A trial balance is a list of the balances in the general ledger at a particular date, arranged in debit and credit columns. Its main purpose is to check whether the total debit balances equal the total credit balances before financial statements are prepared.
A balanced trial balance is useful, but it is not proof that every transaction has been recorded correctly. Some accounting errors affect the equality of debits and credits, while others leave the trial balance perfectly balanced.
What Is a Trial Balance?
Under double-entry bookkeeping, every transaction has equal debit and credit effects. After transactions have been posted to ledger accounts and each account has been balanced, the closing balances are extracted into a trial balance.
The basic check is:
Total debit balances = Total credit balances
A trial balance is an internal accounting report. It is not the same as a statement of financial position, and it is not normally issued to external users as a complete financial statement.
Why Is a Trial Balance Prepared?
- To check the arithmetic equality of ledger debits and credits.
- To provide a structured starting point for year-end adjustments.
- To help identify posting, casting and balance-extraction errors.
- To support the preparation of the statement of profit or loss and statement of financial position.
- To provide an audit trail between ledger accounts and financial statements.
How to Prepare a Trial Balance
- Post all transactions to the appropriate ledger accounts.
- Total the debit and credit sides of each account.
- Calculate the balance carried down for each account.
- List each ledger balance in the debit or credit column.
- Add the two columns and compare the totals.
- Investigate any difference before preparing the final accounts.
Typical Debit and Credit Balances
| Normally debit balances | Normally credit balances |
|---|---|
| Assets such as cash, inventory, receivables and equipment | Liabilities such as payables and loans |
| Expenses such as wages, rent and electricity | Income such as sales and commission received |
| Drawings and distributions to owners | Capital, share capital and retained earnings |
These are normal patterns rather than absolute rules. For example, a bank account can show a credit balance when it is overdrawn, and a customer account can temporarily show a credit balance after an overpayment.
Worked Trial Balance Example
Assume the following ledger balances at 31 December:
| Account | Debit ($) | Credit ($) |
|---|---|---|
| Cash | 8,000 | |
| Trade receivables | 12,000 | |
| Equipment | 25,000 | |
| Purchases | 38,000 | |
| Operating expenses | 17,000 | |
| Trade payables | 15,000 | |
| Sales | 55,000 | |
| Capital | 30,000 | |
| Total | 100,000 | 100,000 |
The equal totals show that the ledger is arithmetically balanced. Adjustments may still be required for accruals, prepayments, depreciation, inventory, irrecoverable debts and other year-end matters.
Errors That Usually Cause a Trial Balance Difference
- One-sided posting: only the debit or the credit entry was posted.
- Unequal posting: different amounts were entered on the two sides.
- Wrong-side posting: one part of a transaction was entered on the wrong side of an account.
- Incorrect addition: an account or trial-balance column was totalled incorrectly.
- Balance omitted: a ledger balance was not transferred to the trial balance.
- Balance copied incorrectly: a correct ledger balance was entered with the wrong amount.
Errors a Balanced Trial Balance Does Not Detect
| Error | Why the trial balance still agrees |
|---|---|
| Complete omission | Neither the debit nor credit was recorded. |
| Error of commission | The correct amount was posted to the wrong account of the same class. |
| Error of principle | Both entries were recorded, but the accounting treatment was conceptually wrong. |
| Error of original entry | The same incorrect amount was entered on both sides. |
| Reversal of entries | The debit and credit accounts were reversed. |
| Compensating errors | Two unrelated errors cancel each other numerically. |
Trial Balance Difference and the Suspense Account
If the trial balance does not agree and the difference cannot be located immediately, a temporary suspense account may be used so that draft financial statements can be prepared. Corrections are then posted as errors are discovered. The suspense account should be cleared when all balancing errors have been corrected.
A suspense account is not a substitute for investigation. It is a temporary control device, and any remaining balance requires explanation.
Unadjusted, Adjusted and Post-Closing Trial Balances
- Unadjusted trial balance: prepared before year-end adjustments.
- Adjusted trial balance: prepared after accruals, prepayments, depreciation and other adjustments.
- Post-closing trial balance: prepared after temporary income and expense accounts have been closed.
Trial Balance in a Computerised Accounting System
Modern accounting systems normally prevent an unbalanced journal from being posted, so the general ledger may remain arithmetically balanced at all times. However, software cannot automatically prevent every error. Transactions can still be coded to the wrong account, duplicated, omitted, entered in the wrong period or supported by incorrect source documents.
Useful controls include journal approval, account reconciliations, exception reports, access restrictions, audit logs and regular review of unusual balances.
Trial Balance vs Balance Sheet
| Trial balance | Statement of financial position |
|---|---|
| Internal list of ledger balances | Formal financial statement |
| Includes assets, liabilities, equity, income and expenses | Reports assets, liabilities and equity at a date |
| Used to check and prepare accounts | Used to communicate financial position |
Frequently Asked Questions
Does a balanced trial balance prove that the accounts are correct?
No. It confirms debit-credit equality, but it does not detect every omission, classification error, reversal or incorrect estimate.
Why do debit and credit totals have to be equal?
Because double-entry bookkeeping records equal debit and credit effects for each transaction.
Is a trial balance a financial statement?
No. It is an internal accounting schedule used to support checks, adjustments and financial-statement preparation.
What should be done when the trial balance does not agree?
Recheck additions, ledger balances, one-sided entries, transposition errors and omitted balances. A temporary suspense account may be used while errors are investigated.
Related Accounting Guides
Conclusion
A trial balance is an essential checkpoint between ledger bookkeeping and financial reporting. It helps confirm arithmetic equality and provides a structured basis for adjustments, but it cannot prove that every transaction is complete, correctly classified or measured. Effective accounting therefore combines the trial balance with reconciliations, supporting documents, review controls and professional judgement.
Authoritative references: ACCA — Financial Accounting, ACCA — Suspense Accounts and Error Correction, and ACCA — Computerised Accounting Systems.