I'd be ok if they simply enforced existing tax laws the same on them as they do on us. People making millions should be paying 40% (all taxes combined) of their income just like the rest of us. Get rid of all the weird loopholes and oversea havens. Actually do something about the panama papers instead of just forgetting about it.
They also should move up the income tax brackets to give us middle class people some relief on inflation. In some places you need to be making like 6 figures just to be able to have an average house, and making that much puts you in a very high tax bracket even though by the time all the bills come out, you're not rich at all.
Also should be possible to write off living expenses. We should only pay taxes on our profit left over after all the bills come out, like a company. That would give a huge relief.