@Cliff Harrison Correct my numbers if I have calculated anything incorrectly:
$925 - Rent
($115) - heloc
($240) - 1st mortgage
($100) - taxes
($74) - vacancy, based on your 8%
($93) - property management estimated 10% of rent. Depending on your area, some PMs may also charge you first month's rent or 1/2 of first month's rent when a tenant moves in, so you'll need to factor that as well.
(??) - insurance - fill in your number
($95) - repairs - I'll throw in 10% for general repair and tenant turnover
($95) - capex - 10% is probably a fair estimate, pay attention to the age of your systems and the remaining life - roof, hvac, hot water, carpet, kitchen appliances, kitchen and bath age, etc.
I come up to $812 but don't know insurance in your area. You have to decide the cashflow you are willing to accept, given that once you tie up the $$ from your heloc, it will not be available to deploy on a future deal.
As has been mentioned, assume that landscaping, snow, utilities, etc are tenant responsibilities.
Do get an umbrella insurance policy. For the money, everyone should have one.
Are you buying the property at a discount?
Be sure to get recommendations from local investors on property managers. The first property manager I ever used had a provision in their contract that they could make repairs up to $500 without pre-approval. They reasoned that an emergency may occur and they can not wait to get in touch with me. Not knowing any better, I went along with it. Tenant moved in and I received my first monthly statement. They did about $400 in useless repairs - replacing carpet transitions, etc. I later found out that they owned the repair company. It was a long year, so learn from my mistake on the property management.
Good luck to you.