On the same 65.000 € gross, a worker takes home roughly € 588 more per year in Austria than in Germany. That gap reflects the tax structure alone — before rent, healthcare, or savings behaviour come into play.
Housing is the first multiplier. Germany has moderate rent pressure, while Austria has moderate 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. Germany runs a public healthcare model — Statutory health insurance (~14.6% split with employer) gives full coverage. Austria uses a universal model — Statutory health insurance covers nearly all care. 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 comprehensive welfare state in Germany against comprehensive welfare state in Austria, plus differences in pension capture, social safety nets, and city-level cost of living.