Tax records should be kept year-round, not hastily assembled
just for your annual tax appointment. Without tax records, you can lose
valuable deductions or have unsubstantiated items disallowed if you're audited.
Generally, returns can be
audited up to three years after filing. However, if income is underreported by
more than 25 percent, the IRS can collect underpaid taxes up to six years
later. In other words, you need good records to verify what you report on your
tax return, and you should hang on to those records for seven years