The accounting equation and transaction evidence

Learning goals

• Apply Assets = Liabilities + Equity to business events.
• Separate owner, business, and non-transaction events.
• Use source documents to determine accounts, amounts, and timing.
• Explain the effect of revenue, expense, investment, and distribution on equity.
• Perform a reasonableness and balance check before recording.

Prerequisite check

1. Why was a customer deposit a liability in Lesson 1?
2. Which increases equity: owner investment, revenue, both, or neither? Explain the difference.

Vocabulary

• Transaction: an event that can be measured reliably enough and changes the entity's assets, liabilities, or equity.
• Source document: evidence such as an invoice, receipt, bank notice, contract, time record, or shipping record.
• Account: a record for one asset, liability, equity, revenue, or expense category.
• Owner contribution: resources invested by an owner; not revenue.
• Distribution/withdrawal: resources transferred to an owner; not an expense.
• On account: payment occurs after the purchase or sale, creating a receivable or payable.

Core idea

Every recorded transaction preserves:

Assets = Liabilities + Equity

Expanded for learning:

Assets = Liabilities + Contributed capital + Revenues − Expenses − Distributions

The equation is a classification and logic tool. A balanced equation is necessary, but it does not prove the account, amount, date, or business purpose is correct. Evidence supplies those details.

Why this treatment makes sense

The business is the reporting entity. An owner's personal purchase does not become a business expense merely because the business card was used. A signed contract alone may create rights and obligations but not always a recognized transaction; performance, control, measurement, and the applicable framework matter. Analyze substance before choosing accounts.

A repeatable method

Use EVIDENCE:

1. Entity: Does this belong to the business?
2. Verify: What document, date, counterparty, terms, tax, and authorization exist?
3. Identify accounts and their elements.
4. Direction: Does each account increase or decrease?
5. Equation: Confirm equal effects on both sides.
6. Narrate the economic event in one sentence.
7. Cross-check cash/credit terms and GST/HST treatment.
8. Enter only after gaps are resolved.

Worked example

On May 1, Cedar Loop Design begins operations. Ignore sales taxes for this foundational example.

Ending balances:

• Assets: Cash $18,200 + Accounts Receivable $2,500 + Supplies $2,400 + Equipment $8,000 = $31,100.
• Liabilities: Accounts Payable $1,500.
• Equity: Contributions $25,000 + Revenue $6,500 − Expense $1,200 − Distribution $700 = $29,600.
• Check: $31,100 = $1,500 + $29,600.

Journal, ledger, and statement connection

Transaction 4 will become a debit to Accounts Receivable and credit to Service Revenue. The receivable ledger identifies who owes the $6,500. Revenue flows to the income statement and, after closing, into retained earnings/owner capital. Collection later changes only asset composition; it is not new revenue.

Transaction 2 is not an $8,000 expense on purchase. Equipment provides future economic benefit; later periods generally receive depreciation expense as the depreciable amount is allocated. Recognition details depend on the reporting basis.

Common mistakes

• Recording a quote or purchase order as if goods were received.
• Treating collection of a receivable as revenue twice.
• Treating a contribution as revenue or a distribution as expense.
• Netting Equipment against Cash and concluding “nothing happened.” Asset mix and liquidity changed.
• Ignoring HST embedded in a real invoice. Registered entities commonly separate recoverable input tax credits; eligibility and rate must be verified.
• Assuming a balanced analysis cannot contain two equal and opposite errors.

Guided practice

For Lakeview Tutoring Inc., ignore sales tax and analyze each event:

1. Shareholders invest $40,000 cash.
2. The company signs a one-year office lease; no amount is yet due or paid.
3. It receives $3,000 cash before delivering an exam-prep workshop next month.
4. It delivers $1,800 of tutoring previously billed to nobody and receives cash immediately.
5. It pays an employee $650 for this week's work.
6. A shareholder's $120 personal dinner is paid from the company bank account and will not be repaid.

Independent practice

Open a six-column transaction table for Aurora Repair Co. Beginning balances are zero. Analyze: owner contributes $18,000; tools purchased for $6,200 cash; parts purchased for $2,700 on account; repair services of $5,400 performed, $3,900 cash and $1,500 on account; $1,100 wages paid; $800 collected from the receivable; $1,000 paid to supplier; $500 owner withdrawal. Compute ending Cash, A/R, Parts, Tools, A/P, and Equity. Identify one source document for each event.

Self-check and solutions

Guided: (1) Cash +40,000; contributed capital +40,000. (2) Usually no entry at signing in this simple fact pattern; confirm lease terms and applicable guidance. (3) Cash +3,000; liability +3,000. (4) Cash +1,800; revenue/equity +1,800. (5) Cash −650; wage expense/equity −650. (6) Cash −120; distribution/equity −120, not meal expense, assuming no repayment and proper authorization.

Independent balances: Cash = 18,000 − 6,200 + 3,900 − 1,100 + 800 − 1,000 − 500 = $13,900. A/R = 1,500 − 800 = $700. Parts = $2,700. Tools = $6,200. A/P = 2,700 − 1,000 = $1,700. Equity = 18,000 + 5,400 − 1,100 − 500 = $21,800. Check: assets $23,500 = liabilities $1,700 + equity $21,800.

Reasoning check: parts usage was not stated, so do not invent parts expense. The $800 collection is not revenue. Evidence might include a deposit record, tool and parts invoices, customer work orders/invoices, payroll register, customer remittance, supplier remittance, and withdrawal authorization.

Retrieval practice

1. Write the expanded accounting equation.
2. What is the difference between revenue earned on account and cash collected on account?
3. Name three facts to verify on a source document.
4. Give one example of a balanced but wrong entry.

Exam-style application

A student records a $4,000 cash collection from a customer as Dr Cash / Cr Service Revenue. The work had been billed and recorded last month. Show the correct entry, quantify the current error, and state the statement effect if uncorrected.

Target: Dr Cash $4,000 / Cr Accounts Receivable $4,000. The student's credit overstates current revenue, profit, and equity by $4,000 and leaves A/R overstated by $4,000. Cash is correct, so a bank reconciliation alone would not catch it.

Lesson summary

Classify the entity and evidence first, then identify account directions and prove the equation. Revenue, collections, contributions, and borrowing can all bring in cash but have different effects.