Steuerklasse 3 vs 5 vs 4/4: Which Saves More for Couples in Germany

IV/IV taxes each spouse independently as if single, spreading withholding evenly across both paychecks; III/V shifts the couple's entire tax-free allowance onto the higher earner, front-loading much more of the household's monthly cash flow into their salary while the lower earner's paycheck shrinks sharply, even though the household's real final tax bill is the same either way.

No, and this is the single most common misunderstanding. The household's actual final income tax liability is settled at year-end via the Steuererklärung (tax return) under Ehegattensplitting, joint assessment that applies regardless of which tax class combination you used for monthly withholding. III/V and IV/IV only change how that same total is spread across the year and between the two paychecks, not the amount owed.

Cash flow. If one spouse earns substantially more, III/V puts a lot more of the household's net income into that person's monthly paycheck rather than spreading it evenly, which some couples prefer for budgeting, mortgage-affordability calculations that look at one income, or simply because the higher earner handles most shared expenses. It's a timing and allocation choice, not a tax-saving one.

There's no single official cutoff, but the general guidance from German tax advisors is that couples within roughly 40/60 to 50/50 of each other tend to do better on IV/IV, since it tracks the real liability closely and the two paychecks stay comparably balanced. Once the split moves toward 60/40 or beyond, III/V's cash-flow advantage becomes more noticeable, at the cost of a much smaller paycheck for the lower earner and a mandatory annual return.

Yes: IV/IV with Faktor. The Finanzamt calculates a personalised multiplier based on your expected combined income and applies it to both spouses' Class IV withholding, which tracks the real final liability much more precisely than plain IV/IV while still splitting withholding more evenly than III/V. It requires an application to the Finanzamt (or via Elster) and an estimate of both incomes for the year, but it's increasingly the recommended default for couples who don't want a large year-end bill.

Generally once per calendar year, at your local Finanzamt or via Elster, though certain life events (childbirth, one spouse becoming unemployed, marriage or divorce) can trigger an additional allowed change outside the normal window. The new combination takes effect from the payroll cycle after it's processed, not retroactively.