Tax class 1 applies to single, separated, widowed or divorced employees without children. Note: Even if you are not yet divorced but already have two different places of residence, you must switch to tax class I.
Tax class 2 applies to single, separated, widowed or divorced employees with children.
Tax class 3 can be selected by a person in a marriage. It is particularly useful for the sole earner or for dual earners in a marriage. It is the counterpart to tax class V.
Tax class 4 is assigned automatically if spouses do not switch to classes III and V on their own. It is also the right one if spouses earn a similar amount.
Tax class 5 is the counterpart to tax class III. It can be selected by a person in a marriage. It is useful for the person who brings the (significantly) lower income into the partnership.
Tax class 6 only applies if an employee has two jobs. Tax class VI then applies to the additional income.