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Working Capital Adjustment (WCA) — A working capital adjustment (WCA) is a comparability adjustment for material differences in trade receivables, inventory and trade payables between a tested party and comparable companies.
A working capital adjustment (WCA) is a comparability adjustment for material differences in trade receivables, inventory and trade payables between a tested party and comparable companies. It translates those differences into an estimated financing effect before the comparable results are interpreted.
For an operating-margin analysis, the base is commonly sales. The adjustment is normally calculated for each comparable using a rate and period consistent with the working-capital exposure, after which the arm's-length range is recalculated.
The OECD Transfer Pricing Guidelines state in paragraphs 3.48–3.50 that comparability adjustments should be considered only when they are expected to improve the reliability of the results. The Annex to Chapter III provides a working-capital example; it is an illustration, not a mandatory formula for every case.
A WCA is most useful when:
The sign depends on the formula and on whether comparables or the tested party are being adjusted. State the convention explicitly and test the calculation independently. A direction label is safer than relying on a memorized “add” or “subtract” rule.
Assume the tested party has trade working capital equal to 20% of sales and a comparable has 12%. The eight-percentage-point difference is multiplied by a documented short-term rate of 4%:
That 0.32-point financing effect is then applied using the documented direction convention. The comparable's adjusted indicator is included in the range only after the same approach has been applied consistently to the full set.