FIFO, LIFO & FEFO

Definition

FIFO means First-In, First-Out. Under a FIFO operating rule, the material received earlier is normally selected for issue before material received later, subject to the item's condition, status and applicable operational requirements.

LIFO means Last-In, First-Out. Under a LIFO sequence, the most recently received material is selected first. LIFO is generally a specific operating choice and should only be used where it is operationally suitable and consistent with the organization's inventory policy.

FEFO means First-Expired, First-Out. The material with the earliest expiry or use-by date is selected first, irrespective of which batch was physically received first.

Core principle: Use the rotation method that best protects material usability, quality, traceability, safety and operational continuity. FIFO is not a substitute for FEFO when expiry dates govern material usability.

Why Inventory Rotation Matters

Reduce avoidable material ageing.
Protect shelf-life-sensitive materials.
Reduce deterioration and obsolescence.
Maintain batch and lot traceability.
Prevent newer stock from being consumed while older stock remains.
Improve inventory availability and usability.
Support accurate ageing analysis.
Improve Stores housekeeping and stock visibility.
Support quality and regulatory requirements where applicable.
Reduce inventory write-offs caused by poor rotation.

FIFO — First-In, First-Out

FIFO prioritizes the material that entered inventory first. The receipt date, batch date or other defined ageing attribute is therefore important for determining issue sequence.

Oldest Eligible Receipt → First Issue

Example

Batch	Receipt Date	Quantity
A	05-Jan	100
B	18-Jan	100
C	02-Feb	100

If 120 units are required under FIFO, the normal sequence is: 100 units from Batch A + 20 units from Batch B, provided all batches are eligible for issue.

FEFO — First-Expired, First-Out

FEFO prioritizes the batch with the earliest expiry or use-by date. Receipt date is secondary when expiry dates differ.

Batch	Receipt Date	Expiry Date	Quantity
A	01-Jan	30-Jun	100
B	20-Jan	31-May	100
C	10-Feb	31-Aug	100

Under FEFO, Batch B is selected before Batch A because its expiry date is earlier, even though Batch A was received first.

FEFO rule: For expiry-controlled materials, the earliest eligible expiry date normally determines issue priority rather than simple receipt sequence.

LIFO — Last-In, First-Out

LIFO selects the most recently received eligible material first. It may be operationally useful in specific physical-storage situations, but it should not be applied automatically to all materials.

For example, certain bulk storage arrangements may naturally make the most recently placed material the easiest to retrieve. However, the operational convenience must be evaluated against ageing, deterioration, shelf-life, traceability and material characteristics.

Newest Eligible Receipt → First Issue

FIFO vs LIFO vs FEFO

Method	Primary Selection Basis	Main Purpose	Typical Consideration
FIFO	Oldest receipt / stock age	Control ageing	General inventory rotation
LIFO	Newest receipt	Specific operational sequence	Use only where appropriate
FEFO	Earliest expiry	Protect shelf life	Expiry-controlled materials

Decision Logic

Is expiry controlled? → YES → FEFO → NO → Is ageing relevant? → YES → FIFO → NO → Use the approved operating sequence

This is a practical control logic rather than an absolute rule. Material quality status, quarantine status, batch restrictions, technical compatibility and user requirements can override normal rotation where authorized.

Eligibility Before Rotation

A material should not be selected merely because it is the oldest or earliest-expiring stock. It must first be eligible for issue.

Check	Question
Quality Status	Is the material released for use?
Expiry	Has the expiry or use-by date passed?
Batch	Is the batch approved for the intended use?
Specification	Does the material meet the required specification?
Condition	Is the physical condition acceptable?
Reservation	Is the stock already reserved for another requirement?
Traceability	Can the batch or lot be properly identified?

FIFO Operating Process

Record the receipt date and batch or lot where applicable.
Store material so older stock remains identifiable and accessible.
Maintain clear labels and location records.
Arrange stock so the oldest eligible material can be picked first.
Verify item identity and status before issue.
Issue according to the approved FIFO sequence.
Record the transaction in ERP or the authorized stock system.
Monitor ageing and remaining old stock.

Receive → Date/Batch Identify → Arrange → Select Oldest Eligible Stock → Issue → Record

FEFO Operating Process

Capture expiry or use-by date at receipt.
Maintain batch or lot identification.
Store batches so expiry information remains visible.
Arrange or system-sort batches by expiry date.
Check the earliest expiry before issue.
Issue the earliest eligible batch.
Monitor approaching expiry continuously.
Escalate stock approaching expiry according to policy.

Receive → Capture Expiry → Batch Control → Sort by Expiry → Issue Earliest Eligible Batch

Shelf-Life Management

Shelf-life management is closely connected with FEFO. A material may remain physically present but become unusable when its remaining shelf life falls below the required operational limit.

Remaining Shelf Life = Expiry Date − Current Date

Organizations may establish minimum acceptable remaining shelf life at receipt and issue according to material characteristics, supplier conditions, technical requirements and applicable policy.

Expiry Risk Classification

Status	Typical Action
Normal	Continue normal storage and rotation
Approaching Expiry	Prioritize consumption and notify responsible function
Near Expiry	Immediate review and controlled consumption plan
Expired	Block from normal issue pending authorized disposition

Batch and Lot Control

FIFO and FEFO become significantly stronger when batch or lot identity is maintained throughout the material lifecycle.

A batch record may contain:

Item code
Batch / lot number
Supplier
Receipt date
Manufacturing date where applicable
Expiry date where applicable
Quantity received
Quantity issued
Balance quantity
Storage location
Quality status
Relevant inspection information

Physical Storage Arrangement

The physical arrangement should make the intended issue sequence obvious to Stores personnel. Labels, rack positions, batch separation and access paths should support the selected rotation method.

Method	Physical Arrangement
FIFO	Older stock positioned for earlier retrieval
FEFO	Earliest expiry positioned or electronically prioritized for issue
LIFO	Newest eligible stock deliberately made first-access stock where approved

When FIFO Should Not Be Blindly Applied

The older batch has failed inspection.
The older material has expired.
The older material is reserved for another application.
The older batch has a technical restriction.
The newer batch has been specifically authorized for the requirement.
Physical condition makes the older stock unsuitable.
Batch traceability requires a specific lot.

Any departure from the normal rotation rule should be controlled and, where required, documented.

When FEFO Should Take Priority

Lubricants with defined shelf life.
Chemicals and treatment materials.
Adhesives and sealants.
Rubber products with ageing limitations.
Paints and coatings.
Food, pharmaceutical or laboratory materials where applicable.
Battery-related materials where shelf life applies.
Any material with an explicit expiry or use-by date.

Industrial MRO Application

FIFO is highly useful for consumables and materials where ageing can affect usability. However, not every MRO spare requires strict FIFO. For example, a durable mechanical component stored under suitable conditions may not have the same ageing risk as a chemical or rubber component.

The appropriate rotation rule should therefore consider the material's technical characteristics rather than applying one universal method to all SKUs.

FIFO / FEFO and Inventory Ageing

Ageing analysis identifies how long stock has remained without being consumed or moved. Rotation controls are one of the operational mechanisms used to prevent avoidable ageing.

Ageing Days = Current Date − Relevant Receipt Date

For expiry-controlled stock, expiry proximity may be more important than age since receipt.

Expiry Risk Days = Expiry Date − Current Date

ERP Controls

An ERP system can support FIFO and FEFO through receipt dates, batch records, expiry dates, stock status, storage locations and issue transactions. The exact functionality depends on the ERP configuration.

ERP Field	Control Purpose
Receipt Date	FIFO sequence
Batch / Lot	Traceability
Expiry Date	FEFO sequence
Storage Location	Physical retrieval
Stock Status	Eligibility for issue
Quantity	Available balance
Movement History	Transaction traceability

ERP Transaction Discipline

Record receipts promptly.
Maintain correct batch information.
Record expiry information where applicable.
Use the correct storage location.
Do not bypass status controls.
Record issues against the correct batch where required.
Investigate negative or unexplained balances.
Reconcile physical and system stock regularly.

FIFO / FEFO Exception Management

Exception	Possible Cause	Action
Old stock remains	Newer stock issued first	Investigate rotation failure
Expired stock found	Poor FEFO or expiry monitoring	Block and investigate
Wrong batch issued	Identification or transaction error	Trace and correct
Unidentified batch	Label or master-data failure	Quarantine until identified
Stock inaccessible	Poor physical arrangement	Reorganize location

Decision Matrix

Material Characteristic	Preferred Consideration
Expiry-controlled	FEFO
Age-sensitive but no expiry date	FIFO
Stable durable spare	FIFO or approved operational sequence
Bulk material with special handling	Defined physical operating rule
Batch-specific requirement	Specified batch selection
Quality-restricted stock	Issue only after release

Key Controls

Receipt-date recording.
Batch and lot identification.
Expiry-date recording.
Clear physical labels.
Location discipline.
Rotation sequence.
Ageing reports.
Expiry alerts.
Periodic physical verification.
Authorized exception handling.

Key KPIs

Old Stock Consumption

Percentage of eligible old stock consumed according to the defined rotation rule.

Expired Stock Value

Inventory value identified as expired or unusable due to shelf-life failure.

Expiry Risk

Quantity or value approaching the defined expiry-risk threshold.

Rotation Compliance

Percentage of sampled issues following the required FIFO or FEFO sequence.

Ageing Inventory

Value or quantity remaining beyond defined ageing thresholds.

Batch Accuracy

Agreement between physical batch information and system records.

Common Errors

Using FIFO where FEFO is required.
Ignoring expiry dates.
Mixing batches without adequate identification.
Removing labels during handling.
Storing new stock in front of old stock.
Failing to monitor approaching expiry.
Issuing stock without checking batch status.
Allowing manual overrides without authorization.
Maintaining incorrect receipt dates in ERP.
Failing to investigate old stock remaining behind newer stock.

Excel / MIS Application

A practical FIFO/FEFO control sheet can contain:

For FIFO analysis, records can be sorted by item and receipt date. For FEFO analysis, records can be sorted by item and expiry date. Additional filters can identify batches approaching expiry or exceeding defined ageing limits.

Practical Control Example

Batch	Receipt	Expiry	Qty	FIFO Priority	FEFO Priority
A	01-Jan	30-Sep	100	1	2
B	15-Jan	31-Jul	100	2	1
C	01-Feb	31-Dec	100	3	3

FIFO selects A first because A was received first. FEFO selects B first because B expires first. This illustrates why receipt sequence and expiry sequence can produce different issue priorities.

Professional Control Framework

Identify → Date → Batch → Locate → Rotate → Issue → Record → Monitor → Reconcile → Improve

The physical Stores system, ERP records and management reports should all support the same rotation rule. A rotation policy is effective only when material identification, location management, transaction discipline and physical handling work together.

Professional practice: FIFO, LIFO and FEFO are inventory-rotation methods, not interchangeable labels. The appropriate method should be selected according to material characteristics, shelf life, quality status, traceability requirements, physical storage design and organizational policy.