FIFO vs LIFO is a choice about the order in which inventory leaves your business. FIFO, first in first out, ships the oldest stock first. LIFO, last in first out, ships the most recent arrivals first.
The comparison trips people up because it covers two separate things. There is the physical rotation of goods on the floor, and there is the accounting method used to value what you sold. They can differ, and in many businesses they do.
Getting the distinction straight matters. One decision affects spoilage and obsolescence, the other affects your reported profit and tax position.
What FIFO vs LIFO means on the floor
Physically, FIFO means the pallet that arrived first is the pallet you pick first. It requires either date tracking in the system or racking that naturally presents older stock, such as flow racks that load from the back.
Physical LIFO is rarely a deliberate choice. It usually happens by accident when someone places new stock in front of old stock, and the older units slowly work their way to the back of the bin and expire there.
What the two methods mean in accounting
As a costing method, the question is which unit cost you assign to a sale when you bought the same item at different prices. FIFO assigns the oldest cost, LIFO assigns the newest.
When prices are rising, FIFO reports a lower cost of goods sold and therefore a higher profit. LIFO reports a higher cost and a lower profit, which reduces taxable income in the short term.
Importantly, your accounting method does not have to match your physical rotation. A business can rotate stock strictly by date while still valuing it on a LIFO basis in the accounts.
Where FIFO is the only sensible option
Anything with an expiry date, a shelf life, or a fashion cycle needs FIFO rotation. Food, pharmaceuticals, cosmetics, batteries and chemicals all degrade, so shipping the newest first guarantees eventual write-offs.
Technology and seasonal goods follow the same logic even without a printed date. A handset or a garment loses value every month it sits, and the loss is real whether or not the accounts record it.
When LIFO costing gets considered
LIFO costing is mainly a tax and reporting strategy used where input costs climb steadily, such as in some commodity and industrial businesses. By matching recent higher costs against current revenue, it lowers reported profit during inflationary periods.
There is a significant catch. US tax rules permit LIFO, but international accounting standards prohibit it, so businesses reporting internationally generally cannot use it.
Why FIFO vs LIFO affects your write-offs
Poor rotation shows up as obsolescence long before anyone calls it that. Stock sits at the back of a bin, misses its window, and eventually goes to clearance or the skip.
Because the loss arrives slowly, it rarely triggers an alarm. Tracking the age profile of your inventory, rather than just the quantity, is what makes the problem visible while you can still act on it.
Making FIFO work in practice
FIFO needs three things: a received date or batch code on every unit, a system that directs pickers to the oldest batch, and racking that does not make the right behaviour awkward.
Most operations overlook that last point. If following FIFO means moving three pallets to reach the correct one, pickers will take the easy pallet, and no amount of policy will change that.
FEFO, the variant worth knowing
FEFO, first expired first out, picks by expiry date rather than arrival date. For perishables it is more accurate than FIFO, because a batch received later can legitimately expire sooner.
If you handle anything with a use-by date, FEFO is usually the rule you actually want, with FIFO as the fallback where no expiry date exists.
Choosing between FIFO vs LIFO
For physical rotation, FIFO or FEFO wins for almost everyone. The exceptions are genuinely non-perishable bulk materials, such as aggregate or coal, where pulling from the top of a pile is simply practical.
For costing, treat it as a finance decision rather than a warehouse one. The right answer depends on your tax jurisdiction, your reporting obligations and your price environment, so it belongs with your accountant.
How the choice fits your systems
Enforcing rotation is a system capability, not a matter of discipline. Check that your warehouse management system can direct picks by batch date and block the wrong one. Accurate records make this reliable, which is why cycle counting and rotation go together, and why your racking layout should support the rule rather than fight it. On the accounting side, the IRS sets out the rules for inventory costing methods in the US, while the FASB publishes the underlying reporting standards.
Frequently asked questions about FIFO vs LIFO
Can you use FIFO physically and LIFO for accounting?
Yes, and plenty of businesses do. The physical flow and the costing assumption are separate decisions, though you should document clearly which you apply where.
Is LIFO allowed everywhere?
No. US tax rules permit it, but international accounting standards prohibit it, so many businesses outside the United States cannot use it.
Which method is better during inflation?
For tax purposes LIFO typically reduces reported profit when costs are rising. For physical handling, FIFO remains better regardless of the price environment.
The practical takeaway
Rotate stock with FIFO, or FEFO if anything carries an expiry date, and build racking and system rules that make the correct pick the easy one. Then treat the costing question separately, as a finance decision shaped by your tax jurisdiction and reporting obligations.