Steuerklassen Explained: Why Married Couples Argue About Tax Class III vs. V

Germany's six Lohnsteuerklassen (wage tax classes) determine how much income tax gets withheld from your paycheck each month — but here's the detail that confuses almost everyone new to the system: your tax class has no effect on your actual annual tax bill. That's fixed by Germany's progressive tax rates on your total income, full stop. What your Steuerklasse changes is your monthly cash flow — any gap between what was withheld and what you actually owed gets settled at Steuererklärung time.

Single people default to Klasse I. Single parents get Klasse II, which includes a modest additional tax relief (Entlastungsbetrag für Alleinerziehende) that Klasse I doesn't. If you take on a second job alongside your main one, that second job's income generally falls into Klasse VI, which withholds at a notably higher rate — expected, since it assumes no tax-free allowance has already been used elsewhere.

Marriage is where it gets genuinely relevant. As soon as you marry (and live together), the Finanzamt automatically assigns both of you Klasse IV — appropriate when both partners earn similar incomes, since it withholds roughly proportionally from each paycheck.

If one partner earns significantly more than the other — roughly 60% or more of the household income is the commonly cited threshold — switching to the III/V combination can make sense: the higher earner takes Klasse III (lower withholding, bigger paycheck now), the lower earner gets Klasse V (higher withholding). The catch: choosing III/V makes filing a joint Steuererklärung every year mandatory, not optional, specifically to true up what was actually owed.

There's a third option worth knowing about: Klasse IV mit Faktor, which applies a personalized adjustment factor to each partner's Klasse IV withholding so that what's taken out monthly tracks your actual expected annual tax liability much more closely than either IV/IV or III/V manage on their own — fewer surprises either way at tax time, at the cost of a slightly more involved application.

You can switch combinations more than once a year if your circumstances change — a pay raise, a partner going part-time, a new job — so it's worth revisiting periodically rather than treating your original choice as permanent. A widely discussed plan to abolish III/V entirely in favor of IV with Factor for everyone starting in 2030 was seriously proposed but never became law, so as of 2026 the III/V option is still very much available if it fits your situation.