I used (total rental per yr) - (total interest) - (total cost) then divide by how many name per properties.

Kena audit twice already. No problem.

But i split calculation per property. According to my accountant friend he said can just lump sum all rental and expenses accross different property

Thats what my bro told me. He handling all properties in family business.

The last time i kena audit i included every bill paid related to the property like roof repair, pipe, and indah water. I categorized clearly which is which and all receipt ready. They no ask anything about else and lepas me.