Capitalisation of post commissioning interest disallowed, so such interest cannot support investment allowance or depreciation.

Interest attributable to the period after installation and commencement of production may not be capitalised; amounts capitalised for such post commissioning interest, including future interest, do not qualify for investment allowance or depreciation. An earlier Board instruction misstated the statutory effective year by oversight; that reference is corrected to reflect the statute's actual commencement date, and officers should note the clarification.

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