The importance of First In, First Out (FIFO) in supply chains

Why FIFO still matters in modern supply chains

In today’s supply chains, where volatility is standard and inventory management teams constantly face pressure to cut costs, inventory rotation plays a strategic role. Organisations encounter preventable losses from obsolete, expired, or forgotten stock stored at the back of the warehouse. 

That’s where FIFO comes in.

First In, First Out (FIFO) is a widely used method of inventory rotation and offers a straightforward and dependable way to protect stock quality, maintain accuracy, and prevent costly write-offs.

When well executed, it optimises warehouse space, improves service levels, enhances cash flow, reduces holding costs, and supports a resilient supply chain, especially for perishable items. It establishes a foundation for effective inventory management, lean operations, less waste and spoilage, and better service levels.

What is FIFO, and why is it so effective?

FIFO involves consistently using or shipping the oldest stock first. It ensures you cycle through stock in the order it arrived at the warehouse, reducing waste, maintaining product freshness, and prioritising safety and accuracy.

FIFO is especially valuable for:

• products with expiry dates
• regulated items
• high-volume or fast-turnover goods
• SKUs prone to obsolescence or packaging changes.

Operationally, it requires warehouse teams to pick older stock first and store new deliveries behind or above existing stock to ensure proper rotation. FIFO maintains high-quality product flow by aligning stock rotation with expiration dates and enhances efficiency when using automated systems, such as a WMS or ERP, to flag ageing stock and easily guide teams to the right locations.

FIFO helps minimise the waste of perishable items and calculate the Cost of Goods Sold (COGS) in accounting.

Why do supply chain teams prioritise FIFO?

There are many benefits to prioritising FIFO:

It reduces shrinkage, spoilage, obsolescence and write-offs

Effective rotation prevents spoilage, ageing, and product degradation – one of the most costly supply-chain errors. This is especially important for date-sensitive, regulatory, or quality-critical products. The longer items remain in the warehouse, the greater the risk of damage, packaging deterioration, and customer dissatisfaction. FIFO ensures goods are moved efficiently to prevent these problems from arising. 

It enhances inventory accuracy and traceability

FIFO streamlines lot tracking, auditing, and recall processes. By keeping inventory flows clear and chronological, organisations improve visibility, leading to quicker, more precise decision-making.

It stabilises financial and operational performance

Dead stock ties up space, cash, and labour. FIFO minimises the hidden costs of holding dead or slow-moving stock. It stabilises the cost of goods sold (COGS), aligns physical flows with accounting, and supports more accurate demand planning. 

FIFO is among the simplest methods to sustain a healthy balance between working capital and customer service.

It enhances customer experience

FIFO helps deliver reliability at scale. When customers receive products in top condition and not near end-of-life, there is an immediate positive effect. There will be fewer returns and quality complaints, with more consistent service levels.  

What industries are best for FIFO?

FIFO is advantageous across all industries, but it has the greatest influence in sectors with high-turnover items, large-volume distribution, multi-mode supply networks, and those that are regulated or safety-critical.

FMCG, grocery, pharmaceuticals, and daily-pick environments are well-suited because even small lapses in rotation can have significant financial or regulatory consequences.

How to implement FIFO effectively

A successful FIFO policy relies on consistency and visibility throughout the entire warehouse and supply chain. Proper implementation and diligent management of FIFO will support efficient warehouse operations, saving time and money while improving profitability and service levels.

Here are some key steps:

• Identify the items in your product range that require rotation. Not all items need FIFO, so you can prioritise those that are perishable, regulated, or have lot or expiry dates. 
• Design the warehouse for FIFO. Implement FIFO-compatible storage solutions, such as pallet flow racking and gravity lanes. Clearly mark zones and plan optimised travel routes. The aim is to make the oldest stock easiest to pick and minimise errors.
• Use systems to drive compliance. A WMS or ERP can automate pick sequencing, guide operators to the right locations, prevent non-FIFO picks and flag ageing inventory.
• Label and track stock accurately. Implement barcode or RFID tracking to enable real-time visibility of ageing stock, providing clarity and reducing errors.
• Train teams thoroughly. Ensure warehouse teams understand how to rotate stock, unpack deliveries, and handle exceptions.  
• Collaborate with suppliers. Establish rotation protocols with suppliers, distribution centres, and retail outlets to prevent ageing stock throughout the supply chain. Ensure products are correctly labelled, including clear manufacturing or expiry dates, to facilitate efficient receiving and unpacking. 
• Monitor and measure. Track KPIs such as inventory turnover rate, dwell time, ageing stock, and the percentage of FIFO-compliant shipments to assess success.

FIFO challenges and considerations

While FIFO is simple in principle, there are several limitations:

• Higher taxable income from reporting increased profits during periods of inflation. During inflation, older stock is assigned to COGS.
• Unsuitable for items with volatile prices, as it can lead to recording different costs for the same items within the same period.
• More data-intensive than other methods, like LIFO, which can cause accounting errors.
• Oversimplified valuations can distort costs due to inflation, supply and demand fluctuations, and foreign exchange movements.

Is FIFO better than LIFO?

Last In, First Out (LIFO) means that you cycle through new stock before older stock. Since the most recently purchased items are dispatched first, this can lead to outdated items, expired goods, hidden shrinkage, and inaccurate stock valuations.

The main advantage of using LIFO stock rotation is that the cost of goods sold (COGS) is calculated based on the most recent inventory costs, while older inventory costs stay in the closing inventory balance.

However, LIFO might not accurately reflect the true cost of remaining inventory, particularly during inflationary periods. Since it is more complex than FIFO, it could lead to extra record-keeping.

LIFO is not allowed in the UK, as it can misrepresent or artificially lower profitability and financial statements.

With FIFO, your oldest inventory costs are assigned to COGS. The remaining inventory at the end of the accounting period consists of your most recently purchased or produced items. This method offers a more accurate way to calculate your ending inventory value. By using the oldest inventory first, the price or value of each stock item (SKU) is considered the most precise estimate.

FIFO is advantageous during rising inflation because the most recent inventory is likely to have a higher cost than older stock.

Other stock rotation methods

There are different stock rotation methods that can be used instead of or alongside FIFO. These include:

• FEFO First Expired, First Out – FEFO prioritises items based on expiry date rather than the date they arrive in the warehouse, which is more important for food and medicines.
• HIFO Highest In, First Out – HIFO prioritises the most expensive items.
• LOFO Lowest In, First Out – LOFO prioritises the cheapest items.

Although many options are available for accounting and stock rotation, it is essential to choose the most suitable one for your product profiles, industry, and business objectives.

FIFO as a strategic advantage

FIFO is more than just a stock rotation method. It protects profitability, compliance, operational flow, and customer satisfaction. When implemented effectively, it:

• Reduces avoidable losses
• Improves stock management accuracy
• Strengthens financial stability
• Protects product quality
• Drives operational efficiency.

In a purchasing environment where every margin counts, FIFO is among the most dependable methods to maintain a lean, efficient, and resilient supply chain.