Residential / Usable Area Calculation for Tax Office

Hello,

The tax office wants from me, as part of the "Erklärung zur Feststellung des Einheitswerts," a calculation of the living/usable area for my newly converted apartment.
The calculation itself is not the problem, I think. There are a few things to watch out for, but it is doable.
The question is rather, in which "form" does the tax office want these calculations? The results in the form of the area probably are not enough, the tax office wants the "calculation" - what is that supposed to look like?
Regards
N

Living area: sqm full floor plus sqm between 1 and 2 meters height plus balcony/terrace plus usable area. ?.

Yes, as I said, I understand HOW the calculation is to be done. The question is in what "form" the tax office wants to see this calculation. Submit a scrap of paper full of side calculations? I can give them the final result, but they want the "calculation"...

A scratch paper is a form. If you think it is the right form, then start scribbling. The other thing is the calculation. And that is precisely an addition of a calculation: X x Y = z + etc. Bottom line = ab This is a calculation! You can also write it clearly, without scribbling. Maybe even type it out....

The question is in which "form" the tax office wants to see this calculation.

I have received a list from my general contractor. I think the tax office wants something like that.

It looks similar to the one in the attached picture.

If you enter "Wohnflächenberechnung Formular" into the Google search engine, you will get numerous templates.

Thank you, that helps me.
:)