If you're a partner, you're either getting profit distributions that are taxed at ordinary income rates, or you're getting dividends that are taxed lower, but the corporation paid 35% tax on profits (plus state), which makes it much worse than just ordinary income rates.

The only real ways I'm aware of to get taxes much lower is capital gains, or perhaps real estate where depreciation "losses" defer a lot of taxes on your income.

But neither of those would really be available for partners in a law firm or medical practice.

So again, please elaborate on how partners get taxed at 20%?