2015 1040 why 1040A 2016

Why 2015 I used 1040 and this year turbotax used 1040A

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TurboTax' decision which form to file depends on your specific circumstances each tax year.

The 1040-EZ is limited in which tax situations it can handle. The 1040A can handle a bit more. And if there's something the 1040A doesn't include, then you'll file a 1040. It's the IRS who decides which details can go on which forms, and it's TurboTax' job to apply the IRS rules.

One year you might file a particular form, and then the next year a different one.