Big stuff that gets me to my $90k annual savings goal swiftly.

The main issue I would have with the number is the Maintenance number. 

for the extra cash you keep for maintenance and capex issues that might come up unexpectedly.

GRM is purchase price divided by gross rent.Ex - I just purchased a property for 102,900 and the gross annual rent is 21,600.

@Daniel Kim one fourth their due for each four years = an annual return of .25/4 or about  6.25%then just plug that into a retirement calculator that calculates contributions and compound interest for 20 years

Can you provide the following:- Purchase price- NOI- Gross rents- Insurance- Tax- Maintenance/repair cost- Property management cost- Vacancy 

The other beef I have is with the annual inspections, where they often find nuisance items for me to address. 

That's a current ROI of 0.01%.If I wanted to underwrite as loose as possible and ignore the management expense allocation and capex allocation, I could get to a 2.69% current return and a 6.63% annual earned ROI. 

I fix the houses, manage the rentals, arrange for sales, track all maintenance and rehab expenses.

Minimum your rent increase should match your state annual cost of living index.In fast appreciating markets 3-5% annual rent increases are common but you must know your local markets.