What are your expenses for you property? What am I missing?

[Charles Kennedy]

Hi BP Community! 

I'm in the process of analyzing some deals and would like to ask current owners what sort of operating expenses they have? I know their is taxes, insurance, landscaping (if not doing it yourself), pest control (I suppose I could have tenant cover this one), and utlities (will definitely pass this on to the tenant). What are other recurring monthly operating expenses are there? 

I realize I should account for basic repairs like sinks/toilets/etc. 

Finally, unrelated, but what system do you use to collect rent from your tenants?