Short Answer
The tax office automatically changes your designation from Tax Class 1 to Tax Class 4 the moment your non-working spouse registers their living address in Germany. This automated transition routinely results in a significantly higher monthly deduction for the household's primary breadwinner.
What Most Expats Don't Realize
You brought your spouse to Germany and completed their mandatory apartment registration at the local citizen's office. You did not realize the registration software immediately triggered a tax classification reset that split your joint assessment into equal halves. Your next monthly paycheck arrived with a surprise 300 € deduction because the finance authority assumed your newly arrived partner was already matching your salary.
What To Do
- Check the "Lohnsteuerabzug" line item on your electronic payslip to verify your current assigned tax class.
- Open the digital ELSTER portal to request an immediate structural reallocation of your household tax status.
- "Ich möchte meine Steuerklasse von Vier auf Drei ändern, da mein Ehepartner nicht arbeitet." (I want to change my tax class from four to three because my spouse is not working.) — email this explicit request to your local tax office.
The Truth
The system assumes both spouses in Class 4 earn exactly the same income. It is a lazy administrative default that does not care about your actual family budget until you complain.