Tax return, how does it work?

I have been training since October and have purchased a laptop especially for the training.

Now I got the tip that I could deduct this from the tax (as well as many more costs for the training).

How exactly does it work?

Am I now making the explanation and how long would it take to get the money if I can sell it?

I have never made such an explanation.

If you do not know it, I would advise you not to do it yourself. Can also go backwards if you accidentally give things wrong.

Use one of these free programs.

With the laptop, you can sell about 50% of it, since it is assumed that you use the other half privately.

Question: what is the monthly payroll tax?

There are not many apprentices who pay wages tax at the beginning of their apprenticeship