entering an amount on the wrong side of a single account.
• A transposition such as RM 540 written as RM 450 in one account only.
• An addition or casting error when totalling a column.
• Copying a ledger balance into the trial balance incorrectly.

If your totals do not agree, the cause is one of these rather than the five above. The guide on why a trial balance is not balancing works through how to trace the difference.

Agreement of the columns is where the review starts, not where it ends. These checks look for the errors the totals cannot reveal.

• Compare the closing balance of each bank and cash account with an external statement.
• Agree the total of the receivables ledger with the individual customer balances.
• Agree the total of the payables ledger with the individual supplier balances.
• Review large or unusual expense postings for items that should have been capitalised.
• Check that every invoice and receipt in the period has a matching entry in the books.
• Compare this period's balances with the previous period and investigate anything that moved unexpectedly.
• Confirm that opening balances were carried forward correctly from the last period.

Comparing each balance against the previous period is the single most useful habit. Compensating errors and errors of principle rarely look wrong on their own, but they often look odd next to last period.

• I confirmed the two column totals agree.
• I checked that no source document was left unrecorded.
• I checked that amounts were posted to the correct individual account, not just the correct category.
• I checked that asset purchases were not posted to expense accounts.
• I traced a sample of postings back to the original invoice or receipt.
• I reconciled the bank balance to an external statement.
• I compared the balances with the previous period.
• I understand that agreement of the totals is a starting point, not proof of accuracy.

This guide explains general bookkeeping concepts for learning and review. It is not audit or accounting advice for a specific set of accounts.

This guide is based on the official pages below, last checked on 19 August 2026. Where they disagree with anything written here, they are the authority.

• IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors

  How a prior period error is corrected once it is found, including restating the comparative figures. MASB adopts this in Malaysia as MFRS 108.

• IAS 1 Presentation of Financial Statements

  The statements a hidden error ultimately misstates, even while the trial balance still agrees. MFRS 101 in Malaysia.

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