[ElQuapo]

This would be a cool feature, but it could also end up making things unrealistic depending on how it is implemented.

Let's say we have a tax-rate of 50% in Denmark and 30% in the USA. There is still the question of what "bonuses" this tax-rate offers. For example things like free-healthcare, free-education etc.

A player who makes a ton of money would obviously make more money on the bottom with a low tax-rate, even though he would have to have private health-insurance and pay for his childrens school etc.

But the less amount of money the player makes, the less this becomes apparent. Minor league players might actually make more on the bottom in countries with higher tax-rates, as their salary would not be high enough to easily pay privately for the "bonuses" that are provided via tax in countries with tax-funded welfare.

Or to put it in mathematical terms, anyone who makes more than X is better off paying a low tax rate, while anyone who makes less than X is better off paying a high tax rate (with X being dependent on the level of tax-funded welfare being provided in different countries).

It's probably to complex to model, but simply letting players prefer a low-tax rate would be unrealistic for these reasons.