Guides
How Alberta, Quebec and Ontario tax filing rules differ for Canadian preparers
A comparison of Alberta, Quebec and Ontario tax filing rules for preparers, covering separate returns, filing channels, corporate due dates and balance due dates.
What to take away
- Alberta has no separate personal return; its corporate AT1 is filed with Alberta Tax and Revenue Administration, in addition to the federal T2 corporation return filed with the CRA.
- Quebec requires separate personal and corporate returns to Revenu Québec on top of the federal T1 and T2, while personal filing dates still match federal April 30 and June 15.
- Ontario personal and corporate tax are both collected by the CRA, which keeps deadlines aligned with federal T1 and T2 rules.
- The largest gaps for multi-province practices are Quebec's separate filing stream and Alberta's corporate-only separate stream.
- None of these provinces changes the underlying taxation year end; preparers still need current-year provincial bulletins.
Provincial tax deadline differences Canada preparers need to compare fall into three groups: Alberta, Quebec, and Ontario. These provinces differ more on corporate filing channels than on personal filing dates. A preparer who tracks only federal dates will miss Quebec's separate Revenu Québec deadlines and Alberta's AT1 corporate due date.
What is being compared
Alberta, Quebec, and Ontario are compared because they are large markets and their filing channels differ. Alberta and Ontario share a federal personal filing flow, but Alberta keeps corporate tax separate. Quebec adds its own personal and corporate returns to the federal returns filed with the CRA. The CRA administers provincial corporation tax for every province and territory except Quebec and Alberta, and corporations in those two still pay federal income tax as well as provincial tax.
A preparer who calendars only CRA dates will miss Quebec's separate Revenu Québec deadlines and Alberta's AT1 corporate due date. The same pattern appears in the CRA EFILE registration deadline article: registration steps must be cleared before filing windows open.
The criteria that matter
For a multi-province practice, the comparison turns on five questions: separate return required, personal filing deadline, self-employed filing deadline, corporate return due date, and corporate balance-due date. The administering body also matters because payment and e-file channels differ.
Applying Criteria to a Client
- Identify province of residence or permanent establishment
- Check if separate return is required
- Compare payment due date with filing date
- Set calendar reminders for deadlines
Provincial Tax Criteria Compared
Alberta
- Separate personal return
- No
- Personal filing deadline
- April 30
- Self-employed filing deadline
- June 15
- Corporate return due
- 6 months after FYE
- Corporate balance due
- 2 or 3 months
- Administering body
- CRA / Alberta TRA
Quebec
- Separate personal return
- Yes
- Personal filing deadline
- April 30
- Self-employed filing deadline
- June 15
- Corporate return due
- 6 months after FYE
- Corporate balance due
- 2 or 3 months
- Administering body
- Revenu Québec
Ontario
- Separate personal return
- No
- Personal filing deadline
- April 30
- Self-employed filing deadline
- June 15
- Corporate return due
- 6 months after FYE
- Corporate balance due
- 2 or 3 months
- Administering body
- CRA
Alberta
- Separate personal return
- No
- Personal filing deadline
- April 30
- Self-employed filing deadline
- June 15
- Personal balance due
- April 30
- Corporate return due
- Six months after fiscal year end
- Corporate balance due
- Two months after year end; three months for eligible small CCPCs
- Administering body
- CRA for personal; Alberta Tax and Revenue Administration for corporate
Quebec
- Separate personal return
- Yes
- Personal filing deadline
- April 30
- Self-employed filing deadline
- June 15
- Personal balance due
- April 30
- Corporate return due
- Six months after fiscal year end
- Corporate balance due
- Two months after year end; three months for eligible small CCPCs
- Administering body
- Revenu Québec for both
Ontario
- Separate personal return
- No
- Personal filing deadline
- April 30
- Self-employed filing deadline
- June 15
- Personal balance due
- April 30
- Corporate return due
- Six months after fiscal year end
- Corporate balance due
- Two months after year end; three months for eligible small CCPCs
- Administering body
- CRA for both
Apply these criteria to a client:
- Identify the province of residence for individuals or the province of permanent establishment for corporations.
- Check if that province requires a separate return.
- Compare payment due date with filing date.
- Set calendar reminders for both provincial and federal deadlines.
- Confirm e-file or paper file channels with the administering body.
Option by option
Alberta. Personal clients file one T1 with CRA, no separate Alberta return. Corporate clients file the federal T2 with the CRA and a separate AT1 with Alberta Tax and Revenue Administration, because Alberta, not the CRA, administers Alberta corporate tax. Corporate filing is due six months after fiscal year end, with balance due two months after year end, or three months for eligible small CCPCs. Preparers with Alberta corporate clients need a second filing channel.
Filing Channels by Province
Alberta
- Personal return
- T1 with CRA
- Corporate return
- AT1 with Alberta TRA
- E-file authorization
- CRA
Quebec
- Personal return
- T1 + TP-1
- Corporate return
- CO-17 with Revenu Québec
- E-file authorization
- Revenu Québec
Ontario
- Personal return
- T1 with CRA
- Corporate return
- T2 with CRA
- E-file authorization
- CRA
Quebec. Individuals file both a federal T1 and a Quebec TP-1 with Revenu Québec. Personal filing stays April 30, self-employed June 15, balance due April 30. Corporations file the federal T2 with the CRA and the CO-17 with Revenu Québec, due six months after year end, balance due two or three months. Quebec requires separate e-file authorization. Preparers still need the CRA EFILE registration deadline and requirements for federal clients.
Ontario. Personal and corporate tax flow through CRA. Ontario corporate tax is part of the T2 return with Ontario schedules. Filing due six months after year end, balance due two or three months. Personal dates match CRA. Fewer separate channels, but Ontario adds provincial surtaxes and health premium to the T1 calculation.
Where each one wins
Alberta is the right answer when a preparer's corporate clients operate only in Alberta and want a single provincial corporate return separate from CRA. Quebec is the right answer for a practice serving Quebec residents or Quebec corporations, because every Quebec client has a Revenu Québec return alongside the federal return filed with the CRA. Ontario is the right answer for multi-jurisdiction practices that want CRA-only filing for both personal and corporate clients, reducing the number of separate deadlines to track.
Choosing the Right Province
Corporate clients operate only in Alberta?
Alberta AT1 separate from CRA
Consider Quebec or Ontario
A firm that manages clients in all three provinces should use deadline tracking software to keep provincial and federal dates separate. The software can flag the separate Alberta AT1 and Quebec TP-1 forms before they become urgent.
The same tracking logic applies to Quebec's TP-1 and Ontario's T2 schedules. A missed provincial deadline can trigger interest even when the federal return is on time. Preparers should also compare the Alberta AT1 balance-due rule with federal T2 rules, because the same small business deduction may affect both.
What none of them solve
The comparison table does not replace a client-by-client review of residency and permanent establishment. A practice that serves Alberta and Quebec clients must still confirm the correct province for each return because a wrong province on an engagement letter changes which return is due. Preparers should also verify whether a corporation has a permanent establishment in more than one province, because that can trigger additional provincial allocations and deadlines.
A practice that compares these three provinces should also use a process that keeps service quality honest by checking that returns are filed under the right province. This check includes matching the client's permanent establishment to the Alberta AT1 or Quebec CO-17 requirement.
