Econ 101 opinion here, so I'm ignoring totally reasonable things like "people work for reasons other than monetary compensation" and assuming you're a rational participant in the economy, but I'd say there is no percentage at which you'd do that.
No matter how high a percentage is taken, you can always increase the topline number to make the bottom line number come out ahead of not working. I'd take a 99% tax on $1 billion/year over $14k/year in social insurance taxed at 0% if it were offered.
Anyway, isn't this similar to what the comp of people implementing something you might call automation is already doing in US tech hubs? We've had relatively low inflation in the US over the past decade (by CPI, anyway) but I can find you an article by Joel Spolsky from the aughts lamenting the fact that some tech companies were paying top new grads nearly $100k a year.
Huh? If I were getting, I don't know, 200k a year, for free, I'd probably quit.
Of course there is a level where that vast majority of people would simply not work anymore.
Rich people do this literally all the time. It's called "retirement".
Tax the wealthiest 0.01% at 99% and watch how fast they leave the country for low tax regions.
It already happens with people like the Facebook cofounder that renounced US citizenship.
Because that is where the action and the talent is. It's not just about money and cost of living.
Also the 0.01 are so absurdly wealthy many are pledging to give away their money. They are not going to move away from their homeland because they are taxed more.