Estimating Property Taxes in Texas

[Gil Estupinan]

Hey Bigger Pockets!!

Looking at purchasing a turnkey property in Rowlett Texas and I was wondering how best to estimate property taxes from my analysis. 

Example:  If the historical assessed price of the property is $100K and the purchase price is $150K would should I use as the post purchase assessment value? 

I guess as a worst case scenario I can use the tax percentage from the county records and multiply that against the purchase price...but I'm being told that is not how it works in Texas.  

Any insight would be greatly appreciated.

Thanks!

Gil