"Well how would people pay it?"
That depends what the tax is, doesn't it? Which nobody knows.
At the moment you might be paying Council Tax (which is a bit like a sort of property tax) which might amount to 0.5% of the market value of your house. Though if you are very rich, and live in a very big house in a very expensive area, it might be considerably less.
Some would say that very rich people paying lower rates of tax than poorer people is not a very good idea. Others disagree.
Maybe a system will be devised that results in everybody paying an amount that averages around 0.4%. Many people would be quite content with that. Others would disagree. maybe it will be calculated in some different way.
Maybe a tax will be chosen that is based on something which is costly to value, of debatable worth, and can be hidden or moved overseas. I can think of reasons why that would be less suitable.
As yet, any changes to personal taxation are nobbut a twinkle in Rishi's eye, though doubtless Cummings has some strong ideas. Whatever gets proposed will be intended to get another Conservative government returned, and perhaps Rishi will be the next PM unless Cummings acts quickly to depose him.
The changes will not be decided by an opposition party.