Which Of The Following Is A True Statement About Inventory Systems? (Accounting MCQ Explained)
Inventory systems are a fundamental concept in accounting because they help businesses track merchandise, determine the cost of goods sold, and prepare accurate financial statements.
When studying inventory accounting, one of the most common areas of confusion is understanding the difference between a Perpetual Inventory System and a Periodic Inventory System.
This multiple-choice question tests whether you understand how each system records inventory transactions and when the cost of goods sold is calculated.
Question: Which of the Following Is a True Statement About Inventory Systems?
A) Periodic inventory systems require more detailed inventory records.
B) Perpetual inventory systems require more detailed inventory records.
C) A periodic system requires cost of goods sold to be determined after each sale.
D) A perpetual system determines cost of goods sold only at the end of the accounting period.
Correct Answer: B) Perpetual Inventory Systems Require More Detailed Inventory Records
The correct answer is Option B.
A Perpetual Inventory System (PIS) requires more detailed inventory records because it continuously updates the Inventory Account whenever inventory-related transactions occur.
Every purchase, sale, return, allowance, discount, and freight cost is recorded immediately. This allows a business to know its current inventory balance and cost of goods sold at any point in time.
In simple terms:
Perpetual system = continuous tracking of inventory
Periodic system = inventory updated at the end of the accounting period
How Does a Perpetual Inventory System Work?
Under the perpetual inventory method, businesses record inventory changes directly in the Inventory Account instead of using separate purchase-related accounts.
This detailed record-keeping provides accurate and up-to-date inventory information but requires more accounting entries.
1. Recording Inventory Purchases
When merchandise is purchased on account under a perpetual inventory system, the entry is:
Debit: Inventory Account
Credit: Accounts Payable
The company does not use a separate Purchases Account.
This is different from a periodic inventory system, where purchases are recorded separately.
2. Recording Freight-In or Transportation Costs
Freight costs paid to bring inventory to the business increase the total cost of inventory.
Under the perpetual system:
Debit: Inventory Account
Credit: Cash or Accounts Payable
The transportation cost becomes part of inventory cost rather than being recorded in a separate Freight-In account.
3. Recording Purchase Returns, Allowances, and Discounts
When a company returns goods to a supplier or receives a purchase discount, the Inventory Account is adjusted directly.
For example:
Goods returned to supplier → Inventory decreases
Purchase discount received → Inventory cost decreases
Separate accounts for:
Purchase Returns and Allowances
Purchase Discounts
are generally not maintained in a perpetual inventory system.
4. Recording Sales Under a Perpetual Inventory System
A sale requires two accounting entries because the company must record both the revenue earned and the reduction in inventory.
First Entry: Record the Sale
Debit: Cash or Accounts Receivable
Credit: Sales Revenue
Second Entry: Record Cost of Goods Sold
Debit: Cost of Goods Sold
Credit: Inventory
This second entry updates inventory immediately and recognizes the expense related to the goods sold.
Because these records are updated after every transaction, perpetual inventory systems require more detailed accounting records.
Why Option A Is Incorrect
A) Periodic inventory systems require more detailed inventory records.
This statement is incorrect.
A Periodic Inventory System does not continuously update inventory records. Instead, the business determines ending inventory through a physical count at the end of the accounting period.
Under this method, companies maintain separate accounts such as:
Purchases
Purchase Returns and Allowances
Purchase Discounts
Freight-In
For example, when inventory is purchased:
Debit: Purchases Account
Credit: Cash or Accounts Payable
The Inventory Account is not updated immediately.
At the end of the period, the company calculates ending inventory and cost of goods sold.
Therefore, a periodic system requires fewer detailed inventory records compared with a perpetual system.
Why Option C Is Incorrect
C) A periodic system requires cost of goods sold to be determined after each sale.
This statement is false.
A periodic inventory system does not calculate cost of goods sold after every transaction.
Instead, cost of goods sold is calculated only at the end of the accounting period using the formula:
Beginning Inventory + Purchases − Ending Inventory = Cost of Goods Sold
The company must first determine ending inventory through a physical inventory count.
Why Option D Is Incorrect
D) A perpetual system determines cost of goods sold only at the end of the accounting period.
This statement is incorrect because it describes the periodic inventory system.
In a perpetual inventory system, cost of goods sold is recorded immediately whenever a sale occurs.
This means management can access updated information about:
Inventory available
Inventory sold
Cost of goods sold
Inventory value
without waiting until the end of the accounting period.
Perpetual vs. Periodic Inventory System: Key Differences
| Feature | Perpetual Inventory System | Periodic Inventory System |
|---|---|---|
| Inventory records | Updated continuously | Updated at period-end |
| Cost of goods sold | Recorded after each sale | Calculated at the end of the period |
| Inventory account | Updated after every transaction | Adjusted after physical count |
| Purchase account used | No | Yes |
| Record-keeping detail | More detailed | Less detailed |
| Technology requirement | Often uses inventory software | Can be maintained with simpler records |
Why Do Businesses Use a Perpetual Inventory System?
Many modern businesses prefer perpetual inventory systems because they provide real-time information that helps with:
Better inventory control
Faster decision-making
Reducing inventory shortages
Identifying theft or errors
Preparing accurate financial reports
Retail stores, supermarkets, and e-commerce businesses commonly use perpetual systems because they process a large number of inventory transactions every day.
Final Answer and Key Learning Point
The correct answer is:
✅ B) Perpetual inventory systems require more detailed inventory records.
A perpetual inventory system requires detailed records because every inventory transaction is recorded immediately. Purchases, sales, returns, discounts, and freight costs directly affect the Inventory Account.
A periodic inventory system, on the other hand, updates inventory only at the end of the accounting period and calculates cost of goods sold after determining ending inventory.
Remember this simple rule:
Perpetual = Records inventory continuously
Periodic = Updates inventory periodically
Understanding this difference makes inventory accounting questions much easier to solve and helps build a strong foundation in financial accounting.
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