@Paul De Luca had a good idea otherwise maybe it is worth check with a tax attorney to see if they have any good ideas or websites that pull all of that data.  

The rates for our loans for investors including DSCR loans, Fix-n-Flip Loans, and Ground-Up Spec Construction (as well as the rates for consumer Conventional, FHA, VA, and USDA rates) are driven by Treasury Rates as opposed to the Fed Funds rate, but there is a loose connection.

I'm interested in knowing where you are getting your data from to project a healthy ROI opportunity for your Real Estate Investment. 

One of them could get hit by a bus tomorrow....That's 33% of your data.

When purchasing income property there will be two sets of pro forma: one set using current (actual) data, and one set using new (projected) data.

You can make it your own with Zillow or other looking at the sold data.

In other words, the only way to move forward is to share sensitive data before you can even speak to someone?  

This site will also give you neighborhood data such at school ratings and other info. 

There are lots of benefits - buying, selling commission, access to the MLS, access to better data, access to contracts and addendums, access to your broker for knowledge, the list goes on and on.

@Karthik NatarajanProps to you for doing your due diligence.In many areas, assessment amounts are adjusted upon sale of the property so it is NOT unusual and in fact it is quite common for property taxes to increase significantly for a new buyer.Absent any other data, I’d trust the calculator.You could also call the County Tax Collector or Asssesor to verify the information.Good luck.Arn