FEFO vs FIFO: pick the right stock rotation for dated goods

If you sell anything with a date stamped on it, the way you rotate stock decides how much of it you write off. The two methods that get confused are FEFO and FIFO. They sound interchangeable, and on a good day they behave identically — but the day they diverge is the day good stock expires on your shelf. This guide defines both clearly, shows where they differ in a side-by-side table, and explains when each one is the right call.

FEFO and FIFO, defined

FIFO — First In, First Out rotates stock by arrival order. The oldest-received units ship first. It is the default mental model for almost every warehouse: put new stock behind old stock, pick from the front.

FEFO — First Expired, First Out rotates stock by expiration date. The unit closest to expiring ships first, no matter when it arrived. The pick order follows the date on the box, not the date it landed in your receiving bay.

The crucial word is assumption. FIFO assumes the oldest stock is also the soonest to expire. For undated goods that assumption always holds. For dated goods it often holds — and then occasionally, expensively, it doesn’t.

FEFO vs FIFO: side-by-side

	FIFO (First In, First Out)	FEFO (First Expired, First Out)
Rotates by	Arrival date	Expiration / best-before date
Ships first	Oldest received unit	Soonest-to-expire unit
Needs expiry dates?	No	Yes
Needs batch/lot tracking?	No	Yes
Best for	Undated goods, raw materials	Food, supplements, cosmetics, pharma
Risk if used on dated stock	Short-dated stock left behind → write-offs	— (this is the safe choice)
Per-order lot record	Limited	Each order records the batch it shipped

When FIFO is the right choice

FIFO is not wrong — it is simpler, and for the right inventory it is all you need. Use FIFO when:

• Your products don’t have expiration dates at all (hardware, fasteners, apparel, most raw materials).
• Age matters only for quality drift, not safety, and stock always degrades in arrival order.
• You want the lowest operational overhead — FIFO needs nothing more than disciplined shelving.

For undated stock, layering FEFO on top adds work without adding protection. There’s no date to rotate by, so “first expired” is meaningless.

Why FEFO wins for dated stock

The moment a product carries an expiration, best-before, use-by, or PAO date, FIFO’s core assumption can break. Here’s the classic failure: you have 60 units on the shelf that expire in May. A new delivery arrives — but because of a longer time in the supplier’s warehouse, it expires in March. Under FIFO you’d ship the May stock first (it arrived first) and the March stock sits behind it, quietly counting down to its date. By the time you reach it, it’s expired. That’s a write-off you created by rotating on the wrong field.

FEFO closes the gap. It ignores arrival order and always reaches for the March stock first, because March is sooner. The same logic protects you across every category of perishable and regulated goods — and it’s why food, supplement, cosmetic, and pharmacy stores standardise on it. (For a worked example in regulated goods, see supplement expiry and lot tracking.)

There’s a second payoff beyond waste: a per-order record of what you shipped. Because FEFO is built on batches, each order records exactly which lot it came from — useful when you need to know which customers received a specific batch.

How to run FEFO in WooCommerce

Here’s the catch for store owners: core WooCommerce can’t do FEFO. It tracks one stock number per product, with no expiration dates and no batches, so it has no idea which units expire first. Out of the box, WooCommerce can’t even do strict FIFO on dated stock — it has no date to rotate by.

You add the missing pieces with the Sellinor Product Expiration Dates Pro add-on, which turns each product’s stock into dated batches and rotates them automatically.

Step 1: Track stock as batches, not one number

The free plugin gives every product a single expiration date and can hide it or set it out of stock when that date passes. FEFO needs more granularity, so the Pro add-on lets you record each delivery as a separate batch with three things:

• a quantity,
• an expiration date, and
• an optional batch reference / lot number for your records.

A single SKU can hold several open batches at once — 40 units expiring in March, 60 in May — and the product’s sellable stock is kept in sync with the sum of those batches automatically. Full setup is in batch and lot tracking.

Step 2: Let the plugin deduct the first-expiring lot

This is the FEFO part, and it runs on every order with no manual picking. When an order comes in, the plugin finds the batch with the earliest expiration date that still has stock and deducts from it first, only moving to the next-earliest batch when one is exhausted. You never accidentally ship May’s stock while March’s sits there.

It holds up under real-store messiness:

• The exact batches used are recorded on the order, so you always know what shipped.
• Refunds and cancellations return units to the correct batch instead of inflating a generic stock count.
• If a batch passes its date, it stops counting as sellable stock (unless you deliberately opt to keep selling expired batches — see expiry actions).
• If an order needs more units than your batches can supply, it’s placed on hold with an order note rather than overselling stock you don’t physically have.

Step 3: Pair it with automatic expiry actions

FEFO moves your stock in the right order; expiry actions catch what doesn’t move in time. The free plugin can automatically hide an expired product or set it out of stock — and trigger that a set number of days before the date, giving you a buffer. Combined, the soonest-to-expire stock always sells first, and anything that still reaches its date is pulled from sale before a customer can buy it.

The short version

FIFO rotates by arrival; FEFO rotates by expiry. For undated goods they’re effectively the same and FIFO is simpler. For anything with a date on it, FEFO is the method that actually prevents write-offs — and the only way to run it properly in WooCommerce is with per-batch dates and automatic first-expired deduction. If that’s your inventory, the FEFO setup guide walks through it end to end.