Proving my rental income so I can use it on debt to income ratio?

[Asher Anthes]

Hi guys here's my current situation:

I've had my first house for almost a year, I have friends that rent from me (boarders income I believe it's called, because I live in the house myself?).

Not factoring utilities my gross rental income is $1350 per month, PITI is $866, a net of $484 monthly.

My salary is $3000 a month

I also have approx $500 of side business profit per month (probably won't apply to my debt to income ratio).

I also have about $280 a month of student loans.

So, my question is, how can I use my rental income to let the bank give me a loan for a second house? They say I maxed out on my debt to income ratio, but I'm really taking home a lot more money at the end of each month than when I got approved for my first mortgage.

I've heard something about the bank allowing you to borrow extra if you have history landlording properties. Do I have to wait for 2 years tax return history to get this benefit?

Thanks for your help!