Tax classes (Steuerklassen) decide how much salary tax you pay. There are 6 tax classes (Steuerklassen) in Germany. Your tax class depends on your situation.

If you are self-employed, you probably don't have a tax class.

Tax classDescription
IPeople who are not in category II, III or IV. Most single people are in tax class 1.
IISingle parents who raise children alone.
IIIIf you are married, and your spouse is in tax class V.
IVMarried couples when both spouses work.
VIf you are married, and your spouse is in tax class III.
VIWorker who receives a wage from multiple employers. You pay much more income tax.

If you don't have a tax ID yet, your employer will put you in this tax class.