Like any tool, you have to know how to use it correctly or you could get, "injured".We use it to quickly sift through multiple options - and that's about it.BP has a Rental Calculator that includeds everything you are asking about: mortgage P&I, property taqxes, home insurance and percentage for maintenance & vacancy.It also includes Cap-Ex percentage, but in our experience it's a waste of time to worry about this.

Regarding DTI - mortgage industry will alllow around 40%, but tenants tend to pay a higher percentage of their income to rent/housing than homeowners.

I was wondering if anyone has a suggestion as to how to go about it.

If the bill is $100 a month split between four units, increase it to $120 and charge each tenant $30.How to calculate charges.

@Stacy Tring, Kudos to you for those calculations. 

I have recently just purchased my 4th investment property all in my name and have accumulated a DTI of 45.9%.

 One of the 3 adults has a high DTI, what about the other two?

Since you're planning to rent the condo in 1-2 years, a lower rate could also mean better cash flow once you transition to being a landlord.

How much will you have to spend to make those units worth more to the renter?

Hi,Is there any BP provided calculator which can provide a report as to how a existing rental property which was purchased say few years ago has performed in terms of ROI, Cash flow etc till date and whether its worthwhile to continue to keep in future.