Planning a Granny Flat - What to Consider?

This is what comes to mind quickly, best you go to a tax advisor

Is there so much to consider tax-wise that it’s worthwhile? We have always done it ourselves until now, but next year with a new building, 2x rentals, possibly photovoltaics, special depreciation, depreciation, small business, child, part-time, parental leave, etc., it would probably be advisable, right?

A second KfW loan is possible.

For the tax, you can declare the apartment, we declared 100k back then, that was 50k KfW and 50k extra loan. Additionally, everything like the outdoor facilities, but only a share of that and your work as a janitor.

Did you list the costs for the granny flat separately in the construction contract or later calculated proportionally via QM numbers?

Thanks

Did you list the costs for the granny flat separately in the construction contract or calculate them later proportionally based on square meters?

Does anyone have experience regarding this?

As I understood it, the tax advisor declared the 100k extra and additionally all costs with 20%. Submitted to the tax office. He explained to me back then that, for example, access paths to the property can also be billed.

But go to the tax advisor.