Two taxes instead of one, a registration threshold that decides when you charge them, and the line almost everybody gets wrong on their first invoice.
Two taxes, two numbers
Four practical consequences of this two-tier system.
Two distinct registrations, with two numbers to show on your invoices.
Two calculations, applied to the same base but at different rates.
Two returns to produce, on a calendar that may be shared or separate.
And two remittances, whose amounts do not offset each other.
One note: that duality is the main cause of invoicing errors in the region. A correct invoice template, prepared once, removes that risk entirely.
The threshold changes everything
Five points to know about registration.
Below the threshold, registration stays optional.
Above it, it becomes compulsory, and the calculation is made over a rolling period, not over the calendar year.
Crossing it is monitored each month, with a cumulative total.
Registration brings periodic returns, even with no income in the period.
And the exact value of the threshold and how it is calculated are checked with the competent administration or with an accountant.
Registering early can be an advantage
Four situations where early registration is justified.
A large initial investment in equipment, whose paid tax can be recovered.
A client base of companies, which recover the tax themselves and for whom the total makes no difference.
Rapid growth, which would make crossing the threshold mid-year unmanageable.
And the wish to have one single invoicing rule, rather than two different periods in the same year.
Conversely, a beginning, occasional activity aimed at private individuals rarely has an interest in registering before the obligation.
The client outside Quebec
Four cases to distinguish.
A client elsewhere in the country falls under another tax regime, and the applicable rate depends on their location.
A client outside the country falls under a different treatment, to be checked according to the nature of the service rendered.
In every case, the client's location has to be requested and kept, because it justifies the treatment applied.
And the same month can therefore carry several different treatments, which makes the invoicing table indispensable.
Two taxes, one invoice
| What appears | Where to find it | Common mistake |
|---|---|---|
| Two registration numbers | On the confirmations received | Showing only one |
| Two separate tax lines | Calculated separately | Adding both into one line |
| The total before and after tax | At the foot of the invoice | Showing only the final total |
What is filed, and how often
The two taxes are filed separately, on a frequency tied to volume. Noting the deadlines at registration avoids late penalties, which cost more than the amount due.
What is confirmed before the first invoice
The thresholds, the assigned frequency and the treatment of out-of-province clients. An accountant established here confirms these, and the written confirmation is kept with the invoices.
The line never to forget
Six compulsory mentions on an invoice, once registered.
Your full details.
Your two registration numbers.
The date and a sequential invoice number.
The description of the service, with the rights granted.
The amount before taxes, then each tax stated separately with its rate.
And the total to be paid, distinct from the amount constituting your income.
One simple check: have your invoice template read once by an accountant, before the first issue. That is one hour which avoids correcting dozens of documents later.
One last marker: in this area everything rests on habits, not on knowledge. A correct invoice template, a separate account for the taxes and a table kept each week are enough to make the whole thing harmless, whatever the size of the activity.
Sources
Checked on 27 August 2026. Thresholds and rates change: where this guide and the official source disagree, the official source is right.
