House loan tax deduction: how does it work and how is it shared?

Hi all,

So we purchased on house this year, and will have to fill the house loan tax deduction paper work next February. We just received the paper from the bank indicating the loan amount etc. However, I'm a bit wondering how the tax deduction work, I didn't find relevant info for a couple of point. Anyone could give enlight me?

– Does the tax deduction from the house loan reduce the maximum deduction you can get from Furusato nozei?
– The loan is on my name/account, but my wife is also listed as debtor (since the loan insurance cover her too and we co-own the house / land). How will the tax deduction be shared? Is it something we can decide when filling the paper work? Or is it based on something like the land/house ownership parts?