Canadian and foreign suppliers have less than one week to register for QST (Qubec Sales Tax)

Non-Québec resident Canadian suppliers have until September 1 to register under the new specified registration system for Québec sales tax (QST) purposes. Foreign suppliers registered for goods and services tax (GST) purposes are also subject to the September 1 deadline to register in accordance with the new QST specified registration system.

Source EY