Though we think that Biden's tax plan will be a success, the reality is that there are still many holes that need to be closed. I don't know how much tax rates they managed to get from an uperclass like the multi billionaire mentioned above, but it's pretty bad considering they can get away with it easily, and I'm sure there's still a lot that we don't know and don't disclose to the public, imo.
Biden's tax plan will take the wealth away from the upper middle class and distribute it among the poor. The rich are not going to get affected, because they almost never sell their assets and take loans against the assets to cover the monthly expenses. In the end, the rich and the poor are happy about the Biden tax plan, while the middle class get royally screwed. The rise in corporate tax means that almost all the commodities and essentials will become costlier. Also, families with one or two children are at a disadvantage, as the new tax plan favors those who have a dozen or so children.
And don't forget where Biden (just like the Republicans) got their enormous campaign contributions. From the super-rich. He will go easy on them and largely burden the richer in the middle class, because why should the Democrats hurt themselves by alienating their best donors.