Working across borders raises many questions: where should you pay taxes, how about social security, and what obligations do employers have? NeD Tax recognises these issues and provides clear answers. 
The 183-day rule is a tax treaty provision and determines which country can levy tax. While it may seem simple at first, it can be quite complicated in practice. Proper advice is essential to clarify the consequences of working abroad.  
When working in multiple countries, you are usually considered socially insured in the country where you do most of your work. A salary split can be beneficial from a fiscal point of view, but it requires careful fine-tuning to avoid double charges or conflicts with social security rules. 
Working in another country, or even two countries, can affect your pension accrual and your right to a mortgage interest deduction. In some cases, you may lose your right to deduct, but there are solutions involving a qualifying foreign tax liability or compensation scheme. 
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