Do I need to keep past years Turbo Tax programs on my computer so that I can complete this year's tax return?

[barmat]

I have Turbo Tax programs for every year since 2007 loaded on my computer.  That's taking up memory.  I know the current year tax program looks back to my tax information for past years.  Does it look back beyond the most recent past year.  I will be doing by 2016 income tax soon using Turbo Tax.  How many past years do I need on my computer to do the 2016 taxes.

[MR_ED · Accepted solution]

I go back a lot futher than that but I only keep the last 3 years on my computer. To do the 2016 return, I had only 2013, 2014, and 2015 on my computer. If any year has something that I may need such as depreciation or sales of property, I might keep important pages but I don't tie up memory with old returns.