What is FIFO in Inventory Management and Why Does It Matter?
FIFO — First In, First Out — is one of the most important principles in inventory management. It sounds simple, but without a system to enforce it, most businesses quietly break the rule every single day.
What is FIFO? The Core Definition
FIFO stands for First In, First Out. In inventory management, it means that the stock which entered your warehouse first should be the stock that leaves first — whether that means being sold to a customer, used in production, or dispatched to another location.
Think of it like a queue at a railway ticket counter. The person who arrived first gets served first. In your warehouse, the product that arrived first gets picked and dispatched first.
This principle applies universally — to finished goods in a retail store, raw materials in a factory, medicines in a pharmacy, and food products in a distribution centre. The logic is always the same: older stock out first.
Why FIFO Matters — The Real Cost of Ignoring It
FIFO is not just an accounting convention. Ignoring it creates real, measurable losses in your business. Here is what happens when stock is not rotated on a FIFO basis:
1. Products expire or become obsolete
When newer stock keeps getting picked first — because it is placed at the front of a shelf or is simply more accessible — older stock keeps getting pushed back. In food, pharma, and chemical businesses, this directly leads to expired products that must be written off. Even in non-perishable goods like electronics or fashion, older batches can become obsolete or unsaleable.
2. Quality problems reach customers
A batch of goods that has been sitting in a warehouse for six months may have deteriorated in packaging, coating, or material quality — even if it has not technically expired. When it eventually gets dispatched, the customer receives lower-quality goods from an older batch, increasing returns and complaints.
3. Working capital gets locked up
Old stock that keeps getting bypassed represents money that is not moving. Every day an old batch sits while newer stock turns over, your working capital efficiency drops. Businesses often discover, during a physical count or audit, that they have been carrying months-old stock that could have been cleared long ago.
4. Accounting and costing errors
Under Indian Accounting Standards (Ind AS 2), inventory must generally be valued using the FIFO or weighted average cost method. If actual stock rotation does not match the accounting method, your cost of goods sold (COGS) calculations will be inaccurate — leading to misstated profits and incorrect tax filings.
How FIFO Works in Practice — Step by Step
Understanding FIFO as a concept is easy. Implementing it consistently across a warehouse with hundreds of SKUs and dozens of staff members is where businesses struggle. Here is how the process is supposed to work:
- Goods arrive (GRN). A new batch of items arrives at the warehouse. Each batch is assigned a receipt date or batch number at the time of Goods Receipt Note (GRN).
- Items are stored. New stock should be stored behind existing stock of the same item — so that existing stock is physically closer to the picking zone. This is the physical enforcement of FIFO.
- Pick list is generated. When a sales order comes in, a pick list is generated that specifies which batch to pick. Under FIFO, the system always points to the oldest batch first.
- Picker collects the correct batch. The picker goes to the specified location, picks the oldest batch, and confirms the pick by scanning the barcode on the item.
- Stock is dispatched. The older batch leaves the warehouse. The system updates stock levels for that batch. The next pick for the same item will again point to the oldest remaining batch.
See FIFO in Action — Interactive Demo
Use the buttons below to simulate how FIFO dispatches stock. Each "Dispatch" always sends out the oldest batch first. "Receive Stock" adds a fresh batch to the end of the queue.
FIFO vs LIFO — What is the Difference?
LIFO stands for Last In, First Out — the opposite of FIFO. Under LIFO, the most recently received stock is dispatched first. While LIFO has some accounting applications in certain countries, it is not permitted under Indian Accounting Standards (Ind AS 2) for inventory valuation.
Here is a side-by-side comparison:
| Criteria | FIFO | LIFO |
|---|---|---|
| What is dispatched first? | Oldest batch / earliest received | Newest batch / latest received |
| Risk of expiry / obsolescence | Low — old stock moves first | High — old stock may never move |
| Allowed under Ind AS 2 (India) | Yes — standard method | No — not permitted |
| Suitable for perishable goods | Yes — essential | No — causes spoilage |
| Inventory valuation accuracy | High — reflects current costs | Lower in inflationary markets |
| Warehousing effort | Moderate — requires proper storage layout | Low — just grab what is in front |
| Customer satisfaction | High — customers get fresh stock | Risk — customers may receive old stock |
Which Industries Need FIFO Most?
While FIFO is good practice for every business that handles physical stock, it is non-negotiable in certain industries:
Pharmaceuticals
Medicines have strict expiry dates. Dispensing an expired or near-expired medicine is a serious health, legal, and regulatory risk. CDSCO (India's drug regulator) and Schedule M GMP guidelines both require proper batch rotation. FIFO is not optional in pharma — it is a compliance requirement.
Food and Beverages
FSSAI regulations require food businesses to ensure proper stock rotation to prevent expired goods from reaching consumers. A food distributor or cold chain operator that doesn't enforce FIFO faces both product loss and potential regulatory action.
Chemicals and Paints
Many chemicals have shelf lives, stability windows, and may degrade or separate if stored too long. FIFO ensures that older batches are used before they become unusable or unsafe.
Retail and FMCG
Retailers and FMCG distributors carrying hundreds of fast-moving SKUs with varying expiry dates depend on FIFO to prevent shelf wastage and customer complaints.
Manufacturing (Raw Materials)
Even raw materials that don't technically "expire" can degrade in quality — rubber hardens, solvents evaporate, metals oxidise. Manufacturing units should also follow FIFO for raw material consumption to ensure consistent product quality and accurate cost tracking.
How Inventory Management Software Enforces FIFO Automatically
The challenge with FIFO is not understanding it — everyone agrees they should do it. The challenge is consistently enforcing it across a warehouse with many SKUs, multiple staff members, and stock spread across different shelves and bins.
This is where Inventory Management Software (IMS) changes everything. It enforces FIFO automatically, without relying on memory or discipline.
Step 1 — Batch recording at GRN
When goods are received, the IMS records the batch number, receipt date, manufacture date, and expiry date at the time of GRN. Every unit in that batch is tagged with this information in the system.
Step 2 — Automated FIFO pick sequencing
When a sales order is raised and a pick list is generated, the IMS automatically identifies which batch of the required item has the earliest receipt date or nearest expiry date — and directs the picker to that batch first. The picker does not need to check dates manually. The system has already decided.
Step 3 — Barcode verification prevents errors
When the picker reaches the shelf and scans the item's barcode, the IMS confirms whether it is the correct batch. If the picker accidentally scans a newer batch, the system raises an alert immediately — before the wrong item reaches the packing station.
Step 4 — Expiry visibility reports
At any time, the IMS can generate a report showing all items expiring within the next 30, 60, or 90 days. This gives you visibility to proactively clear near-expiry stock — through promotions, transfers to faster-moving locations, or returns to suppliers.
Benefits of Implementing FIFO with IMS
✅ What You Gain When IMS Enforces FIFO
Common FIFO Mistakes — and How IMS Fixes Each One
| Common Mistake | What Goes Wrong | How IMS Fixes It |
|---|---|---|
| New stock placed in front | Pickers grab newest items, old stock keeps aging | System directs pickers by batch date regardless of shelf position |
| Batch dates not recorded at GRN | No way to know which batch is oldest | Mandatory batch/date fields during GRN entry |
| Manual pick lists without batch info | Pickers choose whichever batch is convenient | System-generated pick lists always specify the correct batch |
| No expiry monitoring | Expired stock discovered only during physical count | Automated expiry alerts 30/60/90 days in advance |
| Multiple batches mixed in one bin | Impossible to tell which unit belongs to which batch | IMS assigns separate bin locations per batch; scanning confirms |
How to Implement FIFO in Your Business — Starting Today
Implementing FIFO does not require a complete warehouse overhaul. Here is a practical, phased approach that works for businesses of any size:
- Start recording batch numbers and dates during GRN. If you are not already doing this, start immediately. Every delivery that arrives needs a date stamp in your system. This is the foundation of FIFO.
- Organise your shelves physically. New stock goes at the back. Old stock stays at the front. Label your shelves or bins clearly with the batch date.
- Switch from paper pick lists to system-generated ones. Paper lists cannot enforce FIFO. System-generated pick lists from your IMS can — and should specify the batch number for every item.
- Enable barcode scanning at picking. This is the enforcement layer. If a picker scans the wrong batch, the system flags it before dispatch.
- Set up expiry alerts. Configure your IMS to notify you 60 and 30 days before expiry for all items with shelf lives. This gives you time to act.
Frequently Asked Questions