Dollar-Value LIFO in 4 Steps With a Worked Example
Dollar-value LIFO is a last-in, first-out (LIFO) inventory method that measures a pool of related goods in dollars, not units. You divide ending inventory by a price index to restate it at base-year prices, so inflation alone can’t create a layer. An increase in inventory measured at base-year prices creates a new layer priced at that year’s index. Ending inventory is the sum of surviving layers.
A supplier of workshop equipment may replace one model with another or stock a different mix of parts. Counting each model separately can make inventory appear to shrink in one line while an economically similar line grows. A properly defined dollar-value pool lets the accountant measure the change in the group.
Prefer to watch first? In this lesson (about 11 minutes), Professor Farhat compares traditional LIFO with dollar-value LIFO (0:00), explains why companies use it (4:45), and walks through the calculation (7:39). The video groups the work into three steps: deflate, identify layers, and reinflate. This guide splits the comparison into its own step, so you’ll see four.
How to calculate dollar-value LIFO in four steps
- Deflate ending inventory. Divide the ending pool at current-year cost by the current price index. If the index is 115%, enter 1.15. The result is measured in base-year dollars.
- Compare on a common basis. Subtract the prior ending pool at base-year prices from the current ending pool at base-year prices. A positive difference creates a layer. A negative difference consumes existing layers.
- Price the change. Multiply a new layer by the current year’s index. For a decline, remove base-year dollars from the newest surviving layer first, using the index assigned when that layer was created. If the decline is bigger than that layer, keep working backward through older layers. The base layer shrinks only after every later layer is gone.
- Add the surviving layers. First check that their base-year amounts total the deflated ending pool. Then sum their separately priced amounts to determine reported ending inventory.
Worked dollar-value LIFO example
In this hypothetical example, Alder Tool Supply adopts dollar-value LIFO with a single $50,000 pool and a base index of 1.00. Its year-end records give the current cost and cumulative price index for each later year. Read the two right-hand columns separately. One lets Alder compare pool size. The other is the amount it reports as inventory.
| Period | Current cost | Index | Base-year cost | LIFO inventory |
|---|---|---|---|---|
| Base | $50,000 | 1.00 | $50,000 | $50,000 |
| Year 1 | $66,000 | 1.10 | $60,000 | $61,000 |
| Year 2 | $66,700 | 1.15 | $58,000 | $58,800 |
| Year 3 | $74,400 | 1.20 | $62,000 | $63,600 |
Year 1 adds a layer. Divide $66,000 by 1.10 to get $60,000 at base prices. The pool grew by $10,000 in base dollars, which costs $11,000 at the Year 1 index. Add it to the original $50,000 to get $61,000.
Year 2 partially liquidates that layer. Current cost rises by $700, yet $66,700 ÷ 1.15 gives only $58,000 at base prices. The pool lost $2,000 of base-year value. Remove $2,000 × 1.10, or $2,200, from the Year 1 layer. The base survives at $50,000, and $8,000 of Year 1 base dollars survive at 1.10. Ending inventory is $58,800.
Year 3 creates a fresh layer. The deflated pool grows from $58,000 to $62,000. The new $4,000 layer uses 1.20 and contributes $4,800. Add $50,000 + $8,800 + $4,800 to get $63,600. The retired portion of Year 1 does not return at 1.10 simply because the business restocked. For the income effect of releasing older costs, see LIFO liquidation and gross profit.
How do you build a price index with double-extension?
Where do the indexes come from? A problem may provide a suitable external index or ask for an internal index tailored to the pool. A general consumer index and an industry-specific index may track different changes. Read which index or method the facts specify and use it consistently. With double-extension, price the same ending quantities twice, once at base-year unit costs and again at current unit costs. Divide the current total by the base total.
| Item on hand | At base prices | At current prices |
|---|---|---|
| 100 short brackets | 100 × $4 = $400 | 100 × $5 = $500 |
| 50 long brackets | 50 × $12 = $600 | 50 × $13 = $650 |
| Same ending mix | $1,000 | $1,150 |
The internal index is $1,150 ÷ $1,000 = 1.15. This measures price change for the actual ending mix. An unweighted average of the two percentage price increases would give the items equal importance regardless of the dollars invested in each. Using beginning quantities in one column and ending quantities in the other would mix price change with a change in inventory composition.
Internal indexes take work when new products replace older models and base-year prices must be established. For the mechanics of pool indexes, historical layers and double-extension, see U.S. Treasury Regulation § 1.472-8(e). The regulation addresses tax inventory methods.
How is dollar-value LIFO different from other LIFO methods?
| Approach | What the accountant compares |
|---|---|
| Specific-goods LIFO | Units of each individual inventory item |
| Specific-goods pooled LIFO | Comparable physical units within a pool of similar goods |
| Dollar-value LIFO | Value of a qualifying pool after expressing it at base-year prices |
A broader pool allows related goods to offset one another, but setting pool boundaries requires judgment. Splitting a pool can bring old costs into earnings when one product declines even if another grows. SEC staff guidance says that setting up separate pools mainly to trigger LIFO liquidations is unacceptable, and the Commission has acted against a company that realigned its pools to boost reported income. SEC guidance on LIFO pooling, Topic 5.L
New to LIFO itself? Start with FIFO vs LIFO, then come back here. Retailers usually apply the same idea through the dollar-value LIFO retail method, which works with retail prices instead of cost.
When can a company use dollar-value LIFO?
Dollar-value LIFO is allowed under U.S. GAAP (FASB ASC 330, Inventory) and for U.S. federal income tax under IRC Section 472 and Treasury Regulation § 1.472-8. It is not allowed under IFRS, because IAS 2 prohibits LIFO in any form.
Three rules come up often:
- LIFO conformity rule. A company that uses LIFO on its tax return generally must also use LIFO in its financial statements (IRC § 472(c)).
- Electing LIFO. For tax purposes, a business adopts LIFO by filing Form 970, Application to Use LIFO Inventory Method. Once it picks its pools and computation method, changing them generally requires IRS consent.
- Write-downs. Under U.S. GAAP, LIFO inventory is tested at the lower of cost or market (LCM). Most other methods, such as FIFO and average cost, use the lower of cost and net realizable value (LCNRV). For U.S. federal income tax, LIFO inventory is valued at cost regardless of market value.
For CPA candidates, inventory falls under Area II (Select Balance Sheet Accounts) of the AICPA’s FAR blueprint.
Common dollar-value LIFO mistakes on exams
Watch for these traps when you work dollar-value LIFO problems.
- Comparing current-cost totals. Alder’s Year 2 current cost rose $700, yet the pool shrank by $2,000 in base-year dollars. Always compare base-year amounts.
- Pricing a new layer at 1.00. Alder’s Year 1 layer is $10,000 in base dollars, but it enters inventory at $11,000 because it uses the 1.10 index.
- Repricing old layers. Each layer keeps the index from the year it was created. Never multiply the whole pool by the current index.
- Bringing back a liquidated layer. Alder restocked in Year 3, but the $2,000 removed in Year 2 does not return at 1.10. The growth creates a new layer at 1.20.
- Using 115 instead of 1.15. Convert an index stated as 115 to 1.15 before you divide or multiply.
Interactive dollar-value LIFO exercise
How do you calculate ending inventory under dollar-value LIFO? Divide ending inventory at current prices by the current-year price index to express it at base-year prices. Compare the result with the prior year’s base-year balance. If the pool grows, multiply the increase by the current-year index, then add the new layer’s cost to the cost of the existing layers. If the pool shrinks, remove the decrease from the newest layer first at that layer’s own index, then work backward through older layers.
Key takeaways
- Dollar-value LIFO measures a pool in base-year dollars, so price changes alone don’t create or remove layers.
- Deflate ending inventory with the current index, then compare it with last year’s base-year total.
- A new layer is priced at the index for the year it was added, and it keeps that index.
- A decline removes the newest layer first, at that layer’s own index, then older layers in reverse order.
- Double-extension builds the index by pricing the same ending quantities at base-year and current costs.
Practice questions
1. A pool costs $96,000 at current prices and its index is 1.20. What is its base-year cost?
$80,000. Divide $96,000 by 1.20. Compare the result with the preceding period’s base-year amount to find the layer change.
2. In the same pool, prior ending base-year cost was $75,000. How much does the new layer contribute to LIFO inventory?
$6,000. The $5,000 base-dollar increase is priced at the current 1.20 index. Earlier layers keep their own indexes.
3. A pool loses $3,000 in base dollars. Its most recent layer has $5,000 in base dollars at 1.08. How much LIFO cost is removed?
$3,240. Remove $3,000 × 1.08. The $2,000 base-dollar remainder stays in that same layer at 1.08.
4. Alder’s Year 4 ending inventory costs $63,000 at current prices, and the index is 1.25. What is LIFO ending inventory?
$50,440. Divide $63,000 by 1.25 to get $50,400 at base prices, an $11,600 drop from $62,000. First remove the whole Year 3 layer: $4,000 in base dollars, or $4,800 at 1.20. The other $7,600 comes out of the Year 1 layer ($7,600 × 1.10 = $8,360). That leaves $400 of Year 1 base dollars at 1.10, or $440. Ending inventory is $50,000 + $440 = $50,440.
Want more practice like this? Work through the inventory lessons in the full Intermediate Accounting course.
Frequently asked questions
Can current-cost inventory rise while a layer is liquidated?
Yes. In Alder’s Year 2, prices rose enough to mask a decline in the pool measured at base prices.
Is an index of 115 the same as 1.15?
Yes, if the table uses 100 for the base year. Divide 115 by 100 before using it as a multiplier or divisor.
How is a layer different from a LIFO reserve?
A layer is one slice of the inventory pool, added in a specific year and priced at that year’s index. A LIFO reserve is the difference between inventory measured at the cost method a company uses internally (often FIFO) and inventory measured at LIFO, for the inventory as a whole.
What happens if a decline is bigger than the newest layer?
Keep removing base-year dollars from older layers in reverse order, each at its own index. The base layer shrinks only after every later layer is gone. Practice question 4 shows how this works.
Is dollar-value LIFO allowed under IFRS?
No. IAS 2 does not permit LIFO in any form, so dollar-value LIFO is a U.S. GAAP and U.S. tax method.
What is the difference between double-extension and link-chain?
Double-extension prices the ending quantities at both base-year and current costs every year. Link-chain builds a one-year index each year and multiplies the years together to get a cumulative index. For tax purposes, Treasury Regulation § 1.472-8(e)(1) generally requires double-extension and restricts alternative index and link-chain methods when those methods fall under its general rules. The inventory price index computation (IPIC) method has a separate exception under § 1.472-8(e)(3). A taxpayer using IPIC may choose double-extension or link-chain without showing that another method is impractical or unsuitable.
Which write-down test applies to LIFO inventory?
Lower of cost or market (LCM) under FASB ASC 330. The lower of cost and net realizable value test applies to most other cost methods, such as FIFO and average cost.
About the author
Mansour Farhat, CPA, CIA, DBA, teaches accounting and exam-prep courses for CPA, CMA, and EA candidates and accounting students at Farhat Lectures, where he records the video lessons and builds the practice exercises that go with them.
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