An overview of what a trial balance is, its purpose in accounting, and how it serves as a fundamental tool for verifying the accuracy of financial records.
Introduction to Trial Balance
Fundamental tool in accounting for verifying the accuracy of ledger postings.
| Definition | Purpose |
|---|---|
| A trial balance is a worksheet that lists all debit and credit balances of a company’s general ledger accounts at a specific point in time. | • Checks that total debits equal total credits (the trial balance equation). • Provides the basis for preparing financial statements. • Helps detect posting errors early. |
| Concept | Explanation |
|---|---|
| Double‑entry bookkeeping | Every transaction affects at least two accounts: one debit and one credit of equal amount. |
| Debit (Dr.) | Increases assets & expenses; decreases liabilities, equity & revenue. |
| Credit (Cr.) | Increases liabilities, equity & revenue; decreases assets & expenses. |
| Balance‑sheet accounts | Assets, Liabilities, Equity – carried forward to the next accounting period. |
| Income‑statement accounts | Revenues & Expenses – closed to retained earnings at period‑end. |
| Timing | Reason |
|---|---|
| Period‑end (monthly, quarterly, annually) | To verify that the ledger is arithmetically correct before preparing financial statements. |
| Interim periods (e.g., after a major posting batch) | To catch errors early and maintain confidence in the books. |
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| Account Title | Account No. | Debit | Credit |
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| Cash | 101 | 45,000| |
| Accounts Receivable | 102 | 12,500| |
| Supplies | 103 | 3,200| |
| Equipment | 150 | 27,000| |
| Accumulated Depreciation – Equip.| 151| | 5,000 |
| Accounts Payable | 200 | | 8,700 |
| Notes Payable | 210 | |15,000 |
| Common Stock | 300 | |30,000 |
| Service Revenue | 400 | |22,500 |
| Salaries Expense| 500 | 9,300 | |
| Rent Expense | 510 | 2,400 | |
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| **Totals** | | 99,400| 99,400 |
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Columns:
The total of the Debit column must equal the total of the Credit column.
| Error Type | Why It Remains Hidden |
|---|---|
| Equal debit & credit errors (e.g., posting $500 to the wrong debit account) | Totals still balance. |
| Omission of a transaction (both debit and credit omitted) | No effect on totals. |
| Commission errors (correct amount posted to wrong account) | Totals unchanged. |
| Compensating errors (one error overstates, another understates by the same amount) | Net effect cancels out. |
| Transposition errors that still sum |