Anonymised, illustrative composite. An Alberta mechanical-contracting acquisition closed in the middle of the target’s fiscal year, and nobody had put a stub-year tax return on the closing checklist. The change of control did it automatically, the day the deal closed.
At a glance
A national mechanical-services group agreed to buy 100% of the shares of an Alberta commercial HVAC and mechanical contractor for $5,800,000. The target had always filed on a calendar year, January 1 to December 31, and its finance team had built the year’s budget, CCA schedule and small-business-deduction planning on that basis. Closing landed on September 22, chosen for ordinary commercial reasons — financing timing on the buyer’s side, nothing to do with tax.
Nobody on either deal team had put a stub-year corporate tax filing on the closing checklist, because nobody had a reason to think one was coming. The Income Tax Act does not ask permission. Section 251.2(2)(a) provides that “a taxpayer is at any time subject to a loss restriction event if (a) the taxpayer is a corporation and at that time control of the corporation is acquired by a person or group of persons.” An ordinary share purchase of 100% of a company’s stock is exactly that.
And a loss restriction event carries a mechanical, non-optional consequence under s.249(4)(a): “subject to paragraph (b), the taxpayer’s taxation year that would, but for this paragraph, have included that time is deemed to end immediately before that time, a new taxation year of the taxpayer is deemed to begin at that time.” The target’s December 31 year-end simply did not happen this year. It ended September 21, at 11:59 p.m., by operation of the Act, whether or not anyone had planned for it.
The stub year ran 264 days (January 1 to September 21) against a normal 365-day year — 72.3% of a full year. Two deduction limits that both the buyer’s and the target’s own pre-deal budgets had modelled on a full year were cut to that same fraction, mechanically, with no election available to avoid it.
Two provisions apply the same day-count logic to two different numbers. On the small business deduction, s.125(5)(b) provides that “where a Canadian-controlled private corporation has a taxation year that is less than 51 weeks, its business limit for the year is that proportion of its business limit for the year determined without reference to this paragraph that the number of days in the year is of 365.” The usual $500,000 limit was cut to $500,000 × (264/365) ≈ $361,200 for the stub year — active business income above that in the short year was taxed at the general corporate rate, not the preferential small-business rate the target had always planned around.
Capital cost allowance took the identical proration, from a different provision. Income Tax Regulations s.1100(3) provides that “where a taxation year is less than 12 months, the amount allowed as a deduction under this section…shall not exceed that proportion of the maximum amount otherwise allowable that the number of days in the taxation year is of 365.” The full-year CCA claim the target had budgeted on its equipment pool was cut to the same 72.3%, whether or not the equipment had been used for the full stretch of a normal year.
Read the unit. Neither of these is discretionary, and neither is triggered by anything the parties did wrong — the stub year is a direct, automatic consequence of the change of control itself. And the filing clock moved with it: s.150(1)(a) still gives a corporation the same “six months after the end of the year” to file, but because the year itself ended nine weeks early, the effective calendar filing deadline came nine weeks earlier than the target’s finance team had pencilled in.
The parties treated it as a closing-mechanics item rather than a dispute: the seller’s outside accountant was retained post-closing, at the seller’s cost under the transition services agreement, specifically to prepare and file the stub-year return within the accelerated deadline, and the buyer’s own tax provision for the year was rebuilt using the prorated $361,200 business limit and the prorated CCA claim rather than the full-year figures the original model had used. No price adjustment was needed — the mechanic affects timing and deduction sizing, not value, once it is correctly modelled.
Missing the accelerated filing deadline exposes the corporation to late-filing penalties on the stub-year return regardless of whether any tax was ultimately owing, and a tax provision built on a full 365-day year overstates both the small business deduction and the CCA claim actually available — an error that would only surface when the real return was prepared, by which point the buyer’s first post-closing financial statements would already be wrong.
There was no tell in the diligence sense — nothing to find, no representation that was technically true and practically misleading. The gap was procedural: a standard closing checklist built around representations, indemnities and third-party consents had no line item for confirm the tax year-end implications of the closing date, because the mechanic is not a defect in the target, it is a feature of every change-of-control closing.
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