Hi, I'm just wondering why Turbo Tax used 1040A instead of 1040EZ for my 2016 taxes. I have used Turbo Tax or about 10 years.

I made 42k in 2016 and 52k in 2015. Now I owe 500$, and I don't understand why and how to avoid it. I'm worried it will happen again for my 2017 taxes.