FIFO, LIFO, or Weighted Average Cost (WAC): Which Inventory Valuation Method Should You Choose?
Choosing the right inventory valuation method directly affects cost tracking, profitability analysis, and business decision-making. FIFO, LIFO, and Weighted Average Cost (WAC) are the three most widely known inventory valuation methods, but they are designed for different situations and are not equally suitable for every business.
For SMEs, cooperatives, and small businesses, understanding the differences between these methods helps improve inventory management, ensure accurate financial reporting, and gain a more reliable view of inventory value.
If you want to master the fundamentals of inventory management, also read our guide How to Manage Your Inventory Efficiently in 2026?, where we cover the best practices for improving inventory performance over the long term.
Why Choose an Inventory Valuation Method?
When a business purchases the same product at different prices over time, an important question arises whenever a sale is made: Which purchase cost should be used to calculate the cost of goods sold (COGS) and the value of the remaining inventory?
The answer depends on the inventory valuation method you use.
Your choice impacts:
- Cost of goods sold (COGS)
- Inventory valuation
- Gross profit
- Financial reporting
- Business performance indicators
Selecting a method that matches your business operations—and applying it consistently—is essential for accurate reporting and effective decision-making.
The FIFO Method (First In, First Out)
FIFO (First In, First Out) assumes that the oldest inventory items are sold or consumed first.
This method is particularly suitable for products with expiration dates or limited shelf lives, such as food, cosmetics, pharmaceuticals, and other perishable goods.
Advantages of FIFO
FIFO offers several benefits:
- Better management of expiration dates
- Reduced risk of obsolete inventory
- Ending inventory reflects the most recent purchase prices
- Easy to understand and implement
Because FIFO closely follows the actual physical movement of goods in many industries, it is one of the most commonly used inventory valuation methods worldwide.
The LIFO Method (Last In, First Out)
LIFO (Last In, First Out) assumes that the most recently purchased inventory is sold first.
This method may produce favorable financial results during periods of rising purchase prices because the latest—and typically highest—costs are matched against current sales.
However, LIFO is now rarely used.
It is not permitted under International Financial Reporting Standards (IFRS) and is generally unavailable in most modern inventory management systems.
For most businesses, FIFO or WAC are more appropriate choices.
The Weighted Average Cost (WAC) Method
The Weighted Average Cost (WAC) method calculates an average unit cost after each inventory purchase or over a predefined accounting period.
Every new purchase updates the average cost of the product.
All inventory issues are then valued using this average cost.
Advantages of WAC
The WAC method provides several advantages:
- Smooths out fluctuations in purchase prices
- Simplifies inventory costing
- Provides stable inventory valuation
- Particularly suitable for homogeneous products
WAC is commonly used by manufacturers, wholesalers, distributors, and businesses that manage large quantities of similar products.
Which Method Is Best for Your Business?
The right inventory valuation method depends primarily on your industry and the nature of your products.
A food manufacturer or cosmetics company will generally choose FIFO because products should be sold in the order they are received to minimize waste and ensure product freshness.
A distributor handling standardized products purchased at varying prices may prefer WAC, as it simplifies inventory costing while providing stable financial reporting.
In most situations, LIFO is not recommended due to its accounting limitations and limited international acceptance.
Regardless of the method you choose, consistency is essential to ensure accurate inventory valuation and meaningful financial analysis.
Inventory Management Software Makes Valuation Easier
Calculating inventory costs manually quickly becomes difficult as the number of products increases.
Inventory management software automates inventory valuation based on your selected method.
It updates inventory costs after every purchase, records inventory movements automatically, and provides real-time dashboards for monitoring inventory levels, costs, and profit margins.
This enables managers to make purchasing, sales, and replenishment decisions based on accurate, up-to-date information while reducing manual errors.
Frequently Asked Questions (FAQ)
What is the difference between FIFO and WAC?
FIFO values inventory issues using the oldest inventory costs, while WAC calculates an average purchase cost based on all inventory receipts.
Is LIFO still used?
LIFO is now rarely used internationally because it is not permitted under IFRS. Most businesses choose FIFO or WAC instead.
Which inventory valuation method is best for an SME?
There is no universal answer. FIFO is generally recommended for businesses dealing with perishable products, while WAC is well suited for companies managing homogeneous products or experiencing frequent fluctuations in purchase prices.
Are you looking for an ERP solution for your business? Choose Logistiqa for simple, efficient inventory management and transform your operations into a true competitive advantage. Request a free demo today.
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