On the same € 65.000 gross, a worker takes home roughly CHF 27'892 more per year in Switzerland than in Netherlands. That gap reflects the tax structure alone — before rent, healthcare, or savings behaviour come into play.
Housing is the first multiplier. Switzerland has very high rent pressure, while Netherlands has very high rent pressure. The two markets behave similarly, so most of the gross-to-net advantage flows straight into disposable income.
Healthcare and pensions go in the opposite direction. Switzerland runs a public healthcare model — Mandatory private health insurance (~CHF 350+/month) outside payroll. Netherlands uses a public model — Mandatory private health insurance (~€140/month) with regulated coverage. The country with lower take-home often shifts costs that the other country leaves to your private budget.
Net-of-everything, a relocation decision should weigh basic public welfare in Switzerland against comprehensive welfare state in Netherlands, plus differences in pension capture, social safety nets, and city-level cost of living.