A trial balance lists every account in the general ledger with its balance, then checks that total debits equal total credits. It’s the checkpoint in the accounting process between recording transactions and preparing financial statements. Most problems with trial balance preparation come down to one of two things: listing a balance in the wrong column, or tracking down a small error when the totals don’t match.
What a trial balance is checking
Double-entry bookkeeping means every journal entry has equal debits and credits. So if everything was recorded and posted correctly, the debit balances in the ledger must add up to the same total as the credit balances. That’s all the trial balance tests.
Step-by-step trial balance preparation
- Post all journal entries to the general ledger (or T-accounts).
- Find each account’s balance by totaling its debits and credits and taking the difference. The balance sits on the side with the larger total.
- List the accounts in standard order: assets, liabilities, equity, revenues, then expenses.
- Put each balance in the right column. A debit balance goes in the debit column and a credit balance in the credit column.
- Total both columns and compare them.
Worked example
Debit balances: Cash 5,000; Accounts receivable 2,000; Equipment 8,000; Rent expense 1,500; Salaries expense 1,000.
Credit balances: Accounts payable 3,000; Common stock 10,000; Service revenue 4,500.
Total debits = 5,000 + 2,000 + 8,000 + 1,500 + 1,000 = 17,500
Total credits = 3,000 + 10,000 + 4,500 = 17,500
The columns match, so the trial balance balances.
When your trial balance doesn’t balance
Work through these checks in order, because the size of the difference usually points to the cause:
- Re-add both columns. Simple addition errors are the most common cause.
- Check whether the difference is divisible by 9. That points to a transposition (writing 1,500 as 1,050) or a slide (writing 1,500 as 150). If rent expense were listed as 1,050 instead of 1,500, debits would total 17,050 against credits of 17,500. The difference is 450, and 450 ÷ 9 = 50.
- Check whether the difference is exactly twice an account balance. That usually means a balance was put in the wrong column.
- Check whether the difference equals a single balance or entry. You may have left an account off the list, or posted only one side of an entry.
- Retrace the postings from the journal one entry at a time if nothing else explains it.
What a balanced trial balance doesn’t prove
Balanced columns don’t mean the books are correct. A transaction that was never recorded, an entry posted to the wrong account with the right amount, or two errors that cancel each other out will all leave the trial balance balanced. It catches one kind of mistake, not all of them.
Common mistakes
Putting a balance in the wrong column. Contra accounts like accumulated depreciation have credit balances even though they sit among the assets. Always go by the account’s actual balance, not its category.
Assuming a balanced trial balance means the books are right. It only proves debits equal credits. Review the entries themselves, too.
A trial balance that won’t balance is one of the most common requests in financial accounting homework help sessions. Walking through it with someone is usually faster than hunting for the error alone.
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