The purchase price, loan amount, your interest rate, whether you need mortgage insurance, your homeowner's insurance cost, property taxes, and your current monthly debt obligations all factor into your DTI.  

I believe we have approached 5 CPA's or tax preparers in Colorado.

The only money ever requested up front prior to closing is for the appraisal.  

I personally do a cost seg on every single property I buy (This is not tax or legal advice). 

I am looking at my first rental property investment, with the current rates and San Diego pricing cashflow is very hard, so I wonder if I should remove tax property and insurance from my cashflow calculations as they are 100% deductible at some point.

Let's say Taxes are $200/month, and Insurance is $150, and you put $100 in a maintenance reserve.  

There won’t be any taxes and your life will be easier. 

Sure if you need to use opm or buy for tax reasons or believe in appreciation, that´s another story, that´s why we always have to ask ourselves why buy that real estate. 

Otherwise all that taxes will come due in one year, not good.

It´s tax free, take the money.