You should be able to file for a different year. But you need to have whatever Turbotax version for that year to file.

All income is taxable. Unless income is from a sell of a primary residence or from an inheritance. If your income is truly non taxable, then you don't need to d...

There's an algorithm used when calculating how much tax someone should pay. If you were to look at an actual tax chart, you could see the progression/exponentia...