Confused about Taxes situation to get a new mortgage

[Rahul Gupta]

Hello, 

I have filed for an extension for my 2021 tax returns and want to apply for a second mortgage so i was hoping to get an answer if possible. 

My current W2 income does not allow me to get a second mortgage because of the DTI ratio and the only way i can qualify is to use my income from Airbnb.

I had 20k income in 2021 from airbnb, but also had expenses like maintenance and mortgage payments etc of around 15k. 

So, if i want a second mortgage, do i not show the expenses on my tax returns to show the full 20k income?

I am super confused on weather the Banks use the gross or the net income to qualify for mortgage?

I also do not pay a ton of taxes without showing the deductions unnecessarily . Just trying to find the right balance and qualify for the second mortgage.

Thank you