家事按分 sanity check

Hello! I'm doing my blue form in Freee (個人事業) for the first time and want a quick sanity check. I own multiple pieces of property, all connected and all on the same mortgage.

I own just shy of 8000sqm of property. Most of that is 畑 with one 山林 and one 宅地. Most of my house is personal use as is some of the other parts of the 宅地. Still, that leaves like 7500sqm / 8000 sqm ~ > 93% for business use. While true, that seems really high. I think I find it odd because 93% of the area != 93% of the value (the hatake are far cheaper in terms of cost).

Is there something I might be missing here?

Thanks!

EDIT: so it looks like mortgage payments don't apply based on several other sources I checked, so I suppose this is a non-issue. Interest from the mortgage maybe but, in my case, I don't think it's worth the hassle at this time. I don't know why Freee doesn't explicitly mention that on their help pages (at least the ones to which they linked when filling stuff in for the blue form) when other sites do. Maybe it's a language issue on my part.

by rokujuunou