How do I compute the dollar-value LIFO index and new layers?

Question

AcadiFi · Accepted Answer

Dollar-value LIFO (DVL) converts inventory to base-year dollars to strip out inflation, then applies a price index to determine real quantity changes and inflation-driven layers.

Cascade Machinery mechanics:
- Current year price index: $3,800K / $3,100K = 1.2258 (22.58% inflation from base)
- Base-year inventory equivalent: $3,100K
- Real increase in base dollars: $3,100K - ($2,400K base + $600K prior layer) = $100K new layer at base cost
- New layer at current cost: $100K x 1.2258 = $122.58K
- Total ending DVL inventory: $2,400K (base) + $600K x 1.125 (prior layer at its index) + $122.58K = $3,247.58K

Wait — prior layer stays at its original index, not revalued. So ending inventory = base $2,400K + prior layer $675K (already at 1.125) + new layer $122.58K = $3,197.58K.

Why DVL over unit-LIFO?
- Pools items by dollar value, not SKU — avoids layer liquidation when model changes
- Reduces clerical burden for manufacturers with thousands of SKUs
- Price index can use double-extension, link-chain, or IRS-published indexes

Analyst checks: a sudden index jump with flat real volumes suggests inflation is inflating reported margins artificially. Compare the DVL index to supplier PPI to validate reasonableness. Firms that switch from unit-LIFO to DVL near liquidation events may be hiding layer-liquidation profits — investigate the timing.

How do I compute the dollar-value LIFO index and new layers?

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