Definition and synonyms of poor from the online English dictionary from Macmillan Publishers Limited.
See IRS Publication 552, Recordkeeping for Individuals, for more information. Six Years. If you may have under-reported income by 25 percent or more, then you'll need to keep tax returns and all related information for six years.
Keep records for 7 years if you file a claim for a loss from worthless securities or bad debt deduction. (IRS.gov) So to play it safe, and assuming most people are not tax fraudsters, keep all your tax related records for 7 years. I use old shoe boxes stored in my basement to keep tax records related to a certain year.