How about realizing that when you use the current property taxes of a property you are buying to calculate your per door profit that the following year your taxes will reset to what YOU paid for the property and will likely significantly increase your tax expense - which can take you from a positive cash flow to a negative cash flow on a low cash flow property… now you are paying your tenants to live in the property every month out of your W2 income  hoping for an appreciation play until rents hopefully increase.I could go on and on.  

Quote from @Levi Perl: Hi,Curious if anyone has what to say in terms of how to calculate which one is more worth it: to cash out refi on a Long term rental now at 70% LTV, and walk away with X amount of positive cash AFTER paying all debt, (X is a positive number and significant amount for me), which will allow me to potential get another long term rental and grow portfolio faster, or wait 4 months and cash out 80% LTV, giving me DOUBLE than X. 

Your IRA custodian should have advised you by now and calculated the amount for you.

If you can show that someone else has paid the loan on-time for 12 consecutive months you can exclude that debt from the debt to income calculation.

BiggerPockets also has a calculator to analyze deals, and I highly recommend you start this as soon as possible, even if you are not ready to buy.

Here's a bit more in detail about how rates are calculated for DSCR loans:1.

The rent is calculated from the zillow estimates.

Make sure to also include in your calculation all the associated costs of those homes (maintenance, cap-x, management, vacancy, etc) then include the selling cost of the home since the appreciation isn't unlocked until you sell the home.

BP calculator does it, its an estimate but works8. 

When calculating that into your analysis you’ll see that can eat up your profit real quick.