Short Answer

Performance bonuses are classified as extra income known as Sonstige Bezüge and are automatically withheld at your highest marginal tax rate. Because your baseline tax-free allowance is already fully absorbed by your standard monthly salary, every single euro of your bonus gets hit with maximum deductions.

What Most Expats Don't Realize

You worked extra hours to secure a major end-of-year corporate performance bonus and expected a large financial windfall on your next pay cycle. You didn't know that the automated payroll software looks at that specific high-earning month, mistakenly assumes your annual salary has multiplied into a millionaire bracket, and applies an aggressive tax rate placeholder. You opened your payslip to find nearly half of your hard-earned bonus stripped away, causing a temporary cash loss of 1,200 € in over-withheld monthly wages.

What To Do

  • Check your payslip line items to confirm the bonus is officially marked under the category "Sonstige Bezüge."
  • Open a certified annual tax preparation application at the end of the year to trigger the mandatory annual true-up calculation.
  • "Ich beantrage den Lohnsteuer-Jahresausgleich über meine Einkommensteuererklärung." (I am applying for the annual wage tax adjustment through my income tax return.) — submit this electronic declaration to reclaim the monthly over-withholding back into your bank account.

The Truth

The payroll software is inherently pessimistic. It treats your single bonus month as your permanent financial reality and taxes you accordingly until the year-end reconciliation proves otherwise.