Then just look at current rates and 30 year fixed payments and that’ll give you a rough idea  So if I understand you correctly, If my business income is 45k and my rental income is 18k...45,000 + 18,000 = 63,000 63,000 x .40 = 25,200So my maximum PITI (principal, interest, tax, insurance) payments on all my properties can't exceed $25,200 per year?

I was pre-approved for a loan and with all the interest, insurance, and principal the loan will be about 2250 a month.

.$95,000.005 years$2,000 a monthShould I request some equity percentage like 50% when the sale happens or cash out refinance to pay back the principal in 5 years which ever happens.

The benefit I can think of is that I'm getting a much lower rate because it's my primary house, the cons is that I'm taking a big loan, and even it has lower rate, the principal is much higher.My current interest will be 560K (rate of 3) + 150K (rate of 5, if I put 140K down), if I do cash out refin, it would be (850K rate of 3.75)Any suggestion is appreciated!

Principal amount and interest is not accurate and is substantially lower than presented.

If you have another strategy, maybe if you are trying to reduce your taxable income by taking passive losses, while still getting principal paydown and equity build up through appreciation, that is a whole other topic... but from a purely basic investment standpoint, you want to at least get 1% if possible. 

Here is the breakdown: Principal: $201,026PITI: $1,537.55Principal and interest$1,102.41Property insurance$122.30County tax$312.84Fixed Interest at 5.125%I have the concept of 10% down and a high interest rate, in saying, how could i structure this deal to make sense for me, but I also do not want to charge them an insanely high rate.

My assumption is that when you say "Mortgage Payment," you are including PMI, Taxes, Insurance, Principal and Interest, correct?

. $200 a month, multiplied by 12 months = $2,400 $2,400 multiplied by 4 years = $9,600We can use the $9,600 to buy another duplex once she graduates and makes income again.The goal is to use duplex income to pay off all of her student loans.Our deal analysis is just like how BP teaches:Cash flow has to be >$200 a unit after ALL expenses and Cash on Cash return has to be >12%Expenses-Principal & Interest-Property Taxes-PMI-Home Insurance-Water/Sewer-Garbage-Vacancy 5%-12%-Repairs & Maintenance 5%-10%-Capital Expenditures 5%-1-%-Management fees 0% (I will manage all of our properties now & moving forward)We are 3 weeks in on the Duplex search in New Haven we are learning QUICK that cash flow and a FHA loan do NOT get along.

At the end of 2nd year, principal returned would be $35917.46Total cash received after 24 months, assuming all goes well is $44980.10Decent return and allows me to get my feet wet.