Expertise & Services

Once a cross-border element in an employment relationship is introduced, an assessment should take place to determine the (legal) consequences.

Examples of cross-border elements are:

  • Recruitment from abroad
  • Moving to another country
  • Place of residence abroad
  • Nationality of another state
  • Working from home from abroad
  • Working temporarily or permanently from abroad
  • A posting in another state
  • Ancillary activities or a second job abroad

It is also important that this is identified in time (preferably before the fact occurs). If not done in time this will lead to compliance issues. Fixing this will costs a capacity and resources.

Examples of the possible consequences of late identification:

  • The employee is no longer eligible for the 30%-ruling
  • An employee loses the right to the 30%-ruling
  • The employee suddenly will have a lower net-income because of foreign wage tax levies
  • Penalties are imposed by the labor inspectorate for violation of the Posted Workers directive or foreign workers act
  • An employee turns out to be uninsured and has to pay back medical costs
  • The employer appears to have to pay employer contributions premiums abroad which are way higher than expected
  • The employee turns out not to be entitled to an unemployment benefit or disability benefit
  • Wage costs suddenly turns out to be 30% higher than calculated due to differences in contributions and administrative costs
  • Dutch dismissal law suddenly appears not to applicable because the employee ‘usually’ works outside the Netherlands

SOFI-expertise’s aim is in the first place to develop and secure knowledge that helps you to identify the elements that can lead to above-mentioned issues. In addition, we offer services that can assist the participants in the execution of time-consuming, risky and complex processes involving international mobile employees.

Expertise Center

Knowledge development and information

Access to our knowledge base at ‘’ with a source of up-to-date information on cross-border working, FAQ’s and a reference library for our target group.

Monthly newsletter with current events.

The opportunity to contact one of our specialists about cross-border employment issues.

Participate in various expert platforms of colleagues and fellow specialists of other participants.

Training & Development:

Every year we offer a broad scope of training in the fields of (among other):

  • 30%-ruling & extra territorial costs
  • Compensations & Benefits in International Perspective
  • International Social Security
  • International Taxation
  • International Labor Law and the EU Posting and Enforcement Directive
  • Illness, incapacity for work, dismissal and unemployment ‘across the border’

In short: by participating as an organization, you can always fall back on the available knowledge of the network that you are part of and thereby guarantee the knowledge of your internal specialists.

Services and Advice

30% service center

Swift, correct and expert handling of applications for the 30%-ruling. With a team of 12 experts, we process more than 90% of all 30%-ruling applications from expats employed at universities every year.. As a result, we have an enormous wealth of knowledge and experience in applying this tax facility to academic teaching or research staff and the special conditions to our sector.

Help desk

In addition to the fact that SOFI-expertise focuses its activities on (further) developing the knowledge of its participants, SOFI-expertise has a team that can help the employer determine on applicable legislation. We can also help the participant in obtaining an answer from the tax authorities on tax and social security issue in individual employees’ cases. If necessary, we can also help the employer to find an external party that can supports the employer with its compliance in the other state.

Furthermore, we have specialists who can advise on applicable labor law (including the Posted Workers Directive), immigration laws and the effects of cross-border work on social insurance and pensions (unemployment, retirement, survivors, disability and sickness).