How to Prepare a Trial Balance (Step-by-Step)

After recording transactions in the journal and posting them to the general ledger, accountants prepare a trial balance — a list of all account balances that proves debits still equal credits. It's the checkpoint between day-to-day bookkeeping and formal financial statements.

What Is a Trial Balance?

A trial balance is a worksheet that lists every general ledger account alongside its ending debit or credit balance. The purpose is simple: add up all debit balances and all credit balances. If they're equal, your books are mathematically in balance. If they're not, you have an error to find.

There are three versions you'll encounter:

• Unadjusted trial balance — pulled before adjusting entries (accruals, deferrals, depreciation)
• Adjusted trial balance — after adjusting entries, the basis for financial statements
• Post-closing trial balance — after closing entries, confirms only permanent accounts remain open

Step-by-Step: How to Prepare a Trial Balance

Step 1: Gather All Ledger Account Balances

Open every T-account (or ledger account) in the general ledger. For each account, calculate the ending balance by totaling the debit side, totaling the credit side, and finding the net difference. The balance sits on the side with the larger total.

Step 2: List Each Account

Create a three-column worksheet:

• Column 1: Account name
• Column 2: Debit balance
• Column 3: Credit balance

List accounts in the standard order: assets, liabilities, equity, revenue, expenses. Place each balance in the debit or credit column depending on its normal balance. For example, Cash (asset, normal debit) goes in the debit column. Accounts Payable (liability, normal credit) goes in the credit column.

Step 3: Total Both Columns

Add up all debit balances. Add up all credit balances. Both totals must match exactly.

A Simple Example

Account                   Debit       Credit
Cash                    $12,000
Accounts Receivable      $4,500
Equipment               $18,000
Accounts Payable                       $3,200
Notes Payable                          $8,000
Common Stock                          $20,000
Retained Earnings                      $1,500
Service Revenue                        $6,800
Rent Expense             $2,400
Salaries Expense         $2,600
                        ──────────   ──────────
TOTALS                  $39,500      $39,500

Debits equal credits: the trial balance is in balance.

Errors the Trial Balance Catches

Any error that causes total debits to differ from total credits will be caught:

• A transaction recorded with the wrong dollar amount on one side
• A transaction entered as a debit in the journal but never posted to the ledger
• An arithmetic error in a T-account balance calculation
• A transposition error where, say, $648 is posted as $684 on one side only

Errors the Trial Balance Does NOT Catch

This is the critical limitation students often miss:

• Complete omission — if you simply forgot to record a transaction entirely, both sides are missing and the trial balance stays balanced
• Wrong account used — debiting Equipment when you should have debited Vehicles still balances
• Reversed entry — if you debited Cash and credited Revenue when you should have debited Accounts Receivable and credited Revenue, it balances
• Compensating errors — two equal errors that cancel out

This is why accountants also prepare bank reconciliations, perform account analysis, and conduct internal audits — the trial balance is a necessary but not sufficient control.

Adjusted Trial Balance

Before financial statements are prepared, adjusting entries are made for:

• Accrued revenue — earned but not yet billed
• Accrued expenses — incurred but not yet paid
• Deferred revenue — cash received but service not yet performed
• Prepaid expenses — cash paid but benefit not yet consumed
• Depreciation — allocation of asset cost over its useful life

After posting these adjusting entries, you prepare the adjusted trial balance. This is the version you use to draft the income statement, statement of retained earnings, and balance sheet.

Moving from Trial Balance to Financial Statements

The adjusted trial balance is essentially a blueprint for the financial statements:

• Revenue and expense accounts → Income Statement
• Asset, liability, and equity accounts → Balance Sheet
• Beginning and ending retained earnings → Statement of Retained Earnings

After the financial statements are complete, closing entries zero out revenue, expense, and dividend accounts. A final post-closing trial balance confirms only permanent accounts (assets, liabilities, equity) remain with balances.

Practice Makes Permanent

The trial balance sits at the center of the accounting cycle. Understanding it deeply — including knowing which errors it catches and misses — is essential for anyone preparing for accounting exams or working in bookkeeping and finance.