Accounting Foundations, the Equation and Double Entry · Lesson 4

From transaction to journal, ledger and trial balance

10 min read

Lesson objectives

Trace a transaction from analysis to journal, ledger, and trial balance.
Calculate an account balance from posted movements and place it in the trial balance.
Explain what a trial balance can detect and what it may fail to detect.

From an event to a traceable record

Accounting recording does not stop when the journal entry is written. A foundational sequence is: identify and analyze the event, record it chronologically in the journal, post it to ledger accounts, and then list account balances in an unadjusted trial balance. This sequence preserves the transaction trail and allows a balance to be traced back to the movements that created it.

Identify the transaction and analyze its effects.
Record a journal entry with an appropriate date and description.
Post each side to its ledger account.
Determine balances and prepare an unadjusted trial balance.
Adjustments and financial statement preparation come later and are taught in Subject 2; they are not assumed complete here.

#	Simplified journal entry	Debit	Credit
1	Cash / Owner contribution	12,000 Cash	12,000 Owner contribution
2	Equipment / Cash	3,000 Equipment	3,000 Cash
3	Supplies / Accounts payable	1,000 Supplies	1,000 Accounts Payable
4	Cash / Service income	2,500 Cash	2,500 Service Income
5	Accounts payable / Cash	400 Accounts Payable	400 Cash
6	Rent expense / Cash	600 Rent Expense	600 Cash

Posting groups movements by account

Account	Ending balance	Balance side
Cash	10,500	Debit
Equipment	3,000	Debit
Supplies	1,000	Debit
Rent Expense	600	Debit
Accounts Payable	600	Credit
Owner contribution/equity	12,000	Credit
Service Income	2,500	Credit

A trial balance is not a certificate that everything is correct. An entire transaction can be omitted without disturbing debit and credit totals; the wrong account can be used while keeping the correct side and amount; a complete entry can be duplicated; and end-of-period adjustments may not yet have been recorded. Balance can reveal some errors, not all errors.

Error	Could it cause imbalance?	Why?
Equipment debit 3,000 but Cash credit only 300	Yes	Debits exceed credits by CU 2,700
Omit an on-account supplies purchase completely	Not necessarily	Neither side was recorded
Record a CU 3,000 expense in the wrong expense account with Cash credited 3,000	Not necessarily	Both sides and amount remain equal despite misclassification
Duplicate an entire entry with both sides	Not necessarily	Both sides are doubled together

Exercise

Exercise 1 — trace one transaction through the sequence: a business buys CU 750 of supplies on account. Write (a) the accounting-equation analysis, (b) the journal entry, (c) what will appear in the Supplies and Accounts Payable ledger accounts after posting, and (d) the side on which each balance appears in the trial balance if there are no other movements in those accounts.

Check your answer

Guided solution: (a) assets +750 and liabilities +750; equity is unchanged by the stated transaction. (b) Dr Supplies 750 / Cr Accounts Payable 750. (c) Supplies has a CU 750 debit movement and CU 750 debit balance; Accounts Payable has a CU 750 credit movement and CU 750 credit balance. (d) CU 750 appears in the debit column for Supplies and CU 750 in the credit column for Accounts Payable.

Exercise

Exercise 2 — which errors can leave the trial balance in balance? Choose and justify: (a) omit an entire transaction; (b) record a CU 900 debit and CU 90 credit; (c) use the wrong expense account while recording the same amount as a debit and crediting Cash for that same amount; (d) duplicate the entire entry. Then name an additional check, beyond comparing debit and credit totals, that could help detect each case.

Check your answer

Guided solution: (a), (c), and (d) can leave the trial balance balanced; (b) creates a CU 810 difference. To detect them: reconcile source events or documents to the journal for omissions; review the selected account against the event’s nature for misclassification; and inspect document references, dates, and duplicates for repeated recording. The trial balance is one control, not a substitute for traceability and review.

Lesson summary

Recording forms a traceable chain: analysis, journal, ledger, then unadjusted trial balance. In the extended case, debit and credit totals both equal CU 15,100. This proves arithmetic balance of the listed balances, not completeness or perfect classification; omissions, misclassifications, and duplicated balanced entries may leave the totals equal.