Offer your thoughts or opinion on the input financial query or topic using your financial background.

Cash flow implications of converting primary mortgaged residence to rental
You are assuming 100% occupancy and 100% rent collection.  This is unrealistic.  You could get lucky and find that long term tenant with great credit that always pays their bills... but in reality that person usually buys a home they do not rent long term.  So you will need to be prepared for periods of no renters and periods of non payment.  The expenses here I would expect could wipe out more than you can make in "profit" based on your numbers. Have you checked to find out what the insurance on a rental property is?  I am guessing it will go up probably 200-500 a year possibly more depending on coverage.  You will need a different type of insurance for rental property. Have you checked with your mortgage provider to make sure that you can convert to a rental property?   Some mortgages (mine is one) restrict the use of the home from being a rental property.  You may be required to refinance your home which could cost you more, in addition if you are under water it will be hard to find a new financier willing to write that mortgage with anything like reasonable terms. You are correct you would be taking on a new expense in rental.  It is non deductible, and the IRS knows this well.   As Littleadv's answer stated you can deduct some expenses from your rental property. I am not sure that you will have a net wash or loss when you add those expenses.  If you do then you have a problem since you have a business losing money.  This does not even address the headaches that come with being a landlord. By my quick calculations if you want to break even your rental property should be about 2175/Month. This accounts for 80% occupancy and 80% rental payment.  If you get better than that you should make a bit of a profit... dont worry im sure the house will find a way to reclaim it.