Ask most Toronto-area owner-managers how their corporation's annual government filings work, and the answer usually starts and ends with the T2. That used to be close enough. Until 2021, Ontario's Corporations Information Act (CIA) Annual Return rode along as a schedule attached to the federal T2 return, so if your accountant filed your corporate tax return, the provincial registry filing came with it automatically. That bundling ended more than four years ago, and the annual return is now a completely separate filing, made directly with the Ontario Business Registry (OBR) — not with the Canada Revenue Agency, and not as part of your T2 package. A growing number of established corporations are still operating on the old assumption, and the Ministry's enforcement of the requirement has tightened, not loosened, since the split. This is worth a five-minute check before the corporations that skipped a year or two find out the hard way.
What changed, and when
On May 15, 2021, the CRA stopped accepting the CIA Annual Return as part of the T2 filing process. On October 19, 2021, the province launched the Ontario Business Registry, and every Ontario corporation — along with every extra-provincial corporation licensed to carry on business in Ontario — has been required to file its Annual Return directly through the OBR ever since. If your accounting firm's engagement letter or workflow was built around the old CRA-bundled process and hasn't been updated, there's a real chance this filing has quietly fallen off the checklist for one or more fiscal years.
Source: Government of Ontario — Annual return filing (Corporations Information Act).
The deadline runs off your fiscal year-end, not the calendar
The Annual Return is due within six months of your corporation's tax year-end — the same fiscal year-end that governs your T2 deadline, not January 1 or the anniversary of incorporation. A Toronto corporation with a December 31 year-end has until June 30 to file; a March 31 year-end has until September 30. Because the return isn't tied to the T2 filing date anymore, it's easy for the two deadlines to drift apart on your internal calendar even though they're calculated the same way. There is currently no government fee to file the Annual Return through the OBR, so cost isn't the barrier — awareness and process are.
Source: Government of Ontario — Corporations Information Act annual return, questions and answers.
You need a Company Key to file — and older corporations have to request one
Filing through the OBR requires a Company Key: a unique identifier tied to your specific corporation, used together with a personal ONe-key account to access and submit the filing online. Corporations incorporated, continued, or registered in Ontario on or after October 19, 2021 were issued a Company Key automatically as part of that registration. If your corporation predates that launch, nobody assigned you one — you have to request it yourself through the OBR, and it's mailed to the corporation's registered office address (or, in some cases, delivered by email if your registered contact information supports it), typically taking about a week to arrive. If you've never gone looking for your Company Key, it's worth confirming now rather than discovering the gap when a filing deadline is already close.
Source: Government of Ontario — Ontario Business Registry, all services.
What the return actually asks for
The Annual Return confirms and updates the government's record of your corporation: legal name, Ontario Corporation Number, registered office address, the date of incorporation or amalgamation, and current directors and officers. Since the move to the OBR, the form also collects information that the old CRA-bundled version didn't require, including a North American Industry Classification System (NAICS) code describing your principal business activity and an official corporate email address the government can use to reach you. None of this is difficult to complete once you're in the system, but it does mean the return is a genuine information-verification exercise, not a formality you can rubber-stamp from last year's copy.
Source: Government of Ontario — Annual return filing (Corporations Information Act).
Why this is more than paperwork: involuntary dissolution
Failing to file the Annual Return is one of several grounds on which the Ministry can move to dissolve a corporation involuntarily under the Business Corporations Act — the same enforcement mechanism used for defaults under the Corporations Tax Act and the Employer Health Tax Act. In practice, the Ministry sends notice of the default, or publishes notice of its intent to dissolve in The Ontario Gazette, and the corporation has 90 days to remedy the default before dissolution proceeds. A dissolved corporation loses its legal existence: it can no longer hold property or enter contracts as itself, its right to maintain or defend a court proceeding is suspended (barring leave of the court), and directors can face personal exposure for the corporation's remaining obligations. Reviving a dissolved corporation is possible, but it's a separate filing and fee, and it doesn't undo the operational disruption — frozen bank accounts, lapsed insurance eligibility, and counterparties who won't deal with an entity that isn't in good standing — while the corporation was dissolved.
Source: Government of Ontario — Involuntary corporate dissolution.
A compliance check for Toronto-area corporations this quarter
- Confirm your Company Key exists and is accessible. If your corporation was registered before October 19, 2021 and nobody on your team has ever logged into the OBR, request the key now rather than the week your filing is due.
- Check your actual filing history against your fiscal year-ends, not against your T2 filing confirmations. A filed T2 no longer tells you anything about whether the Annual Return went in.
- Update your official email address and NAICS code if either has changed — this is also where the government sends default notices, so a stale email address is its own risk.
- If your corporate structure changed this year — a new subsidiary, a change in directors, an amalgamation — make sure the next Annual Return reflects it; the return exists specifically to keep this information current.
- Don't wait for a Notice of Default to test the process. If you're unsure whether a prior year's return was filed, verify it through the OBR directly rather than assuming.
Where this fits with your other 2026 filings
This sits alongside, not instead of, the T2 filing rhythm we've covered for Toronto-area corporations this year — the same six-month clock governs both, they just run through completely different systems now. See our Ontario corporate tax guide for the T2 side of the calendar, and our earlier look at the T2 filing deadline for December year-ends for how the two six-month windows line up in practice.
Key takeaways
- Ontario's CIA Annual Return has been filed separately from the T2, directly through the Ontario Business Registry, since October 19, 2021 — the CRA stopped accepting it as a T2 schedule on May 15, 2021.
- The deadline is six months after your corporation's fiscal year-end, the same clock as your T2 but tracked in a different system.
- Filing requires a Company Key, issued automatically to corporations registered after October 19, 2021 but requiring a separate request — and roughly a week's wait — for older corporations.
- The return now collects a NAICS code and official email address in addition to the usual corporate and director information.
- Missing the filing is grounds for a Notice of Default and, after a 90-day remedy period, involuntary dissolution — a status that suspends the corporation's legal existence and its right to sue or be sued without leave.
If your Toronto-area corporation hasn't confirmed its Ontario Business Registry filing history recently, or you're not sure whether your Company Key is on file, RN Canada can walk through your compliance calendar — Annual Return, T2, and the rest of the statutory filing stack — alongside your regular accounting work.