FIFO: Why It Matters—and How MES Helps Manufacturers Get It Right

TL;DR

FIFO (First In, First Out) remains an important inventory management practice, but maintaining it has become increasingly difficult as manufacturing operations grow more complex. MES platforms like TrakSYS help enforce FIFO at the point of execution by validating material usage, improving visibility, and ensuring traceability throughout production.

Key takeaways:

• FIFO helps reduce waste, improve inventory rotation, and support traceability by prioritizing the use of older inventory.
• Modern manufacturing complicates FIFO by introducing quality holds, expiration dates, material reservations, and changing production schedules.
• Disconnected systems and manual processes often undermine FIFO compliance, leading to spoilage, delays, and inventory inaccuracies.
• MES platforms like TrakSYS validate materials in real-time, guiding operators to eligible lots and enforcing business rules during production.
• Strong FIFO execution improves inventory accuracy, traceability, operational visibility, and overall manufacturing performance.

Ready to optimize material management? Contact us today.

First In, First Out

Age of materials matters.

When manufacturing products like pharmaceuticals, foods & beverages, cosmetics & personal care, and some consumer packaged goods, such as cleaning supplies, the shelf life of ingredients greatly impacts the quality and compliance of the final product.

The simplest, and often most obvious, way to organize such inventory is FIFO—or First in, First out—meaning use the oldest materials first, and replenish from the back so older products get used first, minimizing spoilage.

However. FIFO is a concept that is straightforward in theory but becomes exponentially more difficult in the wake of production complexities.

Production flow is often interrupted by schedule changes, multiple storage locations, and urgent orders. And when it comes to materials, some have shelf-life limits, some have quality releases, and others are split across partial lots. With all these factors at play, what was once a straightforward inventory plan quickly becomes an ever-changing daily challenge.

When FIFO breaks down, the consequences can be costly: expired materials, increased waste, excess carrying costs, production delays, and compromised quality. These risks are why FIFO remains an important topic in modern manufacturing—and why Manufacturing Execution Systems (MES) are increasingly pivotal for successful materials management.

FIFO: A Practical Rule Born in the Warehouse

FIFO is not new. Long before digital systems existed, warehouses and storerooms have always needed to rotate stock and prevent older materials from expiring or being forgotten.

In early industrial operations, inventory was managed manually using paper receiving logs, shelf tags, bin cards, and human memory. When older materials got buried behind newer deliveries, waste was inevitable. FIFO emerged as a practical approach to mitigating material loss—a way to simply ensure that older stock moved first.

Throughout the 20th century, as more foods, pharmaceuticals, and packaged goods were manufactured and distributed in bulk, FIFO became even more important. Organizations began to carry more inventory and source from multiple suppliers, all while warehouses grew larger and more structured, introducing pallet racking, forklifts, formal receiving processes, and more. FIFO addressed growing concerns to:

• Reduce spoilage
• Improve inventory rotation
• Simplify stock handling
• Support cleaner accounting valuation
• Improve service levels and availability

FIFO was a strong system for its time—and it still is. However. Today’s advanced manufacturing environments are far more dynamic than stockrooms past.

What FIFO Looks Like Today

Many define FIFO as simply “oldest inventory gets used first.” While directionally true, modern operations are more nuanced than that. FIFO decisions depend on:

• Manufacturing date
• Quality release status
• Storage conditions
• Customer commitments
• Lot creation date
• Material reservations
• Regulatory restrictions
• Expiration date

Once all these factors are considered, they may mean that the oldest pallet in the warehouse isn’t the next pallet that should be consumed. For example, a newer lot may be quality released while an older lot is still on hold; a reserved lot may be unavailable for general use; or certain customers may require specific lot segregation.

In short, FIFO is not just a shelving strategy; it’s a decision-making process that must balance inventory age, quality, compliance, and production needs.

FIFO is Harder to Maintain Than Ever

While FIFO is a simple concept, most challenges arise because operational complexity creates opportunities for inventory discipline to break down.

For example, during a batch run, an ERP may indicate that Lot A104 should be consumed first. However, if that lot has been staged in another area, partially consumed, or placed on hold, operators may select Lot A107 simply because it is available nearby. Without real-time visibility into inventory location, status, and eligibility, FIFO decisions become increasingly dependent on manual judgment.

MES + FIFO: Working Together Towards Real Operational Value

FIFO challenges rarely originate in planning systems; they emerge during execution. This is where a modern MES platform like TrakSYS brings value.

While ERP systems manage purchasing, inventory balances, and transaction planning, MES operates alongside production execution. It captures material consumption as it occurs and validates decisions at point of use.

For example, when an operator scans a lot before beginning a batch, TrakSYS evaluates:

• Whether the material is approved for use
• If an older eligible lot exists
• Any active orders assigned to the lot
• Quality and traceability requirements

If the scanned material violates any configured rules, the system can generate warnings, require approval, or prevent execution altogether.

TrakSYS can also guide FIFO consumption directly within production workflows. During batch execution, the system can present the next eligible lot based on configured business rules, inventory status, expiration dates, and production requirements.

And because MES records material consumption in real-time, inventory accuracy improves automatically. Every transaction becomes linked to:

• Production order
• Batch record
• Asset
• Operator
• Timestamp

This creates a complete genealogy record while maintaining alignment between inventory logs and production reality.

The value of combining MES capabilities with FIFO methodology is evident across all sectors of manufacturing. Different industries encounter different FIFO challenges, but the underlying requirement remains consistent: accurate material rotation supported by real-time execution data.

The Business Value of Better FIFO Execution

Improving FIFO performance can lead to benefits across the organization.

Inventory waste declines as aging materials are consumed before expiration, and dormant stock is identified and used more effectively. Production teams spend less time searching for eligible materials, reducing delays at batch start-up and changeover.

At the same time, traceability becomes stronger. Digital records link material movements, production orders, and finished goods, simplifying audits, investigations, and recall activities.

And, perhaps most importantly, improved FIFO execution creates better operational visibility. Manufacturers gain insight into recurring overrides, aging inventory trends, material bottlenecks, and opportunities for process improvement.

Conclusion

FIFO began as a practical warehouse discipline, but alongside modern manufacturing, it has evolved into a broader execution challenge. Maintaining FIFO requires visibility into material status, location, eligibility, and consumption when and where production decisions are made.

Dynamic MES platforms like TrakSYS help close the gap between inventory records and production reality by validating materials, guiding consumption workflows, capturing genealogy, and enforcing business rules directly within execution processes. The result is stronger inventory control, reduced waste, improved traceability, and more consistent operational performance.

Ready to optimize material management? Contact us today.