Subsection 249(3.1) of the Income Tax Act forces a corporation’s taxation year to end the moment before it becomes, or stops being, a Canadian-controlled private corporation. A new taxation year begins at that same moment. The section 249(3.1) deemed year-end splits what you expected to be one fiscal year into two, each taxed under the rules that match your CCPC status during that period. It applies only when the status change happens for a reason other than an acquisition of control; acquisitions of control are handled under subsection 249(4) instead.
What Triggers the Deemed Year-End
The rule fires whenever a corporation crosses into or out of the CCPC definition in section 125(7) for a reason unrelated to who controls it. A corporation is not a CCPC if non-residents or public corporations control it (directly, indirectly, or on a deemed aggregated basis), if a class of its shares is listed on a designated stock exchange, or if it has elected under subsection 89(11) to be treated as a non-CCPC.1Justice Laws Website. Income Tax Act – Section 125
The most common real-world trigger is an initial public offering. Listing shares on a designated stock exchange takes the corporation outside the CCPC definition instantly.2Canada.ca. Designated Stock Exchanges The reverse also happens: if Canadian residents acquire enough voting power over a foreign-controlled corporation to bring it inside the CCPC definition, that too triggers subsection 249(3.1). Filing or revoking the 89(11) election is another path.
The reason this matters is that CCPC status governs access to the small business deduction, refundable treatment on investment income, and whether earnings feed the General Rate Income Pool or the Low Rate Income Pool. The deemed year-end draws a clean line so the right rules apply to each side of it.
How the Year Gets Split
Paragraph 249(3.1)(a) deems the existing taxation year to end immediately before the status change. Paragraph (b) deems a new taxation year to begin at that exact moment.3Justice Laws Website. Income Tax Act – Section 249 You now have two taxation years where you planned for one.
The Seven-Day Election
Paragraph 249(3.1)(c) lets you avoid a pointless stub of a few days. If your prior taxation year would have ended naturally within the seven days before the status change, you can elect to extend that prior year so it ends immediately before the status change instead. The election is filed with the return for that taxation year, and it is only available if no other status change or acquisition of control occurred during the same seven-day window.
Picking a New Fiscal Year-End
The new taxation year that begins at the moment of the status change can run to whatever fiscal year-end you choose, provided it does not exceed 53 weeks (371 days) from the start date.4Canada Revenue Agency. Determining Your Corporation’s Tax Year Use that flexibility to align the new cycle with the business as it now looks.
Filing and Payment for the Short Year
The short year is a full taxation year for CRA purposes. File a T2 within six months of the deemed year-end date.5Canada Revenue Agency. When to File Your Corporation Income Tax Return A late return costs 5% of the unpaid tax plus 1% for each full month it stays unfiled, capped at 12 months, with steeper rates for repeat late filers.
The tax balance is due earlier than the return. Most corporations pay within two months of the year-end. A CCPC that claimed the small business deduction, and whose taxable income including associated corporations did not exceed the business limit for the prior year, gets three months instead.6Canada Revenue Agency. Due Dates for Payments – Corporation Income Tax That three-month window only holds while the corporation is a CCPC throughout the year, so a corporation that lost CCPC status mid-year is back to the two-month deadline for the post-change period.
Overdue balances accrue interest at the CRA’s prescribed rate, compounded daily. For the second quarter of 2026 that rate is 7%.7Canada Revenue Agency. Interest Rates for the Second Calendar Quarter
Instalments in a Short Year
If the short year is under a month, no instalments are required for it. For longer short years, the CRA scales the prior year’s tax up to a 12-month equivalent (the “adjusted base”) by dividing 365 by the days in the short year and multiplying by the actual tax payable. Where the short year runs less than 183 days, the CRA uses the greater of that adjusted base and the adjusted base for the most recent prior year longer than 182 days.8Canada Revenue Agency. Situations That May Affect Your Instalment Calculations
Deductions and Limits Shrink
Several thresholds prorate down when the taxation year is shorter than 365 days. The formula is the same in each case: full-year amount times days in the short year divided by 365.
Small Business Deduction
The $500,000 federal business limit is reduced proportionally whenever a CCPC’s taxation year is less than 51 weeks, under paragraph 125(5)(b).1Justice Laws Website. Income Tax Act – Section 125 A 182-day short year cuts the available business limit to roughly $249,315. Only active business income earned during the short period, up to that reduced ceiling, gets the small business rate.
Capital Cost Allowance
CCA is prorated the same way. A corporation that would have claimed $4,000 in CCA over a full year gets about $2,000 in a six-month short year.
Carryforwards Lose a Year
This is the quiet cost of a deemed year-end. Non-capital losses carry forward for 20 taxation years and back for 3.9Justice Laws Website. Income Tax Act – Section 111 Every deemed year-end counts as one of those 20, no matter how short the period actually was. Investment tax credits, including SR&ED credits, follow the same 20-year clock and burn a year the same way.10Canada Revenue Agency. SR&ED Investment Tax Credit Policy
If your corporation carries significant loss or credit pools, model the remaining runway right after a status change. Where losses are close to expiry and the short year didn’t generate enough income to absorb them, accelerating income into the next full year (or deferring deductions) is worth working through with a tax advisor.
Dividend Accounts After the Change
Losing CCPC status reshapes how the corporation’s dividend pools work.
A CCPC builds a General Rate Income Pool, which supports eligible dividends taxed at the lower rate in shareholders’ hands. Once the corporation is no longer a CCPC, it stops adding to GRIP and starts accumulating in a Low Rate Income Pool. In the first year after the change, any remaining GRIP balance can offset an opening LRIP balance; after that, GRIP is effectively frozen.
The Refundable Dividend Tax on Hand balance survives the change, but no further RDTOH accumulates. That shifts the effective tax cost of investment income going forward: a CCPC pays a high refundable rate that comes back when dividends are paid, while a non-CCPC pays a lower non-refundable rate with no dividend refund.
Watch the GRIP balance closely around the transition. Any eligible dividend designated in excess of GRIP triggers a 20% penalty tax under Part III.1.11Justice Laws Website. Income Tax Act – Section 185.1 The stub-period GRIP figure often lands lower than management assumes, so dividend declarations near the change date need to be sized against the actual balance at that moment.
249(3.1) Compared With 249(4)
Both provisions create deemed year-ends, but they respond to different events. Subsection 249(3.1) handles CCPC status changes that don’t involve an acquisition of control. Subsection 249(4) handles loss restriction events, which usually means someone acquires control of the corporation.3Justice Laws Website. Income Tax Act – Section 249
The consequences diverge on losses. An acquisition of control under 249(4) generally wipes out pre-acquisition net capital losses and restricts non-capital losses to income from the same or a similar business. Section 249(3.1) does none of that. Losses survive intact; they just have one fewer year on the carryforward clock. Both provisions include a seven-day election to prevent a very short stub, and the statute carves 249(3.1) out of 249(4), so a single event cannot trigger both at once. Where a transaction involves both an acquisition of control and a CCPC status change, 249(4) governs.