A trial balance is a list of every account in your books with its balance on a given date, split into two columns: debits and credits. If the books were recorded under double-entry rules, the two columns add up to the same total. That is the whole report.
It sounds dry, and it is, but it is the report your accountant often asks for first, because it shows every balance in your books on one page. Knowing how to read it, and knowing its limits, will help you spot problems in your own books before anyone else does.
How to read a trial balance
Accounts are usually listed in the order of your chart of accounts: assets, then liabilities, then equity, then income, then expenses. Asset and expense accounts normally carry debit balances. Liability, equity, and income accounts normally carry credit balances. A simple trial balance might show cash of $18,000 and equipment of $25,000 as debits, a loan of $20,000 and sales of $90,000 as credits, and rent, payroll, and supplies as debits. If total debits and total credits match, the report balances.
In most bookkeeping software, the trial balance is a standard report. Because the software enforces double entry, it will almost always balance on its own. That is why its real value for a business owner is not the totals at the bottom, but the individual balances in between.
Unadjusted, adjusted, and post-closing
Accountants refer to three versions. The unadjusted trial balance is pulled after the month's transactions are recorded but before adjustments. The adjusted trial balance comes after month-end or year-end entries such as depreciation, accrued expenses, prepaid expenses being used up, and corrections. Financial statements are built from the adjusted version.
The post-closing trial balance is pulled after the year is closed, when income and expense accounts have been zeroed out into retained earnings. Only balance sheet accounts remain, and those balances become the opening balances for the new year. If your accountant made year-end adjustments and they were never entered into your books, your opening balances will not match theirs, and that gap tends to cause confusion for years.
What a balanced trial balance does not prove
A trial balance that balances only proves that every entry had equal debits and credits. It does not prove the entries are right. It misses a transaction that was never recorded at all, a transaction recorded twice, a payment posted to the wrong account, such as an owner draw booked as an expense, and two errors that happen to cancel each other out. Those are the most common bookkeeping errors, and none of them affect the totals.
That is why reconciliations matter more. A bank reconciliation proves your cash balance matches reality. Reconciling credit cards, loans, and payroll liabilities to their statements does the same for those accounts. The trial balance is where you check that all of that work actually got done.
Red flags to scan for each month
Read down the list and ask whether each balance makes sense. Watch for a negative cash balance when the bank account is not overdrawn; a credit balance in an expense account, or a debit balance in an income account; anything sitting in uncategorized, suspense, or ask-my-accountant accounts; a balance in Opening Balance Equity, which usually means setup entries were never finished; undeposited funds that keep growing; a loan balance that never goes down even though you make payments, which means the payments are being recorded as expenses; and sales tax or payroll liability accounts that keep climbing.
Each of those is a symptom of something specific, and fixing them before year end is far cheaper than fixing them during tax season.
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