What are Social Security Contributions?
Social security contributions, known in Dutch as sociale premies, are the mandatory payments that fund the Dutch welfare system. They split into two categories. National insurance premiums (volksverzekeringen) cover AOW state pension, Anw survivor benefit, and Wlz long-term care, and are paid by the employee as part of loonheffing. Employee insurance premiums (werknemersverzekeringen) cover WW unemployment, WIA and WAO disability, and ZW sickness, and are paid by the employer on top of gross salary. A separate income-dependent Zvw healthcare contribution applies to both sides.
For foreign companies budgeting Dutch roles through Octagon's Employer of Record services, social security contributions are the largest employer cost line after gross salary and must be modelled before finalising any offer.
How do Social Security Contributions work?
Employers calculate each premium against the employee's premium wage (premieloon), capped at the annual maximum daily wage published by UWV. The employer withholds the employee portion through loonheffing, adds the employer-side premiums, and remits the total via the monthly loonaangifte to the Belastingdienst. Premium rates differ by sector, by contract type (permanent contracts attract a lower AWf rate than flexible contracts under the WAB), and by the employer's individual WIA risk score, which UWV recalculates each year.
For a detailed breakdown of 2026 percentages and caps, see employer social charges 2026 and the full EOR vs entity analysis for the Netherlands.
Who do Social Security Contributions apply to?
Social security contributions apply to every employee on a Dutch payroll, including permanent, fixed-term, part-time, and EOR-employed staff. They apply to directors under the fictitious employment rules and to most cross-border workers whose social security coverage is allocated to the Netherlands under EU Regulation 883/2004. An A1 certificate from another member state can keep the employee on the home-country scheme during a posting, in which case Dutch premiums do not apply during the covered period.
When do Social Security Contributions not apply?
Social security contributions do not apply to genuine self-employed contractors, who pay their own income tax and arrange private insurance for disability and pension. They do not apply where an A1 certificate assigns coverage to another EU or treaty state. Employees who have reached the AOW pension age of 67 stop paying the AOW component, although employer premiums for WW and WIA continue on post-retirement earnings. For expats using the 30% ruling, premiums are still calculated on the full gross base, as explained in the 2025 30% ruling update.