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LegalExpert answer · 2 min read

What do I need to register after buying a business in Quebec?

After buying a business in Quebec, check three registers: the Registraire des entreprises (its 30-day update rule), Revenu Québec’s GST and QST files, and the CNESST, which an employer must tell about a sale or acquisition.

No single filing covers a Quebec business purchase. The new owner deals with three bodies, each under its own rules: the Registraire des entreprises, which keeps the enterprise register, Revenu Québec, which runs the GST and QST files, and the CNESST, the workplace health, safety and labour-standards body. The sections below say what each body’s own pages state. Which of them applies depends on the facts, such as whether the business is registered and whether it has workers. This covers Quebec only. It is general information, and the broader steps of a purchase are in buying a business in Quebec.

The enterprise register and the 30-day update

When the Registraire registers an enterprise, it assigns a Quebec enterprise number (NEQ), which the enterprise uses to identify itself to the Registraire and to other government bodies. The Registraire’s pages say that a registered enterprise must update its information within 30 days of a change. Every registered enterprise must also file an annual update, whether or not anything changed. If the business you bought is registered, ask how the purchase changes what the register shows and who now files.

GST and QST registration

Revenu Québec says that, in general, a person must register in the GST and QST files if they carry on commercial activities in Quebec. Its page also refers to its small-supplier rules, which can change whether registration is required, and lists activities that require registration regardless of sales. Whether the seller’s registration carries over to you, or you need your own, is a question for Revenu Québec or an accountant. Read its page on the sale of a business before closing; it describes a joint election a seller and buyer can make, if the conditions it lists are met, so that GST and QST do not apply to the sale.

Reporting to the CNESST

The CNESST requires an employer to register if it hires at least one worker, full time or part time, and has an establishment in Quebec, or hires a self-employed worker whom the CNESST considers a worker. It also says that when a sale, merger or acquisition occurs, the employer must report the change to the CNESST. When you take over another employer’s activities, you could inherit its insurance file and its pay equity obligations. The CNESST adds that claims for amounts due under the Act respecting labour standards that were not settled before the change are not cancelled, and the former and new owners are solidarily liable for them; the former owner cannot be held liable for claims arising from events after the sale. Ask the seller for the insurance file and any pay equity records before closing.

Sources

This answer is checked against primary sources. Links were last confirmed on the dates shown.

  1. 01
    Gouvernement du Québec (Registraire des entreprises)Government
    Obligations légales liées à l’immatriculation d’une entreprise
    quebec.ca·Checked Oct 25, 2026
  2. 02
    Gouvernement du Québec (Registraire des entreprises)Government
    Mettre à jour des renseignements figurant au registre des entreprises
    quebec.ca·Checked Oct 25, 2026
  3. 03
    Gouvernement du Québec (Registraire des entreprises)Government
    À propos de l’immatriculation d’une entreprise
    quebec.ca·Checked Oct 25, 2026
  4. 04
    Revenu Québec (copie de l’Internet Archive du 6 juillet 2026)Government
    Inscription aux fichiers de la TPS et de la TVQ
    web.archive.org·Checked Oct 25, 2026
  5. 05
    Revenu Québec (copie de l’Internet Archive du 16 octobre 2025)Government
    Vente d’une entreprise
    web.archive.org·Checked Oct 25, 2026
  6. 06
    CNESSTRegulator
    S’inscrire à la CNESST
    cnesst.gouv.qc.ca·Checked Oct 24, 2026
  7. 07
    Commission des normes, de l’équité, de la santé et de la sécurité du travail (CNESST)Regulator
    Vente, fusion ou acquisition d’une entreprise
    cnesst.gouv.qc.ca·Checked Oct 25, 2026
  8. 08
    Commission des normes, de l’équité, de la santé et de la sécurité du travail (CNESST)Regulator
    Reprise des activités d’un autre employeur
    cnesst.gouv.qc.ca·Checked Oct 25, 2026

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