Every set of books has a moment of reckoning — the point where you check whether everything you’ve recorded actually adds up. That moment is the trial balance. It’s one of the most important steps in the accounting cycle, yet it’s often misunderstood or skipped entirely by small business owners who rely on software to do the maths for them. Understanding what a trial balance is, how it works, and what it can and can’t tell you is a fundamental part of knowing whether your financial records are in good shape.
What Is a Trial Balance?
A trial balance is a summary of all the balances in your general ledger at a specific point in time, arranged into two columns: debits on the left and credits on the right. If your double-entry bookkeeping has been done correctly, the two columns must always add up to the same total. That equality is the whole point.
The name comes from an older accounting tradition — you were literally “trialling” (testing) whether your books balanced before preparing the final financial statements. Today it sits at the heart of the accounting cycle, acting as a checkpoint between your daily transaction recording and the production of your income statement and balance sheet.
A trial balance doesn’t tell you whether your accounts are correct — it tells you whether they balance. That’s a crucial distinction, and one every business owner should understand.
A trial balance lists every account in your chart of accounts — assets, liabilities, equity, income, and expenses — alongside its closing debit or credit balance. Every pound, dollar, or unit of currency entered as a debit somewhere must appear as a credit somewhere else. If the two columns don’t match, there is a bookkeeping error that must be found and corrected before financial statements can be produced.
How to Prepare a Trial Balance
Preparing a trial balance is a straightforward process once you have your ledger accounts up to date. Most accounting software will generate one automatically, but understanding the manual steps helps you interpret what you’re looking at.
Step 1 — Close off each ledger account. For every account in your general ledger, calculate the net balance. If debits exceed credits in an account, it has a debit balance. If credits exceed debits, it has a credit balance.
Step 2 — List every account. Set up a three-column schedule: account name, debit balance, and credit balance. Every account gets one row. An account only ever appears in one column — never both.
Step 3 — Know which column each account type belongs in. Assets and expenses normally carry debit balances. Liabilities, equity, and income normally carry credit balances. Contra accounts (such as accumulated depreciation or an allowance for doubtful debts) sit in the opposite column to their parent account.
Step 4 — Total both columns. Add up the debit column and the credit column separately. If the totals agree, your books balance for that period. If they don’t, you have at least one error to find.
Step 5 — Investigate any difference. A difference that is divisible by 9 often indicates a transposition error (e.g. entering £364 as £346). A difference that is exactly double a known figure often means a single entry was posted twice — or not at all — on one side.
Worked Example — Oakfield Trading Ltd
Oakfield Trading Ltd is a small wholesale business at the end of its first month of trading. The bookkeeper has posted all transactions and now prepares the trial balance to check whether the ledger is in order before producing the month-end income statement and balance sheet.
| Account | Debit (£) | Credit (£) |
|---|---|---|
| Cash at bank | 14,200 | |
| Trade receivables | 8,500 | |
| Inventory | 6,300 | |
| Office equipment | 4,000 | |
| Accumulated depreciation — equipment | 400 | |
| Trade payables | 5,200 | |
| Bank loan | 10,000 | |
| Share capital | 12,000 | |
| Retained earnings | 0 | |
| Sales revenue | 22,400 | |
| Cost of goods sold | 11,800 | |
| Rent expense | 2,100 | |
| Wages expense | 2,700 | |
| Depreciation expense | 400 | |
| TOTAL | £50,000 | £50,000 |
Both columns total £50,000. The ledger balances. Oakfield’s bookkeeper can now proceed with confidence to prepare the income statement (using the revenue and expense accounts) and the balance sheet (using the asset, liability, and equity accounts).
Notice that accumulated depreciation appears in the credit column even though it relates to an asset. It is a contra-asset account — it offsets the gross value of the office equipment rather than being listed separately as a debit. This is normal treatment and one of the areas that most often confuses people new to trial balances.
The Three Types of Trial Balance
The term “trial balance” doesn’t always refer to the same document. There are three distinct versions, each used at a different stage of the period-end process.
Unadjusted trial balance. This is the trial balance produced directly from the ledger before any period-end adjustments are made. It captures the raw balances as posted throughout the period — but it won’t yet reflect accruals, prepayments, depreciation charges, or provisions. This is your starting point.
Adjusted trial balance. Once all period-end adjustments have been journalled and posted — accrued expenses, prepaid costs, depreciation, and so on — you produce an adjusted trial balance. This version gives a more accurate picture of the business’s financial position and is the document used to prepare the final financial statements. If you’re unfamiliar with accruals and prepayments, our guide on accruals and prepayments explained covers the adjusting entries in detail.
Post-closing trial balance. After the financial statements have been produced and the temporary accounts (income and expenses) have been closed off to retained earnings, a final trial balance is prepared. This confirms that only permanent accounts — assets, liabilities, and equity — remain open going into the next period. It acts as the opening position for the new reporting cycle.
What a Trial Balance Won’t Catch
A balanced trial balance is a good sign, but it is not a guarantee of accuracy. There are several categories of error that leave both columns perfectly equal despite the underlying records being wrong.
Errors of omission. If a transaction is simply not recorded at all — neither the debit nor the credit — both columns remain equal. The trial balance won’t flag it.
Errors of commission. If a transaction is posted to the wrong account but the correct side — for example, rent expense debited to wages expense — the columns still balance. You’ve posted to the right type of account (both are expenses) but to the wrong one specifically.
Compensating errors. If two separate mistakes cancel each other out — one overstatement and one understatement of equal amounts — the trial balance will appear balanced despite two underlying errors.
Errors of principle. Posting a capital expenditure to the income statement as a revenue expense is a classic example. The debit and credit are technically correct, but the accounting treatment violates the principle of how capital items should be handled. The trial balance has no way of detecting this.
For multi-entity businesses, the challenge is compounded — a balanced trial balance in each subsidiary doesn’t mean the consolidated group position is clean. BrizoConsol’s guide on how to prepare for audit with consolidated financials covers the additional layer of checks required when combining trial balances across multiple entities.
Trial Balance vs Balance Sheet
A common point of confusion is the difference between a trial balance and a balance sheet. They contain overlapping information, but they serve very different purposes.
The trial balance includes every account — assets, liabilities, equity, income, and expenses — in one comprehensive list. It is an internal working document, not a formal financial statement. It is used by accountants and bookkeepers to verify the ledger before producing anything external.
The balance sheet, by contrast, includes only the permanent accounts — assets, liabilities, and equity — and presents them in a structured format designed to be read by stakeholders. Income and expense accounts don’t appear on the balance sheet; their net result flows through to retained earnings. The balance sheet is a formal financial statement. The trial balance is the step that comes before it.
Key Takeaways
- A trial balance lists every general ledger account balance in debit and credit columns. If total debits equal total credits, your books balance for the period.
- It is produced at three stages: unadjusted (before period-end entries), adjusted (after accruals and prepayments), and post-closing (after income and expense accounts are closed).
- A balanced trial balance does not mean your records are error-free — it only means there are no unmatched debit/credit postings. Errors of omission, commission, and principle can all hide within a balanced trial balance.
- The trial balance is an internal working document. It feeds into the income statement and balance sheet but is not itself a formal financial statement.
- In most accounting software, a trial balance is generated automatically — but understanding it manually helps you interpret results, spot anomalies, and troubleshoot discrepancies when they arise.
Related reading: If you found this guide useful, you may also want to read our posts on double-entry bookkeeping explained, understanding the balance sheet, accruals and prepayments explained, and understanding the income statement.