A ruling involving Tata Consultancy Services has confirmed that a long-term secondment to the Netherlands can, by itself, create a Dutch employment relationship — a result that directly touches how HR structures international assignments and where payroll, dismissal protection and collective obligations sit.

The case, analyzed by law firm Osborne Clarke under the headline "Long-term secondments can become Dutch employment: key takeaways from the Tata Consultancy Services ruling," turned on the question of whether an employee posted to work in the Netherlands for an extended period acquired local employment status despite the underlying contract sitting elsewhere.

The court's answer was yes. That single finding matters for any multinational with staff seconded into Dutch operations on open-ended or multi-year terms.

What does the ruling change?

The core takeaway from the TCS decision is that the label on an assignment does not control the legal outcome. A secondment agreement drafted under another jurisdiction — with a home-country employer of record — can still ripen into Dutch employment once the posting runs long enough and the work is genuinely embedded in the Dutch operation.

For HR, that shifts the question from "what does the contract say?" to "what does the working reality look like?" Osborne Clarke's takeaways point employment counsel and people teams toward the substance of the arrangement: duration, the place where work is performed, and the degree of integration into the local business.

The practical consequence is that an employer can end up with obligations it never priced into the assignment — Dutch statutory protections, Dutch dismissal rules and Dutch payroll treatment among them.

Why is duration the trigger?

The ruling's logic, as Osborne Clarke frames it, is that time compounds. A short posting reads as a temporary arrangement. A long-term secondment, where the employee keeps working in the Netherlands indefinitely or for years, starts to look like ordinary local employment regardless of the paperwork.

That gives HR a concrete due-diligence task: audit the current secondment population and flag every assignment into the Netherlands that has run, or is planned to run, beyond its originally temporary frame. Each flagged case carries the risk that Dutch employment has already attached.

The exposure isn't theoretical for large users of cross-border staffing. Tata Consultancy Services is one of the world's biggest IT services employers, and businesses of that scale routinely rotate hundreds of staff through client sites in jurisdictions like the Netherlands. One adverse finding against a secondment-heavy employer signals a broader compliance question for the entire IT-services and consulting sector that staffs Dutch projects this way.

What should employers do now?

For multinationals with Dutch secondments, the ruling suggests a set of immediate checks:

• Map every employee currently seconded into the Netherlands, with start dates and intended end dates, and identify assignments that have drifted past their original term.
• Review whether secondment agreements state a genuine, fixed end point — or whether they roll forward in practice, which is the pattern courts read as local employment.
• Ask employment counsel whether the working reality — reporting lines, client integration, place of performance — matches the contract's home-country framing.
• Model the cost if Dutch employment status attaches: local payroll, benefits, dismissal protection and any collective agreement coverage.
• Decide, before renewal, whether to formalize a Dutch employment contract for long-term staff rather than leave the question to litigation.

The employer-side argument that won't work, on this ruling, is pointing at the secondment label itself. Duration and substance carried the analysis.

Who should be watching this?

The immediate audience is legal and HR leadership at companies that post workers into the Netherlands from India, the UK, the US or elsewhere in the EU — the classic TCS-style staffing model for client engagements. But the principle travels. Any jurisdiction with employee-protective tests that look past contract labels can reach the same result, and Dutch courts' willingness to find local employment from working reality is a pattern multinational HR teams already track.

Compensation and mobility teams should also take note. If a secondment converts into Dutch employment, assignment packages built around home-country salary structures may no longer comply, and retroactive claims become a live risk. The cleanest fix, on Osborne Clarke's takeaways, is structural: keep secondments genuinely temporary, or convert them deliberately.

The ruling leaves open how courts will treat borderline durations case by case. What it settles is the headline: in the Netherlands, a long-term secondment can be Dutch employment, and employers that ignore that will meet the question in court rather than in planning.