Tax rates differ between individuals, based on other income, membership in a religion (specific to Germany), marital status, etc. It’s the same reason retail p

Tax rates differ between individuals, based on other income, membership in a religion (specific to Germany), marital status, etc. It’s the same reason retail prices I’m the US are often stated without sales taxes, a practice that is rare or even illegal in other jurisdictions: taxes sometimes differ even between cities, and it is impossible to state a single value for anything but a specific store.