Fees, Cost Drivers and 2026 Rules
Running a corporation in Quebec: accounting and tax differences that affect your fees
The CO-17 return, GST and QST administered by Revenu Québec, RL slips, the annual updating declaration and other Quebec rules that add accounting work.
A corporation operating in Quebec has more filings than one in most other provinces, and its accounting fee usually reflects that. On top of the federal T2, it files a Quebec corporation income tax return (CO-17) with Revenu Québec; it generally reports both GST and QST to Revenu Québec rather than to the CRA; it issues RL slips alongside federal T4 and T5 slips; and it files an annual updating declaration with the Registraire des entreprises du Québec. None of this is difficult for a firm that works in Quebec every day, but it is extra work, so quotes from Quebec firms and firms elsewhere are not directly comparable.
This guide is part of the corporate accountant fees overview. Figures are illustrative. Revenu Québec's French-language pages are the reference versions; English summaries are available for most topics.
Federal and Quebec filings side by side
| Obligation | Federal (CRA) | Quebec |
|---|---|---|
| Corporate income tax return | T2 | CO-17 with Revenu Québec |
| Sales tax | GST (5%), administered for Quebec businesses by Revenu Québec in most cases | QST (9.975%), Revenu Québec |
| Employment slips | T4 | RL-1 |
| Investment income slips (dividends) | T5 | RL-3 |
| Payroll contributions | CPP is replaced by QPP; EI at a reduced rate because of QPIP | QPP, QPIP, Health Services Fund, CNESST and, above thresholds, workforce training obligations |
| Corporate registry | Corporations Canada annual return if federally incorporated | Annual updating declaration with the Registraire des entreprises |
| Representative authorization | Represent a Client (CRA) | Separate authorization with Revenu Québec |
Why Quebec work takes more hours
- Two income tax returns. The CO-17 follows its own schedules and its own rules for some deductions and credits. Quebec's small business deduction has its own conditions, including tests related to hours worked by employees in some cases. The accountant must prepare and reconcile both returns.
- Two sales taxes on every transaction. Bookkeeping must code GST and QST separately, and supplier invoices need both registration numbers to support input tax credits (GST) and input tax refunds (QST).
- Payroll differences. QPP, QPIP and the Health Services Fund contributions require Quebec-specific payroll set-up and RL-1 slips.
- Language. Much correspondence from Revenu Québec is in French; a firm comfortable in both languages saves time.
- Sector rules. Restaurants, bars and some other sectors must use sales recording systems that meet Revenu Québec requirements, and construction has its own reporting obligations. These affect how sales data can be automated.
Illustrative fee comparison
Take two otherwise identical service corporations with one shareholder-employee, quarterly sales tax filing and a compilation:
| Task | Ontario corporation | Quebec corporation |
|---|---|---|
| Year-end compilation | 7 h | 7 h |
| T2 (Ontario tax is calculated on schedules in the T2) | 3 h | 3 h |
| CO-17 | 0 h | 2.5 h |
| Sales tax returns, 4 a year | 4 h (HST) | 5 h (GST and QST) |
| Slips (T4/T5, plus RL-1/RL-3 in Quebec) | 1 h | 2 h |
| Total | 15 h | 19.5 h |
At an illustrative $140 an hour, that is 15 x $140 = $2,100 versus 19.5 x $140 = $2,730, a difference of $630 driven only by the extra filings. Hours are assumptions for illustration; your firm's estimate may differ. Rerun it in the fee estimator.
The annual updating declaration
Corporations registered in Quebec, including federal corporations doing business there, must generally file an annual updating declaration with the Registraire des entreprises to keep their information current, within the period the Registraire specifies. Some accountants file it as part of the year-end package and some do not; it is a small task, but missing it can lead to penalties and, if neglected for long enough, to the registration being struck off. Check who is responsible in your engagement letter.
Sales tax administration in Quebec
For most businesses located in Quebec, Revenu Québec administers the GST/HST on behalf of the federal government as well as the QST. In practice that means one point of contact for both sales taxes, but separate returns or a combined return through Revenu Québec's online services, and audits of both taxes by Revenu Québec. Certain businesses, such as some large financial institutions, have different arrangements. See the GST/HST and QST workload guide for frequency and workload.
Choosing an accountant for a Quebec corporation
- Check membership in the Ordre des CPA du Québec and whether the firm is authorized for the engagement you need.
- Ask for experience with your sector's Quebec-specific rules.
- Confirm that the quote includes the CO-17, RL slips and the annual updating declaration, or price them separately.
- Ask how the firm communicates with Revenu Québec and whether it will handle correspondence in French.
- Use the accountant selection checklist.
Common Quebec-specific mistakes
- Claiming input tax refunds on invoices that show no QST number.
- Using an out-of-province payroll set-up that applies CPP instead of QPP.
- Forgetting RL-3 slips when dividends are paid.
- Ignoring the annual updating declaration because the federal annual return was filed.
- Connecting point-of-sale data to accounting software without checking sector rules.
When to consult a professional
Consult a Quebec CPA before moving a corporation into or out of Quebec, setting up payroll for the first time, or answering a Revenu Québec audit letter. Rules for the Quebec small business deduction and payroll contributions are detailed and change from year to year.
Quebec filings also add to the corporate return work described in T2 preparation cost, and the extra dates are in the 2026 filing calendar.
Frequently asked questions
Does a federal corporation operating in Quebec still file the CO-17?
Generally yes, if it has an establishment in Quebec. Being incorporated federally does not remove provincial tax filing.
Can a firm outside Quebec prepare the CO-17?
Yes, many can, but confirm experience and that their software handles the CO-17 and RL slips.
Is QST charged on accounting fees?
Yes, accounting services supplied in Quebec are generally subject to GST and QST. A registered corporation can usually recover them.
Sources
- Revenu Québec — CO-17, QST, GST administration in Quebec, RL slips and sales recording rules
- Government of Québec (Registraire des entreprises) — the annual updating declaration
- Ordre des CPA du Québec — the regulator of CPAs in Quebec
- Canada Revenue Agency — the federal T2
