A fuel dealer’s $40 gross margin can contain a $30 gain from oil becoming more expensive while it sat in storage. Treating the whole margin as repeatable trading performance misses the distinction that national accountants make when they adjust profits for inventory valuation.[1][2]

The figures below are a hypothetical accounting example, not observed oil prices or an earnings forecast. All amounts are in US dollars.

The old invoice makes the margin look larger

Imagine a dealer that bought a barrel of heating oil in an earlier accounting period for $60. It now sells that barrel to a household for $100, when buying equivalent replacement oil would cost $90. Assume unchanged quality, no hedges, and no taxes, delivery costs or other expenses, so the example isolates the inventory effect.

Using the original purchase invoice, the gross margin is $40: the selling price less the historical cost. Using the cost of equivalent oil at the time of sale, the trading margin is $10. The remaining $30 is the holding gain: the increase from the old purchase price to the current replacement price.

The dealer has made a sale and earned a distribution margin. It has also benefited from owning a commodity during a price increase. The Australian Bureau of Statistics separates these effects by valuing goods withdrawn for resale at their current value before the wholesaler’s or retailer’s margin.[2]

The distinction becomes tangible when the dealer restocks. Replacing the barrel absorbs $90 of the $100 received, leaving $10 before the expenses excluded here. Buying cheaply was valuable; reproducing the original $40 margin now requires another favorable price movement or a wider selling spread. That is an inference from the example, not a prediction about oil.

Why the household’s spending is not all new output

The oil was produced earlier. National accounts use inventory movements to put production in the period when it occurred, rather than counting the entire value again when someone finally buys it. BEA’s inventory handbook illustrates this principle with a vehicle moving from manufacturer to dealer to consumer.[3]

In our simplified example, household consumption rises by $100, while the inventory withdrawal is valued at $90. The difference is $10 of current trading output. Using the old $60 invoice for the withdrawal would leave $40, incorrectly including the holding gain in current production.

This correction already belongs in nominal GDP. It is not merely what happens when statisticians remove inflation to calculate real GDP. Statistics Canada explains that inventory capital gains are excluded from gross value added and recorded in the revaluation account; it separately describes the decomposition of nominal GDP into price and volume changes.[4]

The questions differ. Inventory valuation asks how much of a transaction represents current productive activity. Deflation asks how much measured production changed in volume after accounting for prices. Nominal GDP can rise because newly produced goods command higher prices while still excluding appreciation on goods produced before the measurement period.[4]

The adjustment runs through profits too

The US measure of corporate profits from current production includes an inventory valuation adjustment, or IVA, alongside a separate capital consumption adjustment for depreciation. BEA converts historical-cost information into measures consistent with the production recorded in GDP.[1]

In the dealer example, removing the holding gain reduces the historical-cost margin to the current trading margin. That is a conceptual bridge, not a claim that a company must rewrite its financial statements. Nor does an unsold barrel automatically generate booked profit simply because its market price rises: the example deliberately waits for a sale.

Accounting methods matter. BEA notes that, under its illustrated conditions, last-in, first-out accounting can already value withdrawals at current-period prices when inventories are accumulating, leaving no IVA. A negative adjustment cannot therefore be inferred from rising commodity prices alone.[3]

Falling prices also need attention. Ireland’s Central Statistics Office describes the corresponding correction for holding losses. The rule removes the effect of owning inventories through price changes in either direction; it does not systematically penalize profitable businesses.[5]

The gain is real, but its source matters

The strongest counterweight is that the holding gain can become spendable money. The ABS distinguishes an unrealized gain on an asset still owned from one realized when that asset is sold. Excluding the gain from production does not erase its benefit to the owner.[2]

A dealer winding down could keep the proceeds instead of replacing the stock. A continuing dealer could also earn more through higher volumes, better service or a wider spread over replacement cost. The adjustment alone cannot tell an investor whether a business is attractive.

The investment hypothesis to test is that a dealer’s elevated historical-cost margin chiefly reflects a temporary inventory windfall. That hypothesis would be falsified for a particular business if its margin over contemporaneous replacement cost stayed elevated after the low-cost stock had sold through, with comparable product mix and expenses. That would demonstrate operating improvement beyond further gains from holding stock.

What to watch when the next numbers arrive

• At the first earnings report after the old stock sells through: read the inventory-costing policy and any reconciliation of inventory effects. Check whether the margin over contemporaneous replacement cost remains elevated after replenishment.
• At the next BEA quarterly corporate-profits release: distinguish profits before adjustment from profits with IVA and capital consumption adjustment. The latter measures current production; the depreciation adjustment answers a separate question.[1]
• At the next GDP inventory revision: separate a change in book value from inventory investment, and inventory investment from its contribution to growth. BEA’s handbook explains that the growth contribution depends on the change in inventory investment between periods.[3]

Sources

1. U.S. Bureau of Economic Analysis, “Gross Domestic Product Release—Additional Information,” definitions and statistical conventions, checked October 31, 2026 — current-production profits, IVA and capital consumption adjustment.
2. Australian Bureau of Statistics, “Holding gains,” Australian System of National Accounts: Concepts, Sources and Methods, Edition 8, January 20, 2026, paragraphs 16.9–16.15 — realized gains and valuation of goods withdrawn for resale.
3. U.S. Bureau of Economic Analysis, NIPA Handbook, Chapter 7: “Change in Private Inventories,” December 2024, pages 7-2–7-8 and Appendix A — production timing, inventory flows, growth contributions and accounting-method differences.
4. Statistics Canada, User Guide: Canadian System of Macroeconomic Accounts, Chapter 5: “Income and expenditure accounts,” sections 5.1 and 5.2.2.3 — nominal GDP, price-volume decomposition and inventory capital gains in the revaluation account.
5. Central Statistics Office, Ireland, “Adjustment for Stock Appreciation” — separating price changes from physical stock changes, including the treatment of holding losses.
6. Roy Luck, “Enbridge tank farm, Cushing Oklahoma,” April 25, 2010, Wikimedia Commons — photograph and provenance, CC BY 2.0.