Certificate of Coverage (CoC)
What is Certificate of Coverage (CoC)?
A document issued by a home country's social security authority confirming that a worker on assignment abroad remains covered under the home country system, preventing dual social security contributions.
A Certificate of Coverage is essential when an employee is sent to work in a country that has a social security totalization agreement with the home country. Without a CoC, the employee and employer may be required to pay social security contributions in both the home and host countries simultaneously.
The CoC confirms that the worker remains subject to the social security legislation of the home country for the duration of the assignment, typically up to five years depending on the bilateral agreement. Employers must apply for the CoC before the assignment begins or shortly after arrival in the host country.
Failure to obtain a CoC can result in significant financial penalties, retroactive contributions, and compliance risks. Mobility teams should work closely with social security authorities and tax advisors to ensure timely issuance and renewal of certificates.
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Frequently Asked Questions
How does a certificate of coverage work?
A certificate of coverage works by leveraging totalization agreements between two countries. The employer or assignee applies to the home country social security authority for a COC before the assignment begins. Once issued, the certificate is provided to the host country authorities and employer as evidence that the assignee remains covered under home country social security and is exempt from host country contributions.
Why does a certificate of coverage matter for international assignments?
A certificate of coverage matters because without it, assignees may be required to pay social security in both their home and host country, doubling contribution costs for the employer. The certificate also protects the assignee's home country benefit accruals, including retirement and disability coverage. COCs typically apply for up to five years depending on the totalization agreement.
Who is responsible for obtaining a certificate of coverage?
Certificates of coverage are typically obtained by the global mobility team in coordination with Payroll, Tax, and external mobility tax advisors. The employer submits the application to the home country social security authority on behalf of the assignee. Some jurisdictions allow the assignee to apply directly. Most mobility platforms track COC expiry dates alongside immigration and assignment documents.
Related Terms
Social Security Totalization Agreement
A bilateral treaty between two countries that eliminates dual social security taxation and ensures workers qualify for benefits from one, and only one, country's social security system during an assignment.
Immigration Compliance
The process of ensuring that employees working abroad hold the correct visas, work permits, and authorizations required by host country law, and that all documentation remains current.
Shadow Payroll
A payroll run in the host country solely for tax and social security compliance purposes, without actually paying the employee through that payroll. The employee continues to receive their salary via home country payroll.