Did you get hit with a big tax bill this year that you weren’t expecting? If so, you are not alone. Changes in the tax laws and the housing market have had homeowners’ tax bills going up and down all over the place lately. The Gwinnett County tax assessor has to take all of these things and more into consideration when determining your bill. Let’s take a look at what things can cause tax bills to go up, and what you can do about it.