From Transactions to a Trial Balance
A transaction set is easiest to handle when each stage is kept distinct: identify the accounts affected, journalize the transaction, post the journal amounts to the ledger, calculate each ending balance, and use those balances to prepare a trial balance. Errors often arise when a correct entry is posted to the wrong account, a credit balance is treated as a debit balance, or a transaction is omitted while moving from one stage to the next.
This tutorial works through that entire sequence. The examples use a hypothetical service business and include owner contributions, revenue, expenses, borrowing, receivables, payables, and collections. They stop at the unadjusted trial balance: no period-end adjusting entries are included.
For this process, an asset or expense increase is recorded as a debit; a liability, owner’s capital, or revenue increase is recorded as a credit. Decreases use the opposite side. The relevant account rules are applied to each transaction before posting. A debit is not inherently an increase in every account, and a credit is not inherently a decrease.
A trial balance is a check on the equality of recorded debits and credits. It does not establish that every transaction was recorded, that every account was classified correctly, or that the underlying records are free of error.
A Reliable End-to-End Method
Identify what the business received or gave up, and whether cash, a receivable, a payable, borrowing, revenue, an expense, or owner’s capital is affected.
Name every affected account, determine whether it is debited or credited, and ensure the entry’s total debits equal its total credits.
Transfer each debit and credit to the corresponding account. Do not post only the cash portion of a transaction when other accounts are also affected.
Combine the postings in each account, taking account of its debit or credit balance, to find the ending balance.
List each nonzero account balance in its proper column, then compare total debits with total credits.
Why the Trial Balance Totals Agree
Each journal entry has equal debits and credits. Posting transfers those same amounts from the journal to ledger accounts; it does not change their totals. Thus, when all entries are posted, the total debit postings across all accounts equal the total credit postings across all accounts. Calculating balances preserves the accounting equality: the net debit-side balances must equal the net credit-side balances, provided the postings and balance calculations are done consistently.
The implication gives a useful arithmetic check, not a complete audit. For example, a transaction omitted entirely leaves no unbalanced entry to detect. Likewise, recording a payment in the wrong expense account can preserve equal totals. The trial balance tests equality of the listed balances, not whether every accounting decision was correct.
Worked Examples
Worked Example: A Small Service Business From Investment to Trial Balance
A hypothetical business has these transactions during its first week: the owner contributes $15,000 cash; the business buys equipment for $3,000 cash; it earns and receives $2,400 for services; it pays $700 rent; it buys $500 of supplies on credit; and it pays the supplier $200. Journalize the transactions, calculate ledger balances, and prepare the unadjusted trial balance.
Method. Analyze each event in order, write a balanced journal entry, and post each amount to its account. The credit purchase creates a supplies asset and an accounts payable liability; paying part of the supplier balance reduces cash and accounts payable, not supplies expense.
| Event | Debit | Credit |
|---|---|---|
| Owner contributes cash | Cash $15,000 | Owner’s Capital $15,000 |
| Equipment purchased for cash | Equipment $3,000 | Cash $3,000 |
| Services performed for cash | Cash $2,400 | Service Revenue $2,400 |
| Rent paid | Rent Expense $700 | Cash $700 |
| Supplies purchased on credit | Supplies $500 | Accounts Payable $500 |
| Part of supplier balance paid | Accounts Payable $200 | Cash $200 |
Post and calculate balances. Cash has a $15,000 debit, followed by credits of $3,000, $700, and $200, and a debit of $2,400. Its ending debit balance is $15,000 − $3,000 + $2,400 − $700 − $200 = $13,500. Equipment has a $3,000 debit balance; Supplies has a $500 debit balance; and Rent Expense has a $700 debit balance. Accounts Payable has a $500 credit followed by a $200 debit, leaving a $300 credit balance. Owner’s Capital is $15,000 credit, and Service Revenue is $2,400 credit.
Trial balance and check. The debit total is $13,500 + $3,000 + $500 + $700 = $17,700. The credit total is $300 + $15,000 + $2,400 = $17,700.
| Account | Debit | Credit |
|---|---|---|
| Cash | $13,500 | |
| Equipment | $3,000 | |
| Supplies | $500 | |
| Rent Expense | $700 | |
| Accounts Payable | $300 | |
| Owner’s Capital | $15,000 | |
| Service Revenue | $2,400 | |
| Total | $17,700 | $17,700 |
Common mistake avoided: recording the $200 supplier payment as an expense would debit the wrong account. The original supplies purchase already recorded the asset and payable; paying the payable reduces that liability.
Worked Example: Borrowing, Equipment on Credit, and Customer Collections
A hypothetical consulting firm begins the month with no balances. The owner contributes $8,000 cash. The firm borrows $5,000 from a bank, buys equipment costing $6,200 by paying $2,000 cash and agreeing to pay the vendor the rest later, earns $3,100 in consulting revenue ($1,900 received in cash and $1,200 billed to a customer), collects $700 from a customer with an existing receivable, pays $450 for utilities, and pays the equipment vendor $1,500. Find the ledger balances and prepare the trial balance.
Method. Use a compound entry when one event affects more than two accounts. For the equipment purchase, debit Equipment for its full cost and credit Cash and Accounts Payable for the portions paid and owed. For the services, debit Cash and Accounts Receivable and credit the full revenue earned.
| Event | Debit | Credit |
|---|---|---|
| Owner contribution | Cash $8,000 | Owner’s Capital $8,000 |
| Bank loan received | Cash $5,000 | Notes Payable $5,000 |
| Equipment purchased partly on credit | Equipment $6,200 | Cash $2,000; Accounts Payable $4,200 |
| Consulting services earned | Cash $1,900; Accounts Receivable $1,200 | Consulting Revenue $3,100 |
| Customer account collected | Cash $700 | Accounts Receivable $700 |
| Utilities paid | Utilities Expense $450 | Cash $450 |
| Payment to equipment vendor | Accounts Payable $1,500 | Cash $1,500 |
Post and calculate balances. Cash is $8,000 + $5,000 − $2,000 + $1,900 + $700 − $450 − $1,500 = $11,650 debit. Accounts Receivable is $1,200 − $700 = $500 debit. Equipment is $6,200 debit. Accounts Payable is $4,200 − $1,500 = $2,700 credit. Notes Payable is $5,000 credit, Owner’s Capital is $8,000 credit, Consulting Revenue is $3,100 credit, and Utilities Expense is $450 debit.
Trial balance and check. Debits total $11,650 + $500 + $6,200 + $450 = $18,800. Credits total $2,700 + $5,000 + $8,000 + $3,100 = $18,800.
| Account | Debit | Credit |
|---|---|---|
| Cash | $11,650 | |
| Accounts Receivable | $500 | |
| Equipment | $6,200 | |
| Utilities Expense | $450 | |
| Accounts Payable | $2,700 | |
| Notes Payable | $5,000 | |
| Owner’s Capital | $8,000 | |
| Consulting Revenue | $3,100 | |
| Total | $18,800 | $18,800 |
Common mistake avoided: recording only the $1,900 cash received as revenue would omit $1,200 of earned revenue and the matching receivable. The entry must reflect both forms of consideration for the services.
Worked Example: Combining Several Transactions Before Balancing
A hypothetical design studio records the following: the owner contributes $20,000 cash; the studio borrows $6,000; it purchases $900 of supplies on credit; it performs services worth $4,800, receiving $2,800 cash and billing the remainder; it collects $1,250 from customers; it pays wages of $1,100 and rent of $800; and it pays $350 to its supplies vendor. Prepare the journal entries, ledger balances, and trial balance.
Method. Journalize each event separately so the sequence remains traceable. The services entry divides the $4,800 between cash and receivable: $4,800 − $2,800 = $2,000 billed. Collection of $1,250 reduces receivables; it does not create new revenue.
| Event | Debit | Credit |
|---|---|---|
| Owner contribution | Cash $20,000 | Owner’s Capital $20,000 |
| Loan received | Cash $6,000 | Notes Payable $6,000 |
| Supplies purchased on credit | Supplies $900 | Accounts Payable $900 |
| Services performed | Cash $2,800; Accounts Receivable $2,000 | Service Revenue $4,800 |
| Customer collections | Cash $1,250 | Accounts Receivable $1,250 |
| Wages and rent paid | Wages Expense $1,100; Rent Expense $800 | Cash $1,900 |
| Part of supplies payable paid | Accounts Payable $350 | Cash $350 |
Post and calculate balances. Cash is $20,000 + $6,000 + $2,800 + $1,250 − $1,900 − $350 = $27,800 debit. Accounts Receivable is $2,000 − $1,250 = $750 debit. Supplies is $900 debit. Accounts Payable is $900 − $350 = $550 credit. Notes Payable is $6,000 credit, Owner’s Capital is $20,000 credit, and Service Revenue is $4,800 credit. Wages Expense is $1,100 debit and Rent Expense is $800 debit.
Trial balance and check. Debits total $27,800 + $750 + $900 + $1,100 + $800 = $31,350. Credits total $550 + $6,000 + $20,000 + $4,800 = $31,350.
| Account | Debit | Credit |
|---|---|---|
| Cash | $27,800 | |
| Accounts Receivable | $750 | |
| Supplies | $900 | |
| Wages Expense | $1,100 | |
| Rent Expense | $800 | |
| Accounts Payable | $550 | |
| Notes Payable | $6,000 | |
| Owner’s Capital | $20,000 | |
| Service Revenue | $4,800 | |
| Total | $31,350 | $31,350 |
Common mistake avoided: cash collection on an existing receivable is not a second revenue event. The debit to Cash is matched by a credit to Accounts Receivable, reducing the customer balance from $2,000 to $750.
Reading the Result Carefully
When the trial balance columns agree, verify the process in more than one way. First, check that every journal entry has equal debits and credits. Next, compare each journal posting with the account ledger and confirm that each account’s ending balance is in the appropriate column. Finally, add the trial balance columns independently. This layered check can help locate an arithmetic or posting error more quickly than simply recalculating the final totals.
A disagreement between the columns indicates that at least one amount, side, posting, or balance calculation is inconsistent. Equal columns, however, do not prove that the entries were complete or classified correctly. For instance, omitting a transaction entirely or debiting an incorrect expense account can leave the trial balance balanced. The trial balance is therefore a control check on debit-credit equality, not proof that the records are error-free.
Check Your Understanding
For each problem, determine the ending ledger balances and the debit and credit totals of the unadjusted trial balance.
- A new business receives $9,000 from its owner, buys equipment for $2,400 cash, earns $1,600 cash revenue, and pays $300 rent. What are the ending Cash, Equipment, Rent Expense, Owner’s Capital, and Revenue balances, and what are the equal trial balance totals? (Answer: Cash $7,900 debit; Equipment $2,400 debit; Rent Expense $300 debit; Owner’s Capital $9,000 credit; Revenue $1,600 credit; both totals $10,600.)
- A business borrows $4,000, performs $2,600 of services on account, collects $1,000 from customers, and pays $650 rent. Find its ending Cash, Accounts Receivable, Notes Payable, Rent Expense, and Revenue balances. (Answer: Cash $4,350 debit; Accounts Receivable $1,600 debit; Notes Payable $4,000 credit; Rent Expense $650 debit; Revenue $2,600 credit; both trial balance totals $6,600.)
- An owner contributes $12,000 cash. The business buys $800 of supplies on credit, earns $4,000 of service revenue ($2,200 cash and the rest on account), collects $500 from customers, and pays the supplier $300. Determine the ending balances and trial balance totals. (Answer: Cash $14,400 debit; Accounts Receivable $1,300 debit; Supplies $800 debit; Accounts Payable $500 credit; Owner’s Capital $12,000 credit; Service Revenue $4,000 credit; both totals $16,500.)
- A business receives $5,000 from its owner and a $3,000 bank loan, buys equipment for $2,500 cash, earns $1,400 on account, pays $600 wages, and collects $900 from customers. Find its ending balances and trial balance totals. (Answer: Cash $5,800 debit; Equipment $2,500 debit; Accounts Receivable $500 debit; Wages Expense $600 debit; Notes Payable $3,000 credit; Owner’s Capital $5,000 credit; Revenue $1,400 credit; both totals $9,400.)
- A business receives a $7,000 owner contribution and a $2,000 loan, buys $1,200 of supplies on credit, earns $2,000 revenue ($900 cash and $1,100 billed), pays $500 to the supplier and $400 rent. Calculate ending balances and the trial balance totals. (Answer: Cash $9,000 debit; Accounts Receivable $1,100 debit; Supplies $1,200 debit; Rent Expense $400 debit; Accounts Payable $700 credit; Notes Payable $2,000 credit; Owner’s Capital $7,000 credit; Revenue $2,000 credit; both totals $11,700.)