How to Choose the Right Tax Class in Germany

Tax Class I is the default for single, divorced, or widowed employees without children. Tax Class II provides relief for single parents through the Entlastungsbetrag — an additional allowance of €4,260 per year for the first child plus €240 for each subsequent child. Tax Class III and V are designed for married couples with significantly different incomes, while Tax Class IV is the default for married couples with similar earnings. Tax Class VI is reserved for second or secondary jobs and carries the highest withholding rate because no personal allowances or deductions are applied.

The practical impact of tax class on monthly net pay can be substantial. At a gross salary of €60,000, a single employee in Tax Class I takes home roughly €2,950 per month after all deductions. The same gross salary under Tax Class III yields approximately €3,350 per month — a difference of around €400 monthly, or €4,800 annually, in cash flow. This is purely a timing difference: the total annual tax is identical after filing, but the monthly liquidity advantage is real and meaningful for household budgets.

Married couples often face the choice between a III/V combination and a IV/IV combination. The III/V combo maximizes the monthly net pay of the higher earner by assigning them the favorable Class III, but this often leads to an underpayment of taxes and requires a mandatory tax return, frequently resulting in an end-of-year tax bill. IV/IV ensures each partner's withholding is closer to their actual liability, reducing the risk of a surprise payment.

Consider a couple where one partner earns €80,000 and the other earns €30,000. Under III/V, the higher earner's monthly withholding drops significantly, but the lower earner's withholding in Class V is disproportionately high — often leaving very little net pay on their payslip. The combined household net is typically higher month-to-month under III/V, but the annual tax return frequently reveals an underpayment of €2,000–€5,000 that must be settled in a lump sum. Couples who prefer predictable cash flow and want to avoid mandatory filings generally find IV/IV simpler and less risky.

You can change your tax class multiple times a year by applying to your local Finanzamt (tax office) or using the ELSTER online portal. Since 2023, both spouses must submit a joint application for any class change — unilateral switches are no longer permitted. Switching can be particularly beneficial after major life events such as marriage, the birth of a child, or a significant change in income distribution between partners.

A strategic switch is especially relevant when planning for parental leave (Elterngeld). The parental allowance is calculated based on the average net income of the twelve months before the child's birth. By switching to Tax Class III well in advance — ideally seven months before the expected due date — the higher-earning parent can increase their reference net income and thereby receive a higher Elterngeld payment, up to the maximum of €1,800 per month. This planning technique is entirely legal and widely recommended by tax advisors.

Since 2010, married couples have access to a third option: Tax Class IV with a factor (IV-Faktor). Under this method, both partners remain in Class IV, but the Finanzamt calculates a personal factor that distributes the expected joint tax liability more accurately across both payslips. The factor accounts for the income ratio between partners, so the higher earner pays proportionally more each month and the lower earner pays proportionally less — without the extreme imbalance of III/V.

The factor method combines the best of both approaches: monthly withholding closely matches the actual annual tax liability, so there is rarely a large year-end payment or refund. Both partners see a realistic net figure on their payslip each month, which is fairer and more transparent. Despite these advantages, the factor method remains underused — many payroll departments and even tax advisors default to recommending III/V or IV/IV simply because the factor method requires an additional calculation step. Couples with dual incomes of different sizes should actively request IV-Faktor from their Finanzamt; it is usually the optimal choice.