Every spring, thousands of self-employed Quebecers sit down at their computers with the same question: why do I have to file two tax returns when my salaried colleagues only file one? The answer is both simple and frustrating. And if no one has ever explained it clearly to you, this guide is for you.
T1 and TP-1 — Why Two Returns?
Quebec is the only Canadian province that collects its own income tax independently from the federal government. In practice, your business income is taxed twice: once by Ottawa, and once by Quebec City.
- The T1 is the federal return, filed with the Canada Revenue Agency (CRA). Every Canadian files it, regardless of province. This is where you calculate your federal income tax.
- The TP-1 is the provincial return, filed with Revenu Québec. It exists only in Quebec. You use it to calculate your provincial tax according to the Quebec government's own rules and rates.
Both forms start from the same gross income, but the deduction rules, available credits, and tax rates differ between the two governments. As a result, you may owe very different amounts to the CRA and to Revenu Québec, even though your base income is identical.
T2125 and TP-80-V — Your Business Income Schedules
Your business income and expenses don't go directly into the T1 or the TP-1. They first flow through specialized schedules — and that's where the real bookkeeping happens.
T2125 — Statement of Business or Professional Activities (federal)
This is the federal schedule where you report your gross business income, then deduct your eligible business expenses to arrive at your net income. That net figure is then carried forward to your T1. The T2125 also contains the standardized CRA expense line numbers.
TP-80-V — Business or Professional Income and Expenses (provincial)
The Quebec equivalent of the T2125, filed alongside your TP-1. The structure is similar, but the line numbers and some deduction rules differ from the federal version. This form feeds your TP-1 the same way the T2125 feeds your T1.
The logical chain is: T2125 → T1 → CRA and TP-80-V → TP-1 → Revenu Québec. Same expense, two forms, two governments.
The Key Expense Lines to Know
The T2125 organizes your expenses into numbered categories. Here are the eleven lines that most self-employed persons use:
| Line | Expense Category |
|---|---|
| 8521 | Advertising |
| 8523 | Meals and entertainment |
| 8690 | Insurance |
| 8710 | Bank charges |
| 8810 | Office supplies |
| 8860 | Professional fees (accountant, lawyer, consultant) |
| 8910 | Rent (commercial workspace) |
| 9200 | Travel |
| 9220 | Telephone and internet |
| 9281 | Motor vehicle expenses |
| 9945 | Home office |
These line numbers are from the federal T2125. The provincial TP-80-V uses a different numbering system for the same categories — a good reason to use software or an accountant familiar with both systems.
A note on the home office deduction (line 9945): You can deduct a portion of your rent or housing costs if you regularly work from home. However, this deduction cannot create a net loss for your business — it can only reduce your business income to zero. Any unused balance carries forward to the following tax year.
2026 Deadlines You Cannot Miss
For the 2025 tax year, here are the four critical dates according to the CRA and Revenu Québec:
| Date | Obligation |
|---|---|
| April 30, 2026 | Federal tax payment due (T1) |
| April 30, 2026 | Provincial tax payment due (TP-1) |
| June 15, 2026 | T1 filing deadline (if you or your spouse have business income) |
| June 15, 2026 | TP-1 filing deadline (if you operate a business) |
The most common trap: The *filing* deadline is June 15, but the *payment* deadline remains April 30 for both governments. If you owe tax and don't pay by April 30, interest accrues — even if you file on time before June 15. In other words: estimate what you owe and pay by April 30, even if you haven't finished your forms yet.
Official Sources
All information in this article comes from official government sources:
- CRA — General Income Tax and Benefit Package : canada.ca/en/revenue-agency/services/forms-publications/tax-packages-years/general-income-tax-benefit-package.html
- Revenu Québec — TP-1 Return : revenuquebec.ca/en/online-services/forms-and-publications/current-details/tp-1/
- CRA — Report Business Income and Expenses (T2125) : canada.ca/en/revenue-agency/services/tax/businesses/topics/sole-proprietorships-partnerships/report-business-income-expenses.html
- Revenu Québec — TP-80-V Form : revenuquebec.ca/en/online-services/forms-and-publications/current-details/tp-80-v/
- CRA — Important Dates for Individuals : canada.ca/en/revenue-agency/services/tax/individuals/topics/important-dates-individuals.html
- Revenu Québec — Deadline for Filing Your Income Tax Return : revenuquebec.ca/en/citizens/income-tax-return/filing-your-income-tax-return/deadline-for-filing-your-income-tax-return/
If you're looking to never lose an expense between line 8521 and line 9281 again, Bvolt is built for that: scanning a receipt automatically identifies which T2125 category the expense belongs to and prepares an organized export for your accountant or your return. Less manual entry, fewer missed deductions. → Try Bvolt free at bvolt.ca
This article is for informational purposes only and does not constitute professional tax advice. Consult an accountant or tax professional for your specific situation.