How to Use Revenu Québec’s “Mon Dossier” to File QST Returns

Introduction

Filing your QST (Quebec Sales Tax) returns online through Revenu Québec’s Mon dossier pour les entreprises is the fastest, safest, and most efficient way to stay compliant. It allows you to submit returns, make payments, and view account balances instantly — all from one secure portal.

This practical guide from Mackisen CPA Montreal walks you through every step of using Mon dossier to file your QST returns, avoid errors, and maintain complete compliance with Revenu Québec.

Legal and Regulatory Framework

The Quebec Sales Tax Act (R.S.Q., c. T-0.1) requires every QST-registered business to collect, remit, and report taxes on all taxable supplies made in Quebec.

Revenu Québec administers both GST and QST for most Quebec businesses, meaning you can file both taxes through the same Mon dossier platform.

You must file even if:

• You had no taxable sales (nil return).

• You have outstanding balances from previous periods.

• You are a seasonal or part-time business.

Filing Deadlines

• Monthly filers: due the last day of the following month.

• Quarterly filers: due one month after the quarter end.

• Annual filers: due three months after fiscal year-end.

Failure to file on time results in penalties and daily interest under the Tax Administration Act (RLRQ, c. A-6.002).

Learning Insight

Even when your business has no sales, Revenu Québec’s system automatically flags missing returns as “late” — so filing nil returns is essential for maintaining good standing.

Step-by-Step: How to File a QST Return Through Mon dossier

Step 1 — Log In

Visit revenuquebec→ Mon dossier pour les entreprises.
Log in with your clicSÉQUR user ID and password.
If you haven’t registered yet, follow the online instructions to create a secure access.

Step 2 — Select “Consumption Taxes”

Once logged in, go to the Consumption Taxes section.
You will see accounts for:

• TVQ (QST)

• TPS (GST) if you’re also registered federally.

Select TVQ to begin filing your QST return.

Step 3 — Choose the Filing Period

You’ll see a list of open or pending filing periods.
Click on the one you want to file.
Verify the start and end dates match your accounting records.

If the period is missing or incorrect, contact Revenu Québec to correct your account setup before filing.

Step 4 — Complete the Return Form

The system will prompt you for:

• Total taxable sales for the period.

• QST collected from customers.

• Input Tax Refunds (ITRs) for eligible business purchases.

• Net QST owing or refund due.

If you had no activity, select the option to file a nil return.

Step 5 — Review and Submit

Before submitting, compare the figures with your accounting reports or reconciliation worksheet.
Once satisfied, click Submit.
A confirmation number will appear — download and save the PDF or take a screenshot as proof of filing.

Step 6 — Make Your Payment

After filing, pay your QST balance through one of the following options:

• Online banking: add Revenu Québec – TVQ as a payee.

• Pre-authorized debit: authorize payment directly from your Mon dossier account.

• My Payment (CRA): for federal or combined remittances.

Record the payment confirmation in your accounting system.

Learning Insight

Revenu Québec no longer mails paper confirmations. Your Mon dossier confirmation page and bank proof of payment are your official evidence of compliance.

Benefits of Using Mon dossier pour les entreprises

• 24/7 access to your QST and GST accounts.

• Faster refunds for eligible credits.

• Secure, encrypted communication with Revenu Québec.

• Automatic tracking of due dates and balances.

• Ability to delegate access to your CPA or bookkeeper.

Common Filing Errors to Avoid

• Submitting incorrect period dates.

• Forgetting to claim ITRs for eligible expenses.

• Using gross instead of taxable sales figures.

• Filing only QST and forgetting GST.

• Ignoring confirmation downloads.

Learning Insight

Revenu Québec’s audit algorithms cross-verify QST filings against GST, payroll, and income-tax data. Keeping consistent and accurate numbers across all accounts reduces your audit risk.

Real Quebec Business Example

A Quebec retailer filed all QST returns manually and often missed deadlines. After switching to Mon dossier, the business began filing early, received refunds faster, and maintained perfect compliance. Another business forgot to download filing confirmations, causing confusion during an audit.

Lesson: file online, save confirmations, and stay organized.

Compliance Checklist

Do

• File every QST return, even with no activity.

• Save all submission confirmations.

• Reconcile your accounting records before filing.

• Use Mon dossier for both GST and QST filing.

• Grant your CPA access to monitor submissions.

Don’t

• Wait until the deadline to file.

• Ignore payment confirmation emails.

• Mix business and personal transactions.

• Assume your accountant filed unless confirmed in writing.

Mackisen Strategy

At Mackisen CPA Montreal, we help clients file through Mon dossier accurately and on time by:

1. Setting up access credentials and delegated CPA authorization.

2. Reconciling GST/QST balances before every filing.

3. Reviewing Input Tax Refund claims for accuracy.

4. Storing proof of filing and payment for six years.

Our CPA-supervised system ensures every submission is accurate, documented, and audit-ready.

Why Mackisen

With more than 35 years of combined CPA experience, Mackisen CPA Montreal helps businesses across Quebec stay compliant with QST and GST obligations. We specialize in tax filing, audit defense, and refund optimization — ensuring every business owner files confidently and correctly.