On my pay slip I see that money is deducted. Is that correct?
Sometimes money is deducted from the net earnings.
These are the so-called net deductions. An example of net deductions is when the employer provides you with accommodation and deducts the rent from your wages.
Some deductions are not legally permitted. Furthermore, your employer may only deduct money from your net earnings if your net earnings are not below a certain amount: the garnishment limit. The level of the garnishment limit depends on how much you earn and how many people you have to support (see the garnishment table at the following link: PDF.js viewer (verbraucherzentrale.de)).
It's best to always get advice when you see deductions on your pay slip!