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Ask an Expert · Inventory

Can changing an inventory costing method in the year of a sale distort reported earnings?

Nothing was missing from the warehouse and nothing was mispriced. The distortion existed only because two accounting bases met in the middle of one year.

Treadstone Associates · Updated 2026

Short answer

Yes — if a business changes how it costs its closing inventory (for example, beginning to absorb a share of production overhead into finished-goods and work-in-progress cost) in the same year it is being sold, the entire one-time uplift lands in that single year’s gross margin and cost of sales, and it will not repeat, even though nothing about the underlying business actually changed.

The rule

Income Tax Act s.10(2), “Continuation of valuation,” provides: “Notwithstanding subsection 10(1), for the purpose of computing income for a taxation year from a business, the inventory at the commencement of the year shall be valued at the same amount as the amount at which it was valued at the end of the preceding taxation year for the purpose of computing income for that preceding year.” That freezes OPENING inventory at last year’s closing value — it does not stop a company changing its CLOSING valuation basis mid-year, which is exactly the gap that lets a single year absorb the whole swing.

When this changes

Section 10(2.1), “Methods of valuation to be the same,” requires that a valuation method used at the end of one year continue into the following year “unless the taxpayer, with the concurrence of the Minister and on any terms and conditions that are specified by the Minister, adopts another method permitted under this section” — concurrence that a mid-diligence change of method will not have sought. Which accounting framework permits the change for financial-reporting purposes in the first place is a separate question, governed by the accounting standard the statements are prepared under, not by the Income Tax Act.

Where This Plays Out in the Case Files

See it decided in the inventory-method-changed case file, the two-frameworks-two-EBITDAs file and the seven-years-of-non-recurring add-back file.

Sources

Ask us to test whether your gross margin move is a real business change or an accounting one.

A 30-minute call is enough to tell you whether your numbers hold up.

The Canadian benchmark

What do businesses like this one actually sell for?

Canadian small-business transaction data is not published anywhere, so most valuations in this country quote an American benchmark. The Deavo–Treadstone Acquisition Index is a daily record of Canadian listings built to replace that: asking-price distributions by province and city are published now, and days on market, departure rates and asking-to-sale spreads follow as the series lengthens. Leave an email and we will tell you as each measure lands.

No pitch, no listings. One email when the first report lands.