What is a CAO?
A CAO (Collectieve Arbeidsovereenkomst, collective labour agreement) is a written agreement negotiated between one or more employer organisations and trade unions that sets binding minimum employment terms for a defined group of employees. CAOs cover wages, working hours, holiday allowance, pension contributions, sick pay, training, and dismissal protection, and they override any less favourable individual contract clauses.
Roughly 80 percent of Dutch employees are covered by a CAO. For employers navigating multiple sectoral agreements, Octagon's HR consultancy services provide CAO interpretation, scaling reviews, and compliance health checks.
How does a CAO work?
A CAO is concluded between recognised employer associations such as AWVN or VNO-NCW and trade unions such as FNV and CNV. The agreement is registered with the Ministry of Social Affairs and Employment, which can declare it universally binding through an AVV (Algemeen Verbindend Verklaring), extending its scope to every employer in the sector.
Employers within scope must apply the CAO to all qualifying employees. Individual contract clauses that fall below the CAO minimum are void and automatically replaced by the CAO provision. After expiry, terms continue to apply to existing employees until a successor CAO is agreed. For practical implementation, see our CAO compliance checklist and the explainer on AVV mandatory extension.
Who does a CAO apply to?
A CAO applies to employees of any company that is a member of the signatory employer organisation, to every employer in a sector covered by an AVV declaration, and to any employee whose contract incorporates the CAO by reference. Major sectoral CAOs include Metalektro for engineering, Horeca for hospitality, Bouw and Infra for construction, Detailhandel for retail, and the umbrella ABU CAO for temporary agency work. Foreign companies operating Dutch payrolls are equally bound.
A company-specific CAO can also be negotiated, common in larger employers such as ING, ASML, or KLM, which then replaces or supplements the sectoral standard.
When does a CAO not apply?
A CAO does not apply when the employer falls outside the signatory association and no AVV declaration extends its scope, when the employee is a statutory director with a management agreement, or when the worker is a genuine self-employed contractor outside the scope of employment law. CAOs also do not bind workers posted to the Netherlands under the EU Posted Workers Directive beyond the core hard-nucleus terms such as minimum wage and working time. For dismissal-related interactions between CAO and statute, see our Dutch dismissal law guide.