The Grammar of Commerce
Every journal entry answers three questions: what happened, which accounts move, and by how much. Master the pattern for ten common transactions and you can record a hundred — because business events are variations on a small set of themes.
Cash sale: Dr Cash, Cr Sales Revenue. Asset up, revenue up.
Credit sale: Dr Accounts Receivable, Cr Sales Revenue. The asset is a promise to pay, not cash yet — but revenue is recognized at sale, not at collection (the accrual principle: events are recorded when they happen, not when cash moves).
Purchase of inventory on credit: Dr Inventory, Cr Accounts Payable. One asset arrives, one obligation is born.
Payment to supplier: Dr Accounts Payable, Cr Cash. The obligation shrinks, so does the cash.
Receipt from customer: Dr Cash, Cr Accounts Receivable. Cash arrives, the promise is extinguished.
Wages paid: Dr Wages Expense, Cr Cash. An expense is born and cash leaves.
Owner investment: Dr Cash, Cr Share Capital. Cash arrives from outside the firm; equity grows.
Loan received: Dr Cash, Cr Loan Payable. Cash arrives; a liability is born.
Depreciation: Dr Depreciation Expense, Cr Accumulated Depreciation. No cash moves — the entry allocates an asset's cost over its useful life, reducing both the asset's book value and the period's profit.
Dividend payment: Dr Retained Earnings (or Dividends), Cr Cash. Equity shrinks, cash leaves.
Notice the accrual principle running through everything: revenue at sale (not collection), expenses at incurrence (not payment), depreciation over the asset's life (not at purchase). Cash-basis accounting waits for the bank statement; accrual-basis accounting tells you what really happened this period, which is why every set of published financial statements uses accrual.
The core entry patterns
| Event | Debit | Credit |
|---|---|---|
| Cash sale | Cash | Sales revenue |
| Credit sale | Accounts receivable | Sales revenue |
| Buy inventory on credit | Inventory | Accounts payable |
| Pay supplier | Accounts payable | Cash |
| Collect from customer | Cash | Accounts receivable |
| Pay wages | Wage expense | Cash |
| Take a loan | Cash | Loan payable |
Tip: The accrual principle decides the when: revenue at delivery, expense when incurred — cash movement is a separate, later story. Once that clicks, every entry above writes itself.