Workflow
How to line up GST, QST, and identity on a Quebec client invoice
Start with the supply type, place of supply, and registration, then set labels and rates, then build the subtotal, two tax lines or the allowed one-step pattern, the total, and the payment and due date. Match your quote, purchase order, and net 30 language when they exist so every document tells one story (Revenu Québec, 'Calculating the taxes').
1
Confirm the supply, place of supply, and whether the sale is QST- and GST-registered in your fact pattern
Use Revenu Québec, the Canada Revenue Agency, and your advisor when a supply is zero-rated, exempt, a financial service, real property, or a cross-border digital sale. A wrong guess at this step will break every number below it.
Tip: For services, the place of supply is often where the work is done or received, not only where the wire transfer lands. Map the test before you set the first draft rate.
2
Set the pre-tax subtotal, then 5% GST, then 9.975% QST on the allowed base, or a compliant one-step total
Revenu Québec states that, for a two-step register, you use 5% on the sale price, then 9.975% on the sale price, and, for a one-step register, you can use 14.975% on the sale price, and that 9.97% or 14.97% rounded labels only apply when the device cannot store three decimal places, while the official combined rate 14.975% must not appear on the attesting document as a substitute for clear GST and QST lines, per its calculator guidance.
Tip: Reconcile your POS, your GL, and your return so the same dollars flow to Revenu Québec in the right boxes, not a rounded shadow total from a different spreadsheet cell.
3
List legal name, address, and registration string that Revenu Québec and the file expect
Include the strings your registration notice gives you, in the form they expect, and the document control fields Revenu Québec and your clients need: invoice number, date, a plain description, and, when a third party pays, the right party name, because those fields support the buyer and any ITR and ITC claims they can make, subject to their own rules (see the input tax credit glossary entry in this hub).
Tip: A missing or mistyped QST or GST registration string is a common first reason for a rejected line in a large buy-side AP queue.
4
Tie the total to the payment and due line your contract uses
If you promise net 30, the due line should be clear from a defined start, such as the invoice date. If the quote used a different trigger, the invoice should say the trigger you both accepted or point back to the signed quote.
Tip: A footnote is fine if the footnote and the number box agree, not if they point in two different directions on the start date.
5
File, pay, and keep books for the right retention, with electronic filing when the law or notice requires it on your account
Revenu Québec and the CRA can move filing and payment to mandatory electronic channels, with specific penalties the notices describe. Keep a calendar that is earlier than the hard stop you remember from last year, because a rule can change, as the CRA and Revenu Québec have both posted for e-filing moves in the past few years in other programs.
Tip: Set two reminders, one for preparation and one for the payment, so a bank cut-off time does not turn a same-day file into a late one.