If possible, you could keep one or two past years. It's...

Do I delete old versions of the TurboTax software on my computer

I have been using TurboTax for years, Do I delete all the old versions of the program on my computer?

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If possible, you could keep one or two past years. It's possible you might need them to double check something you entered last year, or to respond to a question from the IRS. As computer systems evolve, it can sometimes be troublesome to reinstall older software.