GST and QST: How Do They Really Work?
- Notre équipe
- Dec 8, 2025
- 2 min read

"As a consumer, paying taxes hurts the wallet. But when you become an entrepreneur, your perspective needs to shift completely.Rule number one to understand: GST and QST are neither income nor an expense for your business.In reality, you become an agent for the government. Your role is simple: collect money on behalf of the State and remit it. In exchange, the government allows you not to pay taxes on your own business expenses. It is a balancing act that we will break down together."
1. The Current Rates (The Basic Math)
In Quebec, we juggle two taxes:
GST (Goods and Services Tax): This is the federal portion (Canada). Current rate: 5%.
QST (Quebec Sales Tax): This is the provincial portion. Current rate: 9.975%.
In total: You must add 14.975% to your sales invoices (often rounded to 15% in our heads, but accounting software uses the precise rate).
2. The Magic Mechanism: Collection vs. Expenses
This is where the magic happens. The system works based on the difference between the two.
A. What You Collect (Sales)
When you bill a client $100 + Tax ($14.98), you receive $114.98.
The $100 is yours (your revenue).
The $14.98 is not yours. You must set it aside for the government.
B. What You Pay (Expenses/Inputs)
To run your business, you buy a computer, pay rent, advertising, etc. You pay taxes on these purchases.
The government considers that businesses shouldn't have to bear the cost of these taxes.
Therefore, you will claim back the taxes you paid. These are called ITCs (Input Tax Credits - Federal) and ITRs (Input Tax Refunds - Quebec).
3. The Final Equation: The Tax Return
At the end of your reporting period (monthly, quarterly, or annually), you balance the books:
Taxes Collected (Sales) - Taxes Paid (Expenses) = Amount to Pay (or Receive)
Scenario 1 (Most Common): You collected more than you spent. You write a cheque for the difference to the government.
Scenario 2 (Start-ups or Heavy Investment): You spent more than you sold. The government sends you a cheque (a refund).
4. The Deadly Mistake to Avoid
The classic trap for new entrepreneurs is looking at their bank account, seeing a high balance, and spending it all.
Never forget: A portion of that money (roughly 15% of your sales) belongs to Revenu Québec/Canada.
Pro Tip: Open a separate savings account. Every time a client pays you, immediately transfer the tax amount (15%) to this account. When tax season arrives, the money is there, and you won’t be stressed.
Conclusion
"Managing GST/QST doesn't have to be a nightmare. It’s a simple exercise of 'money in' versus 'money out.' Once you are registered, make sure to keep all your expense receipts: every lost receipt is money (ITCs/ITRs) that you are donating for free to the government!"




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