A trial balance is a listing of the general ledger accounts with their balances set in a debit or a credit column at one point in time, each column totalled, run to test that total debits equal total credits. It is a working report inside the records, and the statements a firm issues are summarized from it once it has been proved.
The Internal Revenue Manual defines it in those terms, as a listing of accounts in the general ledger with their debit or credit balances in respective columns (Internal Revenue Manual 3.17.64.1.6, Terms/Definitions). The two columns and their totals are what make it a test rather than a summary.
What the Two Columns Test
The equality being tested belongs to double-entry recording, not to the report. Every transaction posts a debit in one account and an equal credit in another, which is worked through in bookkeeping, and which side an account carries its balance on is set by its normal balance, in debit vs credit. The trial balance collects the result of that across every account at once, frozen at a chosen moment.
A small firm’s ledger at the end of a quarter, before any period-end adjustments, prints like this:
Account Debit Credit
Cash 18,400
Accounts receivable 34,000
Prepaid insurance 3,600
Equipment 12,000
Accumulated depreciation 4,000
Accounts payable 5,200
Unearned fees 6,000
Owner's capital 40,000
Fees earned 48,800
Salaries expense 27,000
Rent expense 9,000
Totals 104,000 104,000Every account appears once, on the side its balance sits on, and the two totals agree. That agreement is the whole output of the report.
The Three Trial Balances a Firm Handles
The same listing gets run at three points in the period, and what separates them is which entries have been posted before it.
The unadjusted trial balance comes first, once the period’s routine postings are in and before the adjusting entries. Adjusting entries are the period-end entries that put revenue and expense in the period they belong to, accruals in one direction and deferrals in the other. Running the listing before them is a cheap way to catch a broken posting while there is still one layer of work to search.
The adjusted trial balance comes after those entries are posted, and it is the version the statements are built from. Federal reporting is exact about the condition: an entity’s submitted account balances must reflect the pre-closing adjusting entries needed to produce financial statements, and the total sum of debit balances must equal the total sum of credit balances in it (Treasury Financial Manual, Volume I, Part 2, Chapter 4700, section 4755.40).
The post-closing trial balance comes after the closing entries, and by then every account that reports a period rather than a position has been reduced to zero. You close income and expense accounts at the end of each tax year, and you keep asset, liability and net worth accounts open on a permanent basis (IRS Publication 583, Starting a Business and Keeping Records, Rev. December 2024). The first group is often called nominal or temporary, the second real or permanent.
Reading that listing is itself a check. In the federal fiscal year-end run, the monthly trial balance must be verified to assure that all nominal accounts are zero and that the real accounts have been rolled over correctly (Internal Revenue Manual 3.17.63.6.5, Fiscal Year-End Processing). A revenue account still carrying a balance after the close means the closing entries did not finish.
What a Tie Does Not Prove
The test compares two totals, so any error that leaves both totals equal passes it.
A transaction never recorded at all is invisible to it, because neither column ever saw the amount. The same entry posted twice is invisible for the opposite reason, because both columns moved by the same figure. An amount posted to the wrong account on the correct side is invisible too: charge a repair to supplies and the debit column total does not change by a cent.
A debit and a credit that landed on the wrong sides of the right two accounts also ties, and that case is worked through in debit vs credit. Two unrelated mistakes that happen to offset each other behave the same way.
So a tie is an arithmetic check on the postings and not a verdict on whether the postings were right. What catches the rest is evidence from outside the ledger, which is what a bank reconciliation supplies, and the ability to follow one balance back to the document behind it, which is the audit trail.
Where the Report Sits in the Close
It sits between the ledger and the statements, and nothing downstream starts until the listing ties. What happens on the far side of it is set out in income statement, and the sequence and ownership of the period’s work around it is in the month-end close checklist.
In a firm carrying many client books, the report doubles as a handover artifact: a reviewer can see a month’s worth of a preparer’s balances on one page, so an unexplained balance on it lands in review rather than in preparation.
What It Is Not
A balance sheet reports a position at a date and is issued to readers outside the accounting department, and how that differs from a statement covering a period is set out in income statement. The trial balance is the internal listing that every ledger account carrying a balance appears on, revenue and expense accounts included, with no grouping beyond the two columns and no subtotals.
The general ledger holds the accounts themselves and every posting inside them. The trial balance shows one line per account and only the net balance at the chosen moment, which is why it fits on a page and the ledger does not.
The chart of accounts is the list of accounts the ledger is allowed to use. The trial balance is those same accounts at one moment with a balance beside each. One is the vocabulary, the other is a reading.
Common Questions
Every general ledger account carrying a balance, named or numbered, with that balance in the debit or the credit column, and a total under each column. It carries balances, not the classification, subtotals and presentation a financial statement adds on top of them.
To prove the ledger is internally in balance before anything gets built on it, and to hand the rest of the close one settled list of balances to work from. The adjusting entries, the statements and the reviewer all read the same list.
Total each ledger account, place its balance in the debit or the credit column according to the side it sits on, total both columns and compare them. A difference is an error to find and correct, and where that search starts is worked through in debit vs credit. Any ledger system produces the report on demand, so the real work is almost never listing the accounts, it is chasing the difference.
Accountably places trained offshore accountants inside US CPA and EA firms, and a firm can run a block of its own bookkeeping through a trial task and have its own reviewer read the trial balance that comes back.
