Foreign Posted Workers on Canadian Sites: Certificate Checks

The A1 certificate is a European document and has no Canadian form. The Canadian counterpart is the certificate of coverage issued under an international social security agreement, which confirms that a worker sent temporarily to another country stays under one country's pension plan. Checking the documents of a foreign worker on a Canadian construction site therefore means comparing four sources: the certificate of coverage from the sending country, the worker's identity and work-permit documents, the employment contract, and payroll records. Each can be valid on its own and still fail the comparison: a certificate that ends before the project does, an employer name that differs from the contract, a worker on site who is not on the roster. This article describes what each check compares and what the reviewer does next. It does not claim that a check proves a document is authentic.

Rules are described as of 5 November 2026 and change; confirm them with the agencies linked. This is general information, not legal advice.

What does a certificate of coverage establish in Canada?

A certificate of coverage confirms that the worker stays covered by one country's pension plan and is exempt from the other country's social security rules. The Canada Revenue Agency describes this for Canadian employers sending staff abroad: the employer requests the certificate for a worker going to a country that has a social security agreement with Canada, and the request assumes the employee returns to the Canadian job (CRA, who can apply). Employers based in Quebec apply through Retraite Québec rather than the CRA (Revenu Québec).

Those pages describe the outbound route. For a worker coming into Canada, the document is issued by the sending country's institution under the agreement concerned; the reviewer reads the agreement and the certificate itself, and asks the issuing institution when something does not match. No federal "posting declaration" equivalent to the European prior notification was verified for this article, and provincial rules differ, so we make no claim about one.

What does each document prove, and what does it not?

Each document answers one question, and none replaces the others.

Which fields should be compared?

Seven comparisons catch most mismatches on a Canadian site.

A spelling variant and an expired certificate do not carry the same weight. Log the gap, the answer and the access decision each time.

How long can a temporary assignment last?

The maximum period depends on the agreement, so there is no single figure. The CRA gives the example of a detachment to the United States, where a certificate can run up to 60 months, and notes that under the Canada–US agreement a certificate is generally unnecessary for stays of 183 days or less unless the other country asks for one (same CRA pages). Other agreements differ. The cross-check that matters is cumulative time on Canadian projects, successive sites included, against the period printed on the certificate.

What does a mismatch look like in practice?

A typical case is a certificate whose period ends mid-project. The certificate runs to the end of March, the schedule runs to the end of June. Nothing suggests forgery; there is a gap. The reviewer records it, asks the employer to obtain an extension from the issuing institution, and reads the agreement's maximum period before promising anything. Until the new certificate arrives, the subcontract should say from which date access stops, so the answer does not depend on who happens to be at the gate.

A second case is a headcount gap: the subcontract names twelve workers, the access log shows fourteen. The two extra people are held at the gate, the employer is asked for their certificates and permits, and the date and answer are logged. It is an open item with a deadline, not an accusation.

What do site managers actually ask?

"Does the certificate let someone start work?" No. It addresses pension coverage only. The work permit and the site credentials are separate checks.

"The certificate arrives after the worker has started. Now what?" Log the delay, request the document and decide internally whether access continues in the meantime. Put the cut-off date in the subcontract so the decision is not improvised on site.

"Is a photo of the certificate on a phone enough?" It is enough to start the comparison, not to close it. Ask for the original file and keep it with the roster entry.

Where does automation help?

On a project with several subcontractors the table above becomes dozens of comparisons per company. A document-validation tool compares names, birth dates, employer and validity dates across the documents in one file and flags the gaps, with a log of what was checked and when. It shows where documents disagree; it does not say whether a document is genuine. Identity documents are personal information: federal PIPEDA and provincial laws (Loi 25 in Quebec) govern how you collect and keep them, as the Office of the Privacy Commissioner explains.

The construction solution page explains what CheckFile compares in a subcontractor file; see also security and pricing.

Related reading: subcontractor compliance documents in construction and the industry verification guide.

Frequently Asked Questions

Is there a Canadian version of the A1 certificate?

The closest equivalent is the certificate of coverage under an international social security agreement. It plays the same role for pension coverage, but each agreement has its own terms and limits.

Can a contractor reject a certificate it finds suspicious?

It cannot invalidate a foreign certificate itself. It can record the mismatch, ask the employer for an explanation or a corrected document, and take legal advice if the doubt remains.

Who issues the certificate for a Quebec employer?

Retraite Québec, through its social security agreements office, rather than the CRA, according to Revenu Québec's guidance for Quebec-based employers sending staff abroad.

What should be compared first?

Name and date of birth on the certificate against the passport, then the employer against the contract, then the validity period against the project schedule.

Does an automated check prove a document is genuine?

No. It compares fields across documents and flags inconsistencies; authenticity rests with the institution that issued the document.