How to Use Revenue Québec’s “Mon Dossier” to File QST Returns — Montreal CPA Firm

Mon Dossier pour les entreprises is Québec official online platform for managing QST Accounts. It is where you file returns, pay balances, access notices, correct information, and respond to audit requests. But many business owners struggle with navigating the portal, leading to missed filings, incorrect submissions, and refund delays. This guide explains how to use Mon Dossier effectively with the same precision Mackisen applies when managing QST filings for clients.

Why Mon Dossier Matters
It is the only portal where you can file QST returns, view your account status, check refund progress, submit documents, and communicate with Revenue Québec. Filing outside the portal (e.g., by paper) delays processing and increases audit chances.

Legal and Regulatory Framework
FPZ-500-V filings are governed by the Tax Administration Act. RQ requires electronic filing for most businesses. Hickman Motors (1997) and Lac d’Amiante (2001) confirm strict compliance and documentation requirements.

What Happens When You Don’t Use Mon Dossier Properly
Imagine submitting a QST return manually without checking Mon Dossier. Two months later, you discover a message: “Votre remboursement est en attente d’information.” Your refund is frozen because RQ requested documents through the portal — but you never saw it. Deadlines pass. Interest accumulates. Your file is flagged. Using Mon Dossier correctly prevents silent refund freezes and unexpected compliance issues.

Learning Section: Features You Must Know
Filing FPZ-500-V returns
Viewing balances
Downloading filing confirmations
Responding to Requests for Information
Submitting supporting documents
Updating business details
Setting up direct deposit
Monitoring refund processing

SEO Learning: Primary and Secondary Keywords
Primary: Mon Dossier QST filing, Revenue Québec QST return online, QST FPZ-500-V filing guide Montreal.
Secondary: Quebec business portal, QST refund tracking, Quebec online tax account.

Step-by-Step: How to File QST in Mon Dossier
Step 1: Log in using your clicSÉQUR credentials.
Step 2: Select your QST account.
Step 3: Choose “File a FPZ-500-V Return.”
Step 4: Enter total sales.
Step 5: Enter QST collected.
Step 6: Enter Input Tax Refunds (ITRs).
Step 7: Enter adjustments.
Step 8: Review and submit.
Step 9: Download and save your confirmation.

Documentation Section: What You Must Keep
Filing confirmations
Portal screenshots
All correspondence from RQ
Uploaded documents
Reconciliation reports
Invoices, receipts, proof of payment

Common Mistakes
Ignoring messages in Mon Dossier
Failing to download confirmations
Submitting ITRs without documentation
Incorrect period selection
Not reconciling accounts before filing

Winning With Revenue Québec and Canada
Mackisen ensures your QST filings are accurate, submitted early, and backed by complete documentation. We monitor your Mon Dossier account daily, respond to requests immediately, and manage every step of the process so your refunds are never delayed.

Mackisen Service Hub
We handle portal setup, return filings, documentation uploads, refund tracking, and audit responses directly through Mon Dossier.

Why Mackisen
Mackisen CPA Montreal provides the highest level of QST compliance proficiency, ensuring accuracy, speed, and protection from audit exposure.