No, you don't, not unless your income is about half a million EUR.

42% is the marginal tax rate (and 45% above 250k). The effective tax rate only exceeds 30% above ca. 71k EUR.

When you’re Selbstandig and not Freierberuf, there is also Gewerbesteuer. Depends on the location one has the Gewerbe registered. NRW being the most expensive one. Yup, taxes are progressive but one reaches that level.