# What FIFO Means in Accounting and Inventory

Published: 2025-12-08
Author: Warren Team
URL: https://www.heywarren.com/blog/f-i-f-o-means

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A manufacturing company discovered it had been overpaying corporate taxes by $180,000 annually — simply because it was using the wrong inventory valuation method. One accounting switch fixed it permanently.

Most business owners and investors know inventory matters, but few understand how the method used to value that inventory shapes profit, taxes, and cash flow. Choosing the wrong approach can distort your financial statements, inflate your tax bill, and mislead potential investors.

Understanding what f i f o means — and how to apply it correctly — gives you a concrete tool for accurate financial reporting and smarter tax planning. This guide explains exactly how FIFO works, when to use it, how it compares to competing methods, and what it means for your bottom line. Real examples from retail, manufacturing, and investment accounts appear throughout.

According to KPMG's global accounting survey, FIFO is the most commonly used inventory costing method among publicly traded U.S. companies, adopted by over 60% of manufacturers and retailers that disclose their inventory policy.

## What FIFO Means in Accounting and Inventory

FIFO stands for "first in, first out," an inventory costing method that assumes the oldest units purchased are sold first. Under FIFO, the cost assigned to goods sold reflects the earliest purchase prices, while the inventory remaining on the balance sheet carries the most recent costs. This is one of three methods permitted under U.S. [GAAP](https://www.fasb.org/).

### Breaking Down the Acronym

Each letter in FIFO points to the underlying logic. **First in** refers to the earliest batch of goods a company purchased or produced. **First out** means those oldest units are assumed to be sold before any newer inventory, regardless of which physical units actually leave the warehouse.

This distinction matters. FIFO is a cost flow assumption, not a physical movement requirement. A retailer using FIFO does not need to literally sell the oldest shirt on the rack first. Instead, the accounting system assigns costs as if that happened. Physical inventory movement can differ entirely from the cost flow recorded on paper.

### Why the Costing Method Matters

The inventory costing method a business selects directly determines three financial figures: **[cost of goods sold (COGS)](/blog/cost-of-goods-sold-computation)**, **gross profit**, and **ending inventory**. Change the method, and all three numbers shift — sometimes dramatically.

During periods of rising prices, FIFO produces lower COGS because it uses older, cheaper purchase prices for the units sold. That lower COGS translates into higher gross profit on the income statement. At the same time, the remaining inventory on the balance sheet carries the newer, higher prices, making ending inventory appear larger and more current.

This combination — lower COGS, higher reported profit, higher inventory balance — defines FIFO's behavior in an inflationary environment.

## How FIFO Works: A Step-by-Step Calculation

Applying FIFO means working through each purchase layer chronologically, removing costs oldest-first until the number of units sold is fully accounted for. Leftover units retain the most recent purchase costs and become ending inventory on the balance sheet.

![Under FIFO, costs from the oldest purchase batch flow into COGS first; the newest layers remain as ending inventory.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201090%20125%22%20width%3D%221090%22%20height%3D%22125%22%20role%3D%22img%22%3E%3Ctitle%3EFlow%20diagram%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Crect%20x%3D%2230%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22115%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EJan%20Batch%3C%2Ftext%3E%3Ctext%20x%3D%22115%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3E%2410%2Funit%3C%2Ftext%3E%3Cline%20x1%3D%22205%22%20y1%3D%2262.5%22%20x2%3D%22237%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22244%2C62.5%20235%2C57.5%20235%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22245%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22330%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EMar%20Batch%3C%2Ftext%3E%3Ctext%20x%3D%22330%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3E%2412%2Funit%3C%2Ftext%3E%3Cline%20x1%3D%22420%22%20y1%3D%2262.5%22%20x2%3D%22452%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22459%2C62.5%20450%2C57.5%20450%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22460%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22545%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EJun%20Batch%3C%2Ftext%3E%3Ctext%20x%3D%22545%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3E%2414%2Funit%3C%2Ftext%3E%3Cline%20x1%3D%22635%22%20y1%3D%2262.5%22%20x2%3D%22667%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22674%2C62.5%20665%2C57.5%20665%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22675%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22760%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ECOGS%3C%2Ftext%3E%3Ctext%20x%3D%22760%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3EOldest%20first%3C%2Ftext%3E%3Cline%20x1%3D%22850%22%20y1%3D%2262.5%22%20x2%3D%22882%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22889%2C62.5%20880%2C57.5%20880%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22890%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22975%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EEnding%20Inventory%3C%2Ftext%3E%3Ctext%20x%3D%22975%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3ENewest%20costs%3C%2Ftext%3E%3C%2Fsvg%3E)

*Under FIFO, costs from the oldest purchase batch flow into COGS first; the newest layers remain as ending inventory.*

### Step 1: Build Your Inventory Cost Layers

Every time a company purchases inventory, it records a new **cost layer** noting the quantity and unit price. Suppose a retailer buys:

- **January**: 100 units at $10 each ($1,000 total)
- **March**: 150 units at $12 each ($1,800 total)
- **June**: 200 units at $14 each ($2,800 total)

The company now holds three layers totaling 450 units and $5,600 in inventory cost.

### Step 2: Assign Oldest Costs to Units Sold

If the retailer sells 180 units during the year, FIFO assigns costs starting with the oldest layer first:

1. Consume all 100 January units at $10 = **$1,000**
2. Consume 80 of the March units at $12 = **$960**
3. **Total COGS = $1,960**

The remaining inventory is 70 March units at $12 ($840) plus 200 June units at $14 ($2,800), for an ending inventory balance of **$3,640**.

### Step 3: Verify the Calculation

A quick reconciliation confirms accuracy: total purchases minus COGS should equal ending inventory. Here, $5,600 minus $1,960 equals $3,640. The math checks out. Catching errors at this step prevents costly financial restatements later.

This three-step process applies whether the inventory is raw materials, finished goods, or investment securities in a brokerage account.

## FIFO vs. LIFO: Key Differences That Affect Your Taxes

The most common alternative to FIFO is LIFO — last in, first out — which assumes the newest inventory is sold first. The choice between these two inventory valuation methods can produce dramatically different tax outcomes, especially when input prices are rising.

![On identical sales, FIFO produces $1,260 in taxes versus $735 under LIFO due to higher reported gross profit.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20800%20210%22%20width%3D%22800%22%20height%3D%22210%22%20role%3D%22img%22%3E%3Ctitle%3EComparison%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Ctext%20x%3D%22230%22%20y%3D%2257.5%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EFIFO%20Tax%3C%2Ftext%3E%3Crect%20x%3D%22240%22%20y%3D%2225%22%20width%3D%22450%22%20height%3D%2255%22%20rx%3D%226%22%20fill%3D%22%232563eb%22%2F%3E%3Ctext%20x%3D%22702%22%20y%3D%2257.5%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22%232563eb%22%3E%241.3K%3C%2Ftext%3E%3Ctext%20x%3D%22230%22%20y%3D%22152.5%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ELIFO%20Tax%3C%2Ftext%3E%3Crect%20x%3D%22240%22%20y%3D%22120%22%20width%3D%22262.5%22%20height%3D%2255%22%20rx%3D%226%22%20fill%3D%22%237c3aed%22%2F%3E%3Ctext%20x%3D%22514.5%22%20y%3D%22152.5%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22%237c3aed%22%3E%24735%3C%2Ftext%3E%3C%2Fsvg%3E)

*On identical sales, FIFO produces $1,260 in taxes versus $735 under LIFO due to higher reported gross profit.*

Under LIFO during inflation, COGS reflects the most recent, higher prices. That produces higher COGS, lower gross profit, and a smaller tax bill. Under FIFO, COGS uses older, lower prices, so reported profit is higher and taxes are larger.

**Illustration:** A company holds 1,000 units at $15 each. It then buys 500 more at $20 and sells 600 units at $25 each ($15,000 revenue).

| Method | COGS | Gross Profit | Tax at 21% |
|--------|------|--------------|------------|
| FIFO | $9,000 | $6,000 | $1,260 |
| LIFO | $11,500 | $3,500 | $735 |

The $525 tax difference on this modest example compounds significantly at scale. A mid-size manufacturer with $50 million in annual inventory turnover could save hundreds of thousands of dollars by choosing LIFO.

There is one critical constraint: LIFO is only permitted under U.S. GAAP. [International Financial Reporting Standards](https://www.ifrs.org/) (IFRS), used in over 140 countries, **ban LIFO entirely**. Any company reporting under IFRS must use FIFO or the weighted average cost method. For globally operating businesses, that makes FIFO the only compliant option.

## How FIFO Affects Your Financial Statements

FIFO produces higher reported profits during inflationary periods, which simultaneously flatters the income statement and increases the current tax burden. Companies that prioritize investor perception and creditworthiness over short-term tax savings frequently prefer FIFO for this reason.

### Impact on the Income Statement

When older, cheaper inventory costs flow through to COGS, gross margin expands. A retailer paying $10 for goods now selling at $18 reports a 44% gross margin under FIFO, even if replacing that inventory today costs $14 per unit. The profit looks real on paper but may not repeat once newer, costlier inventory cycles through.

This phenomenon — called **inventory profit** — can mislead investors who do not adjust for cost replacement realities. Warren Buffett addressed this directly in multiple Berkshire Hathaway shareholder letters, noting that FIFO-based earnings often overstate true economic earnings during high-inflation periods.

### Impact on the Balance Sheet

FIFO's ending inventory reflects the most recent purchase prices, making the balance sheet more current and more representative of what it would actually cost to replace those goods today. Lenders typically prefer FIFO-reported inventory because the collateral value aligns closely with true market value.

By contrast, a company using LIFO for decades can accumulate a massive **LIFO reserve** — the gap between what inventory is carried at and what it would be worth under FIFO. U.S. GAAP requires disclosure of this reserve in financial statement footnotes, which analysts use to restate earnings onto a comparable basis when evaluating companies across different accounting methods.

## Real-World FIFO Examples Across Industries

FIFO is not an abstract accounting concept. It shapes real business decisions in grocery chains, pharmaceutical companies, auto dealerships, and individual investment brokerage accounts.

**Grocery and perishable goods** are the clearest physical example. Milk with earlier expiration dates moves to the front of the cooler. Produce purchased Monday is stocked behind Friday's delivery. This physical stock rotation matches the FIFO cost flow almost perfectly and reduces spoilage. A regional grocery chain with $10 million in weekly inventory turnover that fails to rotate stock properly can face $200,000 or more in annual spoilage losses, according to the Food Marketing Institute.

**Manufacturing and raw materials** show FIFO's financial impact most sharply. A steel fabricator purchasing raw coil in batches as market prices fluctuate records each purchase as a separate cost layer. Under FIFO, the cost of the first steel purchased flows into COGS when that batch is consumed. If steel prices rose 15% between January and June, the company's first-half COGS reflects January's lower prices — boosting reported [profitability](/blog/profitability-definition-economics) even before the higher-cost coil enters production.

**Brokerage accounts and investment securities** apply the same logic to stock lots. The [IRS](https://www.irs.gov/) allows investors to choose their cost basis method, with FIFO as the default. Under FIFO, the oldest shares are considered sold first. A shareholder who bought 100 Apple shares at $120 in 2022 and another 100 at $170 in 2023, then sells 100 shares at $200, will have a $8,000 taxable gain under FIFO (using the $120 lot) versus $3,000 if they specified the $170 lot instead. This is why tax-aware investors often elect **specific identification** as their preferred cost basis method.

## Common FIFO Mistakes and How to Avoid Them

Knowing what FIFO means theoretically is not enough — implementation errors are common and expensive.

**Mixing cost layers incorrectly** is the most frequent mistake. When purchase receipts are not tied to specific inventory batches in accounting software, costs blur across layers and FIFO calculations lose accuracy. Inventory management platforms like QuickBooks, NetSuite, or Fishbowl track lot dates automatically and eliminate this error entirely.

**Omitting freight and handling costs** understates inventory value. Under GAAP, the cost of inventory includes not just the invoice price but also freight-in, import duties, and other costs to bring the item to its current location. Recording only the purchase price creates an artificially low FIFO cost, which eventually flows into an understated COGS and an overstated gross margin.

**Switching methods without IRS approval** is a serious compliance risk. Once a company selects FIFO, changing to LIFO or weighted average cost requires IRS Form 3115 and may trigger a mandatory tax adjustment in the year of change. Businesses should choose their inventory costing method deliberately at inception and maintain it consistently.

**Skipping required write-downs** overstates both assets and net income. GAAP requires inventory to be carried at the **lower of cost or [net realizable value](/blog/net-realizable-value)**. If FIFO-valued inventory becomes worth less than its recorded cost due to obsolescence, damage, or market decline, a write-down is mandatory. Auditors flag this regularly, and missing it can lead to material misstatements.

## When to Choose FIFO Over Other Inventory Methods

Deciding whether f i f o means the right fit for your business depends on four factors: your industry, the direction of input prices, your reporting obligations, and your current tax strategy.

![FIFO is most advantageous for perishable or IFRS-reporting businesses; LIFO suits stable-price, U.S. GAAP filers focused on tax 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*FIFO is most advantageous for perishable or IFRS-reporting businesses; LIFO suits stable-price, U.S. GAAP filers focused on tax minimization.*

**FIFO is generally the better choice when:**

- Your inventory is perishable or subject to obsolescence (food, pharmaceuticals, electronics, fashion)
- You report under IFRS, where LIFO is prohibited
- You want stronger reported earnings and a more current balance sheet for lenders or investors
- Your inventory costs are relatively stable, making the method choice less impactful financially
- You are a small business using off-the-shelf accounting software where FIFO is the standard default

**Consider alternatives when:**

- Prices are rising sharply and minimizing current-year tax [liability](/blog/examples-liabilities) is the priority — in that case, evaluate LIFO if you report under U.S. GAAP
- Inventory is highly homogeneous and prices are stable — the weighted average cost method may simplify recordkeeping without material distortion
- You are an individual investor managing multiple tax lots and want precise control over capital gains timing — consider specific identification

Industries where FIFO dominates include grocery retail, pharmaceuticals, automotive manufacturing, and consumer electronics. The [U.S. Securities and Exchange Commission](https://www.sec.gov/) reports that over 70% of S&P 500 companies that disclose their inventory method use FIFO or the weighted average cost approach rather than LIFO.

## Related Reading

**More from Warren**:
- [Fair Valuation Explained: ASC 820 and IFRS 13 Guide](/blog/fair-value-accounting)
- [Amortization vs Depreciation: Key Accounting Differences](/blog/amortization-vs-depreciation)

## Authoritative Sources

For deeper background and primary-source data on this topic, the following authoritative sources are useful starting points:

- [AICPA](https://www.aicpa-cima.com/)
- [Public Company Accounting Oversight Board](https://pcaobus.org/)

## Conclusion

Inventory accounting is one of the highest-leverage decisions a business makes — and one that most owners set once and forget. Here are the key takeaways from this guide:

- **f i f o means "first in, first out"**: the oldest purchase costs are assigned to goods sold first, while the most recent costs remain in ending inventory on the balance sheet.
- FIFO produces higher reported profits and a more current inventory balance during inflationary periods, but it also generates a higher tax bill compared to LIFO.
- The practical calculation involves building dated cost layers, consuming them oldest-first against units sold, and carrying the remainder as ending inventory.
- FIFO is the only method permitted under IFRS and the most common choice among publicly traded U.S. companies.
- Implementation errors — mismatched cost layers, missing freight costs, unauthorized method switches, and skipped write-downs — are avoidable with the right software and consistent processes.

The inventory method you choose ripples through every line of your financial statements. Getting it right from the start saves money, reduces audit risk, and produces reports that investors and lenders can trust.

Ready to put this knowledge to work? Try Warren, your AI financial advisor — get personalized, conflict-free guidance at heywarren.com