1) I pay 70% tax on any income I earn over 10 million. The tax on the rest of my income stays the same.
2) As soon as my income crosses 10 M threshold, all my income is taxed at 70%.
The first is the real proposal - “marginal” rate.
In contrast, a 70% rate on total income would operate as a punishment. It would also be nearly impossible to implement or police.
But the high marginal rate would operate just as it did when we previously had it - ushering in an era of greater dignity and advancement for the working person in America.