Rented room in a new building, what can be deducted?

You should make a trip to the tax advisor! That may cost a bit, but it should be worth it to you before you get into trouble with the tax office later! I think it very much depends on the contract design (there should be a written rental contract!). Costs for that can also be deducted!

You can actually deduct most of the incurred costs. Construction costs and incidental construction costs (excluding land and incidental costs related to it) in the form of depreciation (AfA) and interest on debt are probably the largest items. Of course, only proportionally, e.g., according to living space.

I do not see an extra loan as necessary. It will also be difficult to separate that.

But as I said, I think a tax advisor wouldn’t be wrong. You don’t have to have it done every year then.

Hello,

in my experience, the loan should be separate so that the interest on it is tax-deductible. If you only take a portion from a total loan, you would be worse off because it is reduced by your equity.

Best regards

That's true, I just find it hard to imagine separating it. Sure, with a multi-family house it's no problem, but individual rooms? You'd just have to talk to the bank about it.