Trial Balance: What It Is, How to Prepare It and What It Proves

A trial balance is a list of every account in the general ledger with its closing debit or credit balance at a given date, and its total debits must equal its total credits. It sits between the books and the financial statements: you extract it after posting, correct it with adjusting entries, then map it into the statement of financial position and the statement of profit or loss. A balanced trial balance shows that the ledger is arithmetically consistent. It does not show that the books are right, and treating it as proof is one of the most common mistakes in small finance teams.

What a trial balance is and why it matters

In double-entry bookkeeping, every transaction is recorded with equal debits and credits. If every entry balances, the sum of all debit balances in the ledger must equal the sum of all credit balances. The trial balance tests that, and it gives you something more useful: one page that shows every account, so you can see at a glance whether any balance looks wrong.

The finance manager uses it to review the month, the owner to see the position before the statements are ready, the external auditor as the starting point of the audit, and whoever prepares the Zakat or tax return, because those returns rely on figures from the financial statements built on it.

What a trial balance looks like

Accounting systems usually print a trial balance with these columns:

• Account code and account name, in the order of the chart of accounts.
• Opening balance, debit or credit.
• Debit and credit movements for the period.
• Closing balance, debit or credit.

Textbooks distinguish a trial balance of totals, which lists the total debits and total credits posted to each account, from a trial balance of balances, which lists only the net balance of each account. Both must agree in total. In practice you will meet the trial balance at three stages:

• Unadjusted trial balance: extracted after routine postings, before period-end adjustments.
• Adjusted trial balance: after accruals, prepayments, depreciation, provisions and corrections. The financial statements are prepared from this one.
• Post-closing trial balance: after revenue and expense accounts are closed to retained earnings at year-end. Only asset, liability and equity accounts remain.

Each account has a normal side. Assets and expenses normally carry debit balances; liabilities, equity and revenue normally carry credit balances. Contra accounts, such as accumulated depreciation or the allowance for expected credit losses, carry the opposite balance of the account they reduce.

How to prepare a trial balance

1. Post every entry for the period: sales and purchase invoices, receipts and payments, payroll and any manual journals. Chase supplier invoices that arrive after the period end but belong to it.
2. Reconcile the bank accounts to the bank statements and clear unexplained items.
3. Reconcile the subsidiary ledgers to their control accounts: customer balances to receivables, supplier balances to payables, the inventory listing to inventory, and the fixed asset register to the asset accounts.
4. Extract the trial balance at the period-end date from the system, or list every ledger account with its balance if you work manually.
5. Check the totals and confirm that any suspense or clearing account is nil.
6. Review every balance: is it on its normal side, is the movement against the previous period reasonable, and has every account that should move each month (depreciation, accruals, payroll) actually moved?
7. Post the adjusting entries and extract the adjusted trial balance.

What a balanced trial balance proves, and what it does not

A balanced trial balance proves that the debits and credits posted to the ledger are equal and, in a manual system, that the ledger was added up correctly. Accounting software refuses unbalanced entries, so its trial balance almost always agrees. In that setting, the value of the trial balance lies in reviewing the balances, not in the totals.

It does not reveal errors that affect both sides equally:

• Errors of omission: a transaction never recorded, such as a supplier invoice left in a drawer.
• Errors of commission: the right amount posted to the wrong account of the same type, such as one customer’s receipt credited to another customer.
• Errors of principle: a transaction recorded in the wrong kind of account, such as a vehicle purchase charged to expenses instead of fixed assets.
• Errors of original entry: a wrong amount recorded on both sides.
• Reversal errors: the debit and credit accounts swapped.
• Duplication: the same invoice posted twice.
• Compensating errors: two mistakes that cancel each other out.

Nor does it test cut-off, valuation or tax treatment. Those come from reconciliations, analytical review and supporting documents.

Finding the difference when it does not balance

When the totals disagree, work in this order:

• Re-add the columns and confirm every account was listed, including accounts with small or unusual balances.
• Check that the opening balances brought forward equal the closing balances of the previous period.
• If the difference equals the amount of a single entry, look for an entry posted on one side only.
• If the difference is twice an amount, look for an entry posted on the wrong side: search for a balance or entry equal to half the difference.
• If the difference divides exactly by nine, suspect a transposition (two adjacent digits swapped) or a slide (a misplaced decimal point).

Avoid parking the difference in a suspense account and moving on. If you must use one to keep working, clear it before the period is closed, and never let a suspense balance reach the year-end statements.

The trial balance in the monthly and year-end close

A sound close runs on the trial balance. Each month, the adjustments usually include accrued expenses, prepayments, depreciation, payroll and GOSI contributions, the provision for employees’ end-of-service benefits under the Labor Law, and a reconciliation of the VAT accounts to the returns filed with ZATCA. At year-end, add the Zakat or income tax provision, an inventory count, the allowance for expected credit losses on receivables, and confirmation of balances with related parties.

The adjusted trial balance is then mapped to the lines of the financial statements, which are prepared under IFRS as adopted in the Kingdom: full IFRS or IFRS for SMEs as endorsed by SOCPA, depending on the entity. Keep the mapping fixed from year to year so comparative figures stay consistent, and give your external auditor the final trial balance with supporting schedules for each significant line. If your monthly trial balance needs more cleaning than reviewing, an Innovant advisor can help you set up a close checklist and a review routine your team can keep.

Common mistakes

• Extracting the trial balance too early, before late supplier invoices, bank charges and payroll entries are posted.
• Leaving balances in suspense or “unclassified” accounts at the period end.
• Ignoring abnormal balances. A credit balance on a cash account usually means unrecorded receipts or an overdraft; a debit balance on a supplier account usually means an advance or a duplicate payment.
• Not reconciling the VAT accounts to the returns, so differences surface only when ZATCA reviews them.
• Recording the owner’s personal spending as company expenses, or leaving it in a vague account that nobody reconciles.
• Changing the chart of accounts mid-year without mapping old accounts to new ones.
• Keeping the trial balance in a spreadsheet with typed totals instead of formulas tied to the ledger.
• Leaving closed periods open, so back-dated entries change a trial balance that was already reported.

Frequently asked questions

Related reading: Cash Flow Statement: The Three Sections, Methods and How to Read It

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