FIFO vs Weighted Average Under IFRS: Choosing an Inventory Cost Method

For UAE trading, retail, distribution, and manufacturing businesses, inventory costing can directly affect reported gross profit, closing inventory and the cost of goods sold. Choosing between FIFO and weighted average is therefore more than an accounting preference. It can influence how management evaluates margins and how financial statements reflect inventory movements.

Under IAS 2, businesses generally use either the first-in, first-out (FIFO) or weighted average cost formula for inventories that are ordinarily interchangeable. Understanding FIFO vs Weighted Average IFRS is essential for businesses preparing IFRS-based financial statements in the UAE, particularly when purchase prices fluctuate and inventory values affect reported financial results.

What Does IAS 2 Say About Inventory Costing?

IAS 2 Inventories establishes the accounting treatment for inventory, including how inventory costs are determined and subsequently recognised as an expense.

Under IAS 2, inventory cost includes costs of purchase, costs of conversion and other costs incurred in bringing inventory to its present location and condition. For ordinarily interchangeable inventory, the standard permits two cost formulas:

• First-in, first-out (FIFO)
• Weighted average cost

For items that are not ordinarily interchangeable or are segregated for specific projects, specific identification of individual costs may be appropriate.

IAS 2 also requires inventory to be measured at the lower of cost and net realisable value (NRV). This means simply calculating the historical cost is not always enough; businesses also need to consider whether inventory can still be recovered through its expected sale.

Why IAS 2 Matters for UAE Businesses

The UAE Federal Tax Authority states that financial statements for UAE Corporate Tax purposes should be prepared using accounting standards accepted in the UAE, with IFRS being the most frequently used accounting standard.

Therefore, businesses using IFRS need a consistent and properly documented approach to IAS 2 inventory costing.

What Is the FIFO Inventory Method?

FIFO means first in, first out. The method assumes that the inventory purchased or produced first is sold first. As a result, the units remaining in closing inventory are generally associated with the most recent purchases.

For example, suppose a UAE distributor purchases:

Purchase	Quantity	Cost per unit
First purchase	100 units	AED 20
Second purchase	100 units	AED 25
Third purchase	100 units	AED 30

If the business sells 150 units, FIFO assumes that the first 100 units sold cost AED 20 each and the next 50 cost AED 25 each.

Therefore:

COGS = (100 × AED 20) + (50 × AED 25) = AED 3,250

The remaining 150 units consist of:

• 50 units at AED 25
• 100 units at AED 30

So closing inventory is AED 4,250.

FIFO can therefore result in closing inventory that more closely reflects recent purchase costs when prices are changing.

What Is the Weighted Average Inventory Method?

The weighted average method combines the cost of similar inventory items and calculates an average cost per unit.

Using the same example:

• 100 units × AED 20 = AED 2,000
• 100 units × AED 25 = AED 2,500
• 100 units × AED 30 = AED 3,000

Total cost = AED 7,500

Total units = 300

Weighted average cost per unit:

AED 7,500 ÷ 300 = AED 25 per unit

If the company sells 150 units, COGS would be:

150 × AED 25 = AED 3,750

The remaining 150 units would also have a carrying amount of:

150 × AED 25 = AED 3,750

IAS 2 permits the weighted average to be calculated periodically or, depending on the circumstances, as each additional shipment is received.

FIFO vs Weighted Average IFRS: Key Differences

The main difference is how each method assigns costs to inventory sold and inventory remaining.

Factor	FIFO	Weighted Average
Cost assumption	Oldest costs are issued first	Costs are averaged
Closing inventory	Generally reflects newer costs	Reflects average costs
COGS during rising prices	Generally lower	Generally higher than FIFO
Profit during rising prices	Generally higher	Generally lower than FIFO
Price volatility	More sensitive to purchase-cost sequence	Smooths cost fluctuations
Inventory tracking	Can require detailed layer tracking	Generally simpler
Suitable environment	Businesses where cost layers are useful	Businesses with frequent purchases of similar goods

The actual financial effect depends on the company’s purchasing pattern and price movements. Businesses should therefore avoid assuming that one method will always produce a particular result.

How Do FIFO and Weighted Average Affect COGS?

The choice of inventory costing methods under IFRS affects the amount transferred from inventory to cost of goods sold when inventory is sold. When purchase prices are increasing, FIFO generally assigns older, lower costs to COGS. This can produce:

• Lower COGS
• Higher gross profit
• Higher closing inventory

Weighted average, by contrast, spreads the effect of price increases across units. When prices are falling, the relative effect can change.

This is why inventory costing should be considered alongside gross margin analysis. A sudden change in reported gross margin may not necessarily mean selling prices or operating performance have changed; inventory purchase costs and the selected costing formula can also contribute.

Which Method Is Better for UAE Trading Businesses?

There is no universal answer. A UAE trading company should select the method that appropriately reflects its inventory characteristics, accounting policies, systems and reporting requirements.

FIFO May Be Suitable When:

FIFO may be useful when:

• Inventory follows a relatively clear purchase sequence.
• Older stock is normally sold before newer stock.
• Purchase prices change significantly.
• Management wants closing inventory to reflect more recent purchase costs.
• The business can maintain reliable inventory layers.

For businesses dealing with goods that can become obsolete, the physical flow of inventory may also make FIFO operationally intuitive. However, the accounting assumption should not be confused with the actual physical movement of every item.

Weighted Average May Be Suitable When:

Weighted average may be practical when:

• Large quantities of similar goods are purchased regularly.
• Individual purchase batches are difficult to track.
• Prices fluctuate frequently.
• The business wants to smooth short-term cost movements.
• Its accounting or ERP system is designed around average costing.

For distributors and wholesalers handling high volumes of interchangeable products, weighted average can simplify inventory costing and reduce the impact of individual purchase-price fluctuations.

Does Inventory Costing Affect UAE Corporate Tax?

Inventory costing can affect accounting profit because it influences COGS and closing inventory. The FTA explains that UAE Corporate Tax taxable income starts with the business’s accounting net profit or loss, followed by adjustments required under the Corporate Tax Law.

This means accurate inventory accounting is relevant to the financial statements that form the starting point for determining taxable income.

However, businesses should not assume that choosing FIFO or weighted average automatically creates a separate tax deduction or tax advantage. The accounting treatment and applicable UAE Corporate Tax adjustments need to be considered together.

The FTA’s Accounting Standards and Interaction with Corporate Tax guidance explains how accounting standards interact with UAE Corporate Tax requirements.

Businesses should therefore maintain a clear accounting policy and ensure that inventory records support the figures reported in their financial statements.

Inventory Accounting Controls UAE Businesses Should Maintain

Selecting an inventory costing method is only one part of effective inventory accounting. UAE businesses should also establish controls covering:

• Purchase Documentation: Maintain supplier invoices, purchase orders, goods received notes and other records supporting inventory costs.
• Inventory Movements: Record purchases, sales, returns, transfers, damaged goods and stock adjustments accurately.
• Cost Allocation: Ensure that relevant costs included in inventory are appropriately identified and allocated.
• Stock Counts: Perform regular physical inventory counts and reconcile differences with accounting records.
• Obsolete and Slow-Moving Stock: Review whether inventory remains recoverable at its recorded cost. IAS 2 requires inventory to be written down when its cost is not recoverable and requires inventory to be carried at the lower of cost and NRV.
• Consistency: A business should apply its selected cost formula consistently to inventories with a similar nature and use. IAS 2 states that different cost formulas may be justified where inventories have a different nature or use, but geographical location or tax rules alone are not sufficient justification.

How Should a UAE Business Choose Between FIFO and Weighted Average?

Before selecting an inventory costing method, management should consider five questions:

1. Are the inventory items ordinarily interchangeable?
2. How frequently do purchase prices change?
3. Does the physical movement of stock support a particular costing approach?
4. Can the accounting or ERP system calculate the method accurately?
5. Can the business apply the selected policy consistently and document it?

The decision should also be reviewed alongside the company’s financial reporting requirements and inventory management processes.

The objective should not be to select the method that produces the highest profit. Instead, the business should select an appropriate accounting policy, apply it consistently and maintain reliable supporting records.

How Ripple Accountant Can Help UAE Businesses

Ripple Accountant can help businesses establish stronger accounting processes covering inventory records, reconciliations, month-end reporting and financial statement preparation. For businesses, professional accounting support can also help ensure that the selected approach is properly documented, consistently applied and aligned with the company’s reporting requirements.

If your UAE business needs support with inventory accounting, bookkeeping, financial reporting or UAE Corporate Tax compliance, contact Ripple Accountant to discuss your requirements.

• Email: info@uaetaxcompliance.ae 
• Phone: +971 52 356 5409
• WhatsApp: +971 4 250 0833

Frequently Asked Questions

Is FIFO allowed under IFRS?

Yes. IAS 2 permits FIFO for assigning the cost of ordinarily interchangeable inventory. Weighted average is also permitted.

Is weighted average allowed under IFRS?

Yes. IAS 2 permits the weighted average cost formula for ordinarily interchangeable inventory.

Which gives higher profit, FIFO or weighted average?

When inventory purchase prices are rising, FIFO will generally result in lower COGS and therefore higher gross profit than weighted average. The result can differ when prices fall or fluctuate differently.

Does FIFO reduce UAE Corporate Tax?

Not automatically. FIFO can affect accounting COGS and profit, but UAE taxable income is determined from accounting profit after the adjustments required by the Corporate Tax Law.

Can a UAE company use different inventory costing methods?

IAS 2 requires the same cost formula for inventories having a similar nature and use. Different formulas may be justified for inventories with a different nature or use, but differences in geographical location or tax rules alone do not justify different formulas.

Conclusion

The choice between FIFO vs Weighted Average IFRS is an important inventory accounting decision for UAE businesses. IAS 2 permits both methods for ordinarily interchangeable inventory, but each produces a different pattern of COGS and closing inventory when purchase prices change. FIFO generally assigns older costs to goods sold, while weighted average spreads costs across similar inventory. The right choice depends on the nature of the inventory, purchasing patterns, systems, and accounting policy, not simply on which method produces a preferred profit figure.

Disclaimer: This article is provided for general informational purposes only and does not constitute tax, accounting, legal, or professional advice. Regulations and requirements may change, and their application can vary depending on individual business circumstances. Readers should refer to the latest information from the relevant UAE authorities and seek professional advice where appropriate.