Just tell me what you want, and let me as SME figure out how to get you there.
When you're in a high-enough tax bracket (in taxation regimes where such high tax-brackets exist), adding a marginal dollar to your net income becomes impractically expensive for the company, compared to basically anything else the company could offer you.
For some people, in some places, getting an extra $20k/yr tacked onto your net income, would cost your employer more than just, say, hiring you a well-paid full-time personal assistant, with the skills necessary to do enough of your job that you go from "overworked" to "takes off early most days to go play golf."
Googling "personal assistant salary", it looks like the average in the US is ~$50k/year. So a personal assistant would cost more, but it is in the right ballpark where that could be a better choice than that raise if this is the reason for the raise:
> with the skills necessary to do enough of your job that you go from "overworked" to "takes off early most days to go play golf."
Nobody negotiates net. It's not even practical. Your tax situation will depend of the other revenues you might receive on top of your wages and the deductions you are eligible to and your employer doesn't have to know about that.
Which is to say, if you're making USD$100k/yr working for Ericsson in Sweden (where you're in the highest, 52.9%, tax bracket for any marginal income above USD$83k), they're gonna be thinking differently about how to reward you as a high performer, vs if you were making USD$100k/yr at Google in the US (where that salary would instead just have you scraping the top of the 22% tax bracket.)
Google would almost certainly just give you more money — and would likely continue to do that indefinitely, as even the highest US federal tax bracket (37% at USD$600k/yr) isn't too onerous. Ericsson, on the other hand, might already rather offer you something non-monetary and "cheap" for them (e.g. a company car), rather than biting the bullet on a "substantial, productivity-incentivizing" raise (i.e. one that meaningfully increases your net income.)
And that is why precisely why salaries tend to be lower in many European countries (that have these high tax brackets); and why everyone in those countries instead expects / demands / enshrines requirements in law for tons of non-monetary benefits, like long vacations! "Purely salary" and "salary levels off, then tons of non-material benefits" are both Nash equilibria in compensation space; just very different ones.
To begin with, non monetary benefits have to be declared in most European countries and impact your tax rates and are taxed the same way than giving you more money so your whole dodgy reasoning immediately falls apart.
They're trying to get your help in decreasing their tax burden, without explicitly saying that that's what they're doing.
(Dunno why people are so coy about this; tax minimization is not illegal, and companies are totally willing to work with you on it.)