A balanced trial balance is not proof
Why a trial balance that balances does not prove the books are right, and the checks an auditor should run on a client's trial balance on day one.
By Achekam · · 5 min read · For Accountants & audit firms in South Africa, Nigeria, Kenya
"The trial balance balances" is often said with relief, as if it settled something. It settles very little. Debits equal credits because double entry makes them equal: every journal posts both sides. A bookkeeper can post rent to the wrong account, forget a whole month of supplier invoices or reverse an entry twice, and the trial balance will still balance to the cent.
For an auditor, the trial balance is the starting document, not a proof. This article explains which errors a balanced trial balance cannot reveal, which trial balance you should be auditing, and a first-day review that catches problems before the lead schedules are built on them.
Errors a trial balance cannot reveal
Investopedia defines a trial balance as a worksheet listing all general ledger account balances to confirm that total debits equal total credits. It then warns that a balanced trial balance does not mean the books are free of errors: amounts posted to the wrong accounts, transactions never recorded, and errors that offset one another all leave it in balance.
Put in audit terms, each of those maps to an assertion:
| Error | What the trial balance shows | Assertion at risk |
|---|---|---|
| Posted to the wrong account | Both accounts wrong, total unchanged | Classification |
| Never recorded | Both sides missing, still balanced | Completeness |
| Offsetting errors | Two mistakes cancel | Accuracy |
| Wrong amount on both sides | Balanced at the wrong figure | Accuracy |
| Recorded in the wrong period | Balanced in the wrong year | Cut-off |
Not one is caught by checking debits against credits. They are caught by the audit work that follows: analytics, cut-off tests, searches for unrecorded liabilities and agreeing balances to outside evidence.
Balances with the wrong sign
There is one useful check the trial balance does support on its own. Investopedia explains that, at period end, asset, expense and loss accounts should normally have debit balances, and liability, equity, revenue and gain accounts should normally have credit balances.
A balance on the "wrong" side is not always an error. A bank account can be overdrawn; a supplier can be owed money back. But each one needs an explanation. Look for:
- Credit balances in receivables or inventory, which often mean receipts or credit notes posted to the wrong customer or account;
- Debit balances in payables, which may be overpayments, duplicate payments or invoices posted to the wrong supplier;
- Debit balances on revenue accounts, often credit notes or reversals in excess of sales;
- Credit balances on expense accounts, frequently misposted receipts or over-reversed accruals.
Each is a quick lead, available on the first day of fieldwork.
Which trial balance are you auditing?
Investopedia describes three types: the unadjusted trial balance, prepared before adjusting entries; the adjusted trial balance, used to prepare the financial statements; and the post-closing trial balance, prepared after closing entries.
Clients send whichever one is to hand. Before building lead schedules, confirm:
- Is it adjusted? Have year-end accruals, depreciation, provisions and tax been posted, or are they still on a spreadsheet?
- Is it pre- or post-closing? A post-closing trial balance has no income statement balances, because they have been closed to retained earnings.
- Which date and version? If the client posts more adjustments later, the team needs the final version, and a way of knowing it is final.
Agreeing that up front saves the frustration of auditing one version while the client finalises another.
Agreeing the trial balance to the ledger: Achekam's own totals check
A trial balance is only as good as its link to the ledger behind it. Achekam lets a firm upload a client's general ledger in the layout its accounting package exports, including Pastel and Evolution exports in CSV, .xlsx or .xls. Achekam adds the ledger up into a trial balance itself and checks every printed account total in the file against its own sum. Differences are named on screen and never quietly fixed.
That check answers a question a balanced trial balance cannot: does each account balance agree with the transactions in the ledger? A difference often means the export was cut short, a period was left out, or the trial balance came from a different run.
A trial balance can also be uploaded on its own as an Excel workbook, a CSV file or a PDF with a text layer. A stray quote mark in a CSV is read as an ordinary character and noted, so later rows are not lost.
Lead schedules traceable to lines
Once the trial balance is settled, Achekam builds the engagement's lead schedules from it, and each figure in a lead schedule can be traced to the trial balance lines behind it. Staff record any audit adjustment on a line with a reason, and raise findings from a working paper that are later closed or withdrawn. Our article on working paper workbooks and lead schedules explains how the schedules and workbooks fit together.
Traceability is what makes the earlier checks useful: a wrong-sign balance or a ledger difference found on day one can be followed to the lead schedule it would otherwise have distorted.
A first-day trial balance review
- Confirm which trial balance it is: adjusted or unadjusted, pre- or post-closing, date and version.
- Agree it to the general ledger, account by account.
- Agree opening balances to last year's audited closing balances.
- Agree retained earnings movement to last year's profit and dividends.
- List every balance on the unexpected side and ask about each.
- Compare each account with last year and with expectations; note large or unexpected movements.
- Look for suspense, clearing and "sundry" accounts with balances.
- Check that totals agree to the draft financial statements, if any.
Then move on to the statement of financial position review; see reviewing the statement of financial position.
Investopedia's explanation of the trial balance covers its purpose, the three types and the errors it cannot catch, and is a straightforward brief for new staff.
On your next engagement, put the first-day review on the planning checklist and run it before anyone builds a lead schedule. It takes little time, and it changes how the rest of fieldwork is spent.
General guidance only, not advice on your own circumstances. Tax and payroll rules change: check the current position with the authority or your adviser.
