Earlier quoted context omitted.
>Nation-wide solidarity costs little to each person Federal income tax in France is greater than 45%[1]. There's nothing cheap about that. I much prefer the freedom of saving my own money, especially when working in something as lucrative as tech. 1. https://tradingeconomics.com/france/personal-income-tax-rate
This is simply wrong. Income tax percentage depends on how much money you make, and it goes from 0% to 45%. You pay 0% up to 9807€ of income. Anything above that and under 27086€ you pay 14% on it. Then between that and 72617€ you pay 30% on it. And then between that and 153783€ you pay 41% on it. Finally, you pay 45% only if you make more than 153783€ per year and again, only on euros that you earn above this thresh…
However, it is far from the whole story: when you get paid, the employer pays taxes, then the employees pays taxes, and only then, you have your income, which is taxed again.
In the end, you get around half of what your employer pays. It means the "more than 45%" is spot on. It works a bit differently for those who are self employed but the numbers are similar.
It is different for civil servants, and as an associate professor, you are probably one. They are taxed much less, which makes sense since they are paid with tax money.