Save them for at least seven years. We save ours a lot longer than that. We see people here all the time who did not save their tax returns or important tax documents, and then they are frantic to find them because they are needed to apply for a loan, student financial aid, etc.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**