The tax on overtime depends directly on your tax class. Contrary to a common misconception, tax class 1 (single) and tax class 4 (married, both partners with similar income) use exactly the same income tax schedule. The monthly income tax deduction – and therefore the overtime net payout – is identical in both tax classes for the same gross amount.
Note on class 3: The lower income tax deduction in tax class 3 is not a permanent tax advantage – it only shifts the deductions to the spouse in tax class 5. Under the joint income tax return, the actual tax burden is calculated for both partners together via spousal income splitting.
Important: The base wage for the overtime hour is taxed as regular employment income under the progressive tax principle. Current law provides for §3b surcharges for night, Sunday and public holiday work, which remain tax-free. A draft bill additionally proposes making surcharges for extra work beyond the full-time threshold (40 hrs/week, 34 hrs under a collective agreement) tax-free up to 25% of the base wage – but as of July 2026 this rule is not yet in force. Overtime surcharges would remain subject to social security contributions even under the draft; §3b surcharges, by contrast, are also contribution-free up to a base wage of €25/hour (§ 1 SvEV).