@bobcat60, keep absolutely everything for at least 5 years. Any piece of paper you got numbers from for your tax return needs to be kept. I have a separate folder for each of the past five years. In each folder I have a complete copy of each tax return as well as any back up information that may be needed. Even if you file online, I would keep copies of everything for at least five years. Beyond five years, I just shred them very well!