Key Takeaways:
- Pick one method and keep it: The IRS expects you to use the same method every year, and changing it generally takes approval.
- Count and reconcile often: Compare physical counts to your records so small errors do not grow into big ones.
- Write down damaged or outdated stock: Carrying it at full cost overstates your assets and your profit.
- Include landed costs: Freight, duties, and inbound handling belong in the cost of your inventory.
Inventory valuation is how you put a dollar value on the products you still have on hand at the end of a reporting period. That value sits on your balance sheet as an asset and sets your cost of goods sold (COGS), which drives the profit you report and the taxes you pay.
This guide covers the four main valuation methods, a shared example, how to write down stock that has lost value, and how to choose the method that fits your store.
How Inventory Valuation Works
Inventory valuation starts with a simple equation. Beginning inventory plus purchases, minus ending inventory, gives you your cost of goods sold. Subtract COGS from net sales and you have your gross profit.
COGS = Beginning inventory + Purchases – Ending inventory Gross profit = Net sales – COGS
The cost you assign to each item should cover all prime costs of buying it and getting it ready to sell, such as the purchase price, freight, and taxes. Indirect costs like marketing and administration are left out. For taxes, the IRS expects you to choose one method, such as FIFO or the weighted average cost method, and use it every year.
Small business exception:
If your average annual gross receipts over the past three years are about $32 million or less (the 2026 limit), you may be exempt from formal inventory accounting rules for tax purposes. Confirm with a tax professional before relying on it.
Why Inventory Valuation Matters
Valuation matters more as retail inventory management gets harder to do by hand. Automated inventory management software keeps your numbers current, and an accurate value helps you decide how much to buy, which suppliers to use, and how much storage space you need.
- Profit: Your inventory value sets COGS and gross profit, so overstated inventory means overstated profit.
- Taxes: Your method changes taxable income. When prices rise, FIFO reports more taxable income than LIFO.
- Loans: Lenders look at the inventory value on your balance sheet, and some set limits on ratios such as current assets to current liabilities.
- Buying decisions: A clear value shows how much cash is tied up in stock, so you can avoid overbuying.
Inventory Valuation Methods at a Glance
| Method | How it works | Best for | When prices rise | Allowed under IFRS |
|---|---|---|---|---|
| FIFO | Oldest costs are sold first | Perishable goods and fast-moving stock | Higher profit, higher taxes | Yes |
| LIFO | Newest costs are sold first | U.S. businesses with rising costs that want lower taxes | Lower profit, lower taxes | No |
| Weighted average | Every unit gets the average cost | Many identical or similar items | Between FIFO and LIFO | Yes |
| Specific identification | Each unit keeps its actual cost | Unique, high-value, or serialized items | Depends on which units you sell | Yes |
Inventory Valuation Methods Explained
The examples below use one data set so you can compare results side by side. Priya owns a gift shop. She starts the month with 100 candles that cost $10 each, buys 200 more at $12 each for a total cost of $3,400, and sells 220 candles at $20 each. That leaves 80 candles in stock.
FIFO (First-In, First-Out)
FIFO assumes you sell your oldest stock first, so the oldest costs move to COGS and the newest costs stay in ending inventory. It is the most widely used method among retailers and works best when your real stock rotation matches that assumption.
Priya’s 220 sales use the 100 candles at $10 and 120 of the candles at $12. Her COGS is $2,440 and her 80 remaining candles are valued at $960.
| Pros | Cons |
|---|---|
| Easy to understand and apply | Raises taxable income when prices rise |
| Accepted everywhere, including under IFRS | Older costs may not reflect what it costs to restock today |
| Matches the way most goods move, which helps limit dead stock | Works less well when prices swing widely |
LIFO (Last-In, First-Out)
LIFO assumes your newest stock sells first, so the latest and usually higher costs go to COGS. When prices rise, that lowers your reported profit and your tax bill. It is allowed in the United States but not under IFRS, and it is a poor fit for perishable goods.
Priya’s 220 sales use all 200 candles at $12 and 20 of the candles at $10. Her COGS is $2,600 and her 80 remaining candles are valued at $800.
| Pros | Cons |
|---|---|
| Lowers taxes when costs are rising | Complex to maintain and requires detailed records |
| Matches recent costs to current revenue | Not allowed under IFRS, which limits international growth |
| Fewer inventory write-downs | If you use it on your tax return, you must use it in your financial statements too |
Weighted Average Cost (WAC)
The weighted average cost method divides the total cost of goods available for sale by the total units available. Every unit gets the same average cost, which smooths out price swings. It suits stores that sell many identical or very similar items, and you can learn more in our guide to the average cost inventory method.
Priya’s average cost is $3,400 divided by 300 units, or about $11.33 per candle. Her COGS for 220 candles is $2,493.33 and her 80 remaining candles are valued at $906.67.
| Pros | Cons |
|---|---|
| Reduces profit swings caused by purchase timing | Can give inaccurate balance sheet figures when prices swing a lot |
| No need to track each purchase batch separately | Less precise when items differ widely in cost |
| Simple for large volumes of similar items | The average must be recalculated as new purchases arrive |
Specific Identification
Specific identification tracks the actual cost of each item from the day it arrives until it sells. It fits unique or high-value goods, such as jewelry, art, or used equipment. Serial numbers or RFID data collection make it practical to track each unit.
Marcus sells estate jewelry. He holds two rings that cost $1,500 and $1,750 and has already sold a third, so his inventory is worth $3,250.
| Pros | Cons |
|---|---|
| Most accurate method available | Requires item-level tracking and detailed counts |
| Shows the exact cost and profit on every sale | Impractical for thousands of identical items |
| Ideal for high-value, low-volume goods | Can be manipulated if you choose which unit to sell |
How the Methods Compare on One Example
Prices rose in Priya’s example, so FIFO shows the most profit (and the most taxable income) and LIFO shows the least. Total cost is $3,400 under every method. The methods only change how that cost is split between COGS and ending inventory.
| Method | COGS | Ending inventory | Gross profit on $4,400 in sales |
|---|---|---|---|
| FIFO | $2,440.00 | $960.00 | $1,960.00 |
| LIFO | $2,600.00 | $800.00 | $1,800.00 |
| Weighted average | $2,493.33 | $906.67 | $1,906.67 |
Retail and Gross Profit Estimation Methods
Stores with thousands of SKUs often cannot track the cost of every item. Two estimation methods fill that gap, but they are estimates, so confirm them with regular physical counts.
- Retail inventory method: Value your stock at retail prices, then multiply by your cost-to-retail ratio (the cost of goods available divided by their retail value). Use it when you count stock at selling prices and lack item-level cost data.
- Gross profit method: Estimate COGS as sales times (1 minus your usual gross margin), then subtract it from the goods available for sale. Use it when you need an estimate between physical counts, such as for monthly statements or an insurance claim.
Writing Down Inventory That Loses Value
Inventory should never sit on your books for more than it is worth. Under U.S. GAAP, FIFO and weighted average users value each item at the lower of its cost or its net realizable value (NRV), which is the expected selling price minus the cost to sell it. If NRV is lower, you write the item down to that amount.
You can run this test item by item or on groups of similar items. Item by item is the most precise and catches every loss, while grouping is faster but lets gains in one item hide losses in another.
Choosing the Right Inventory Valuation Method
No single method is best for every store. Start with what you sell, then check price trends, tax rules, and the tools you have.
| Situation | Best fit | Why |
|---|---|---|
| Perishable or dated goods, such as food, beverages, or cosmetics | FIFO | Matches how you rotate stock and limits spoilage. |
| Many identical items, such as bulk goods or accessories | Weighted average | Simple to run and smooths cost swings. |
| Unique or serial-numbered items, such as jewelry, art, or used equipment | Specific identification | Tracks the real cost of each item. |
| U.S. business with rising costs and lower taxes as the priority | LIFO | Matches recent higher costs to sales, but takes more work. |
| Plans to report under IFRS, bring in investors, or sell the business | FIFO or weighted average | Widely accepted and easy for outsiders to read. |
Check these factors before you decide:
- Tax and reporting rules: LIFO is allowed under U.S. GAAP but not IFRS. Ask your accountant which methods your tax situation allows.
- Systems and effort: Specific identification needs item-level tracking. FIFO and LIFO need purchase dates and costs. Weighted average only needs totals.
- Growth: FIFO and weighted average scale easily. Specific identification gets unwieldy with large volumes, and LIFO can complicate long-term reporting.
Common Inventory Valuation Mistakes
These four mistakes show up most often, and each one has a simple fix.
| Mistake | What goes wrong | How to fix it |
|---|---|---|
| Inaccurate counts and skipped reconciliation | Records show 120 units but the shelf holds 100, so you overstate assets and profit. Theft, damage, and entry errors go unnoticed. | Run regular cycle counts and compare them to your system. Investigate every gap. |
| Switching methods without a reason | Financial statements become inconsistent, and the IRS generally requires approval for a change. | Choose a method that fits your business and keep it. Document and disclose any change. |
| Ignoring obsolete or damaged stock | Spoiled, outdated, or damaged items stay at full cost and inflate your assets. | Review stock on a schedule and write items down to net realizable value. |
| Leaving out landed costs | Inventory is valued below its true cost, which distorts margins and pricing. | Add freight, import duties, transit insurance, and inbound handling to each item’s cost. |
How KORONA POS Simplifies Inventory Valuation
KORONA POS is inventory management software built for retail. It flags problems such as products with negative stock or slow sales so you can deal with them first.
You can also set user permissions so staff can run counts without seeing your full inventory values. See it in action with a free trial or a demo with a product specialist.
Get started with KORONA POS today!
Explore all the features that KORONA POS has to offer with an unlimited trial. There’s no commitment or credit card required.
Inventory Valuation FAQs
What is the best method of inventory valuation?
No single method is best for every business. For many retailers, FIFO or weighted average cost is the best fit because both are simple, widely accepted, and easy to keep accurate. Your products, tax situation, and software all affect the right choice.
Can you change your inventory valuation method?
Yes, but not freely. For taxes, you generally need IRS approval, usually by filing Form 3115, and you should have a valid reason for the change. A tax professional can confirm the steps for your situation.
How often should you value your inventory?
At a minimum, at the end of every reporting period, including year-end for your tax return. Regular cycle counts between those dates catch errors early.
