FIFO vs LIFO Inventory Management for E-Commerce

FIFO and LIFO, in plain terms

FIFO (First-In, First-Out) means the oldest units in your inventory get picked, packed, and shipped before newer units. LIFO (Last-In, First-Out) means the newest units go out first, and the older stock sits behind them. Those two sentences answer most of what people searching this term actually want to know.

The confusing part is that FIFO and LIFO are really two separate ideas sharing the same name. One is a physical warehouse practice — the order stock physically leaves the building. The other is an accounting method for reporting cost of goods sold (COGS) and inventory value on your books. A brand can rotate stock physically with FIFO while its accountant uses LIFO for tax purposes. They don't have to match, and for most e-commerce sellers, they shouldn't be confused with each other.

We run a warehouse, not an accounting firm — this isn't tax advice, and which method you elect for your books is a conversation with your CPA. What follows is how the physical side works, and what it costs.

Why FIFO is the physical warehouse standard

Because inventory that sits gets old, and old inventory costs you money in ways that don't show up until it's too late. Packaging fades and gets dented. Formulations expire. Trend-driven SKUs go stale before they sell. On top of that, marketplaces have their own rules — Amazon, for instance, can flag and remove aged FBA inventory that trips its freshness or performance thresholds. FIFO is the practice that prevents all of that: newest stock waits its turn, oldest stock ships first.

LIFO almost never gets used for physical fulfillment, for an obvious reason — if you keep shipping your newest units and never touch the older pallets, the older pallets rot in the back of the warehouse. That's tolerable for a narrow set of non-perishable bulk commodities. It's a bad plan for skincare, supplements, food, apparel, electronics, or anything with a shelf life, a season, or a version number.

This matters even when your product technically doesn't expire. Packaging redesigns, formula updates, and seasonal SKUs create the same problem perishables create under LIFO: stock that never rotates out eventually becomes dead stock you write off. FIFO is what stops that from happening quietly, month after month, until you notice it on a shelf count.

How we run FIFO rotation in our Houston warehouse

Every pallet and case gets dated on the way in, then picked oldest-first by default. You don't have to ask us to do it, and you don't pay extra for it.

1. Receiving: inbound pallets and cartons are logged with receipt date, and lot number or expiration date when the product carries one.
2. Putaway: stock is shelved so older lots sit in the active pick path and newer lots sit behind them, not stacked randomly by whoever unloaded the truck.
3. Pick and pack: our real-time inventory dashboard (KAK WMS) directs pickers to the oldest eligible lot for every FBA prep job and every FBM order, so nothing new ships ahead of something old.
4. Visibility: you can see lot age and expiration data on your dashboard any time — we don't make you email us to find out what's about to go stale.

What FIFO-friendly fulfillment actually costs

Rotation doesn't cost extra. It's built into the same flat rates we charge for prep, order fulfillment, and storage. Here's what's on the price list:

No minimums, no setup fees, no contracts — you can start with a single unit and leave whenever you want. See the full breakdown on our pricing page or the price list.

What a month actually costs, worked out

Take a supplement brand storing 20 pallets, sending 300 units into FBA prep, and shipping 150 direct-to-consumer orders a month, all under 5 lb.

That's the whole bill. FIFO rotation, lot tracking, and dashboard visibility are already inside those numbers — none of them show up as a separate line item.; otherwise it's $20/pallet ($5/carton). Run your own numbers through our quote form and you'll have a line-item answer in 24 hours.

Questions brands ask before switching 3PLs

Most of the people who email us about FIFO and LIFO are really asking a narrower question: will this warehouse actually rotate my stock, or will I find six-month-old units sitting behind the new ones on a cycle count? Here's what we can answer directly.

• Do you track lot numbers and expiration dates? Yes, on request — tell us what to track when you onboard.
• Is FIFO automatic, or something I have to request? Automatic. It's how the warehouse runs by default on every account.
• What if my product doesn't have an expiration date? We still rotate by receipt date, so packaging refreshes and version changes don't get stranded behind older stock.
• Are there minimums, setup fees, or contracts? No minimums, no setup fees, no contracts — month-to-month, and you can start with a single unit.
• Can I change my accounting method without changing 3PLs? Yes. Physical rotation and accounting election are separate decisions. We rotate stock physically; how you report COGS is between you and your CPA.

LIFO can still make sense purely as a tax-accounting election during periods of rising costs — that's a legitimate reason some US businesses choose it, separate from anything happening on a warehouse floor. If you're evaluating LIFO for your books, that's a question for your accountant. If you're evaluating whether your 3PL actually rotates stock the way it claims to, that's what this page, and our warehouse service, are about.

FAQ: FIFO vs LIFO for e-commerce