Hi,

I work part-time for the EU company and use a payroll service to pay taxes and social deductions.
I was surprised that the tax in my latest salary statement was doubled. The payroll company explained to me that they have to tax me like I'm working for 100%. Since they do not know if I'm working anywhere else.

"If the employer does not know the employee’s total degree of employment, the wage for the rate-determining income is calculated on the basis of a degree of employment of 100%."

Does anyone have the same case? Is there any option how to pay withholding tax based on my real income?