Perpetual Inventory Recording - TCE Accounting (Tasmania)
“Record inventory transactions under the perpetual system and reconcile to a stocktake.”
Under the perpetual inventory system, the Inventory account is updated every time goods are bought or sold, so its balance is meant to be current at all times. Each sale needs two entries: one for the selling price (revenue) and one for the cost of the goods (cost of goods sold and inventory reduction).
What this dot point is asking
The TASC course records inventory using the perpetual system, with the cost of goods sold given to you. Perpetual means continuous: every movement of stock is recorded as it happens, so the Inventory ledger account always shows what should be on hand. This contrasts with the periodic system, where inventory is only counted at period end.
Recording purchases
When goods are bought for resale, the cost goes straight into the asset account Inventory, not a Purchases account. A credit purchase of stock is recorded as debit Inventory, debit GST clearing, and credit Creditors Control for the total.
Recording a sale: two entries
Because the system tracks both the sale and the cost at the moment of sale, every sale has two parts.
- Entry 1 records the revenue: debit Cash or Debtors, credit Sales, credit GST clearing.
- Entry 2 records the cost: debit Cost of Goods Sold (an expense), credit Inventory.
Under perpetual inventory, a sale always produces a revenue entry and a cost entry. Forgetting the second entry leaves Inventory overstated and understates the cost of goods sold, so profit is wrong.
Inventory loss and the stocktake
Even with continuous records, a physical count (stocktake) may find less stock than the ledger shows, because of theft, breakage or errors. The difference is an inventory loss. The recorded balance is brought down to the counted figure with an adjustment.
The shortfall when the physical stocktake counts fewer goods than the perpetual Inventory account shows. It is recorded by debiting Inventory Loss (an expense) and crediting Inventory to reduce the asset to its true amount.
Worked example
A trader using the perpetual system buys stock on credit, makes a cash sale, and then discovers a discrepancy when the stock is counted at month end.
Step 1: Record the purchase of stock
When goods are bought for resale, the cost is an asset, not an expense, so Inventory is debited. GST paid on the purchase is an input tax credit, so it is debited to the GST clearing account. The full GST-inclusive amount owed to the supplier is credited to Creditors Control:
| Account | Debit | Credit |
|---|---|---|
| Inventory | $4,000 | |
| GST clearing | $400 | |
| Creditors Control | $4,400 |
Step 2: Record the sale (entry 1 - revenue)
The first of the two required entries records what the customer paid. Cash is debited for the full GST-inclusive receipt of . Sales is credited for the GST-exclusive base of , and GST clearing is credited for the GST collected on behalf of the ATO. Note that the GST inside a GST-inclusive price is the total divided by 11:
| Account | Debit | Credit |
|---|---|---|
| Cash | $2,200 | |
| Sales | $2,000 | |
| GST clearing | $200 |
Step 3: Record the sale (entry 2 - cost)
The second entry removes the cost of the goods from Inventory and records it as an expense. Without this entry, Inventory would remain overstated and Cost of Goods Sold would be understated, making gross profit too high:
| Account | Debit | Credit |
|---|---|---|
| Cost of Goods Sold | $1,300 | |
| Inventory | $1,300 |
Step 4: Calculate the Inventory ledger balance before the stocktake
The Inventory account moves with every purchase and every sale. Adding the purchase and subtracting the cost of the sale gives the balance the ledger says should be on hand:
Step 5: Record the inventory loss found at stocktake
The physical count reveals only on hand, which is less than the ledger shows. The shortfall is recorded as an expense (Inventory Loss) and Inventory is credited to reduce the asset to the counted figure:
| Account | Debit | Credit |
|---|---|---|
| Inventory Loss | $200 | |
| Inventory | $200 |
After this adjustment the Inventory account shows , matching the physical count.
Final answer: Inventory after the stocktake adjustment is ; the loss of is expensed as Inventory Loss.
Sales returns and purchase returns
Returns also need careful handling under the perpetual system. When a customer returns goods, reverse both the revenue entry (debit Sales Returns, debit GST clearing, credit Cash or Debtors) and the cost entry (debit Inventory, credit Cost of Goods Sold), because the goods physically come back into stock. When the business returns goods to a supplier, reverse the original purchase (debit Creditors Control, credit Inventory, credit GST clearing). Forgetting the cost side of a sales return leaves Inventory understated and overstates cost of goods sold.
A sales return is the mirror of a sale, so it needs two entries: one reversing revenue and GST, one bringing the cost of the returned goods back into Inventory. Only reversing the revenue half leaves the stock records wrong.
Cost flow and the value recorded
The amount debited to Cost of Goods Sold on each sale is the cost of those particular goods, which the TASC course normally provides. In practice a business needs a cost-flow assumption (such as first-in-first-out) to decide which cost applies when identical items were bought at different prices, but at this level you are usually given the cost per sale and focus on the recording. The key idea is that Inventory is always carried at cost, never at selling price, so the asset and the eventual gross profit are measured reliably.
Inventory and gross profit
Because the perpetual system records cost of goods sold continuously, gross profit (Sales less Cost of Goods Sold) can be read at any time, not just at period end. An inventory loss found at stocktake is treated as a separate expense rather than buried in cost of goods sold, which keeps the gross profit margin meaningful and highlights losses to management. This direct link to gross profit is why accurate inventory recording matters for the income statement and the efficiency ratios studied later.
Why this matters
Perpetual recording lets a business know its stock position and gross profit at any time without waiting for a count, which supports reordering and theft detection. Exam questions reward the second (cost) entry on every sale and the correct treatment of an inventory loss, both of which directly affect the gross profit reported later.
Under the perpetual system, stock bought for resale is an asset (debit Inventory), not an expense. The cost only becomes an expense (Cost of Goods Sold) when the goods are actually sold. Expensing purchases immediately distorts both the asset balance and profit.
Exam-style questions
Questions in the style of TASC exam questions on this dot point, each with a worked answer. They are written by ExamExplained unless tagged "Past paper"; the year shows the paper a question is modelled on.
Practice8 marksA trader using the perpetual system records the following in May: bought inventory on credit, base 7\,700 cash (including GST) that had cost 1\,100 (including GST) that had cost $650. Opening Inventory was $3\,000. Record the journal entries for each event and calculate the closing balance of the Inventory account before any stocktake.Show worked answer →
Each sale and sales return needs two entries under the perpetual system.
Purchase: Debit Inventory ; Debit GST clearing ; Credit Creditors Control .
Sale, revenue entry: Debit Cash ; Credit Sales ; Credit GST clearing . Cost entry: Debit Cost of Goods Sold ; Credit Inventory .
Sales return, reverse revenue: Debit Sales Returns ; Debit GST clearing ; Credit Cash (or Debtors) . Reverse cost (goods come back into stock): Debit Inventory ; Credit Cost of Goods Sold .
Inventory account: .
Markers reward the GST split on the purchase and sale, both entries per sale, the two-part sales return that restores cost to Inventory, and the correct closing Inventory balance.
Practice4 marksExplain the difference between the perpetual and periodic inventory systems and give one advantage of the perpetual system for management decision-making.Show worked answer →
A full 4 mark answer contrasts the two systems and links perpetual to a decision.
Under the perpetual system the Inventory account is updated continuously, with a cost entry made every time goods are sold, so the ledger shows the cost of goods on hand at any moment. Under the periodic system Inventory is not updated for each sale; cost of goods sold and closing inventory are only determined at period end after a physical stocktake.
An advantage of perpetual recording for management is that it provides up-to-date stock and gross profit figures at any time, which supports timely reordering, identifies slow-moving lines, and allows inventory losses (theft or error) to be detected by comparing the ledger to a stocktake. Markers reward the continuous-versus-period-end contrast, the point that perpetual records cost per sale, and a valid management advantage.