Is Zillow tax estimate any good?

[Hersh M.]

I was trying to analyze a property in Fort Worth, Texas.

I looked up the taxes on Zillow as well as on the county assessor site. The 2 are very different for 2012. One is about $2000 and the other is about $3000.

For 2014, the values from the 2 sites are pretty close.

Has anyone else seen this before? I will ofcorse go with county site info but just wanted to make sure i am looking in the right places.