Understanding Trial Balance: Definition, Purpose, and Key Requirements

What Is a Trial Balance?

A trial balance serves as a crucial tool in bookkeeping, ensuring that the totals of all debit and credit balances from the ledgers match. Companies typically prepare a trial balance at the end of each reporting period to confirm the mathematical accuracy of their bookkeeping entries. While it does not replace a full audit, a trial balance is a foundational step in the process, helping to identify any mathematical discrepancies before delving into more detailed financial analyses.

Understanding the Mechanics of a Trial Balance

Preparing a trial balance for a company serves to detect any mathematical errors that have occurred in the double entry accounting system.  If debits equal credits, the trial balance is balanced, indicating no math errors in the ledgers. However, this doesn't mean the accounting system has no errors. Improperly classified or missing transactions can be accounting errors unnoticed by the trial balance.

Essential Elements for Preparing a Trial Balance

Companies initially record their business transactions in bookkeeping accounts within the general ledger. Depending on transactions, ledger accounts may be debited or credited before being used in a trial balance. Furthermore, some accounts may have been used to record multiple business transactions. As a result, the ending balance of each ledger account as shown in the trial balance worksheet is the sum of all debits and credits that have been entered to that account based on all related business transactions.

At period end, asset, expense, or loss accounts should have debit balances; liability, equity, revenue, or gain accounts should have credit balances. However, some accounts may be credited or debited during the period, reducing their ending balances. On a trial balance worksheet, all of the debit balances form the left column, and all of the credit balances form the right column, with the account titles placed to the far left of the two columns.

Exploring Different Types of Trial Balances

The three types of trial balances are unadjusted, adjusted, and post-closing.

All three of these types have exactly the same format but slightly different uses. The unadjusted trial balance is prepared on the fly, before adjusting journal entries are completed. It is a record of day-to-day transactions and can be used to balance a ledger by adjusting entries.

Once a book is balanced, an adjusted trial balance can be completed. This trial balance has the final balances in all the accounts, and it is used to prepare the financial statements. The post-closing trial balance shows the balances after the closing entries have been completed. This is your starting trial balance for the next year.

Comparing Trial Balances and Balance Sheets

The key difference between a trial balance and a balance sheet is one of scope. A balance sheet records not only the closing balances of accounts within a company but also the assets, liabilities, and equity of the company. It is usually released to the public, rather than just being used internally, and requires the signature of an auditor to be regarded as trustworthy.

A trial balance is a less formal document. There are no special conventions about how trial balances should be prepared, and they may be completed as often as a company needs them. A trial balance is often used as a tool to keep track of a company’s finances throughout the year, whereas a balance sheet is a legal statement of the financial position of a company at the end of a financial year.

Important Considerations for Using a Trial Balance

After all the ledger accounts and their balances are listed on a trial balance worksheet in their standard format, add up all debit balances and credit balances separately to prove the equality between total debits and total credits. Such uniformity guarantees that there are no unequal debits and credits that have been incorrectly entered during the double entry recording process. However, a trial balance cannot detect bookkeeping errors that are not simple mathematical mistakes. If equal debits and credits are entered into the wrong accounts, a transaction is not recorded, or offsetting errors are made with a debit and a credit at the same time, a trial balance still would show a perfect balance between total debits and credits.

The Bottom Line

A trial balance is a worksheet with two columns, one for debits and one for credits, that ensures a company’s bookkeeping is mathematically correct. The debits and credits include all business transactions for a company over a certain period, including the sum of such accounts as assets, expenses, liabilities, and revenues. 

Debits and credits of a trial balance must tally to ensure that there are no mathematical errors. However, there still could be mistakes or errors in the accounting systems. A trial balance can be used to assess the financial position of a company between full annual audits.