📘 OPENING & CLOSING INVENTORY: STEP-BY-STEP EXPLANATION WITH JOURNAL ENTRIES

Opening and Closing Inventory are important accounting concepts that directly affect the Cost of Goods Sold (COGS), Gross Profit, and financial position of a business.

Every trading and manufacturing business needs to determine the value of inventory available at the beginning of an accounting period and the value of goods remaining unsold at the end of the period. These figures help businesses calculate the cost of inventory sold and prepare accurate financial statements.

Let’s understand Opening Inventory and Closing Inventory through a practical business example, step-by-step calculations, journal entries, and important accounting rules.

🔹 STEP 1: UNDERSTAND OPENING INVENTORY

Opening Inventory is the value of goods available for sale at the beginning of an accounting period. It generally represents the closing inventory carried forward from the previous accounting period.

Practical Example

ABC Trading Inc. starts its financial year with inventory worth $50,000.

Opening Inventory = $50,000

This means ABC Trading Inc. has goods costing $50,000 available at the beginning of the year. These goods may be sold to customers during the current accounting period.

Why Is Opening Inventory Important?

• It forms part of the cost of goods available for sale.
• It is used to calculate the Cost of Goods Sold.
• It directly affects the calculation of Gross Profit.
• It helps accountants prepare the Trading Account under the traditional periodic inventory presentation.

Important Accounting Point: Opening Inventory is normally based on the previous period’s closing inventory. Therefore, an error in closing inventory at the end of one period can affect the opening inventory and reported profit of the next period.

🔹 STEP 2: UNDERSTAND CLOSING INVENTORY

Closing Inventory is the value of goods remaining unsold at the end of an accounting period. It represents inventory that the business expects to sell in a future period or use in its operations.

Practical Example

At the end of the financial year, ABC Trading Inc. physically counts its inventory and determines that the cost of unsold goods is $40,000.

Closing Inventory = $40,000

This means the business has goods costing $40,000 remaining in stock at the reporting date. Because these goods have not yet been sold, their cost should not be included in the current period’s Cost of Goods Sold.

Why Is Closing Inventory Important?

• It reduces the Cost of Goods Sold for the current period.
• It affects the calculation of Gross Profit.
• It is generally presented as a current asset in the Balance Sheet.
• It helps ensure that the cost of unsold goods is carried forward to the appropriate accounting period.
• It supports accurate inventory valuation and financial reporting.

Important Accounting Point: Closing Inventory should be determined using an appropriate inventory count or reliable inventory records and valued according to the applicable accounting framework.

🔹 STEP 3: CALCULATE COST OF GOODS SOLD (COGS)

The Cost of Goods Sold (COGS) represents the cost of inventory sold during an accounting period. For a trading business, it is calculated by adding Opening Inventory and Net Purchases and then deducting Closing Inventory, with appropriate adjustments where necessary.

Practical Business Example

Assume ABC Trading Inc. has the following inventory details for the year:

COGS Formula

COGS = Opening Inventory + Net Purchases − Closing Inventory

Calculation:

COGS = $50,000 + $200,000 − $40,000

COGS = $250,000 − $40,000

✅ Cost of Goods Sold = $210,000

Explanation

ABC Trading Inc. had goods costing $250,000 available for sale during the year. Out of this amount, goods costing $40,000 remained unsold at year-end. Therefore, the cost attributable to goods sold during the period is $210,000.

This calculation assumes that the net purchases figure includes the relevant purchase adjustments and that no other inventory-cost adjustments are required.

What Are Net Purchases?

Net Purchases generally represent purchases after deducting purchase returns and applicable purchase allowances or discounts, according to the business’s accounting policy.

Net Purchases = Gross Purchases − Purchase Returns − Applicable Purchase Allowances

Eligible freight-in and other costs necessary to bring inventory to its present location and condition may also be included in inventory cost, where applicable. Selling expenses and unrelated administrative expenses are not automatically included in inventory cost.

🔹 STEP 4: JOURNAL ENTRY FOR OPENING INVENTORY

Under the traditional periodic inventory presentation, Opening Inventory is transferred to the debit side of the Trading Account to calculate the cost of goods available for sale and determine Gross Profit.

Journal Entry

Entry:

Trading Account Dr. $50,000
To Opening Inventory Account $50,000

Explanation: Opening Inventory is transferred to the debit side of the Trading Account under this traditional presentation. This allows the business to include the opening stock in the cost of goods available for sale.

Accounting Logic

• Debit: Trading Account, to include Opening Inventory in the calculation of the cost of goods available for sale.
• Credit: Opening Inventory Account, to transfer its balance in the traditional accounting presentation.

Note: This is a traditional educational journal-entry format. Actual entries depend on the accounting system and whether the business uses a periodic or perpetual inventory method.

🔹 STEP 5: JOURNAL ENTRY FOR CLOSING INVENTORY

Under the traditional periodic inventory approach, Closing Inventory is recognised as an asset and credited to the Trading Account for the purpose of calculating Gross Profit.

Journal Entry

Entry:

Closing Inventory Account Dr. $40,000
To Trading Account $40,000

Explanation: Closing Inventory is recognised as an asset, while its cost is deducted from the goods available for sale when calculating Cost of Goods Sold.

Accounting Logic

• Debit: Closing Inventory Account, recognising the inventory asset.
• Credit: Trading Account, reducing the cost charged against the current period’s sales.

Closing Inventory is generally presented as a current asset in the Balance Sheet, subject to applicable accounting requirements and the business’s reporting framework.

Note: In a perpetual inventory system, inventory records are updated as transactions occur, so year-end inventory adjustments may differ from the traditional periodic method.

🔹 STEP 6: CALCULATE GROSS PROFIT

Gross Profit is the difference between Net Sales and the Cost of Goods Sold. It shows the profit earned from selling goods before deducting operating expenses and other expenses.

Practical Example

Assume ABC Trading Inc. reports Net Sales of $300,000 during the year.

• Net Sales = $300,000
• Cost of Goods Sold = $210,000

Gross Profit Formula

Gross Profit = Net Sales − Cost of Goods Sold

Calculation:

Gross Profit = $300,000 − $210,000

✅ Gross Profit = $90,000

Explanation

ABC Trading Inc. earned a Gross Profit of $90,000 after deducting the cost of goods sold from Net Sales.

However, this is not the company’s final Net Profit. Operating expenses, salaries, rent, depreciation, finance costs, taxes, and other applicable expenses must be considered to calculate Net Profit.

🔹 STEP 7: UNDERSTAND THE IMPACT OF INVENTORY ON PROFIT

Opening Inventory and Closing Inventory directly affect the calculation of Cost of Goods Sold and therefore influence Gross Profit.

Impact of Opening Inventory

When Opening Inventory increases, the Cost of Goods Sold generally increases, assuming other figures remain unchanged. This generally reduces Gross Profit.

Impact of Closing Inventory

When Closing Inventory increases, the Cost of Goods Sold generally decreases, assuming other figures remain unchanged. This generally increases Gross Profit.

Important: These effects assume that sales, purchases, inventory costing, and all other relevant factors remain unchanged. Inventory must always be valued accurately; it should never be adjusted merely to achieve a desired profit figure.

🔹 STEP 8: INVENTORY VALUATION UNDER IAS 2

IAS 2, Inventories, is an International Financial Reporting Standard that explains how inventory should be measured and reported by entities applying IFRS Accounting Standards.

Under IAS 2, inventories are generally measured at the lower of cost and net realisable value (NRV).

What Is Cost?

Inventory cost generally includes:

• Costs of purchase, including eligible purchase-related costs.
• Costs of conversion, where applicable.
• Other costs incurred in bringing inventory to its present location and condition.

What Is Net Realisable Value?

Net Realisable Value is the estimated selling price in the ordinary course of business, less the estimated costs of completion and the estimated costs necessary to make the sale.

Example

A business holds inventory with a recorded cost of $40,000. At the reporting date, the estimated selling price less the relevant completion and selling costs is $37,000.

• Inventory Cost = $40,000
• Net Realisable Value = $37,000

Because NRV is lower than cost, the inventory is generally measured at $37,000 under IAS 2.

Accounting takeaway: Inventory valuation affects both the amount of the inventory asset reported in the Balance Sheet and the expense recognised in profit or loss.

🔹 STEP 9: ACCOUNTING TAKEAWAYS

• ✔ Opening Inventory represents goods available at the beginning of the accounting period.
• ✔ Closing Inventory represents goods remaining unsold at the end of the accounting period.
• ✔ COGS Formula: Opening Inventory + Net Purchases − Closing Inventory, subject to relevant adjustments.
• ✔ Gross Profit Formula: Net Sales − Cost of Goods Sold.
• ✔ Closing Inventory generally reduces COGS and is reported as a current asset.
• ✔ Opening Inventory is generally carried forward from the previous accounting period’s closing inventory.
• ✔ Inventory should be valued using the applicable accounting framework and consistent costing policies.
• ✔ Under IAS 2, inventory is generally measured at the lower of cost and net realisable value.

💬 TEST YOUR KNOWLEDGE

Let’s check your understanding with a practical accounting question.

Question: A company has the following inventory details for the year:

• Opening Inventory: $80,000
• Net Purchases: $250,000
• Closing Inventory: $60,000

What is the Cost of Goods Sold (COGS)?

A) $190,000
B) $270,000
C) $330,000
D) $390,000

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