One of the best audit tips available can be summed up in one simple word. Match.
Spend a minute or two pretending you work for the IRS. What would you do to identify tax returns worth auditing? If you suggest matching filed tax returns with the information provided to you about that taxpayer from other sources you would be right on the mark. The IRS runs an automated matching program that kicks out mismatches and helps identify audit targets without much effort on their part. Knowing this: